878 lines
23 KiB
JavaScript
878 lines
23 KiB
JavaScript
// @license magnet:?xt=urn:btih:d3d9a9a6595521f9666a5e94cc830dab83b65699&dn=expat.txt Expat
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// @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL
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/**
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* Copyright (c) 2014 Leonardo Cardoso (http://leocardz.com)
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* Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
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* and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
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*
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* Restructured by Rabzuarus (https://friendica.kommune4.de/profile/rabuzarus)
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* to use it in the decentralized social network Friendica (https://friendi.ca).
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*
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* Version: 1.4.0
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*/
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(function ($) {
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$.fn.linkPreview = function (options) {
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var opts = jQuery.extend({}, $.fn.linkPreview.defaults, options);
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var id = $(this).attr('id');
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var previewTpl = '\
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<div id="preview_' + id + '" class="preview {0}">\
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{1}\
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<input type="hidden" name="has_attachment" id="hasAttachment_' + id + '" value="{2}" />\
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<input type="hidden" name="attachment_url" id="attachmentUrl_' + id + '" value="{3}" />\
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<input type="hidden" name="attachment_type" id="attachmentType_' + id + '" value="{4}" />\
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</div>';
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var attachmentTpl = '\
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<hr class="previewseparator">\
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<div id="closePreview_' + id + '" title="Remove" class="closePreview" >\
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<button type="button" class="previewActionBtn">×</button>\
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</div>\
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<div id="previewImages_' + id + '" class="previewImages">\
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<div id="previewImgBtn_' + id + '" class="previewImgBtn">\
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<button type="button" id="previewChangeImg_' + id + '" class="buttonChangeDeactive previewActionBtn" style="display: none">\
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<i class="fa fa-exchange" aria-hidden="true"></i>\
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</button>\
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</div>\
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<div id="previewImage_' + id + '" class="previewImage">\
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</div>\
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<input type="hidden" id="photoNumber_' + id + '" class="photoNumber" value="0" />\
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<input type="hidden" name="attachment_img_src" id="attachmentImageSrc_' + id + '" value="" />\
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<input type="hidden" name="attachment_img_width" id="attachmentImageWidth_' + id + '" value="0" />\
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<input type="hidden" name="attachment_img_height" id="attachmentImageHeight_' + id + '" value="0" />\
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</div>\
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<div id="previewContent_' + id + '" class="previewContent">\
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<h4 id="previewTitle_' + id + '" class="previewTitle"></h4>\
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<blockquote id="previewDescription_' + id + '" class="previewDescription"></blockquote>\
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<div id="hiddenDescription_' + id + '" class="hiddenDescription"></div>\
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<sup id="previewUrl_' + id + '" class="previewUrl"></sup>\
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</div>\
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<div class="clear"></div>\
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<hr class="previewseparator">';
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var text;
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var binurl;
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var block = false;
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var blockTitle = false;
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var blockDescription = false;
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var cache = {};
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var images = "";
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var isExtern = false;
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var photoNumber = 0;
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var firstPosted = false;
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var isActive = false;
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var isCrawling = false;
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var defaultTitle = opts.defaultTitle;
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var defaultDescription = opts.defaultDescription;
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/**
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* Initialize the plugin
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*
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* @returns {void}
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*/
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var init = function() {
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$('#' + id).bind({
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paste: function () {
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setTimeout(function () {
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crawlText();
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}, 100);
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},
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keyup: function (e) {
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// on enter, space, ctrl
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if ((e.which === 13 || e.which === 32 || e.which === 17)) {
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crawlText();
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}
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}
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});
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// Check if we have already attachment bbcode in the textarea
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// and add it to the attachment preview.
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var content = $('#' + id).val();
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addBBCodeToPreview(content);
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};
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/**
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* Reset some values.
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*
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* @returns {void}
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*/
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var resetPreview = function() {
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$('#hasAttachment_' + id).val(0);
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photoNumber = 0;
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images = "";
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};
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/**
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* Crawl a text string if it contains an url and try
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* to attach it.
