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Editorial Team
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Asked: 2026-06-12T23:10:46+00:00

Can we initialize JavaScript variables with java in jsp page? like, <script type=text/javascript> var

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Can we initialize JavaScript variables with java in jsp page?
like,

<script type="text/javascript">
var refreshId = setInterval(function() {
    var nv=<% out.print(num_voted); %>;
    var tv=<%out.print(totalvoted); %>;
    var m=<% out.print(month);%>;
    var y=<% out.print(year);%>;
    alert("refreshed");
    $('#alertmessagebox').text("Total members voted "+nv+" out of "+tv+" for "+m+" " +y);
}, 9000);
$.ajaxSetup({ cache: false });
 </script>

Code is not working as expected. 🙁

Is there way to do this? Why it is not possible by this way? shall we need to create header to do this?

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1 Answer

  1. Editorial Team

    Here is an example of setting Javascript variables in a JSP.

    <head>
<%
    String numVotedStr = request.getParameter("numvoted");
    int numVoted = 0;
    if (numVotedStr != null) {
        numVoted = Integer.parseInt(numVotedStr);
    }
%>
<script type="text/javascript">
    function setInterval() {
        alert("hello " + <%= numVoted %>);
    }
</script>
</head>

<body>
<form>
    <input type="button" onclick="setInterval()" value="Press Me"/>
</form>
</body>
</html>

    To test, use the appropriate version of this URL:

    http://localhost:8080/sandbox/example.jsp?numvoted=99

    This will popup an alert box with the integral value of “numvoted” on the HTTP request, by producing an HTML page where the value is initialized in Javascript. (The code should have at least a try-catch for the parseInt() call, but this will serve as simple example.)

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