This JQuery.when() method in JQuery gives a way to execute callback functions depending on zero or more Thenable objects, which usually are Deferred objects that represent asynchronous events.
Syntax:
jQuery.when(deferreds)
Parameters:
- deferreds: This parameter specifies zero or more Thenable objects.
Return Value: This method returns a Promise.
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>
< html >
< head >
</ script >
</ head >
< body style = "text-align:center;" >
< h1 style = "color:green;" >
GeeksForGeeks
</ h1 >
< p >
JQuery.when() method
</ p >
< button onclick = "Geeks();" >
click here
</ button >
< p id = "GFG_DOWN" >
</ p >
< script >
var def = $.Deferred();
function Geeks() {
$.when().then(function(a) {
alert(
"when() method called this alert()." );
});
}
</ script >
</ body >
</ html >
|
Output:
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>
< html >
< head >
</ script >
</ head >
< body style = "text-align:center;" >
< h1 style = "color:green;" >
GeeksForGeeks
</ h1 >
< p >
JQuery.when() method
</ p >
< button onclick = "Geeks();" >
click here
</ button >
< p id = "GFG_DOWN" >
</ p >
< script >
var def = $.Deferred();
function Geeks() {
$.when(def).done(function (x) {
$('#GFG_DOWN').append(
'when() method is executed.')
});
def.resolve();
}
</ script >
</ body >
</ html >
|
Output:
Last Updated :
16 Jul, 2020
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