jQuery queue()

Introduction

Display the length of a queue in a <span> element:

<!DOCTYPE html>
<html>
<head>
<script 
 src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js">
</script>/*from   w  w w . java2  s.  com*/
<script>
$(document).ready(function(){
  $("button").click(function(){
    let div = $("div");
    div.animate({height: 300}, "slow");
    div.animate({width: 300}, "slow");
    div.animate({height: 100}, "slow");
    div.animate({width: 100}, "slow");

    $("span").text(div.queue().length);
  });
});
</script>
</head>
<body>

<button>Start Animation</button>

<p>The queue length is: <span></span></p>

<div style="width:50px;height:50px;position:absolute;left:10px;top:100px;background-color:red;">
</div>

</body>
</html>

The queue() method returns the queue of functions to be executed on the selected elements.

An element can have several queues.

$(selector).queue(queueName)

Parameter	Optional	Description
`queueName`	Optional.	the name of the queue Default is "fx", the standard effects queue

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