web前端|js教程
AjaxUpLoad.js,javascript,上传
web前端-js教程
这篇文章主要为大家详细介绍了AjaxUpLoad.js实现文件上传的具体代码，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
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AjaxUpload.js文件的代码，供大家参考，具体内容如下
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/** * AJAX Upload ( /ajax-upload/ ) * Copyright (c) Andris Valums * Licensed under the MIT license ( /mit-license/ ) * Thanks to Gary Haran, David Mark, Corey Burns and others for contributions */ (function () { /* global window */ /* jslint browser: true, devel: true, undef: true, nomen: true, bitwise: true, regexp: true, newcap: true, immed: true */ /** * Wrapper for FireBugs console.log */ function log() { if (typeof(console) != undefined && typeof(console.log) == function) { Array.prototype.unshift.call(arguments, [Ajax Upload]); console.log(Array.prototype.join.call(arguments, )); } } /** * Attaches event to a dom element. * @param {Element} el * @param type event name * @param fn callback This refers to the passed element */ function addEvent(el, type, fn) { if (el.addEventListener) { el.addEventListener(type, fn, false); } else if (el.attachEvent) { el.attachEvent(on + type, function () {fn.call(el); }); } else { throw new Error( ot supported or DOM not loaded); } } /** * Attaches resize event to a window, limiting * number of event fired. Fires only when encounteres * delay of 100 after series of events. * * Some browsers fire event multiple times when resizing * /dom/events/resize.html * * @param fn callback This refers to the passed element */ function addResizeEvent(fn) { var timeout; addEvent(window, esize, function () { if (timeout) {clearTimeout(timeout); } timeout = setTimeout(fn, 100); }); } // Needs more testing, will be rewriten for next version // getOffset function copied from jQuery lib (/) if (document.documentElement.getBoundingClientRect) { // Get Offset using getBoundingClientRect // /blog/getboundingclientrect-is-awesome/ var getOffset = function (el) { var box = el.getBoundingClientRect(); var doc = el.ownerDocument; var body = doc.body; var docElem = doc.documentElement; // for ie var clientTop = docElem.clientTop || body.clientTop || 0; var clientLeft = docElem.clientLeft || body.clientLeft || 0;// In Internet Explorer 7 getBoundingClientRect property is treated as physical, // while others are logical. Make all logical, like in IE8. var zoom = 1; if (body.getBoundingClientRect) {var bound = body.getBoundingClientRect();zoom = (bound.right - bound.left) / body.clientWidth; }if (zoom > 1) {clientTop = 0;clientLeft = 0; }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;return {top: top,left: left }; }; } else { // Get offset adding all offsets var getOffset = function (el) { var top = 0,left = 0; do {top += el.offsetTop || 0;left += el.offsetLeft || 0;el = el.offsetParent; } while (el);return {left: left,top: top }; }; } /** * Returns left, top, right and bottom properties describing the border-box, * in pixels, with the top-left relative to the body * @param {Element} el * @return {Object} Contains left, top, right,bottom */ function getBox(el) { var left, right, top, bottom; var offset = getOffset(el); left = offset.left; top = offset.top; right = left + el.offsetWidth; bottom = top + el.offsetHeight; return { left: left, right: right, top: top, bottom: bottom }; } /** * Helper that takes object literal * and add all properties to element.style * @param {Element} el * @param {Object} styles */ function addStyles(el, styles) { for (var name in styles) { if (styles.hasOwnProperty(name)) {el.style[name] = styles[name]; } } } /** * Function places an absolutely positioned * element on top of the specified element * copying position and dimentions. * @param {Element} from * @param {Element} to */ function copyLayout(from, to) { var box = getBox(from); addStyles(to, { position: absolute, left: box.left + px, top: box.top + px, width: from.offsetWidth + px, height: from.offsetHeight + px }); } /** * Creates and returns element from html chunk * Uses innerHTML to create an element */ var toElement = (function () { var p = document.createElement(p); return function (html) { p.innerHTML = html; var el = p.firstChild; return p.removeChild(el); }; })(); /** * Function generates unique id * @return unique id */ var getUID = (function () { var id = 0; return function () { return ValumsAjaxUpload + id++; }; })(); /** * Get file name from path * @param {String} file path to file * @return filename */ function fileFromPath(file) { return file.replace(/.*(\/|\\)/, ""); } /** * Get file extension lowercase * @param {String} file name * @return file extenstion */ function getExt(file) { return (-1 !== file.indexOf(.)) ? file.replace(/.*[.]