The .one() method is identical to .on(), except that the handler is unbound after its first invocation. For example:
$( "#foo" ).one( "click", function() {
alert( "This will be displayed only once." );
});After the code is executed, a click on the element with ID foo will display the alert. Subsequent clicks will do nothing. This code is equivalent to:
$( "#foo" ).on( "click", function( event ) {
alert( "This will be displayed only once." );
$( this ).off( event );
});In other words, explicitly calling .off() from within a regularly-bound handler has exactly the same effect.
If the first argument contains more than one space-separated event types, the event handler is called once for each event type.
A string containing one or more JavaScript event types, such as "click" or "submit," or custom event names.
An object containing data that will be passed to the event handler.
A function to execute at the time the event is triggered.
One or more space-separated event types and optional namespaces, such as "click" or "keydown.myPlugin".
A selector string to filter the descendants of the selected elements that trigger the event. If the selector is null or omitted, the event is always triggered when it reaches the selected element.
Data to be passed to the handler in event.data when an event is triggered.
A function to execute when the event is triggered. The value false is also allowed as a shorthand for a function that simply does return false.
An object in which the string keys represent one or more space-separated event types and optional namespaces, and the values represent a handler function to be called for the event(s).
A selector string to filter the descendants of the selected elements that will call the handler. If the selector is null or omitted, the handler is always called when it reaches the selected element.
Data to be passed to the handler in event.data when an event occurs.
Tie a one-time click to each div.
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>one demo</title>
<style>
div {
width: 60px;
height: 60px;
margin: 5px;
float: left;
background: green;
border: 10px outset;
cursor:pointer;
}
p {
color: red;
margin: 0;
clear: left;
}
</style>
<script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<p>Click a green square...</p>
<script>
var n = 0;
$( "div" ).one( "click", function() {
var index = $( "div" ).index( this );
$( this ).css({
borderStyle: "inset",
cursor: "auto"
});
$( "p" ).text( "Div at index #" + index + " clicked." +
" That's " + (++n) + " total clicks." );
});
</script>
</body>
</html>
To display the text of all paragraphs in an alert box the first time each of them is clicked:
$( "p" ).one( "click", function() {
alert( $( this ).text() );
});
Event handlers will trigger once per element per event type
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>one demo</title>
<script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
<div class="count">0</div>
<div class="target">Hover/click me</div>
<script>
var n = 0;
$(".target").one("click mouseenter", function() {
$(".count").html(++n);
});
</script>
</body>
</html>
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