Passing info from JSX file to JS file

[nylam73888815]

Hello,

I'm trying to create a custom panel for PPro. I know this is an After Effects Discussion, but my question seems relatively simple

and this forum is more active.

The script looks for a JSON file in the same location that the project file is saved in using extendscript. It then opens up that JSON file and

returns the data structure to a JS function. Everything works fine, besides the return line in JSX which returns 'undefined'

I've tried the following

return data

return JSON.stringify(data)

encodeURIComponent(JSON.stringify(data)) // I saw this in some examples of PPro Panels

There also seems to be a way to pass info back and forth with XML files, but I cannot figure out how to do that and

have failed to find good example code to follow.

// JSX Script

#include json2.jsx

$.readLyricFile = {

    readlyricsJSON: function() {

        try {      

            file = filePath(app.project.path) + '\\\\lyrics.json';

            data = jsonLoad(file);

        }

        catch(e) {

            data = 'Place Lyrics Here :)'

        }; 

    return encodeURIComponent(JSON.stringify(data));

}  

}

/** Load a data structure stored in a JSON file */

function jsonLoad(jsonFile) {

   var file = new File(jsonFile);

   var currentLine;

   var data = [];

   file.open('r');

   while (!file.eof) {

   currentLine = file.readln();

   data.push(currentLine);

  };

   file.close();

   data = data.join('');

   return JSON.parse(data);

};

// JS Script

/** if lyrics have been place in JSON file, reads JSON file */

function readLyrics() {

  cs = new CSInterface;                  

    data = cs.evalScript('$.readLyricFile.readlyricsJSON()'); // undefiened

    data = JSON.parse(data); // undefined

};

I appreciate any help. Thank You

[Mathias Moehl · Accepted solution]

cs.evalScript

does not return a value.

If I remember correctly it needs a callback like this:

cs.evalScript('$.readLyricFile.readlyricsJSON()', function(result){

  alert("the jsx script returned the value"+result);

});