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Thread: Not setInterval() is applicable for scriplet

  1. #1
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    Exclamation Not setInterval() is applicable for scriplet

    Hi Friends,
    I want to display message for every five seonds in Server side using scriplet. For this, i have added below code.

    <html>
    <head>

    <script type="text/javascript">
    setInterval(function(){
    show();
    }, 5000);
    function show(){
    <%
    System.out.println("Five Seconds");
    %>
    }
    </script>
    </head>
    <body>
    </body>
    </html>


    But it is showing the message "Five Seconds" only once at first time. if we put alert() inside show() method, it displays alert message for every 5 seconds.
    i.e.
    <script type="text/javascript">
    setInterval(function(){
    show();
    }, 5000);
    function show(){
    <%
    System.out.println("Five Seconds");
    %>
    }
    </script>



    I don't now the reason. Please help me.


  2. #2
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    Default Re: Not setInterval() is applicable for scriplet

    If you look at .java file generated for the index.jsp file, you can see that scriplets are written as is and the other lines are written to out.write.

    Hence you can see, your println only once.

    public void _jspService(final javax.servlet.http.HttpServletRequest request, final javax.servlet.http.HttpServletResponse response)
    throws java.io.IOException, javax.servlet.ServletException {
    ...................

    out.write("<script type=\"text/javascript\">\r\n");
    out.write("setInterval(function(){\r\n");
    out.write("show();\r\n");
    out.write("}, 5000);\r\n");
    out.write("function show(){ \r\n");

    System.out.println("Five Seconds");

    out.write("\r\n");
    out.write("}\r\n");

    ............
    }

  3. #3
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    Default Re: Not setInterval() is applicable for scriplet

    What is the solution for this problem

    --- Update ---

    Hi Haritha,
    I am from Hyderabad.


    Please solve my problem

  4. #4
    Administrator copeg's Avatar
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    Default Re: Not setInterval() is applicable for scriplet

    First, javascript != java, these are java forums - hence your thread has been moved. Second, javascript is client side, you cannot invoke server side processes unless explicitly done, say through ajax. If you wish to update the client page periodically, then do so using javascript to change the document.

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