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    <p>I'm working in a custom Session class for the ASP.Net framework (both WebForms and MVC flavors).</p> <p>Although very old, this question is very pertinent and I could not find any other addressing the problem given.</p> <p>Hence, I share the solution I coded to ensure a unique and persistent GUID for each window and/or tab, kept static and secured no matter how hard one refreshes, navigates outside the site and returns, cleans the cache, etc.</p> <p>The magic involves <code>window.name</code> and is implemented by the JavaScript code below. The bootstrap is based on jQuery, but easily portable to jQuery-less solutions.</p> <p>Notice that this GUID is automatically appended to any existing <code>form</code>'s providing server-side references.</p> <hr> <p><strong>UIGUID.js</strong></p> <hr> <p><strong>Edited:</strong> the original version presented an error at <code>windowLoadSetGUIDOnForms</code> for <code>formList.length == 1</code> </p> <pre><code>//------------------------------------------------------------------------------ //-- guarantees that window.name is a GUID, and that it would //-- be preserved whilst window life cicle //-- //-- for frames and iframes, the outermost window determines the GUID //-- //-- for every form it will be appended a hidden element of id //-- "this.window.GUID" for server-side references //------------------------------------------------------------------------------ //-- window.name will be set to "GUID-&lt;A_GUID&gt;" //------------------------------------------------------------------------------ //------------------------------------------------------------------------------ //-- Retrieves window GUID, initializing it if necessary ----------------------- //------------------------------------------------------------------------------ function getWindowGUID() { //---------------------------------- var windowGUID = function () { //---------- var S4 = function () { return ( Math.floor( Math.random() * 0x10000 /* 65536 */ ).toString(16) ); }; //---------- return ( S4() + S4() + "-" + S4() + "-" + S4() + "-" + S4() + "-" + S4() + S4() + S4() ); }; //---------------------------------- //-- traverses up in the hierarchy for the outermost window ---------------- var topMostWindow = window; while (topMostWindow != topMostWindow.parent) { topMostWindow = topMostWindow.parent; } //-- initialize GUID if needed --------------------------------------------- if (!topMostWindow.name.match(/^GUID-/)) { topMostWindow.name = "GUID-" + windowGUID(); } //-- return GUID ----------------------------------------------------------- return topMostWindow.name; } //-- getWindowGUID ----------------------------------------------------------- //------------------------------------------------------------------------------ //-- Append via jQuery handlers for windowLoad --------------------------------- //------------------------------------------------------------------------------ $(window).load( function () { windowLoadSetGUID(); windowLoadSetGUIDOnForms(); } ) //---------------------------------------------------------------------------- function windowLoadSetGUID() { var dummy = getWindowGUID(); } //-- windowLoadSetGUID ------------------------------------------------------- function windowLoadSetGUIDOnForms() { var formList = $('form'); var hidGUID = document.createElement("input"); hidGUID.setAttribute("type", "hidden"); hidGUID.setAttribute("name", "this.window.GUID"); hidGUID.setAttribute("value", getWindowGUID()); if (formList.length == 1) { formList.append(hidGUID); } else { for (var i = 0; i &lt; formList.length; ++i) { formList[i].append(hidGUID); } } } //-- windowLoadSetGUIDOnForms ------------------------------------------------ </code></pre> <p>As POC, I devised two HTML scripts demonstrating the uniqueness even at child elements in frames or iFrames</p> <hr> <p><strong>GUIDTest.html</strong></p> <hr> <pre><code>&lt;html&gt; &lt;head&gt; &lt;script language="javascript" type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"&gt;&lt;/script&gt; &lt;script language="javascript" type="text/javascript" src="UIGUID.js"&gt;&lt;/script&gt; &lt;/head&gt; &lt;body onLoad="alert('Main document: ' + getWindowGUID());"&gt; &lt;iframe id="frame001" src="GUIDFrame.html"&gt;&lt;/iframe&gt; &lt;iframe id="frame002" src="GUIDFrame.html"&gt;&lt;/iframe&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <hr> <p><strong>GUIDFrame.html</strong></p> <hr> <pre><code>&lt;html&gt; &lt;head&gt; &lt;script language="javascript" type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"&gt;&lt;/script&gt; &lt;script language="javascript" type="text/javascript" src="UIGUID.js"&gt;&lt;/script&gt; &lt;/head&gt; &lt;body onLoad="alert('iFrame: ' + getWindowGUID());" /&gt; &lt;/html&gt; </code></pre>
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    1. PONeed a Unique ID in javascript for tab windows and for new windows in Internet Explorer
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    1. USMarcus Vinicius Pompeu
    1. USMarcus Vinicius Pompeu
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    1. COAh! Have to say that this works for any current browser... :-)
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