Assign JavaScript variable to Java Variable in JSP

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Assign JavaScript variable to Java Variable in JSP

posted Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

Assign JavaScript variable to Java Variable in JSP

Ello there,

I'm trying to assign the value of a javascript variable to a java variable. But I don't have clue how to do this? Say for example I have this:

<html>
<head>
   <script type="text/javascript">
       function return variable(){
          var a = "hello";
          return a;
       }
   </script>
</head>
<body>

<%
   //The java code
   String b = //how do I get that javascript variable here?
%>

</body>
</html>

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1 Reply

深蓝 · Answer 1 · 2021-10-16T23:59:28+0000

Java script plays on browser where java code is server side thing so you can't simply do this.

What you can do is submit the calculated variable from javascript to server by form-submission, or using URL parameter or using AJAX calls and then you can make it available on server

HTML

<input type="hidden" id="hiddenField"/>

make sure this fields lays under <form>

Javascript

document.getElementById("hiddenField").value=yourCalculatedVariable;

on server you would get this as a part of request

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Assign JavaScript variable to Java Variable in JSP

Assign JavaScript variable to Java Variable in JSP

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