这次给大家带来AjaxUpLoad.js怎样实现文件上传，AjaxUpLoad.js实现文件上传的注意事项有哪些，下面就是实战案例，一起来看一下。
AjaxUpload.js文件的代码，供大家参考，具体内容如下
/**
* AJAX Upload ( http://valums.com/ajax-upload/ )
* Copyright (c) Andris Valums
* Licensed under the MIT license ( http://valums.com/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 FireBug's 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('not 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
* http://www.quirksmode.org/dom/events/resize.html
*
* @param fn callback This refers to the passed element
*/
function addResizeEvent(fn) {
var timeout;
addEvent(window, 'resize', function () {
if (timeout) {
clearTimeout(timeout);
}
timeout = setTimeout(fn, 100);
});
}
// Needs more testing, will be rewriten for next version
// getOffset function copied from jQuery lib (http://jquery.com/)
if (document.documentElement.getBoundingClientRect) {
// Get Offset using getBoundingClientRect
// http://ejohn.org/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('\\b' + name + '\\b');
return re.test(el.className);
}
function addClass(el, name) {
if (!hasClass(el, name)) {
el.className += ' ' + name;
}
}
function removeClass(el, name) {
var re = new RegExp('\\b' + name + '\\b');
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 it's selected
autoSubmit: true,
// The type of data that you're 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't 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't break it
button = button.slice(1);
}
button = document.getElementById(button);
}
if (!button || button.nodeType !== 1) {
throw new Error("Please make sure that you're passing a valid element");
}
if (button.nodeName.toUpperCase() == 'A') {
// disable link
addEvent(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't do anything
this._disabled = false;
// if the button was disabled before refresh if will remain
// disabled in FireFox, let's 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't 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
* <p><input type='file' /></p>
*/
_createInput: function () {
var self = this;
var input = document.createElement("input");
input.setAttribute('type', 'file');
input.setAttribute('name', this._settings.name);
addStyles(input, {
'position': 'absolute',
// in Opera only 'browse' button
// is clickable and it is located at
// the right side of the input
'right': 0,
'margin': 0,
'padding': 0,
'fontSize': '480px',
'cursor': 'pointer'
});
var p = document.createElement("p");
addStyles(p, {
'display': 'block',
'position': 'absolute',
'overflow': 'hidden',
'margin': 0,
'padding': 0,
'opacity': 0,
// Make sure browse button is in the right side
// in Internet Explorer
'direction': 'ltr',
//Max zIndex supported by Opera 9.0-9.2
'zIndex': 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 changed
if (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't 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't 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't use getTime, because it sometimes return
// same value in safari :(
var id = getUID();
// We can't use following code as the name attribute
// won't be properly registered in IE6, and new window
// on form submit will open
// var iframe = document.createElement('iframe');
// iframe.setAttribute('name', id);
var iframe = toElement('<iframe src="javascript:false;" name="' + id + '" />');
// src="javascript:false; was added
// because it possibly removes ie6 prompt
// "This page contains both secure and nonsecure items"
// Anyway, it doesn't do any harm.
iframe.setAttribute('id', id);
iframe.style.display = 'none';
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't 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't be attached to request
var form = toElement('<form method="post" enctype="multipart/form-data"></form>');
form.setAttribute('action', settings.action);
form.setAttribute('target', iframe.name);
form.style.display = 'none';
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('type', 'hidden');
el.setAttribute('name', 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 Safari
iframe.src == "javascript:'%3Chtml%3E%3C/html%3E';" ||
// For FF, IE
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 class="brush:php;toolbar:false">
// 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') {
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
// 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();
}
};
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