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I have a javascript that needs to get the &quot;rootID&quot; value from my asp.net code behind file. The problem is that the link dont write out the id, but it writes out &quot;&lt;%=rootId%&gt;&quot;.<br />
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It means, this is the link I get:<br />
add.aspx?id=&lt;%=rootId%&gt;<br />
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The link should be like this:<br />
add.aspx?id=123<br />
<br />
Here is my code:<br />
OnClientClick=&quot;try {window.location('add.aspx<wbr />?id=' + targetEl.id.replace('id','<wbr />').replace<wbr />('root_0',<wbr />'&lt;%=rootId<wbr />%&gt;'));} catch (e) {}&quot;<br />

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I have a javascript that needs to get the "rootID" value from my asp.net code behind file. The problem is that the link dont write out the id, but it writes out "<%=rootId%>".

It means, this is the link I get:
add.aspx?id=<%=rootId%>

The link should be like this:
add.aspx?id=123

Here is my code:
OnClientClick="try {window.location('add.aspx?id=' + targetEl.id.replace('id','').replace('root_0','<%=rootId%>'));} catch (e) {}"


Access Server variable from ASP.NET in javascript

The successor to Active Server Pages, ASP.NET websites utilize the .NET framework to produce dynamic, data and content-driven web applications and services. ASP.NET code can be written using any .NET supported language. As of 2009, ASP.NET can also apply the Model-View-Controller (MVC) pattern to web applications

ASP.NET

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.