Return variable from javascript into a KM variable

Questions & Suggestions
1

I'm trying to pass a variable from the browser into a KM variable. I've looked at the wiki post to execute JavaScript, but I can't get it to pass the data back to KM.

image
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In the above javascript snippet the browser's console shows that I found the right content. But when I uncomment the return statement Chrome throws an error: Uncaught SyntaxError: Illegal return statement. The text in the window just shows "", indicating that it didn't work.

Any idea what I'm doing wrong? Thank in advance.

2

Just put the value you want to return on the last line of the script. Like this:

image

I know that's not intuitive, and it took me a while to figure it out. But that's apparently the way it works.

3

Another way is to use IIFE (Immediately Invoked Function Expression) [IIFE - MDN Web Docs Glossary: Definitions of Web-related terms | MDN] if one find "return" is easier to read.

(function()  {
   // ....
  return "result"
})();

or 

(() => {
    // ....
    return "result";
})();
1 Like
4

JavaScript's return is only defined inside a function.

( When you just have a sequence of expressions, outside a function context, the last one evaluated is the value you are left with : -)

2 Likes