694 lines
26 KiB
JavaScript
694 lines
26 KiB
JavaScript
/**
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* AJAX Upload ( http://valums.com/ajax-upload/ )
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* Copyright (c) Andris Valums
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* Licensed under the MIT license ( http://valums.com/mit-license/ )
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* Thanks to Gary Haran, David Mark, Corey Burns and others for contributions.
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*/
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(function () {
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/* global window */
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/* jslint browser: true, devel: true, undef: true, nomen: true, bitwise: true, regexp: true, newcap: true, immed: true */
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/**
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* Wrapper for FireBug's console.log
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*/
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function log(){
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if (typeof(console) != 'undefined' && typeof(console.log) == 'function'){
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Array.prototype.unshift.call(arguments, '[Ajax Upload]');
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console.log( Array.prototype.join.call(arguments, ' '));
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}
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}
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/**
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* Attaches event to a dom element.
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* @param {Element} el
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* @param type event name
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* @param fn callback This refers to the passed element
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*/
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function addEvent(el, type, fn){
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if (el.addEventListener) {
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el.addEventListener(type, fn, false);
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} else if (el.attachEvent) {
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el.attachEvent('on' + type, function(){
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fn.call(el);
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});
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} else {
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throw new Error('not supported or DOM not loaded');
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}
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}
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/**
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* Attaches resize event to a window, limiting
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* number of event fired. Fires only when encounteres
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* delay of 100 after series of events.
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*
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* Some browsers fire event multiple times when resizing
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* http://www.quirksmode.org/dom/events/resize.html
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*
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* @param fn callback This refers to the passed element
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*/
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function addResizeEvent(fn){
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var timeout;
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addEvent(window, 'resize', function(){
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if (timeout){
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clearTimeout(timeout);
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}
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timeout = setTimeout(fn, 100);
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});
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}
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// Needs more testing, will be rewriten for next version
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// getOffset function copied from jQuery lib (http://jquery.com/)
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if (document.documentElement.getBoundingClientRect){
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// Get Offset using getBoundingClientRect
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// http://ejohn.org/blog/getboundingclientrect-is-awesome/
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var getOffset = function(el){
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var box = el.getBoundingClientRect();
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var doc = el.ownerDocument;
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var body = doc.body;
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var docElem = doc.documentElement; // for ie
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var clientTop = docElem.clientTop || body.clientTop || 0;
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var clientLeft = docElem.clientLeft || body.clientLeft || 0;
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// In Internet Explorer 7 getBoundingClientRect property is treated as physical,
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// while others are logical. Make all logical, like in IE8.
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var zoom = 1;
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if (body.getBoundingClientRect) {
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var bound = body.getBoundingClientRect();
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zoom = (bound.right - bound.left) / body.clientWidth;
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}
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if (zoom > 1) {
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clientTop = 0;
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clientLeft = 0;
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}
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var top = box.top / zoom + (window.pageYOffset || docElem && docElem.scrollTop / zoom || body.scrollTop / zoom) - clientTop, left = box.left / zoom + (window.pageXOffset || docElem && docElem.scrollLeft / zoom || body.scrollLeft / zoom) - clientLeft;
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return {
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top: top,
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left: left
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};
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};
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} else {
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// Get offset adding all offsets
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var getOffset = function(el){
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var top = 0, left = 0;
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do {
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top += el.offsetTop || 0;
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left += el.offsetLeft || 0;
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el = el.offsetParent;
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} while (el);
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return {
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left: left,
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top: top
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};
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};
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}
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/**
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* Returns left, top, right and bottom properties describing the border-box,
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* in pixels, with the top-left relative to the body
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* @param {Element} el
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* @return {Object} Contains left, top, right,bottom
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*/
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function getBox(el){
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var left, right, top, bottom;
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var offset = getOffset(el);
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left = offset.left;
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top = offset.top;
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right = left + el.offsetWidth;
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bottom = top + el.offsetHeight;
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return {
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left: left,
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right: right,
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top: top,
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bottom: bottom
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};
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}
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/**
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* Helper that takes object literal
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* and add all properties to element.style
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* @param {Element} el
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* @param {Object} styles
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*/
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function addStyles(el, styles){
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for (var name in styles) {
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if (styles.hasOwnProperty(name)) {
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el.style[name] = styles[name];
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}
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}
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}
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/**
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* Function places an absolutely positioned
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* element on top of the specified element
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* copying position and dimentions.