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*
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* If no text is passed to crawlText() we take
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* the previous word before the cursor of the textarea.
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*
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* @param {string} text (optional)
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* @returns {void}
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*/
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var crawlText = function (text) {
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block = false;
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images = '';
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isExtern = false;
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// If no text is passed to crawlText() we
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// take the previous word before the cursor.
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if (typeof text === 'undefined') {
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text = getPrevWord(id);
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} else {
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isExtern = true;
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}
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// Don't procces the textarea input if we have already
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// an attachment preview.
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if (!isExtern && isActive) {
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return;
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}
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if (trim(text) !== "" && block === false && urlRegex.test(text)) {
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binurl = bin2hex(text);
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block = true;
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isCrawling = true;
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$('#profile-rotator').show();
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if (binurl in cache) {
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isCrawling = false;
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processContentData(cache[binurl]);
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} else {
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getContentData(binurl, processContentData);
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}
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}
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};
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/**
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* Process the attachment data according to
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* its content type (image, audio, video, attachment)
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*
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* @param {object} result
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* @returns {void}
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*/
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var processContentData = function(result) {
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if (result.contentType === 'image') {
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insertImage(result.data);
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}
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if (result.contentType === 'audio') {
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insertAudio(result.data);
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}
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if (result.contentType === 'video') {
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insertVideo(result.data);
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}
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if (result.contentType === 'attachment') {
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insertAttachment(result.data);
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}
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$('#profile-rotator').hide();
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};
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/**
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* Fetch the content of link which should be attached.
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*
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* @param {string} binurl Link which should be attached as hexadecimal string.
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* @param {type} callback
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* @returns {void}
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*/
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var getContentData = function(binurl, callback) {
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$.get('parse_url?binurl='+ binurl + '&format=json', function (answer) {
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obj = sanitizeInputData(answer);
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// Put the data into a cache
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cache[binurl] = obj;
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callback(obj);
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isCrawling = false;
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});
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};
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/*
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* Add a [img] bbtag with the image url to the jot editor.
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*
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* @param {type} data
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* @returns {void}
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*/
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var insertImage = function(data) {
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if (!isExtern) {
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return;
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}
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var bbcode = '\n[img]' + data.url + '[/img]\n';
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addeditortext(bbcode);
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};
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/*
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* Add a [audio] bbtag with the audio url to the jot editor.
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*
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* @param {type} data
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* @returns {void}
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*/
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var insertAudio = function(data) {
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if (!isExtern) {
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return;
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}
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var bbcode = '\n[audio]' + data.url + '[/audio]\n';
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addeditortext(bbcode);
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};
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/*
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* Add a [video] bbtag with the video url to the jot editor.
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*
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* @param {type} data
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* @returns {void}
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*/
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var insertVideo = function(data) {
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if (!isExtern) {
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return;
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}
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var bbcode = '\n[video]' + data.url + '[/video]\n';
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addeditortext(bbcode);
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};
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/**
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* Proccess all attachment data and show up a html
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* attachment preview.
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*
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* @param {obj} data Attachment data.
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* @returns {void}
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*/
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var insertAttachment = function(data) {
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// If we have already a preview, leaver here.
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// Note: if we finish the Preview of other media content type,
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// we can move this condition to the beggining of crawlText();
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if (isActive) {
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$('#profile-rotator').hide();
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return;
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}
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if (data.type !== 'link' && data.type !== 'video' && data.type !== 'photo' || data.url === data.title) {
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$('#profile-rotator').hide();
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return;
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}
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$('#photoNumber_' + id).val(0);
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resetPreview();
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processAttachmentTpl(data, 'type-' + data.type);
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addTitleDescription(data);
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addHostToAttachment(data.url);
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addImagesToAttachment(data.images);
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processEventListener();
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$('#profile-rotator').hide();
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};
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/**
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* Construct the attachment html from the attachment template and
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* add it to the DOM.
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*
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* @param {object} data Attachment data.
