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// ----------------------------------------------------------------------------- |
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// IWF - Interactive Website Framework. Javascript library for creating |
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// responsive thin client interfaces. |
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// |
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// Copyright (C) 2005 Brock Weaver brockweaver@gmail.com |
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// |
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// This library is free software; you can redistribute it and/or modify |
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// it under the terms of the GNU Lesser General Public License as published |
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// by the Free Software Foundation; either version 2.1 of the License, or |
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// (at your option) any later version. |
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// |
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// This library is distributed in the hope that it will be useful, but |
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// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
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// License for more details. |
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// |
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// You should have received a copy of the GNU Lesser General Public License |
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// along with this library; if not, write to the Free Software Foundation, |
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// Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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// |
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// Brock Weaver |
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// brockweaver@gmail.com |
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// 1605 NW Maple Pl |
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// Ankeny, IA 50021 |
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// ----------------------------------------------------------------------------- |
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|
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// -------------------------------------------------------------------------- |
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// iwfajax.js |
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// |
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// Thread-safe background xml request via XmlHttpRequest object |
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// |
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// Dependencies: |
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// iwfxml.js |
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// iwfcore.js |
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// iwfgui.js (optional -- pretty progress bar) |
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// |
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// Brock Weaver - brockweaver@sourceforge.net - iwf.sourceforge.net |
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// v 0.1 - 2005-06-05 |
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// Initial release. |
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// -------------------------------------------------------------------------- |
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// Known Issues: |
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// AddToHistory does not work |
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// Iframe not implemented |
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// -------------------------------------------------------------------------- |
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|
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if (!window.iwfGetById || !window.iwfXmlDoc){ |
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iwfLog("IWF Dependency Error: iwfajax.js is dependent upon both iwfcore.js and iwfxml.js, so you *must* reference those files first.\n\nExample:\n\n<script type='text/javascript' src='iwfcore.js'></script>\n<script type='text/javascript' src='iwfxml.js'></script>\n<script type='text/javascript' src='iwfajax.js'></script>", true); |
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} |
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|
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// ----------------------------------- |
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// Begin: AJAX Request and Response |
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// ----------------------------------- |
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|
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function iwfRequest(urlOrForm, targetElementOnResponse, addToHistory, callback){ |
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|
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// we use a javascript feature here called "inner functions" |
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// using these means the local variables retain their values after the outer function |
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// has returned. this is useful for thread safety, so |
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// reassigning the onreadystatechange function doesn't stomp over earlier requests. |
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|
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function iwfBindCallback(){ |
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if (req.readyState == 4) { |
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_iwfOnRequestEnd(); |
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if (req.status == 200 || req.status == 0) { |
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iwfLog('exact response from server:\n\n' + req.responseText); |
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_iwfResponseHandler(req.responseText, localCallback, localTarget); |
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} else { |
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_iwfOnRequestError(req.status, req.statusText, req.responseText); |
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} |
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return; |
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} |
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} |
