jQuery callbacks.fired() Method
Last Updated :
10 Jul, 2020
The jQuery callbacks.fired() method is used to check if the callbacks have already been called at least once. This method returns the boolean value.
Syntax:
callbacks.fired()
Parameters: This method does not accept any arguments.
Return Value: This method returns a Boolean value.
Example 1: This example returns true because the fire() method has been called at least once.
<!DOCTYPE HTML>
< html >
< head >
< script src =
</ script >
</ head >
< body style = "text-align:center;" >
< h1 style = "color:green;" >
GeeksForGeeks
</ h1 >
< p >
JQuery | callbacks.fired() method
</ p >
< button onclick = "Geeks();" >
click here
</ button >
< p id = "GFG_DOWN" ></ p >
< script >
var el_down = document.getElementById("GFG_DOWN");
var res = "";
var callbacks = jQuery.Callbacks();
function Geeks() {
// First function to be added to the list
var fun1 = function (val) {
res = res + "This is function 1 and"
+ " value passed is " + val + "< br >";
};
// Adding the function 1
callbacks.add(fun1);
// Calling with "GFG_1"
callbacks.fire("GFG_1");
// Calling callbacks.fired()
// method to get true
el_down.innerHTML = callbacks.fired();
}
</ script >
</ body >
</ html >
|
Output:
Example 2: This example returns false because the fire() method hasn’t been called.
<!DOCTYPE HTML>
< html >
< head >
< script src =
</ script >
</ head >
< body style = "text-align:center;" >
< h1 style = "color:green;" >
GeeksForGeeks
</ h1 >
< p >
JQuery | callbacks.fired() method
</ p >
< button onclick = "Geeks();" >
click here
</ button >
< p id = "GFG_DOWN" ></ p >
< script >
var el_down = document.getElementById("GFG_DOWN");
var res = "";
var callbacks = jQuery.Callbacks();
function Geeks() {
// First function to be added to the list
var fun1 = function (val) {
res = res + "This is function 1 and"
+ " value passed is " + val + "< br >";
};
// Adding the function 1
callbacks.add(fun1);
// Adding again
callbacks.add(fun1);
// Calling callbacks.fired() but
// This time we will get false
el_down.innerHTML = callbacks.fired();
}
</ script >
</ body >
</ html >
|
Output:
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