How to attach an event handler only once?

jQuery offers various event methods for assigning specific event listeners . Normally, jQuery methods will occur as many times as the trigger event is triggered, but when you use jQuery .one() method , the code that attached to only gets executed once per page load.

 
$("selector").one(event,[data],function(eventObject));

The jQuery one() method adds event handlers to the selected element. The handler is executed at most once per element per event type.

 
$("button").one("click", function(){
  alert("Only once");
});

 
<button>Message show only once</button>

Try it Yourself

Full Source

 
<html>
<head>
<title>jQuery events executed only once</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
  $("button").one("click", function(){
    alert("Only once");
  });
});
</script>
</head>
<body>
<button>Message show only once</button>
</body>
</html>

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