JSFiddle - React, Tailwind, and code Playground

HTML

<input type='text'></input>
<input type='text' data-foo='fred'></input>
<input type='text' data-foo='barney'></input>

JavaScript

$(document).ready(

function () {
    var textInputs = $(':text');
    alert('found ' + textInputs.length + ' textInputs');

    var datas = textInputs.filter('[data-foo]');
    alert('found ' + datas.length + ' datas');
    
    datas.each(
        function(i, e)
        {
            var data = e.data('foo');
            alert('data[' + i + '] = ' + data);
        });
});