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|
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// determine how to hit the server... |
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var url = null; |
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var method = 'GET'; |
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var postdata = null; |
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var isFromForm = true; |
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var contentType = 'application/x-www-form-urlencoded'; |
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|
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if (iwfIsString(urlOrForm)){ |
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|
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// if we get here, they either specified the url or the name of the form. |
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// either way, flag so we return nothing. |
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isFromForm = false; |
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|
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var frm = iwfGetForm(urlOrForm); |
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if (!frm){ |
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// is a url. |
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url = urlOrForm; |
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method = 'GET'; |
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postdata = null; |
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} else { |
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// is name of a form. |
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// fill with the form object. |
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urlOrForm = frm; |
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} |
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|
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} |
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|
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// use a local variable to hold our callback and target until the inner function is called... |
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var localCallback = callback; |
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var localTarget = targetElementOnResponse; |
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|
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if (!iwfIsString(urlOrForm)){ |
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|
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var ctl = null; |
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|
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|
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// is a form or a control in the form. |
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if (iwfExists(urlOrForm.form)){ |
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// is a control in the form. jump up to the form. |
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ctl = urlOrForm; |
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urlOrForm = urlOrForm.form; |
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} |
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|
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|
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// if they passed a form and no local target, lookup the form.iwfTarget attribute and use it if possible |
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if (!localTarget){ |
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localTarget = iwfAttribute(urlOrForm, 'iwfTarget'); |
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} |
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|
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if (localTarget){ |
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var elTgt = iwfGetOrCreateWithinForm(urlOrForm, 'iwfTarget', 'input', 'hidden'); |
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if (elTgt){ |
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iwfAttribute(elTgt, 'value', localTarget); |
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iwfRemoveAttribute(elTgt, 'disabled'); |
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} |
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} |
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|
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|
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url = urlOrForm.action; |
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method = urlOrForm.method.toUpperCase(); |
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switch(method){ |
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case "POST": |
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postdata = _iwfGetFormData(urlOrForm, url, ctl); |
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|
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// we also need to properly set the content-type header... |
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var frm = iwfGetForm(urlOrForm); |
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if (frm){ |
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var enc = iwfAttribute(frm, 'encoding'); |
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if (!enc){ |
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enc = iwfAttribute(frm, 'enctype'); |
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} |
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if (enc){ |
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contentType = enc; |
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} |
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} |
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|
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break; |
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case "GET": |
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default: |
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url = _iwfGetFormData(urlOrForm, url, ctl); |
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break; |
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} |
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} |
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|
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// prevent any browser caching of our url by requesting a unique url everytime... |
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url += ((url.indexOf('?') > -1) ? '&' : '?') + 'iwfRequestId=' + new Date().valueOf(); |
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|