/, \) : \; } function hasClass(el, name) { var re = new RegExp(\\ + name + \\); return re.test(el.className); } function addClass(el, name) { if (!hasClass(el, name)) { el.className += + name; } } function removeClass(el, name) { var re = new RegExp(\\ + name + \\); el.className = el.className.replace(re, \); } function removeNode(el) { el.parentNode.removeChild(el); } /** * Easy styling and uploading * @constructor * @param button An element you want convert to * upload button. Tested dimentions up to 500x500px * @param {Object} options See defaults below. */ window.AjaxUpload = function (button, options) { this._settings = { // Location of the server-side upload script action: upload.php, // File upload name name: userfile, // Additional data to send data: {}, // Submit file as soon as its selected autoSubmit: true, // The type of data that you e expecting back from the server. // html and xml are detected automatically. // Only useful when you are using json data as a response. // Set to "json" in that case. responseType: false, // Class applied to button when mouse is hovered hoverClass: hover, // Class applied to button when AU is disabled disabledClass: disabled, // When user selects a file, useful with autoSubmit disabled // You can return false to cancel upload onChange: function (file, extension) {}, // Callback to fire before file is uploaded // You can return false to cancel upload onSubmit: function (file, extension) {}, // Fired when file upload is completed // WARNING! DO NOT USE "FALSE" STRING AS A RESPONSE! onComplete: function (file, response) {} }; // Merge the users options with our defaults for (var i in options) { if (options.hasOwnProperty(i)) {this._settings[i] = options[i]; } } // button isn necessary a dom element if (button.jquery) { // jQuery object was passed button = button[0]; } else if (typeof button == "string") { if (/^#.*/.test(button)) {// If jQuery user passes #elementId don break it button = button.slice(1); }button = document.getElementById(button); } if (!button || button.nodeType !== 1) { throw new Error("Please make sure that you e passing a valid element"); } if (button.nodeName.toUpperCase() == A) { // disable linkaddEvent(button, click, function (e) {if (e && e.preventDefault) {e.preventDefault();} else if (window.event) {window.event.returnValue = false;} }); } // DOM element this._button = button; // DOM element this._input = null; // If disabled clicking on button won do anything this._disabled = false; // if the button was disabled before refresh if will remain // disabled in FireFox, lets fix it this.enable(); this._rerouteClicks(); }; // assigning methods to our class AjaxUpload.prototype = { setData: function (data) { this._settings.data = data; }, disable: function () { addClass(this._button, this._settings.disabledClass); this._disabled = true;var nodeName = this._button.nodeName.toUpperCase(); if (nodeName == INPUT || nodeName == BUTTON) {this._button.setAttribute(disabled, disabled); }// hide input if (this._input) {// We use visibility instead of display to fix problem with Safari 4// The problem is that the value of input doesn change if it// has display none when user selects a file this._input.parentNode.style.visibility = hidden; } }, enable: function () { removeClass(this._button, this._settings.disabledClass); this._button.removeAttribute(disabled); this._disabled = false; }, /** * Creates invisible file input * that will hover above the button *
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*/ _createInput: function () { var self = this;var input = document.createElement("input"); input.setAttribute( ype, file); input.setAttribute( ame, this._settings.name);addStyles(input, {position: absolute,// in Opera only rowse button// is clickable and it is located at// the right side of the input ight: 0,margin: 0,padding: 0,fontSize: 480px,cursor: pointer });var p = document.createElement("p"); addStyles(p, {display: lock,position: absolute,overflow: hidden,margin: 0,padding: 0,opacity: 0,// Make sure browse button is in the right side// in Internet Explorerdirection: ltr,//Max zIndex supported by Opera 9.0-9.2zIndex: 2147483583 });// Make sure that element opacity exists. // Otherwise use IE filter if (p.style.opacity !== "0") {if (typeof(p.filters) == undefined) {throw new Error(Opacity not supported by the browser);}p.style.filter = "alpha(opacity=0)"; }addEvent(input, change, function () {if (!input || input.value === \) {return;}// Get filename from input, required // as some browsers have path instead of it var file = fileFromPath(input.value);if (false === self._settings.onChange.call(self, file, getExt(file))) {self._clearInput();return;}// Submit form when value is changedif (self._settings.autoSubmit) {self.submit();} });addEvent(input, mouseover, function () {addClass(self._button, self._settings.hoverClass); });addEvent(input, mouseout, function () {removeClass(self._button, self._settings.hoverClass);// We use visibility instead of display to fix problem with Safari 4// The problem is that the value of