CODEWITHSUNDEEP
javajsp
mckdi
mckdi

Reputation: 11

Refresh value in <div> in jsp file taken from java class

I'm newbie in java and jsp files. I have an application which is using java class to periodically download data from device and send it to the in jsp file:

<div id="showtime">
            <%
                out.print(download.show[0]); <---- this is public table in java class download
            %>
</div>

Here is my question: is there any method I can use to refresh value in taken from java class without refreshing whole page or reseting session timeout countdown?

Edit: I've tried some solutions with AJAX but it doesn't work, I don't know where I made mistake:

<script>
        function dateup(){
            $.ajax({
                type: "GET",
                url: "${pageContext.request.contextPath}/update",
                success: function(response){
                    $('#showtime').html(response);
                    alert("success");
                },
                error: function () {
                    alert("not success");
                }
            });
        }
</script>

Servlet update:

@WebServlet(name = "update")
public class update extends HttpServlet {


    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        String text = "some text";

        response.setContentType("text/plain");
        response.setCharacterEncoding("UTF-8");
        response.getWriter().write(text);.

    }

}

Mapping:

<servlet>
        <servlet-name>update</servlet-name>
        <servlet-class>servlets.update</servlet-class>
</servlet>
<servlet-mapping>
        <servlet-name>update</servlet-name>
        <url-pattern>/update</url-pattern>
</servlet-mapping>

And I changed <div> to: <div id="showtime"></div>

Button to trigger function: <button onclick="dateup()">press here</button>

But it doesn't work. won't change it's context. This not trigger success function nor error one.

Upvotes: 1

Views: 394

Answers (1)

janik
janik

Reputation: 11

"JSP is a server side technology, which means that if you want to refresh the page you will have to perform a request to the server which will return the new page. It is not possible to just return part of a page through normal JSP mechanisms.

If you want to just refresh a value you will need to use javascript to make an ajax call to the server to get the data you need, and repopulate the value with this data."

Upvotes: 1

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