Getting HTML custom data-* attributes from radio buttons on form submit

Question

Is there a way to get the custom HTML data-* attributes for the selected radio button when you submit a form? The value does not seem to get picked up by serializeArray().

HTML

<form id="preference-form">
<table>
<tr class ="result">
    <td width="100%">{{Title}}</td>
    <td><input type="radio" id="radio-{{Project_No}}-1" data-application="{{Application_ID}}" name="{{Project_ID}}" value="1"></td>
    <td><input type="radio" id="radio-{{Project_No}}-2" data-application="{{Application_ID}}" name="{{Project_ID}}" value="2"></td>
    <td><input type="radio" id="radio-{{Project_No}}-3" data-application="{{Application_ID}}" name="{{Project_ID}}" value="3"></td>
    <td><input type="radio" id="radio-{{Project_No}}-9" data-application="{{Application_ID}}" name="{{Project_ID}}" value="9"></td>
</tr>
</table>
</form>

JavaScript

$("#preference-form).on('submit', function() {
    var data = $(this).serializeArray();
    console.log(data)
});

This outputs the name and value fields, but I can't seem to find a simple answer about the data-* fields. Unfortunately, I need all three pieces of information in order to perform an update on the database record, and from what I understand:

• Each ID and Value field has to be unique,
• Each name field has to be identical to group the elements.

I think the tricky part for this is the multiple elements compared to a single element.

Answer 1

Based on comment that all you have is radios; writing your own serializer is simple.

First I would put the data attribute on the <tr> for less repetition

<tr data-application="{{Application_ID}}">

Then you would do something like:

var data = $(this).find('tr:has(:radio:checked)').map(function(){
   var $row=$(this), radio = $row.find(':radio:checked')[0]
   return {
      app: $row.data('application'),
      name: radio.name,
      value: radio.value
   }
}).get()