jquery - Get height ul first -

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i´m using $(this).find("ul").filter(":first").height(); first ul.

but height not defined, height -20

my ul:

ul style="width: 252px; min-width: 820px; padding-bottom: 20px;" class="jqx-tree-dropdown-root"

best regards.

i created quick jsfiddle displays rather code should work fine. using "this" incorrectly :)

https://jsfiddle.net/qoxub22u/

html mockup 

<div class="container">   <h5>first 1 has height of 40px</h5>   <ul style="height:40px">     <li>test</li>     <li>test1</li>   </ul>    <h5>second 1 has height of 70px</h5>   <ul style="height:70px">     <li>test</li>     <li>test1</li>     <li>test2</li>     <li>test3</li>   </ul> </div> <button id="submit">get height</button>

jquery part 

$( "#submit" ).click(function() {      /* replace .container ur selector */   var height = $('.container').find("ul").filter(":first").height();    alert(height); });

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