Test overflow of textframe in illustrator

check this script by TenA

text overflow + postFix

This is still a work in progress for myself, but you can check to see if the contents of lines of a text frame all match up with the total text contents of the text frame.

I think my function for the single-line overset has been proved to work most of the time - check it out:

  function isOverset(textBox, lineAmt) {

    if (textBox.lines.length > 0) {

      var charactersOnVisibleLines = 0;

      if(typeof(lineAmt) != "undefined"){

        lineAmt = 1;

      }

      for (var i = 0; i < lineAmt; i++) {

        charactersOnVisibleLines += textBox.lines.characters.length;

      }

      if (charactersOnVisibleLines < textBox.characters.length) {

        return true;

      } else {

        return false;

      }

    } else if (textBox.characters.length > 0) {

      return true;

    }

  };