input doesn change if it// has display none when user selects a file input.parentNode.style.visibility = hidden;});p.appendChild(input); document.body.appendChild(p);this._input = input; }, _clearInput: function () { if (!this._input) {return; }// this._input.value = \; Doesn work in IE6 removeNode(this._input.parentNode); this._input = null; this._createInput();removeClass(this._button, this._settings.hoverClass); }, /** * Function makes sure that when user clicks upload button, * the this._input is clicked instead */ _rerouteClicks: function () { var self = this;// IE will later display access denied error // if you use using self._input.click() // other browsers just ignore click()addEvent(self._button, mouseover, function () {if (self._disabled) {return;}if (!self._input) {self._createInput();}var p = self._input.parentNode;copyLayout(self._button, p);p.style.visibility = visible;});// commented because we now hide input on mouseleave /*** When the window is resized the elements* can be misaligned if button position depends* on window size*/ //addResizeEvent(function(){ // if (self._input){ // copyLayout(self._button, self._input.parentNode); // } //}); }, /** * Creates iframe with unique name * @return {Element} iframe */ _createIframe: function () { // We can use getTime, because it sometimes return // same value in safari :( var id = getUID();// We can use following code as the name attribute // won be properly registered in IE6, and new window // on form submit will open // var iframe = document.createElement(iframe); // iframe.setAttribute( ame, id); var iframe = toElement(\); // src="javascript:false; was added // because it possibly removes ie6 prompt // "This page contains both secure and nonsecure items" // Anyway, it doesn do any harm. iframe.setAttribute(id, id);iframe.style.display = one; document.body.appendChild(iframe);return iframe; }, /** * Creates form, that will be submitted to iframe * @param {Element} iframe Where to submit * @return {Element} form */ _createForm: function (iframe) { var settings = this._settings;// We can use the following code in IE6 // var form = document.createElement(form); // form.setAttribute(method, post); // form.setAttribute(enctype, multipart/form-data); // Because in this case file won be attached to request var form = toElement(\);form.setAttribute(action, settings.action); form.setAttribute( arget, iframe.name); form.style.display = one; document.body.appendChild(form);// Create hidden input element for each data key for (var prop in settings.data) {if (settings.data.hasOwnProperty(prop)) {var el = document.createElement("input");el.setAttribute( ype, hidden);el.setAttribute( ame, prop);el.setAttribute(value, settings.data[prop]);form.appendChild(el);} } return form; }, /** * Gets response from iframe and fires onComplete event when ready * @param iframe * @param file Filename to use in onComplete callback */ _getResponse: function (iframe, file) { // getting response var toDeleteFlag = false,self = this,settings = this._settings;addEvent(iframe, load, function () {if ( // For Safariiframe.src == "javascript:\%3Chtml%3E%3C/html%3E;" ||// For FF, IEiframe.src == "javascript:\;") {// 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 9.26,10.00if (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 browsersreturn;}// fixing Opera 9.64if (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 secreturn;}var response;if (doc.XMLDocument) {// response is a xml document Internet Explorer propertyresponse = doc.XMLDocument;} else if (doc.body) {// response is html document or plain textresponse = doc.body.innerHTML; if (settings.responseType && settings.responseType.toLowerCase() == json) { // If the document was sent as application/javascript or // ext/javascript, then the browser wraps the text in a
// tag and performs html encoding on the contents. In this case, // we need to pull the original text content from the text nodes // nodeValue property to retrieve the unmangled content. // Note that IE6 only understands text/html if (doc.body.firstChild && doc.body.firstChild.nodeName.toUpperCase() == PRE) { response = doc.body.firstChild.firstChild.nodeValue; } if (response) { response = eval("(" + response + ")"); } else { response = {}; }}} else {// response is a xml documentresponse = 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 frametoDeleteFlag = true;// Fix IE mixed content issueiframe.src = "javascript:\;"; }); }, /** * 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 requestvar iframe = this._createIframe(); var form = this._createForm(iframe);// assuming following structure // p -> input type=file removeNode(this._input.parentNode); removeClass(self._button, self._settings.hoverClass);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(); } }; })();
上面是我整理给大家的，希望今后会对大家有帮助。
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