call servlet when radio button is clicked

Question

I want to call servlet when radio button is clicked, how can I make it?

EDIT

I tried to add URL to servlet in javascript function like this

$.post( "ParentManagementServlet", "isActivated");

and like this

 $.post(<%=getServletContext().getContextPath()+"/ParentManagementServlet"%>, "isActivated");

and like this

  $.post("/ParentManagementServlet?isActivated=true");

but both does not call servlet!

here's the url mapping of the servlet in web.xml

<servlet>
    <servlet-name>ParentManagementServlet</servlet-name>
    <servlet-class>ps.iugaza.onlineinfosys.servlets.ParentManagementServlet</servlet-class>
</servlet>
 <servlet-mapping>
    <servlet-name>ParentManagementServlet</servlet-name>
    <url-pattern>/ParentManagementServlet</url-pattern>
</servlet-mapping>

I usually add the servlet through its name, but I read that it's better to get the servlet absolute path form servlet context.

@smas, @Bozho, @Jigar Joshi, I tried to add URL to servlet like this $.post( "ParentManagementServlet", "isActivated"); and like this $.post(<%=getServletContext().getContextPath()+"/ParentManagementServlet"%>, "isActivated"); , but both does not call servlet! — palAlaa, Apr 29 '11 at 13:58
@Alaa: show part with servlet mapping from your web.xml and put your code in question not in comment — lukastymo, Apr 29 '11 at 14:00
$.post(uri, data) - data - must be an object (e.g. $.post("/path/to/your/servlet", { name: "John", time: "2pm" } );) — ninja, Apr 29 '11 at 14:04
@Alaa: you haven't servlet-mapping part in your web.xml. After you add this part test your servlet. Enter URL in browser and check if then it works — lukastymo, Apr 29 '11 at 14:06
@ninja, I make like this ,$.post(<%=getServletContext().getContextPath()+"/ParentManagementServlet"%>, {isActivated:"true"}); , but not working too. — palAlaa, Apr 29 '11 at 14:10
What does Firebug say? What does `success:{}` or `error:{}` handlers of `$.post` say? Is it the URL which returns 404 or is it just the `$.post` which doesn't get called? Please learn how to debug code. What line get executed and what not? What HTTP request get sent and what not? — BalusC, Apr 29 '11 at 14:22
@BlausC,I make alert before this line, it works , and another alert after it, but doesn't work, so ${post} doesn't call the servlet, about fireBug, here's what returns $ is not defined [Break On This Error] $.post("/ParentManagementServlet?isActivated=true"); — palAlaa, Apr 29 '11 at 14:33
@BlausC, Does that happen because I am calling it through js function? — palAlaa, Apr 29 '11 at 14:36
It woooooooooooooooooooooorks I make like this document.location.href = "<%=getServletContext().getContextPath()+"/ParentManagementServlet?isActivated=true"%>"; document.getElementById("stdActivationForm").submit(); — palAlaa, Apr 29 '11 at 14:59
Oh boy.. You were just stabbing and running headlessly around in the dark. Please take time to buy/read a good book/tutorial. By the way, my nickname is BalusC, not BlausC. — BalusC, Apr 29 '11 at 15:33

score 1 · Answer 1 · answered Apr 29 '11 at 13:35

1

Use ajax. For example, with jQuery:

...onclick="invokeServlet()"

function invokeServlet() {
    $.post("/path/to/servlet", params);
}

answered Apr 29 '11 at 13:35

Bozho

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score 1 · Answer 2 · answered Apr 29 '11 at 13:38

To call servlet in time when user select radio (without submit button) use:

Add appropriate mapping to your Servlet - Bind some URL to servlet.
use onselect attribute to call javascript function, which will redirect to the URL

example:

<input type ="radio" Value="blah blah" onSelect="yourFunction()"/>

In other situation the idea is the same: bind Servlet, choose event which will be trigger the servlet

score 1 · Accepted Answer · edited May 23 '17 at 10:24

1

As per the comments:

about fireBug, here's what returns $ is not defined

The $ is definied by jQuery. You've apparently not declared it in your page. jQuery is a JS library and not something already builtin the browser or something.

Put the following line before any other <script> in your <head>

<script src="http://code.jquery.com/jquery-latest.min.js"></script>

(you can of course also download and serve a copy from your own domain)

<script src="jquery-1.5.2.min.js"></script>

call servlet when radio button is clicked

3 Answers3

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