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* @returns {void}
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*/
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var processAttachmentTpl = function(data) {
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// Load and add the template if it isn't allready loaded.
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if ($('#preview_' + id).length === 0) {
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var tpl = previewTpl.format(
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'type-' + data.type,
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attachmentTpl,
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1,
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bin2hex(data.url),
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data.type
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);
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$('#' + id).after(tpl);
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}
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isActive = true;
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};
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/**
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* Add the attachment title and the description
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* to the attachment preview.
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*
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* @param {object} data Attachment data.
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* @returns {void}
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*/
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var addTitleDescription = function(data) {
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var description = data.text;
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if (description === '') {
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description = defaultDescription;
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}
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$('#previewTitle_' + id).html("\
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<span id='previewSpanTitle_" + id + "' class='previewSpanTitle' >" + escapeHTML(data.title) + "</span>\
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<input type='text' name='attachment_title' value='" + escapeHTML(data.title) + "' id='previewInputTitle_" + id + "' class='previewInputTitle inputPreview' style='display: none;'/>"
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);
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$('#previewDescription_' + id).html("\
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<span id='previewSpanDescription_" + id + "' class='previewSpanDescription' >" + escapeHTML(description) + "</span>\n\
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<textarea id='previewInputDescription_" + id + "' name='attachment_text' class='previewInputDescription' style='display: none;' class='inputPreview' >" + escapeHTML(data.text) + "</textarea>"
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);
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};
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/**
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* Add the host to the attachment preview.
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*
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* @param {string} url The url of the link attachment.
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* @returns {void}
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*/
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var addHostToAttachment = function(url) {
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if (url) {
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var regexpr = "(https?://)([^:^/]*)(:\\d*)?(.*)?";
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var regResult = url.match(regexpr);
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var urlHost = regResult[1] + regResult[2];
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$('#previewUrl_' + id).html("<a href='" + url + "'>" + urlHost + "</a>");
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}
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};
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/**
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* Add preview images to the attachment.
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*
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* @param {array} images
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*
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* @returns {void}
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*/
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var addImagesToAttachment = function(images) {
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var imageClass = 'attachment-preview';
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if (Array.isArray(images)) {
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$('#previewImages_' + id).show();
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$('#attachmentImageSrc_' + id).val(bin2hex(images[photoNumber].src));
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$('#attachmentImageWidth_' + id).val(images[photoNumber].width);
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$('#attachmentImageHeight_' + id).val(images[photoNumber].height);
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} else {
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$('#previewImages_' + id).hide();
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}
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images.length = parseInt(images.length);
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var appendImage = "";
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for (i = 0; i < images.length; i++) {
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// For small preview images we use a smaller attachment format.
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///@todo here we need to add a check for !Config::get('system', 'always_show_preview').
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if (images[i].width >= 500 && images[i].width >= images[i].height) {
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imageClass = 'attachment-image';
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}
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if (i === 0) {
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appendImage += "<img id='imagePreview_" + id + "_" + i + "' src='" + images[i].src + "' class='" + imageClass + "' ></img>";
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} else {
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appendImage += "<img id='imagePreview_" + id + "_" + i + "' src='" + images[i].src + "' class='" + imageClass + "' style='display: none;'></img>";
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}
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}
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$('#previewImage_' + id).html(appendImage + "<div id='whiteImage' style='color: transparent; display:none;'>...</div>");
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// More than just one image.
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if (images.length > 1) {
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// Enable the the button to change the preview pictures.
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$('#previewChangeImg_' + id).show();
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if (firstPosted === false) {
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firstPosted = true;
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$('#previewChangeImg_' + id).unbind('click').click(function (e) {
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e.stopPropagation();
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if (images.length > 1) {
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$('#imagePreview_' + id + '_' + photoNumber).css({
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'display': 'none'
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});
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photoNumber += 1;
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// If have reached the last image, begin with the first image.
