JSFiddle - React, Tailwind, and code Playground

HTML

<div class="previewWrapper" id="thumbPreview3">
  <div class="previewContainer">
   <img src="" class="photoPreview" data-width="" data-height=""><span>3</span>
  </div>
</div>
<input type="button" id=click value =" Click me" />

JavaScript

$(function () {

    $("#click").click(function () {

        if ($('div.previewContainer img').attr('src') == '') {
            alert('got me');
        }
    });


});