JSFiddle - React, Tailwind, and code Playground

by andrew rowe

HTML

<fieldset>
    <div>
        <label for="two">2</label>
        <input type="checkbox" value="2" id="two" name="number[]">
    </div>
    <div>
        <label for="four">4</label>
        <input type="checkbox" value="4" id="four" name="number[]">
    </div>
    <div>
        <label for="six">6</label>
        <input type="checkbox" value="6" id="six" name="number[]">
    </div>
    <div>
        <label for="eight">8</label>
        <input type="checkbox" value="8" id="eight" name="number[]">
    </div>
</fieldset>
<input id='mmm' />

JavaScript

$('#mmm').val($(':checkbox').map(function () {
    return this.id;
}).get().join() );