Question

In my JSP,I have a Java array menuNames ,I want to assign a value from that array to a text area.Here below i mentioned the Javascript code,Please advice me to correct the code..

function setMainMenuURL(index) {

document.getElementById("SelectedURL").value=<%menuNames[index]%>;
}

Answer 1

You’re confusing your Java code (in the JSP) and your JavaScript code. The Java code runs on the server-side, before anything is returned to the browser, and has nothing to do with the JavaScript code. The JavaScript runs on the client-side, in the user’s browser, after the Java code has already run.

What you’re trying to do – which won’t work – is use a JavaScript parameter inside your Java code. Since the Java has already executed, that makes absolutely no sense.

Your best bet would be to print out the Java array as a valid JavaScript array (saving it to a JavaScript variable), then use that in your JavaScript code. Something like this:

var javascriptArrayMenuNames = <%= Java code to output JSON representation of the array %>;
function setMainMenuUrl(index) {
    document.getElementById('SelectedURL').value = javascriptArrayMenuNames[index];
}