Get a specific variable from an array of objects

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The macro needs an array of object as input. My suggestion is that you get array as a datalayer variable in your website. It picks the assigned variable (in this case ‘id’) and outputs it again like an array: [ ‘123’, ‘456’ ].

Usecase

This is used commonly for ecommerce websites. The information about multiple products is pushed as an array into the datalayer. You want to filter it to send to ViewContent or Purchase tags for example. This macro helps you.

Instructions

Replace the {{var_products_array}} by a GTM variable, which contains an array of information.
Replace ‘id’ in line 28 with the variable name, which is inside the array.

JavaScript

// Gets a specific variable from a array of objects
// Input example:
// [
//   {
//     id: "123",
//     name: "Swimwear blue",
//     brand: "006",
//     variant: "M",
//     price: "79",
//     quantity: "1",
//     list: "/collections/swimwear",
//   },
//   {
//     id: "456",
//     name: "Shorts grey",
//     brand: "009",
//     variant: "XL",
//     price: "79.0",
//     quantity: "1",
//     list: "/collections/shorts",
//   }
// ]
//
// Output example: [ '123', '456' ]

function() {
  var products = {{var_products_array}};
  return products.reduce(function(arr, prod) { return arr.concat(prod.id); }, []);
}

// Notice that 'id' can be replaced with for example 'name'. It depends on the contents of your array you want to pick.

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