Can someone help me with this code snippet?
<c:set var="cls" value="${myFunction(param)}"/>
.....
<script>
function myFunction(param) {
if(param == true) {
return "aaa";
} else {
return "bbb";
}
}
</script>
However, I am encountering the following error:
org.apache.jasper.el.JspELException: /script.jsp(22,12) '${myFunction()}' Function [:myFunction] not found
Is it possible to achieve what you are attempting?
The simple answer is NO...
Let's explore the reason behind this. Take a clue from JSTL (JavaServer Pages Standard Tag Library).. notice the word 'Server'. Yes.
JSP pages undergo compilation similar to Java files. Once successfully compiled, they are sent as a response which is then rendered by the browser for display.
JavaScript: a client-side programming language where codes are executed by the browser rather than the server.
During compilation of a Jsp file, only the Scriptlet and JSTL parts are considered while the rest of the code (HTML, CSS, JS) is treated as text.
Now, imagine a scenario in your code where the Java compiler encounters myFunc, assuming it must be a method but not finding any reference.
Since Javascript functions can only run on the browser side, Java cannot recognize myFunc, resulting in an unknown variable cls.
This explanation sheds light on how JSP and Server Side processes work together.
So, keeping these factors in mind, brainstorm alternative solutions to tackle your issue.
Happy Coding :)
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