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if (photoNumber === images.length) {
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photoNumber = 0;
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}
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$('#imagePreview_' + id + '_' + photoNumber).css({
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'display': 'block'
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});
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$('#photoNumber_' + id).val(photoNumber);
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$('#attachmentImageSrc_' + id).val(bin2hex(images[photoNumber].src));
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$('#attachmentImageWidth_' + id).val(images[photoNumber].width);
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$('#attachmentImageHeight_' + id).val(images[photoNumber].height);
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}
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});
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}
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}
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};
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/**
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* Add event listener to control the attachment preview.
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*
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* @returns {void}
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*/
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var processEventListener = function() {
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$('#previewSpanTitle_' + id).unbind('click').click(function (e) {
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e.stopPropagation();
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if (blockTitle === false) {
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blockTitle = true;
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$('#previewSpanTitle_' + id).hide();
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$('#previewInputTitle_' + id).show();
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$('#previewInputTitle_' + id).val($('#previewInputTitle_' + id).val());
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$('#previewInputTitle_' + id).focus().select();
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}
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});
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$('#previewInputTitle_' + id).blur(function () {
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blockTitle = false;
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$('#previewSpanTitle_' + id).html($('#previewInputTitle_' + id).val());
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$('#previewSpanTitle_' + id).show();
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$('#previewInputTitle_' + id).hide();
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});
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$('#previewInputTitle_' + id).keypress(function (e) {
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if (e.which === 13) {
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blockTitle = false;
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$('#previewSpanTitle_' + id).html($('#previewInputTitle_' + id).val());
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$('#previewSpanTitle_' + id).show();
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$('#previewInputTitle_' + id).hide();
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}
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});
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$('#previewSpanDescription_' + id).unbind('click').click(function (e) {
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e.stopPropagation();
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if (blockDescription === false) {
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blockDescription = true;
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$('#previewSpanDescription_' + id).hide();
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$('#previewInputDescription_' + id).show();
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$('#previewInputDescription_' + id).val($('#previewInputDescription_' + id).val());
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$('#previewInputDescription_' + id).focus().select();
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}
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});
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$('#previewInputDescription_' + id).blur(function () {
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blockDescription = false;
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$('#previewSpanDescription_' + id).html($('#previewInputDescription_' + id).val());
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$('#previewSpanDescription_' + id).show();
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$('#previewInputDescription_' + id).hide();
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});
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$('#previewInputDescription_' + id).keypress(function (e) {
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if (e.which === 13) {
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blockDescription = false;
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$('#previewSpanDescription_' + id).html($('#previewInputDescription_' + id).val());
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$('#previewSpanDescription_' + id).show();
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$('#previewInputDescription_' + id).hide();
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}
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});
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$('#previewSpanTitle_' + id).mouseover(function () {
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$('#previewSpanTitle_' + id).css({
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"background-color": "#ff9"
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});
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});
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$('#previewSpanTitle_' + id).mouseout(function () {
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$('#previewSpanTitle_' + id).css({
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"background-color": "transparent"
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});
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});
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$('#previewSpanDescription_' + id).mouseover(function () {
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$('#previewSpanDescription_' + id).css({
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"background-color": "#ff9"
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});
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});
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$('#previewSpanDescription_' + id).mouseout(function () {
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$('#previewSpanDescription_' + id).css({
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"background-color": "transparent"
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});
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});
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$('#closePreview_' + id).unbind('click').click(function (e) {
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e.stopPropagation();
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block = false;
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images = '';
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isActive = false;
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firstPosted = false;
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$('#preview_' + id).fadeOut("fast", function () {
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$('#preview_' + id).remove();
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$('#profile-rotator').hide();
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$('#' + id).focus();
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});
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});
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};
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/**
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* Convert attachmant bbcode into an array.
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*
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* @param {string} content Text content with the attachment bbcode.