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* @param {Element} from
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* @param {Element} to
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*/
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function copyLayout(from, to){
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var box = getBox(from);
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addStyles(to, {
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position: 'absolute',
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left : box.left + 'px',
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top : box.top + 'px',
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width : from.offsetWidth + 'px',
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height : from.offsetHeight + 'px',
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cursor : 'pointer'
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});
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to.title = from.title;
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}
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/**
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* Creates and returns element from html chunk
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* Uses innerHTML to create an element
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*/
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var toElement = (function(){
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var div = document.createElement('div');
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return function(html){
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div.innerHTML = html;
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var el = div.firstChild;
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return div.removeChild(el);
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};
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})();
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/**
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* Function generates unique id
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* @return unique id
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*/
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var getUID = (function(){
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var id = 0;
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return function(){
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return 'ValumsAjaxUpload' + id++;
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};
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})();
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/**
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* Get file name from path
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* @param {String} file path to file
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* @return filename
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*/
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function fileFromPath(file){
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return file.replace(/.*(\/|\\)/, "");
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}
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/**
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* Get file extension lowercase
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* @param {String} file name
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* @return file extenstion
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*/
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function getExt(file){
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return (-1 !== file.indexOf('.')) ? file.replace(/.*[.]/, '') : '';
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}
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function hasClass(el, name){
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var re = new RegExp('\\b' + name + '\\b');
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return re.test(el.className);
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}
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function addClass(el, name){
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if ( ! hasClass(el, name)){
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el.className += ' ' + name;
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}
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}
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function removeClass(el, name){
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var re = new RegExp('\\b' + name + '\\b');
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el.className = el.className.replace(re, '');
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}
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function removeNode(el){
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el.parentNode.removeChild(el);
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}
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/**
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* Easy styling and uploading
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* @constructor
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* @param button An element you want convert to
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* upload button. Tested dimentions up to 500x500px
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* @param {Object} options See defaults below.
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*/
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window.AjaxUpload = function(button, options){
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this._settings = {
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// Location of the server-side upload script
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action: 'upload.php',
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// File upload name
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name: 'userfile',
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// Additional data to send
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data: {},
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// Submit file as soon as it's selected
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autoSubmit: true,
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// The type of data that you're expecting back from the server.
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// html and xml are detected automatically.
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// Only useful when you are using json data as a response.
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// Set to "json" in that case.
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responseType: false,
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// Class applied to button when mouse is hovered
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hoverClass: 'hover',
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// Class applied to button when button is focused
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focusClass: 'focus',
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// Class applied to button when AU is disabled
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disabledClass: 'disabled',
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// When user selects a file, useful with autoSubmit disabled
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// You can return false to cancel upload
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onChange: function(file, extension){
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},
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// Callback to fire before file is uploaded
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// You can return false to cancel upload
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onSubmit: function(file, extension){
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},
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// Fired when file upload is completed
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// WARNING! DO NOT USE "FALSE" STRING AS A RESPONSE!
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onComplete: function(file, response){
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}
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};
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// Merge the users options with our defaults
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for (var i in options) {
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if (options.hasOwnProperty(i)){
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this._settings[i] = options[i];
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}
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}
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// button isn't necessary a dom element
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if (button.jquery){
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// jQuery object was passed
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button = button[0];
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} else if (typeof button == "string") {
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if (/^#.*/.test(button)){
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// If jQuery user passes #elementId don't break it
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button = button.slice(1);
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}
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button = document.getElementById(button);
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}
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if ( ! button || button.nodeType !== 1){
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throw new Error("Please make sure that you're passing a valid element");
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}
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if ( button.nodeName.toUpperCase() == 'A'){
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// disable link
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addEvent(button, 'click', function(e){
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if (e && e.preventDefault){
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e.preventDefault();
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} else if (window.event){
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window.event.returnValue = false;
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}
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});
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}
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// DOM element
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this._button = button;
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// DOM element
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this._input = null;
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// If disabled clicking on button won't do anything
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this._disabled = false;
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// if the button was disabled before refresh if will remain
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// disabled in FireFox, let's fix it
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this.enable();
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this._rerouteClicks();
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};
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// assigning methods to our class
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AjaxUpload.prototype = {
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setData: function(data){
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this._settings.data = data;
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},
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disable: function(){
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addClass(this._button, this._settings.disabledClass);
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this._disabled = true;
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var nodeName = this._button.nodeName.toUpperCase();
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if (nodeName == 'INPUT' || nodeName == 'BUTTON'){
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this._button.setAttribute('disabled', 'disabled');
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}
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// hide input
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if (this._input){
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// We use visibility instead of display to fix problem with Safari 4
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// The problem is that the value of input doesn't change if it
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// has display none when user selects a file
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this._input.parentNode.style.visibility = 'hidden';
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}
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},
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enable: function(){
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removeClass(this._button, this._settings.disabledClass);
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this._button.removeAttribute('disabled');
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this._disabled = false;
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},
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/**
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* Creates invisible file input
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* that will hover above the button
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* <div><input type='file' /></div>
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*/
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_createInput: function(){
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var self = this;
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var input = document.createElement("input");
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input.setAttribute('type', 'file');
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input.setAttribute('name', this._settings.name);
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addStyles(input, {
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'position' : 'absolute',
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// in Opera only 'browse' button
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// is clickable and it is located at
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// the right side of the input
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'right' : 0,
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'margin' : 0,
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'padding' : 0,
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'fontSize' : '480px',
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// in Firefox if font-family is set to
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// 'inherit' the input doesn't work
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'fontFamily' : 'sans-serif',
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'cursor' : 'pointer'
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});
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var div = document.createElement("div");
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addStyles(div, {
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'display' : 'block',
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'position' : 'absolute',
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'overflow' : 'hidden',
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'margin' : 0,
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'padding' : 0,
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'opacity' : 0,
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// Make sure browse button is in the right side
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// in Internet Explorer
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'direction' : 'ltr',
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//Max zIndex supported by Opera 9.0-9.2
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'zIndex': 2147483583
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});
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// Make sure that element opacity exists.
