call request.querystring inside javascript function

Question

how to call Request.QueryString inside javascript function and i am using asp.net and C#

var str=<%=Request.quesryString("val")%>

but it is giving me error

Answer 1

If this javascript code is inline in your webform the correct way is to use a javascript serializer:

<script type="text/javascript">
    var str = <%= new JavaScriptSerializer().Serialize(Request.QueryString["val"]) %>;
    alert(str);
</script>

Never do the following, it's completely unsafe and your site vulnerable to XSS injection attacks:

<script type="text/javascript">
    var str = '<%= Request.QueryString["val"] %>';
    alert(str);
</script>