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Grabbing the Querysting of a URL in Javascript

Posted on 2008-10-20
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Last Modified: 2012-06-21
Hi there I have a javascript call to a reload on my page.

<script type="text/javascript">
parent.location.reload("finish.asp?UserId=")
</script>

I need to append finish.asp in the code above with the UserId from the previous page. I am passing the userId in the URL like this

Response.Redirect("finish3.asp?ID=" & intNewId)

Can anyone help please?
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Question by:MayoorPatel
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4 Comments
 
LVL 7

Expert Comment

by:dctuck
ID: 22758741
You have to manually parse the window.location property to find any query string parameters. Alternatively, if you don't feel like writing all the extra code yourself, there are some javascript libraries already written to do so. Here's an example library:
http://andrewu.co.uk/tools/request/
 
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LVL 15

Expert Comment

by:MMDeveloper
ID: 22758761
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LVL 7

Expert Comment

by:dctuck
ID: 22758880
I've just put together this very basic script - you just need to pass the Querystring parameter name you want to find the value for to the QueryString function, and it will return the value
function QueryString(item) {
    // Get the value of the key/value pair in the document URL
    var href = window.location.search;
    if (href == "") {
        return null;
    }
    href = href.substring(1);
    var items = href.split("&");
    for (var i = 0; i < items.length; i++) {
        var keyValue = items[i].split("=");
        if (keyValue[0] == item) {
            return keyValue[1];
        }
    }
    return null;
}

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Accepted Solution

by:
hielo earned 500 total points
ID: 22760148
>>I am passing the userId in the URL like this: Response.Redirect("finish3.asp?ID=" & intNewId)
OK, then if you already have the id in an asp variable, instead of:
<script type="text/javascript">
parent.location.reload("finish.asp?UserId=") 
</script> 
try:
<script type="text/javascript">
parent.location.href="finish.asp?UserId=<%=intNewId%>&cacheBuster=" + new Date();
</script>

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