Is there a way to incorporate Java variables into a JavaScript function on a JSP page?

I've put together a JSP page:

<%
int num1 = 10;
int num2 = 20;
%>

<script>
function display(){
var data = new google.visualization.DataTable();
data.addColumn('string', 'Category');    
              data.addColumn('number', 'Number');
              data.addRows([
                ['category1', <%= num1 %>], ['category2', <%= num2 %>]]);
}
</script>

An issue arises when trying to use these variables within the JavaScript function.

"num1" cannot be recognized as a variable.

"num2" cannot be identified as a variable.

javascriptjavajsp

Answer №1

To correctly format the data, you can utilize either double or single quotes:

data.addRows([['category1', "<%= value1 %>"], ['category2', "<%= value2 %>"]]);

If preferred, single quotes can be used as follows:

data.addRows([['category1', '<%= value1 %>'], ['category2', '<%= value2 %>']]);

Answer №2

To display your variable, you can follow this format:

"<%=var1%>"

It is recommended to avoid using scriptlets. Instead, consider utilizing a method like jstl. Here's an example:

<c:set name="var1" value="10" />    
<c:set name="var2" value="20" />

Now assign them like this:

var value1 = "${var1}";
var value2 = "${var2}";

You can incorporate them into your function like so:

data.addRows([['cat1', "${var1}"], ['cat2', "${var2}"]]);

If you'd like to learn more about the differences between JSTL and Scriplets, check out this informative article:

Comparing JSTL and JSP Scriptlet Programming

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