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iwfLog("url = " + url); |
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iwfLog("method = " + method); |
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iwfLog("postdata = " + postdata); |
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iwfLog("contenttype = " + contentType); |
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|
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|
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var req = null; |
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if (!addToHistory){ |
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iwfLog("using XHR to perform request..."); |
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// use XHR to perform the request, as this will |
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// prevent the browser from adding it to history. |
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req = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP"); |
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|
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// bind our callback |
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req.onreadystatechange = iwfBindCallback; |
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|
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// show progress if it's not already visible... |
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_iwfOnRequestStart(); |
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|
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// hit the server |
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req.open(method, url, true); |
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req.setRequestHeader('Content-Type', contentType); |
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req.send(postdata); |
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} else { |
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// use an IFRAME element to perform the request, |
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// as this will cause the browser to add it to history. |
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// TODO: make this work!!! |
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iwfLog("using IFRAME to perform request..."); |
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iwfLog('request and add to history not implemented yet!!!', true); |
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return; |
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|
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var el = iwfGetById("iwfHistoryFrame"); |
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if (!el){ |
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iwfLog("To enable history tracking in IWF, you must add an invisible IFRAME element to your page:\n<IFRAME id='iwfHistoryFrame' style='display:none'></IFRAME>", true); |
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} |
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|
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el.src = url; |
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|
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// show progress if it's not already visible... |
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_iwfOnRequestStart(); |
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|
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|
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} |
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|
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// if this is called from the form.onsubmit event, make sure the form doesn't submit... |
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|
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if (isFromForm){ |
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return false; |
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} else { |
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// return absolutely nothing so anchor tags don't hork the current page |
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} |
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|
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} |
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|
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function _iwfGetFormData(form, url, ctl){ |
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|
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var method = form.method; |
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if (!method) method = "get"; |
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|
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var output = null; |
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|
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if (method == 'get'){ |
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output = url + ((url.indexOf('?') > -1) ? '&' : '?'); |
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} else { |
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output = ''; |
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} |
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|
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|
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// if there is a target specified in the <form> tag, |
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// copy its contents to a hidden <input type='hidden'> tag. |
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|
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iwfLog("total elements in form named '" + form.name + "': " + form.elements.length); |
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for(var i=0;i<form.elements.length;i++){ |
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var el = form.elements[i]; |
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var nm = iwfAttribute(el, 'name'); |
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var val = null; |
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if (!iwfAttribute(el, 'disabled') && nm){ |
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switch (el.tagName.toLowerCase()){ |
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case 'input': |
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switch(iwfAttribute(el, 'type')){ |
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case 'checkbox': |
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case 'radio': |
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if (iwfAttribute(el, 'checked') || el.checked){ |
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val = iwfAttribute(el, 'value') || el.value; |
