📄 iframexhr.js
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/** * XMLHttpRequest Iframe fallback * * http://lxr.mozilla.org/seamonkey/source/extensions/xmlextras/tests/ - should work with these * * @category HTML * @package AJAX * @author Elizabeth Smith <auroraeosrose@gmail.com> * @copyright 2005 Elizabeth Smith * @license http://www.opensource.org/licenses/lgpl-license.php LGPL */HTML_AJAX_IframeXHR_instances = new Object();function HTML_AJAX_IframeXHR(){ this._id = 'HAXHR_iframe_' + new Date().getTime(); HTML_AJAX_IframeXHR_instances[this._id] = this;}HTML_AJAX_IframeXHR.prototype = {// Data not sent with text/xml Content-Type will only be available via the responseText property // properties available in safari/mozilla/IE xmlhttprequest object onreadystatechange: null, // Event handler for an event that fires at every state change readyState: 0, // Object status integer: 0 = uninitialized 1 = loading 2 = loaded 3 = interactive 4 = complete responseText: '', // String version of data returned from server process responseXML: null, // DOM-compatible document object of data returned from server process status: 0, // Numeric code returned by server, such as 404 for "Not Found" or 200 for "OK" statusText: '', // String message accompanying the status code iframe: true, // flag for iframe //these are private properties used internally to keep track of stuff _id: null, // iframe id, unique to object(hopefully) _url: null, // url sent by open _method: null, // get or post _async: null, // sync or async sent by open _headers: new Object(), //request headers to send, actually sent as form vars _response: new Object(), //response headers received _phpclass: null, //class to send _phpmethod: null, //method to send _history: null, // opera has to have history munging // Stops the current request abort: function() { var iframe = document.getElementById(this._id); if (iframe) { document.body.removeChild(iframe); } if (this._timeout) { window.clearTimeout(this._timeout); } this.readyState = 1; if (typeof(this.onreadystatechange) == "function") { this.onreadystatechange(); } }, // This will send all headers in this._response and will include lastModified and contentType if not already set getAllResponseHeaders: function() { var string = ''; for (i in this._response) { string += i + ' : ' + this._response[i] + "\n"; } return string; }, // This will use lastModified and contentType if they're not set getResponseHeader: function(header) { return (this._response[header] ? this._response[header] : null); }, // Assigns a label/value pair to the header to be sent with a request setRequestHeader: function(label, value) { this._headers[label] = value; return; }, // Assigns destination URL, method, and other optional attributes of a pending request open: function(method, url, async, username, password) { if (!document.body) { throw('CANNOT_OPEN_SEND_IN_DOCUMENT_HEAD'); } //exceptions for not enough arguments if (!method || !url) { throw('NOT_ENOUGH_ARGUMENTS:METHOD_URL_REQUIRED'); } //get and post are only methods accepted this._method = (method.toUpperCase() == 'POST' ? 'POST' : 'GET'); this._decodeUrl(url); this._async = async; if(!this._async && document.readyState && !window.opera) { throw('IE_DOES_NOT_SUPPORT_SYNC_WITH_IFRAMEXHR'); } //set status to loading and call onreadystatechange this.readyState = 1; if(typeof(this.onreadystatechange) == "function") { this.onreadystatechange(); } }, // Transmits the request, optionally with postable string or DOM object data send: function(content) { //attempt opera history munging if (window.opera) { this._history = window.history.length; } //create a "form" for the contents of the iframe var form = '<html><body><form method="' + (this._url.indexOf('px=') < 0 ? this._method : 'post') + '" action="' + this._url + '">'; //tell iframe unwrapper this IS an iframe form += '<input name="Iframe_XHR" value="1" />'; //class and method if (this._phpclass != null) { form += '<input name="Iframe_XHR_class" value="' + this._phpclass + '" />'; } if (this._phpmethod != null) { form += '<input name="Iframe_XHR_method" value="' + this._phpmethod + '" />'; } // fake headers for (label in this._headers) { form += '<textarea name="Iframe_XHR_headers[]">' + label +':'+ this._headers[label] + '</textarea>'; } // add id form += '<textarea name="Iframe_XHR_id">' + this._id + '</textarea>'; if (content != null && content.length > 0) { form += '<textarea name="Iframe_XHR_data">' + content + '</textarea>'; } form += '<input name="Iframe_XHR_HTTP_method" value="' + this._method + '" />'; form += '<s'+'cript>document.forms[0].submit();</s'+'cript></form></body></html>'; form = "javascript:document.write('" + form.replace(/\'/g,"\\'") + "');void(0);"; this.readyState = 2; if (typeof(this.onreadystatechange) == "function") { this.onreadystatechange(); } // try to create an iframe with createElement and append node try { var iframe = document.createElement('iframe'); iframe.id = this._id; // display: none will fail on some browsers iframe.style.visibility = 'hidden'; // for old browsers with crappy css iframe.style.border = '0'; iframe.style.width = '0'; iframe.style.height = '0'; if (document.all) { // MSIE, opera iframe.src = form; document.body.appendChild(iframe); } else { document.body.appendChild(iframe); iframe.src = form; } } catch(exception) { // dom failed, write the sucker manually var html = '<iframe src="' + form +'" id="' + this._id + '" style="visibility:hidden;border:0;height:0;width:0;"></iframe>'; document.body.innerHTML += html; } if (this._async == true) { //avoid race state if onload is called first if (this.readyState < 3) { this.readyState = 3; if(typeof(this.onreadystatechange) == "function") { this.onreadystatechange(); } } } else { //we force a while loop for sync, it's ugly but hopefully it works while (this.readyState != 4) { //just check to see if we can up readyState if (this.readyState < 3) { this.readyState = 3; if(typeof(this.onreadystatechange) == "function") { this.onreadystatechange(); } } } } }, // attached as an onload function to the iframe to trigger when we're done isLoaded: function(headers, data) { this.readyState = 4; //set responseText, Status, StatusText this.status = 200; this.statusText = 'OK'; this.responseText = data; this._response = headers; if (!this._response['Last-Modified']) { string += 'Last-Modified : ' + document.getElementById(this._id).lastModified + "\n"; } if (!this._response['Content-Type']) { string += 'Content-Type : ' + document.getElementById(this._id).contentType + "\n"; } // if this is xml populate responseXML accordingly if (this._response['Content-Type'] == 'application/xml') { return new DOMParser().parseFromString(this.responseText, 'application/xml'); } //attempt opera history munging in opera 8+ - this is a REGRESSION IN OPERA if (window.opera && window.opera.version) { //go back current history - old history window.history.go(this._history - window.history.length); } if (typeof(this.onreadystatechange) == "function") { this.onreadystatechange(); } document.body.removeChild(document.getElementById(this._id)); }, // strip off the c and m from the url send...yuck _decodeUrl: function(querystring) { //opera 7 is too stupid to do a relative url...go figure var url = unescape(location.href); url = url.substring(0, url.lastIndexOf("/") + 1); var item = querystring.split('?'); //rip off any path info and append to path above <- relative paths (../) WILL screw this this._url = url + item[0].substring(item[0].lastIndexOf("/") + 1,item[0].length); if(item[1]) { item = item[1].split('&'); for (i in item) { var v = item[i].split('='); if (v[0] == 'c') { this._phpclass = v[1]; } else if (v[0] == 'm') { this._phpmethod = v[1]; } } } if (!this._phpclass || !this._phpmethod) { var cloc = window.location.href; this._url = cloc + (cloc.indexOf('?') >= 0 ? '&' : '?') + 'px=' + escape(HTML_AJAX_Util.absoluteURL(querystring)); } }}⌨️ 快捷键说明
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