I have the following input <input value="25" data-hidden-value="25" name="associations[agencies][ids][]" data-hidden-name="associations[agencies][ids][]" class="string" type="hidden">

This input is dynamically generated, and don't have any ID. I'm trying to get the value using the following code:

campaignId = $("input[name='associations[agencies][ids][]]'").val(); 

But I always get undefined

Some help please.