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} |
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break; |
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case 'button': |
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if (el == ctl){ |
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val = iwfAttribute(el, 'value'); |
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} |
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break; |
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case 'submit': |
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if (el == ctl){ |
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val = iwfAttribute(el, 'value'); |
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} |
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break; |
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case 'text': |
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default: |
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val = iwfAttribute(el, 'value'); |
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break; |
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case 'file': |
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iwfLog('TODO: implement <input type="file"> in _iwfGetFormData', true); |
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val = iwfAttribute(el, 'value'); |
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break; |
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case 'image': |
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iwfLog('TODO: implement <input type="image"> in _iwfGetFormData', true); |
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val = iwfAttribute(el, 'value'); |
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break; |
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case 'reset': |
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iwfLog('TODO: implement <input type="reset"> in _iwfGetFormData', true); |
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break; |
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case 'hidden': |
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val = iwfAttribute(el, 'value'); |
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break; |
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} |
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break; |
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case 'textarea': |
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val = iwfAttribute(el, 'innerText') || el.value; |
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break; |
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case 'button': |
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if (el == ctl){ |
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val = iwfAttribute(el, 'innerText') || el.value; |
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} |
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break; |
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case 'select': |
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for(var j=0;j<el.options.length;j++){ |
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if (iwfAttribute(el.options[j], 'selected') == 'true'){ |
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if (!val){ |
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val = iwfAttribute(el.options[j], 'value'); |
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} else { |
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val += '+' + iwfAttribute(el.options[j], 'value'); |
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} |
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} |
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} |
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} |
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|
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if (val){ |
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if (output.length > 0){ |
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output += '&'; |
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} |
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output += escape(nm) + '=' + escape(val); |
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} |
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} |
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} |
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if (output.length == 0){ |
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return null; |
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} else { |
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return output; |
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} |
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} |
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|
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function _iwfResponseReceived(doc){ |
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iwfLog('iframeloaded'); |
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var xmlDoc = new iwfXmlDoc(doc.innerHTML); |
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} |
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|
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function _iwfResponseHandler(origText, callback, tgt){ |
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var doc = new iwfXmlDoc(origText); |
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if (!doc.response){ |
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// not in our default xml format. |
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// just throw out the xml to the callback, if any |
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if (callback){ |
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callback(doc); |
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} else { |
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iwfLog("IWF Ajax Error: No callback defined for non-standard response:\n" + origText, true); |
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} |
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} else { |
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if (doc.response.debugging == 'true'){ |
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iwfLoggingEnabled = true; |
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iwfLog("IWF Ajax Debugging:\nParsed response:\n\n" + doc.response.outerXml(true), true); |
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iwfShowLog(); |
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} |
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for(var i=0; i< doc.response.childNodes.length; i++){ |
