JSFiddle - React, Tailwind, and code Playground

HTML

<table>
<tr>
<td><div class="form_style">  
<input type="hidden" name="crs" id="crs" value="1">     
<input type="hidden" name="clg" id="clg" value="2">     

    <button id="FormSubmit">Apply Now</button>    
    <img src="images/loading.gif" id="LoadingImage" style="display:none" />     
    </div></td>  
</tr>
<tr>
<td><div class="form_style">  
<input type="hidden" name="crs" id="crs" value="3">     
<input type="hidden" name="clg" id="clg" value="4">     

    <button id="FormSubmit">Apply Now</button>    
    <img src="images/loading.gif" id="LoadingImage" style="display:none" />     
    </div></td>  
</tr>
</table>
<div id="res">

</div>

JavaScript

var data = [];
$("table").find(".form_style input:hidden").each(function(){ 
  data.push(this.id); 
});
    
$("#res").html(JSON.stringify(data));