Hi Felix,

Not sure what content1 and content2 are in your case.
A script like following worked fine for me:

var textFrame = app.selection[0];

alert(textFrame.texts[0].length); // 5
textFrame.texts[0].duplicate(LocationOptions.AT_END, textFrame);
alert(textFrame.texts[0].length); // 10

Regards,
MT

Hello,

MixedInkGroups.add lets you generate multiple mixed inks (from a combination of inks), as done in UI by Swatches > New Mixed Ink Group.

inkList – inks to use to create the mixed inks
inkPercentages – Array of initial percentages for each ink from inkList
repeatValues – Array of repetitions for each ink
incrementValues – Array of increments to use when repeating

For example,
[Proces Cyan, PANTONE 281 C] with percentages [0, 0], repeatValues [2, 2], ad increments [10, 10] would create (2 + 1) x (2 + 1) = 9 mixed inks.

Cyan %, PANTONE 281 C %
(0, 0)
(0, 10)
(0, 20)
(10, 0)
(10, 10)
(10, 20)
(20, 0)
(20, 10)
(20, 20)

Hope this helps.

Regards,
MT

Yes, Math.sign does not exist in ExtendScript.

Math.sign and other such functions, for example String.startsWith, Array.indexOf have been added to newer versions of ECMAScript, and are available in web browsers, but not in ExtendScript.

I tend to use polyfills for such cases.

From https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/sign

if (!Math.sign) {
Math.sign = function(x) {
// If x is NaN, the result is NaN.
// If x is -0, the result is -0.
// If x is +0, the result is +0.
// If x is negative and not -0, the result is -1.
// If x is positive and not +0, the result is +1.
return ((x > 0) – (x < 0)) || +x;
};
}

Add this polyfill, and your code should work fine.

Thanks,
MT