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var node = doc.response.childNodes[i]; |
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if (node.nodeName.indexOf("#") != 0){ |
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iwfLog('node.target=' + node.target + '\ntgt=' + tgt); |
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if (!tgt) { |
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// server target is ignored if a client target exists. |
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tgt = node.target; |
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} |
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if (node.errorCode && iwfToInt(node.errorCode, true) != 0){ |
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// an error occurred. |
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_iwfOnRequestError(node.errorCode, node.errorMessage); |
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} else { |
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if (!node.type){ |
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node.type = ""; |
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} |
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switch(node.type.toLowerCase()){ |
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case "html": |
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case "xhtml": |
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var innerHtml = node.innerHtml(); |
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//iwfLog('parsed html response:\n\n' + innerHtml); |
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_iwfInsertHtml(innerHtml, tgt); |
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break; |
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case "javascript": |
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case "js": |
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var bomb = true; |
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if (node.childNodes.length == 1){ |
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var js = node.childNodes[0]; |
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if (js.nodeName == '#cdata' || js.nodeName == '#comment'){ |
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bomb = false; |
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var code = js.getText(); |
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eval(code); |
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} |
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} |
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if (bomb){ |
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iwfLog("IWF Ajax Error: When an <action> is defined of type javascript, it content must be contained by either a Comment (<!-- -->) or CDATA (<![CDATA[ ]]>).\nCDATA is the more appropriate manner, as this is the xml-compliant one.\nHowever, COMMENT is also allowed as this is html-compliant, such as within a <script> element.\n\n<action> xml returned:\n\n" + node.outerXml(), true); |
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} |
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break; |
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case "xml": |
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if (callback){ |
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callback(node); |
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} |
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break; |
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case "debug": |
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iwfLog("IWF Debug: <action> type identified as 'debug'.\nXml received for current action:\n\n" + node.outerXml(), true); |
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break; |
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default: |
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iwfLog('IWF Ajax Error: <action> type of "' + node.type + '" is not a valid option.\n\nValid options:\n\'html\' or \'xhtml\' = parse as html and inject into element with the id specified by the target attribute\n\'javascript\' or \'js\' = parse as javascript and execute\n\'xml\' = parse as xml and call the callback specified when iwfRequest() was called\n\'debug\' = parse as xml and log/alert the result\n\n<action> xml returned:\n\n' + node.outerXml(), true); |
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break; |
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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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} |
| 388 |
|
| 389 |
function _iwfInsertHtml(html, parentNodeId){ |
| 390 |
if(!parentNodeId){ |
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parentNodeId = 'iwfContent'; |
| 392 |
iwfLog("IWF Ajax Warning: <action> with a type of 'html' does not have its target attribute specified, so using the default of 'iwfContent'."); |
| 393 |
} |
| 394 |
|
| 395 |
if(!parentNodeId){ |
| 396 |
iwfLog("IWF Ajax Error: <action> node with a type of 'html' does not have its target attribute specified to a valid element.\nPlease specify the id of the element into which the contents of the <action> node should be placed.\nTo fill the entire page, simply specify 'body'.", true); |
| 397 |
} else { |
| 398 |
var el = iwfGetById(parentNodeId); |
| 399 |
if (!el){ |
| 400 |
if (parentNodeId == 'body'){ |
| 401 |
el = iwfGetByTagName('body'); |
| 402 |
if (!el || el.length == 0){ |
| 403 |
iwfLog("IWF Ajax Error: Could not locate the tag named 'body'", true); |
| 404 |
return; |
| 405 |
} else { |
| 406 |
el = el[0]; |
| 407 |
} |
| 408 |
} else { |
| 409 |
iwfLog('IWF Ajax Error: Could not locate element with id of ' + parentNodeId + ' into which the following html should be placed:\n\n' + html, true); |
| 410 |
return; |
| 411 |
} |
| 412 |
} |
| 413 |
|
| 414 |
//iwfLog(iwfElementToString(el)); |
| 415 |
//iwfLog(html); |
| 416 |
|
| 417 |
// trying to shove a <form> node inside another <form> node is a bad thing. |
| 418 |
// make sure we don't do that here. |
| 419 |
var re = /<form/i; |
| 420 |
var match = re.exec(html); |
| 421 |
if (match && document.forms.length > 0){ |
| 422 |
// our html to inject contains a form node. |
| 423 |
// bubble up the chain until we find a <form> node, or we have no parents |
| 424 |
var elParent = el; |
| 425 |
while (elParent && elParent.tagName.toLowerCase() != 'form'){ |
| 426 |
elParent = iwfGetParent(elParent); |
| 427 |
} |
| 428 |
|
| 429 |
if (elParent && elParent.tagName.toLowerCase() == 'form'){ |
| 430 |
iwfLog('IWF Ajax Error: Attempting to inject html which contains a <form> node into a target element which is itself a <form> node, or is already contained by a <form> node.\nThis is bad html, and will not work appropriately on some major browsers.', true); |
