JavaScript (in jsp) receive String from Java

Question

Good Morning:

I am having several problems trying to receive a String from Java to JSP (Javascript inside).

Java File

String var = "Hello World!";

JavaScript (inside the JSP):

window.onload = function() { 

    loadData();
};    


function loadData() {

    document.getElementById('paragraph').innerHTML = "<%=var%>";

    alert(matr1); } 
}

But I received org.apache.jasper.JasperException: Cannot compile the class.

The rest of JSP and JavaScript is correct, I am trying only to fill the select with the text received in Java, I read other topics but nothing works.

Any help?

Thanks.

No he tries to call a java String from JavaScript. In Android this works fine with JavaScript Interfaces. — Tobias Alt, Jun 30 '17 at 08:34
how would JS know any thing about this java code ? If it is a servlet you could put it in a session attribute — Scary Wombat, Jun 30 '17 at 08:35
I think the html file can load the String from java but the corresponding js not -> did not see it. — Tobias Alt, Jun 30 '17 at 08:37
In other topics in StackOverflow it says that this works, but nothing works. — DeathGun, Jun 30 '17 at 08:37
I tried this, does not work https://stackoverflow.com/questions/12803341/how-to-pass-a-java-string-to-a-javascript-function-in-a-jsp-page — DeathGun, Jun 30 '17 at 08:38
Does actually your html file load the java String - did you try without js ? — Tobias Alt, Jun 30 '17 at 08:39
So far Wombat is right JS need a session attribute or at least a StringBuilder ! — Tobias Alt, Jun 30 '17 at 08:44
SOLVED, I receive the data from a Mapped and it works. Thanks. — DeathGun, Jun 30 '17 at 08:55
Can you post your full source of the JSP file, that way we can help you further. — Den Isahac, Jun 30 '17 at 08:56

score 0 · Answer 1 · edited Jun 30 '17 at 09:49

The <%= %> or the expression tag is used in jsp as a replacement for out.print() function of java.
You don't need to put double quotes around it to use it in java script, in your case if you have imported the java file into your jsp correctly then i think this should work:

document.getElementById('paragraph').innerHTML = <%=var%>;

Or

try using the variable name directly,

document.getElementById('paragraph').innerHTML = var;

JavaScript (in jsp) receive String from Java

1 Answers1

Or