Use a variable in javascript function inside Java code

Question

I have a javascript function as below.

<script type="text/javascript">
 window.addEventListener ("message", OnMessage, false);
 function OnMessage (event) {
 var test = event.data;
 <%
 ReadCookiesServlet readCookiesServlet=new ReadCookiesServlet();
 readCookiesServlet.doGet(<%=test%>,response);
 %>
 }
</script>

What I actually needs is to pass the value of event.data to the method doGet.How can I pass this value?

Thanks.

• Angelo Immediata: i guess the only way you have is to make a HTTP call to the doGet method....better if an AJAX call
• Everv0id: readCookiesServlet.doGet(<%=test%>,response); wtf dude? you shouldn't call doPost and doGet servlet methods yourself.
• Hasanthi: yep :) Just a sample code. What I need is to use javascript variable inside java code
• Everv0id: So use ajax call. Something like jQuery's $.get will do the work.
• Hasanthi: Everv0id, Im just a newbie for ajax. Can you please help me to use ajax here

Answer 1

You can use ajax

The problem with you approach is that the java code is compiled before any javascript function is created so it doesnt know what test and will pass <%=test%> as a string to function

Btw readCookiesServlet.doGet(<%=test%>,response); will give you a compile time error because test is not defined in java code it is defined in javascript code and also for its type.

• singhakash: @Hasanthi if you find my answer helful consider accepting it
• Hasanthi: Can You please help me to write an ajax call for this
• singhakash: @Hasanthi yes ufcorse check the link in my answer if you find any trouble then let me know.