.indexOf is not a function :(

Adding this class worked for me.

Others have pointed out that array.indexOf might not have been implemented in Illustrator's ExtendScript. If you want to use this function, you will have to provide it. I'd like to share a good resource for these scripts: MDN, Mozilla's Developer Network.

Mozilla's Developer Network provide polyfills for functions that are not implemented in every browser. This is handy, because it allows us to use the newest JS functions even if they don't exist in ExtendScript. And it's easier then subscribing to yet another forum.

The array.indexOf function has a polyfill as well on: Array.prototype.indexOf() - JavaScript | MDN

Remember to include it at the START of your script, or (more neat) to include it at the top:

Let me paste the code for this Polyfill.

if (!Array.prototype.indexOf) {
  Array.prototype.indexOf = function indexOf(member, startFrom) {
   /*
  In non-strict mode, if the `this` variable is null or undefined, then it is
  set to the window object. Otherwise, `this` is automatically converted to an
  object. In strict mode, if the `this` variable is null or undefined, a
  `TypeError` is thrown.
  */
   if (this == null) {
   throw new TypeError("Array.prototype.indexOf() - can't convert `" + this + "` to object");
   }

   var
  index = isFinite(startFrom) ? Math.floor(startFrom) : 0,
  that = this instanceof Object ? this : new Object(this),
  length = isFinite(that.length) ? Math.floor(that.length) : 0;

   if (index >= length) {
   return -1;
   }

   if (index < 0) {
  index = Math.max(length + index, 0);
   }

   if (member === undefined) {
   /*
  Since `member` is undefined, keys that don't exist will have the same
  value as `member`, and thus do need to be checked.
  */
   do {
   if (index in that && that[index] === undefined) {
   return index;
   }
   } while (++index < length);
   } else {
   do {
   if (that[index] === member) {
   return index;
   }
   } while (++index < length);
   }

   return -1;
  };
}

This will work..

var fruits = ["Banana", "Orange", "Apple", "Mango"];

var a = fruits.toString().indexOf("Apple");

alert(a);

Just include prototype definitions:

German site, source commends English, download requires registration and login

JavaScriptClassEnhancements for JavaScript Array Class

My bad indeed

Hi,

You have to understand that javascript objects have specific properties and methods. Most of the time you can't call a method of some object A to object B is they don't share this same method (dramatically shortening things here).

In your case, indexOf is a method of a String object while myAlphas is an array. An array object doesn't have a indexOf method, hence your error message.

In short, you are talking wrong to the buddy.

Something like this should work (not tested).

var myAlphas = image.clippingPath.alphaChannelPathNames;
var reg = new RegEx ( "("+["Banana", "Orange", "Apple", "Mango"].join("|")+")$", "");
var n = myAlphas.length;
while ( n-- ) {
  if ( reg.test ( myAlphas ) ) {
  alert( "Gotcha" );
  break;
  }
}