How to use `if` condition in JSP and run JavaScript function?

Question

I am trying to make a website using JSP. In the onload event, a JavaScript function should run, in the JSP template for the function, I use an if condition. The goal is to check for a URL parameter and only actually run a function when that parameter is found.

Here is my code:

<script language="javascript">

function raj(){

 <%if (String "contact"=request.getParameter("contact");) %>{


    <% String str=request.getParameter("video"); %>
    var s="<%=str%>";
    alert(s);
    }
}
</script>

What went wrong, and how can I fix it?

Though I don't know JSP (Only javascript and other programming language), as a programmer I think there should not be a semi colom after ("contact")<here> — mehulmpt
– mehulmpt, Commented Oct 19, 2014 at 13:01

Roman C · Accepted Answer · 2014-10-19 14:16:07Z

0

You can't create a variable in if statement. First create a variable then initialize and check it. Don't forget to close if block with }.

<script language="javascript">

function raj(){   
 <%String contact; if ((contact=request.getParameter("contact")) != null) %>{    
    <% String str=request.getParameter("video"); %>
    var s="<%=str%>";
    alert(s);
 <%}%>
}

</script>

answered Oct 19, 2014 at 14:16

Roman C

1

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