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* @returns {object || null}
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*/
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var getAttachmentData = function(content) {
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var data = {};
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var match = content.match(/([\s\S]*)\[attachment([\s\S]*?)\]([\s\S]*?)\[\/attachment\]([\s\S]*)/im);
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if (match === null || match.length < 5) {
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return null;
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}
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var attributes = match[2];
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data.text = trim(match[1]);
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var type = '';
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var matches = attributes.match(/type='([\s\S]*?)'/im);
|
||
if (matches !== null && typeof matches[1] !== 'undefined') {
|
||
type = matches[1].toLowerCase();
|
||
}
|
||
|
||
matches = attributes.match(/type="([\s\S]*?)"/im);
|
||
if (matches !== null && typeof matches[1] !== 'undefined') {
|
||
type = matches[1].toLowerCase();
|
||
}
|
||
|
||
if (type === '') {
|
||
return null;
|
||
}
|
||
|
||
if (
|
||
type !== 'link'
|
||
&& type !== 'audio'
|
||
&& type !== 'photo'
|
||
&& type !== 'video')
|
||
{
|
||
return null;
|
||
}
|
||
|
||
if (type !== '') {
|
||
data.type = type;
|
||
}
|
||
|
||
var url = '';
|
||
|
||
matches = attributes.match(/url='([\s\S]*?)'/im);
|
||
if (matches !== null && typeof matches[1] !== 'undefined') {
|
||
url = matches[1].toLowerCase();
|
||
}
|
||
|
||
matches = attributes.match(/url="([\s\S]*?)"/im);
|
||
if (matches !== null && typeof matches[1] !== 'undefined') {
|
||
url = matches[1].toLowerCase();
|
||
}
|
||
|
||
if(url !== '') {
|
||
data.url = escapeHTML(url);
|
||
}
|
||
|
||
var title = '';
|
||
|
||
matches = attributes.match(/title='([\s\S]*?)'/im);
|
||
if (matches !== null && typeof matches[1] !== 'undefined') {
|
||
title = matches[1].toLowerCase();
|
||
}
|
||
|
||
matches = attributes.match(/title="([\s\S]*?)"/im);
|
||
if (matches !== null && typeof matches[1] !== 'undefined') {
|
||
title = matches[1].toLowerCase();
|
||
}
|
||
|
||
if (title !== '') {
|
||
data.title = escapeHTML(title);
|
||
}
|
||
|
||
var image = '';
|
||
|
||
matches = attributes.match(/image='([\s\S]*?)'/im);
|
||
if (matches !== null && typeof matches[1] !== 'undefined') {
|
||
image = matches[1].toLowerCase();
|
||
}
|
||
|
||
matches = attributes.match(/image="([\s\S]*?)"/im);
|
||
if (matches !== null && typeof matches[1] !== 'undefined') {
|
||
image = matches[1].toLowerCase();
|
||
}
|
||
|
||
if (image !== '') {
|
||
data.image = escapeHTML(image);
|
||
}
|
||
|
||
var preview = '';
|
||
|
||
matches = attributes.match(/preview='([\s\S]*?)'/im);
|
||
if (matches !== null && typeof matches[1] !== 'undefined') {
|
||
preview = matches[1].toLowerCase();
|
||
}
|
||
|
||
matches = attributes.match(/preview="([\s\S]*?)"/im);
|
||
if (matches !== null && typeof matches[1] !== 'undefined') {
|
||
preview = matches[1].toLowerCase();
|
||
}
|
||
|
||
if (preview !== '') {
|
||
data.preview = escapeHTML(preview);
|
||
}
|
||
|
||
data.text = trim(match[3]);
|
||
data.after = trim(match[4]);
|
||
|
||
return data;
|
||
};
|
||
|
||
/**
|
||
* Process txt content and if it contains attachment bbcode
|
||
* add it to the attachment preview .
|
||
*
|
||
* @param {string} content
|
||
* @returns {void}
|
||
*/
|
||
var addBBCodeToPreview =function(content) {
|
||
var attachmentData = getAttachmentData(content);
|
||
if (attachmentData) {
|
||
reAddAttachment(attachmentData);
|
||
// Remove the attachment bbcode from the textarea.