| 431 |
} |
| 432 |
} |
| 433 |
|
| 434 |
|
| 435 |
el.innerHTML = html; |
| 436 |
|
| 437 |
|
| 438 |
// if there is a script element, we have to explicitly add it to the body element, |
| 439 |
// as IE and firefox just don't like it when you try to add it as part of the innerHTML |
| 440 |
// property. Go figure. |
| 441 |
|
| 442 |
var i = 0; |
| 443 |
// don't stomp on any existing scripts... |
| 444 |
while (iwfGetById('iwfScript' + i)){ |
| 445 |
i++; |
| 446 |
} |
| 447 |
|
| 448 |
var scriptStart = html.indexOf("<script"); |
| 449 |
while(scriptStart > -1){ |
| 450 |
scriptStart = html.indexOf(">", scriptStart) + 1; |
| 451 |
|
| 452 |
// copy contents of script into a default holder |
| 453 |
var scriptEnd = html.indexOf("</script>", scriptStart); |
| 454 |
var scriptHtml = html.substr(scriptStart, scriptEnd - scriptStart); |
| 455 |
|
| 456 |
var re = /^\s*<!--/; |
| 457 |
var match = re.exec(scriptHtml); |
| 458 |
if (!match){ |
| 459 |
iwfLog("IWF Ajax Error: Developer, you *must* put the <!-- and //--> 'safety net' around your script within all <script> tags.\nThe offending <script> tag contains the following code:\n\n" + scriptHtml + "\n\nThis requirement is due to how IWF injects the html so the browser is able to actually parse the script and make its contents available for execution.", true); |
| 460 |
} |
| 461 |
|
| 462 |
// this code is the worst hack in this entire framework. |
| 463 |
// the code in the try portion should work anywhere -- but |
| 464 |
// ie barfs when you try to set the innerHTML on a script element. |
| 465 |
// not only that, but ie won't parse script unless a visible element |
| 466 |
// is contained in the innerHTML when it is set, so we need the <code>ie hack here</code> |
| 467 |
// and it cannot be removed. |
| 468 |
// I don't understand why creating a new node and setting its innerHTML causes the browsers |
| 469 |
// to parse and execute the script, but it does. |
| 470 |
// Note there is a major leak here, as we do not try to reuse existing iwfScriptXXXX elements |
| 471 |
// in case they are in use by other targets. To clean these up, simply call iwfCleanScripts |
| 472 |
// periodically. This is so app-dependent, I didn't want to try to keep track of everything |
| 473 |
// and possibly miss a case, causing really weird results that only show up occassionally. |
| 474 |
// |
| 475 |
// Plus I'm getting lazy. :) |
| 476 |
// |
| 477 |
try { |
| 478 |
// moz (DOM) |
| 479 |
var elScript = iwfGetOrCreateById('iwfScript' + i, 'script', 'body'); |
| 480 |
elScript.type = 'text/javascript'; |
| 481 |
elScript.defer = 'true'; |
| 482 |
elScript.innerHTML = scriptHtml; |
| 483 |
|
| 484 |
} catch(e){ |
| 485 |
// ie hack -- need a visible tag within a non-script element to have scripting apply... Don't ask me why, ask the IE team why... |
| 486 |
var elDiv = iwfGetOrCreateById('iwfScript' + i, '<div style="display:none"></div>', 'body'); |
| 487 |
elDiv.innerHTML = '<code>ie hack here</code><script id="iwfScript' + i + '" defer="true">' + scriptHtml + '</script' + '>'; |
| 488 |
} |
| 489 |
|
| 490 |
i++; |
| 491 |
|
| 492 |
scriptStart = html.indexOf("<script", scriptEnd+8); |
| 493 |
} |
| 494 |
} |
| 495 |
} |
| 496 |
|
| 497 |
function iwfCleanScripts(){ |
| 498 |
var i = 0; |
| 499 |
while((el = iwfGetById('iwfScript' + i))){ |
| 500 |
iwfRemoveNode(el); |
| 501 |
i++; |
| 502 |
} |
| 503 |
} |
| 504 |
|
| 505 |
|
| 506 |
|
| 507 |
var _iwfTotalRequests = 0; |
| 508 |
var _iwfPendingRequests = 0; |
| 509 |
var _iwfRequestTicker = null; |
| 510 |
var _iwfRequestTickCount = 0; |
| 511 |
var _iwfRequestTickDuration = 100; |
| 512 |
function _iwfOnRequestStart(){ |
| 513 |
_iwfPendingRequests++; |
| 514 |
_iwfTotalRequests++; |
| 515 |
|
| 516 |
_iwfRequestTickDuration = 100; |
| 517 |
|
| 518 |
if (!_iwfRequestTicker){ |
| 519 |
_iwfRequestTickCount = 0; |
| 520 |
if (window.iwfOnRequestStart){ |
| 521 |
_iwfRequestTickDuration = iwfOnRequestStart(); |
| 522 |
} else { |
| 523 |
// use default busy implementation... |
| 524 |
// TODO: make this better! |
| 525 |
window.status = 'busy.'; |
| 526 |
} |
| 527 |
if (!_iwfRequestTickDuration){ |
| 528 |
_iwfRequestTickDuration = 100; |
| 529 |
} |
| 530 |
_iwfRequestTicker = setInterval(_iwfOnRequestTick, _iwfRequestTickDuration); |
| 531 |
} |
| 532 |
} |
| 533 |
|
| 534 |
function _iwfOnRequestTick(){ |
| 535 |
_iwfRequestTickCount++; |
| 536 |
if (window.iwfOnRequestTick){ |
| 537 |
iwfOnRequestTick(_iwfRequestTickCount, _iwfRequestTickDuration, _iwfPendingRequests); |
| 538 |
} else if (!window.iwfOnRequestStart) { |
| 539 |
// use default busy implementation... |
| 540 |
// TODO: make this better! |
| 541 |
window.status = 'busy...............................................'.substr(0, (_iwfRequestTickCount % 45) + 5); |
| 542 |
} else { |
| 543 |
// they didn't define a tick function, |
| 544 |
// but they did define a start one, so do nothing. |
| 545 |
} |
| 546 |
} |
| 547 |
|
| 548 |
function _iwfOnRequestEnd(){ |
| 549 |
_iwfPendingRequests--; |
| 550 |
if (_iwfPendingRequests < 1){ |
| 551 |
_iwfPendingRequests = 0; |
| 552 |
_iwfTotalRequests = 0; |
| 553 |
clearInterval(_iwfRequestTicker); |
| 554 |
_iwfRequestTicker = null; |
| 555 |
if (window.iwfOnRequestEnd){ |
| 556 |
iwfOnRequestEnd(); |
| 557 |
} else if (!window.iwfOnRequestStart) { |
| 558 |
// use default busy implementation... |
| 559 |
// TODO: make this better! |
| 560 |
window.status = 'done.'; |
| 561 |
} else { |
| 562 |
// they didn't define an end function, |
| 563 |
// but they did define a start one, so do nothing. |
| 564 |
} |
| 565 |
|
| 566 |
} else { |
| 567 |
if (window.iwfOnRequestProgress){ |
| 568 |
iwfOnRequestProgress(_iwfPendingRequests, _iwfTotalRequests); |
| 569 |
} else if (!window.iwfOnRequestStart) { |
| 570 |
// use default busy implementation... |
| 571 |
// TODO: make this better! |
| 572 |
window.status = 'Remaining: ' + _iwfPendingRequests; |
| 573 |
} else { |
| 574 |
// they didn't define an end function, |
| 575 |
// but they did define a start one, so do nothing. |
| 576 |
} |
| 577 |
} |
| 578 |
} |
| 579 |
|
| 580 |
function _iwfOnRequestError(code, msg, text){ |
| 581 |
iwfLog("Error " + code + ": " + msg + ":\n\n" + text); |
| 582 |
if (window.iwfOnRequestError){ |
| 583 |
iwfOnRequestError(code, msg, text); |
| 584 |
} else { |
| 585 |
alert("Error " + code + ": " + msg + ":\n\n" + text); |
| 586 |
} |
| 587 |
} |
| 588 |
|
| 589 |
// ----------------------------------- |
| 590 |
// End: AJAX Request and Response |
| 591 |
// ----------------------------------- |
Parent Directory
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Revision Log