Примеры для jQuery .triggerHandler()

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If you called .triggerHandler() on a focus event - the browser's default focus action would not be triggered, only the event handlers bound to the focus event.

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<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>triggerHandler demo</title>
  <script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
 
<button id="old">.trigger( "focus" )</button>
<button id="new">.triggerHandler( "focus" )</button><br><br>
 
<input type="text" value="To Be Focused">
 
<script>
$( "#old" ).click(function() {
  $( "input" ).trigger( "focus" );
});
$( "#new" ).click(function() {
  $( "input" ).triggerHandler( "focus" );
});
$( "input" ).focus(function() {
  $( "<span>Focused!</span>" ).appendTo( "body" ).fadeOut( 1000 );
});
</script>
 
</body>
</html>

Демонстрация: