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Getting undefined error when using Request.QueryString() to get variuable value

Answer 1

A:

You are mixing ASP.NET server side language with javascript which of course is not possible. Try like this:

function getid() {
    <% if (Request.QueryString("id") != null) { %>
        var id = '<%= Request.QueryString("id") %>';
        document.getElementById(id).style.display = 'block';
    <% } %>
}

If you are not using a server side language you could use the following function to read query string parameters in javascript (taken from here):

function gup(name)
{
    name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
    var regexS = "[\\?&]"+name+"=([^&#]*)";
    var regex = new RegExp( regexS );
    var results = regex.exec( window.location.href );
    if( results == null ) {
        return "";
    } else {
        return results[1];
    }
}

And use like this:

function getid() {
    var id = gup('id');
    if (id != '') {
        document.getElementById(id).style.display = 'block';
    }
}

Darin Dimitrov 2010-08-20 14:10:03

wow! your javascript code for simple HTML worked like a charmyou saved me Darin, thanks a lot :)

Lokesh 2010-08-20 14:19:14

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Getting undefined error when using Request.QueryString() to get variuable value

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