jQuery - Chaining
You may link actions/methods together using jQuery.
Chaining allows us to execute many jQuery methods (on the same element) within one line or sentence.
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jQuery Method Chaining
So far we wrote jQuery statements one by one (one after the other).
There is, however, a method known as chaining that allows us to perform several jQuery instructions on the same element one after the other (s).
Tip : This eliminates the need for browsers to search for the same element(s) several times.
An action is chained when it is appended to the preceding action.
Example :- The example below combines the techniques css(), slideUp()
and slideDown() in a single line. The "p1" element will first be changed to red,
then slid up and down.
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>
$(document).ready(function () {
$("#b1").click(function () {
$("#p1").css("color", "red").slideUp(2000).slideDown(2000);
});
});
</script>
</head>
<body>
<p id="p1">jQuery is fun!!</p>
<button id="b1">Click me</button>
</body>
</html> Output
jQuery is fun!!
Tip : The code line might be rather lengthy when chaining. JQuery is not extremely stringent with regard to syntax; you may style it how you like, including line breaks and indentations.
Example 2 :- This also works just fine:
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>
$(document).ready(function () {
$("#b3").click(function () {
$("#p3").css("color", "red")
.slideUp(2000)
.slideDown(2000);
});
});
</script>
</head>
<body>
<p id="p3">jQuery is fun!!</p>
<button id="b3">Click me</button>
</body>
</html> Output :-
jQuery is fun!!
Extra whitespace is removed by jQuery, and the lines above are executed as a single long line of code.
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