Unique Ids for Collections Items

1 - Add this to your head in custom code.
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<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
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2 - Add a number field to collection items called unique id number. Make sure that each collection item has a unique number in this field.
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3 - Add a collection list to your page (skip if you already have your collections list).
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4 - Create a paragraph element in your collection item and give it a class of ‘idtext’.
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5 - Link that paragraph element so it gets text from the unique id number field and change the display to none.
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6 - Add this code to an embed element or in custom code settings.
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<script>$(document).ready(function(){ $('.w-dyn-item').each(function() {$(this).attr('id', 'item-'+ $(this).children('.idtext').text().trim());console.log("Unique Ids added");});  });</script>

done.
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Ids will be ‘item-UNIQUE ID NUMBER’

*Make sure that the 'idtext' element is always left as a direct child of the collection item*