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// Otherwise use IE filter
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if ( div.style.opacity !== "0") {
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if (typeof(div.filters) == 'undefined'){
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throw new Error('Opacity not supported by the browser');
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}
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div.style.filter = "alpha(opacity=0)";
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}
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addEvent(input, 'change', function(){
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if ( ! input || input.value === ''){
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return;
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}
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// Get filename from input, required
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// as some browsers have path instead of it
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var file = fileFromPath(input.value);
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if (false === self._settings.onChange.call(self, file, getExt(file))){
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self._clearInput();
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return;
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}
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// Submit form when value is changed
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if (self._settings.autoSubmit) {
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self.submit();
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}
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});
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addEvent(input, 'mouseover', function(){
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addClass(self._button, self._settings.hoverClass);
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});
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addEvent(input, 'mouseout', function(){
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removeClass(self._button, self._settings.hoverClass);
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removeClass(self._button, self._settings.focusClass);
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// We use visibility instead of display to fix problem with Safari 4
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// The problem is that the value of input doesn't change if it
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// has display none when user selects a file
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input.parentNode.style.visibility = 'hidden';
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});
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addEvent(input, 'focus', function(){
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addClass(self._button, self._settings.focusClass);
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});
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addEvent(input, 'blur', function(){
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removeClass(self._button, self._settings.focusClass);
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});
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div.appendChild(input);
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document.body.appendChild(div);
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this._input = input;
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},
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_clearInput : function(){
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if (!this._input){
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return;
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}
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// this._input.value = ''; Doesn't work in IE6
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removeNode(this._input.parentNode);
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this._input = null;
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this._createInput();
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removeClass(this._button, this._settings.hoverClass);
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removeClass(this._button, this._settings.focusClass);
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},
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/**
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* Function makes sure that when user clicks upload button,
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* the this._input is clicked instead
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*/
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_rerouteClicks: function(){
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var self = this;
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// IE will later display 'access denied' error
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// if you use using self._input.click()
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// other browsers just ignore click()
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addEvent(self._button, 'mouseover', function(){
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if (self._disabled){
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return;
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}
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if ( ! self._input){
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self._createInput();
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}
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var div = self._input.parentNode;
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copyLayout(self._button, div);
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div.style.visibility = 'visible';
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});
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// commented because we now hide input on mouseleave
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/**
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* When the window is resized the elements
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* can be misaligned if button position depends
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* on window size
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*/
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//addResizeEvent(function(){
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// if (self._input){
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// copyLayout(self._button, self._input.parentNode);
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// }
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//});
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},
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/**
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* Creates iframe with unique name
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* @return {Element} iframe
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*/
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_createIframe: function(){
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// We can't use getTime, because it sometimes return
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// same value in safari :(
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var id = getUID();
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// We can't use following code as the name attribute
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// won't be properly registered in IE6, and new window
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// on form submit will open
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// var iframe = document.createElement('iframe');
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// iframe.setAttribute('name', id);
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var iframe = toElement('<iframe src="javascript:false;" name="' + id + '" />');
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// src="javascript:false; was added
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// because it possibly removes ie6 prompt
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// "This page contains both secure and nonsecure items"
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// Anyway, it doesn't do any harm.