|
||
var content = content.replace(/\[attachment[\s\S]*\[\/attachment]/im, '');
|
||
$('#' + id).val(content);
|
||
$('#' + id).focus();
|
||
}
|
||
};
|
||
|
||
/**
|
||
* Add an Attachment with data from an old bbcode
|
||
* generated attachment.
|
||
*
|
||
* @param {object} json The attachment data.
|
||
* @returns {void}
|
||
*/
|
||
var reAddAttachment = function(json) {
|
||
if (isActive) {
|
||
$('#profile-rotator').hide();
|
||
return;
|
||
}
|
||
|
||
if (json.type !== 'link' && json.type !== 'video' && json.type !== 'photo' || json.url === json.title) {
|
||
$('#profile-rotator').hide();
|
||
return;
|
||
}
|
||
|
||
var obj = {data: json};
|
||
obj = sanitizeInputData(obj);
|
||
|
||
var data = obj.data;
|
||
|
||
resetPreview();
|
||
|
||
processAttachmentTpl(data);
|
||
addTitleDescription(data);
|
||
addHostToAttachment(data.url);
|
||
|
||
// Since we don't have an array of image data,
|
||
// we need to add the preview images in a different way
|
||
// than in function addImagesToAttachment().
|
||
var imageClass = 'attachment-preview';
|
||
var image = '';
|
||
|
||
if (data.image !== '') {
|
||
imageClass = 'attachment-image';
|
||
image = data.image;
|
||
} else {
|
||
image = data.preview;
|
||
}
|
||
|
||
if (image !== '') {
|
||
var appendImage = "<img id='imagePreview_" + id + "' src='" + image + "' class='" + imageClass + "' ></img>"
|
||
$('#previewImage_' + id).html(appendImage);
|
||
$('#attachmentImageSrc_' + id).val(bin2hex(image));
|
||
|
||
// We need to add the image widht and height when it is
|
||
// loaded.
|
||
$('<img/>' ,{
|
||
load : function(){
|
||
$('#attachmentImageWidth_' + id).val(this.width);
|
||
$('#attachmentImageHeight_' + id).val(this.height);
|
||
},
|
||
src : image
|
||
});
|
||
}
|
||
|
||
processEventListener();
|
||
$('#profile-rotator').hide();
|
||
};
|
||
|
||
/**
|
||
* Add missing default properties to the input data object.
|
||
*
|
||
* @param {object} obj Input data.
|
||
* @returns {object}
|
||
*/
|
||
var sanitizeInputData = function(obj) {
|
||
if (typeof obj.contentType === 'undefined'
|
||
|| obj.contentType === null)
|
||
{
|
||
obj.contentType = "";
|
||
}
|
||
if (typeof obj.data.url === 'undefined'
|
||
|| obj.data.url === null)
|
||
{
|
||
obj.data.url = "";
|
||
}
|
||
if (typeof obj.data.title === 'undefined'
|
||
|| obj.data.title === null
|
||
|| obj.data.title === "")
|
||
{
|
||
obj.data.title = defaultTitle;
|
||
}
|
||
if (typeof obj.data.text === 'undefined'
|
||
|| obj.data.text === null
|
||
|| obj.data.text === "")
|
||
{
|
||
obj.data.text = "";
|
||
}
|
||
if (typeof obj.data.images === 'undefined'
|
||
|| obj.data.images === null)
|
||
{
|
||
obj.data.images = "";
|
||
}
|
||
|
||
if (typeof obj.data.image === 'undefined'
|
||
|| obj.data.image === null)
|
||
{
|
||
obj.data.image = "";
|
||
}
|
||
|
||
if (typeof obj.data.preview === 'undefined'
|
||
|| obj.data.preview === null)
|
||
{
|
||
obj.data.preview = "";
|
||
}
|
||
|
||
return obj;
|
||
};
|
||
|
||
/**
|
||
* Destroy the plugin.
