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
– Tobias Alt, Commented Jun 30, 2017 at 8:34
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
– Scary Wombat, Commented Jun 30, 2017 at 8:35
I think the html file can load the String from java but the corresponding js not -> did not see it. — Tobias Alt
– Tobias Alt, Commented Jun 30, 2017 at 8:37
In other topics in StackOverflow it says that this works, but nothing works. — DeathGun
– DeathGun, Commented Jun 30, 2017 at 8:37

ItamarG3 · Accepted Answer · 2017-06-30 09:49:36Z

0

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;

edited Jun 30, 2017 at 9:49

ItamarG3

4,1206 gold badges33 silver badges44 bronze badges

answered Jun 30, 2017 at 9:06

Vardaan Popli

12 bronze badges

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