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iframe.setAttribute('id', id);
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iframe.style.display = 'none';
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document.body.appendChild(iframe);
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return iframe;
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},
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/**
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* Creates form, that will be submitted to iframe
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* @param {Element} iframe Where to submit
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* @return {Element} form
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*/
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_createForm: function(iframe){
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var settings = this._settings;
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// We can't use the following code in IE6
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// var form = document.createElement('form');
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// form.setAttribute('method', 'post');
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// form.setAttribute('enctype', 'multipart/form-data');
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// Because in this case file won't be attached to request
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var form = toElement('<form method="post" enctype="multipart/form-data"></form>');
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form.setAttribute('action', settings.action);
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form.setAttribute('target', iframe.name);
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form.style.display = 'none';
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document.body.appendChild(form);
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// Create hidden input element for each data key
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for (var prop in settings.data) {
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if (settings.data.hasOwnProperty(prop)){
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var el = document.createElement("input");
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el.setAttribute('type', 'hidden');
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el.setAttribute('name', prop);
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el.setAttribute('value', settings.data[prop]);
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form.appendChild(el);
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}
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}
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return form;
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},
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/**
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* Gets response from iframe and fires onComplete event when ready
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* @param iframe
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* @param file Filename to use in onComplete callback
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*/
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_getResponse : function(iframe, file){
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// getting response
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var toDeleteFlag = false, self = this, settings = this._settings;
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addEvent(iframe, 'load', function(){
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if (// For Safari
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iframe.src == "javascript:'%3Chtml%3E%3C/html%3E';" ||
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// For FF, IE
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iframe.src == "javascript:'<html></html>';"){
|
|
// First time around, do not delete.
|
|
// We reload to blank page, so that reloading main page
|
|
// does not re-submit the post.
|
|
|
|
if (toDeleteFlag) {
|
|
// Fix busy state in FF3
|
|
setTimeout(function(){
|
|
removeNode(iframe);
|
|
}, 0);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
var doc = iframe.contentDocument ? iframe.contentDocument : window.frames[iframe.id].document;
|
|
|
|
// fixing Opera 9.26,10.00
|
|
if (doc.readyState && doc.readyState != 'complete') {
|
|
// Opera fires load event multiple times
|
|
// Even when the DOM is not ready yet
|
|
// this fix should not affect other browsers
|
|
return;
|
|
}
|
|
|
|
// fixing Opera 9.64
|
|
if (doc.body && doc.body.innerHTML == "false") {
|
|
// In Opera 9.64 event was fired second time
|
|
// when body.innerHTML changed from false
|
|
// to server response approx. after 1 sec
|
|
return;
|
|
}
|
|
|
|
var response;
|
|
|
|
if (doc.XMLDocument) {
|
|
// response is a xml document Internet Explorer property
|
|
response = doc.XMLDocument;
|
|
} else if (doc.body){
|
|
// response is html document or plain text
|
|
response = doc.body.innerHTML;
|
|
|
|
if (settings.responseType && settings.responseType.toLowerCase() == 'json') {
|
|
// If the document was sent as 'application/javascript' or
|
|
// 'text/javascript', then the browser wraps the text in a <pre>
|
|
// tag and performs html encoding on the contents. In this case,
|
|
// we need to pull the original text content from the text node's
|
|
// nodeValue property to retrieve the unmangled content.
|
|
// Note that IE6 only understands text/html
|
|
if (doc.body.firstChild && doc.body.firstChild.nodeName.toUpperCase() == 'PRE') {
|
|
doc.normalize();
|
|
response = doc.body.firstChild.firstChild.nodeValue;
|
|
}
|
|
|
|
if (response) {
|
|
response = eval("(" + response + ")");
|
|
} else {
|
|
response = {};
|
|
}
|
|
}
|
|
} else {
|
|
// response is a xml document
|
|
response = doc;
|
|
}
|
|
|
|
settings.onComplete.call(self, file, response);
|
|
|
|
// Reload blank page, so that reloading main page
|
|
// does not re-submit the post. Also, remember to
|
|
// delete the frame
|
|
toDeleteFlag = true;
|
|
|
|
// Fix IE mixed content issue
|
|
iframe.src = "javascript:'<html></html>';";
|
|
});
|
|
},
|
|
/**
|
|
* Upload file contained in this._input
|
|
*/
|
|
submit: function(){
|
|
var self = this, settings = this._settings;
|
|
|
|
if ( ! this._input || this._input.value === ''){
|
|
return;
|
|
}
|
|
|
|
var file = fileFromPath(this._input.value);
|
|
|
|
// user returned false to cancel upload
|
|
if (false === settings.onSubmit.call(this, file, getExt(file))){
|
|
this._clearInput();
|
|
return;
|
|
}
|
|
|
|
// sending request
|
|
var iframe = this._createIframe();
|
|
var form = this._createForm(iframe);
|
|
|
|
// assuming following structure
|
|
// div -> input type='file'
|
|
removeNode(this._input.parentNode);
|
|
removeClass(self._button, self._settings.hoverClass);
|
|
removeClass(self._button, self._settings.focusClass);
|
|
|
|
form.appendChild(this._input);
|
|
|
|
form.submit();
|
|
|
|
// request set, clean up
|
|
removeNode(form); form = null;
|
|
removeNode(this._input); this._input = null;
|
|
|
|
// Get response from iframe and fire onComplete event when ready
|
|
this._getResponse(iframe, file);
|
|
|
|
// get ready for next request
|
|
this._createInput();
|
|
}
|
|
};
|
|
})();
|