|
||
*
|
||
* @returns {void}
|
||
*/
|
||
var destroy = function() {
|
||
$('#' + id).unbind();
|
||
$('#preview_' + id).remove();
|
||
binurl;
|
||
block = false;
|
||
blockTitle = false;
|
||
blockDescription = false;
|
||
cache = {};
|
||
images = "";
|
||
isExtern = false;
|
||
photoNumber = 0;
|
||
firstPosted = false;
|
||
isActive = false;
|
||
isCrawling = false;
|
||
id = "";
|
||
};
|
||
|
||
var trim = function(str) {
|
||
return str.replace(/^\s+|\s+$/g, "");
|
||
};
|
||
var escapeHTML = function(unsafe_str) {
|
||
return unsafe_str
|
||
.replace(/&/g, '&')
|
||
.replace(/</g, '<')
|
||
.replace(/>/g, '>')
|
||
.replace(/\"/g, '"')
|
||
.replace(/\[/g, '[')
|
||
.replace(/\]/g, ']')
|
||
.replace(/\'/g, '''); // ''' is not valid HTML 4
|
||
};
|
||
|
||
// Initialize LinkPreview
|
||
init();
|
||
|
||
return {
|
||
// make crawlText() accessable from the outside.
|
||
crawlText: function(text) {
|
||
crawlText(text);
|
||
},
|
||
addBBCodeToPreview: function(content) {
|
||
addBBCodeToPreview(content);
|
||
},
|
||
destroy: function() {
|
||
destroy();
|
||
}
|
||
};
|
||
};
|
||
|
||
$.fn.linkPreview.defaults = {
|
||
defaultDescription: "Enter a description",
|
||
defaultTitle: "Enter a title"
|
||
};
|
||
|
||
/**
|
||
* Get in a textarea the previous word before the cursor.
|
||
*
|
||
* @param {object} text Textarea elemet.
|
||
* @param {integer} caretPos Cursor position.
|
||
*
|
||
* @returns {string} Previous word.
|
||
*/
|
||
function returnWord(text, caretPos) {
|
||
var index = text.indexOf(caretPos);
|
||
var preText = text.substring(0, caretPos);
|
||
// If the last charachter is a space or enter remove it
|
||
// We need this in friendica for the url preview.
|
||
var lastChar = preText.slice(-1)
|
||
if ( lastChar === " "
|
||
|| lastChar === "\n"
|
||
|| lastChar === "\r"
|
||
)
|
||
{
|
||
preText = preText.substring(0, preText.length -1);
|
||
}
|
||
|
||
// Replace new line with space.
|
||
preText = preText.replace(/\n/g, " ");
|
||
|
||
if (preText.indexOf(" ") > 0) {
|
||
var words = preText.split(" ");
|
||
return words[words.length - 1]; //return last word
|
||
}
|
||
else {
|
||
return preText;
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Get in a textarea the previous word before the cursor.
|
||
*
|
||
* @param {string} id The ID of a textarea element.
|
||
* @returns {sting|null} Previous word or null if no word is available.
|
||
*/
|
||
function getPrevWord(id) {
|
||
var text = document.getElementById(id);
|
||
var caretPos = getCaretPosition(text);
|
||
var word = returnWord(text.value, caretPos);
|
||
if (word != null) {
|
||
return word
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* Get the cursor posiotion in an text element.
|
||
*
|
||
* @param {object} ctrl Textarea elemet.
|
||
* @returns {integer} Position of the cursor.
|
||
*/
|
||
function getCaretPosition(ctrl) {
|
||
var CaretPos = 0; // IE Support
|
||
if (document.selection) {
|
||
ctrl.focus();
|
||
var Sel = document.selection.createRange();
|
||
Sel.moveStart('character', -ctrl.value.length);
|
||
CaretPos = Sel.text.length;
|
||
}
|
||
// Firefox support
|
||
else if (ctrl.selectionStart || ctrl.selectionStart == '0') {
|
||
CaretPos = ctrl.selectionStart;
|
||
}
|
||
return (CaretPos);
|
||
}
|
||
})(jQuery);
|
||
|
||
// @license-end
|