This .promise() method in JQuery Returns a Promise object to be observed when certain type actions bounded to the collection, queued or not, are ended.
Syntax:
.promise([type][, target])
- type: This parameter specifies the type of queue which needed to be observed.
- target: This parameter specifies Object onto which the promise methods need to be attached.
Parameters:
Return Value: This method returns a dynamically generated Promise which is resolved once actions bounded to the collection, queued or not, have finished.
There are two examples discussed below:
- Example: In this example, the Deferred() is used to create a new object and after that then() method is called with notify and resolve method.
<!DOCTYPE HTML>Â<html> Â<head>   Â<title>     ÂJQuery.when() method   Â</title> Â</script>Â</head>  Â<bodystyle="text-align:center;">   Â<h1style="color:green"> Â       ÂGeeksForGeeks Â   Â</h1>   Â<pid="GFG_UP">   Â</p>   Â<buttononclick="Geeks();">   Âclick here   Â</button>   Â<pid="GFG_DOWN">   Â</p>   Â<script>       Âvar el_up = document.getElementById("GFG_UP");       Âel_up.innerHTML = "JQuery.when() method";       Âvar def = $.Deferred();       Âfunction Geeks() {           Â$.when().then(function(a) {             Âalert( "when() method called this alert()." );           Â});       Â}    Â</script>Â</body>  Â</html>       ÂOutput:
Before clicking on button:
After clicking on button:
- Example: In this example, the Deferred() method is used and the state of Deferred object is checked.
<!DOCTYPE HTML>Â<html> Â<head>   Â<title>     ÂJQuery.when() method   Â</title></script>Â</head>  Â<bodystyle="text-align:center;">   Â<h1style="color:green"> Â       ÂGeeksForGeeks Â   Â</h1>   Â<pid="GFG_UP">   Â</p>   Â<buttononclick="Geeks();">   Âclick here   Â</button>   Â<pid="GFG_DOWN">   Â</p>   Â<script>       Âvar el_up = document.getElementById("GFG_UP");       Âel_up.innerHTML = "JQuery.when() method";       Âvar def = $.Deferred();       Âfunction Geeks() {           Â$.when(def).done(function (x) {             Â$('#GFG_DOWN').append('when() method is executed.')           Â});           Âdef.resolve();       Â}    Â</script>Â</body>  Â</html>             ÂOutput:
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