Assigning Java variable value to Javascript variable

Question

How to assign a java variable vale to an javascript varible. I have tried the following scripting elements:

<%
double x=23.35;
%>
var temp='<%= x %>';
var temp="<%= x %>";
var temp='${x}';

they returned an output as follows:

<%= x %>
<%= x %>
${x}

You might want to try this - JSP: EL expression is not evaluated. — Bhesh Gurung
– Bhesh Gurung, Commented Apr 20, 2014 at 17:19
I tried your suggestion Bhesh but no change in my output. Actually I am not working on an web application, but calling this jsp file from a java code. I am working on SWT browser for uploading google maps — Shashank Bhagat
– Shashank Bhagat, Commented Apr 20, 2014 at 17:31
Is this in a JSP or in a JS file? Also, have you considered making an AJAX call and returning JSON? — Elliott Frisch
– Elliott Frisch, Commented Apr 20, 2014 at 17:32
It's probably because your java call is in quotations. Try var temp = <%= x %>. If this is a JSP file, the value should be replaced before the JavaScript interpreter gets to it. — rescuecreative
– rescuecreative, Commented Apr 20, 2014 at 17:43
var temp = <%= x %> would not load my google map. it seems that it is not accepting value through that scripting style — Shashank Bhagat
– Shashank Bhagat, Commented Apr 20, 2014 at 17:48

kellzer · Accepted Answer · 2014-04-20 18:19:09Z

1

Try this-it should work. (No '=' needed inside java code).

var temp=<% x %>;
var temp=<% x %>;
var temp=${x};

answered Apr 20, 2014 at 18:19

kellzer

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1 Comment

Shashank Bhagat Over a year ago

without the '=' sign it gives an error. And ${x} does not load my google map means it is not accepting that value.

Dinushika Rathnayake · Accepted Answer · 2021-03-09 10:32:46Z

0

You have tried three ways. I have tried in JSP inside the script tag and below work for me fine except for the third way.

 <% double x = 23.35; %>
    
 var temp = <%=x%>;
 console.log(temp);
 console.log(typeof(temp));

 var temp2 = '<%=x%>';
 console.log(temp2);
 console.log(typeof(temp2));

 var temp3 = "<%=x%>";
 console.log(temp3);
 console.log(typeof(temp3));

The difference is if we assign value to a variable within single quotes or double quotes, it treated as a string otherwise number. If you assign value as <c:set name="x" value="23.35" /> then can access by '${x}'.

answered Mar 9, 2021 at 10:32

Dinushika Rathnayake

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