In this post, I will show you what is find() method in jQuery with example.
Get the descendants of each element in the current set of matched elements, filtered by a selector, jQuery object, or element.
A descendant is a child, grandchild, great-grandchild, and so on.
The DOM tree: This method traverse downwards along descendants of DOM elements, all the way down to the last descendant. To only traverse a single level down the DOM tree (to return direct children), use the children() method.
Note: The filter parameter is required for the find() method, unlike the rest of the tree traversal methods.
Tip: To return all of the descendant elements, use the “*” selector.
Syntax
Here is the simple syntax to use this method −
selector.find( selector )
<ul class="level-1">
<li class="item-i">I</li>
<li class="item-ii">II
<ul class="level-2">
<li class="item-a">A</li>
<li class="item-b">B
<ul class="level-3">
<li class="item-1">1</li>
<li class="item-2">2</li>
<li class="item-3">3</li>
</ul>
</li>
<li class="item-c">C</li>
</ul>
</li>
<li class="item-iii">III</li>
</ul>
If we begin at item II, we can find list items within it:
$( "li.item-ii" ).find( "li" ).css( "background-color", "red" );The result of this call is a red background on items A, B, 1, 2, 3, and C. Even though item II matches the selector expression, it is not included in the results; only descendants are considered candidates for the match.
Unlike most of the tree traversal methods, the selector expression is required in a call to .find(). If we need to retrieve all of the descendant elements, we can pass in the universal selector '*' to accomplish this.
Selector context is implemented with the .find() method; therefore, $( "li.item-ii" ).find( "li" ) is equivalent to $( "li", "li.item-ii" ).
Example
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>find demo</title>
<script src="https://code.jquery.com/jquery-3.4.1.js"></script>
</head>
<body>
<p><span>Hello</span>, how are you?</p>
<p>Me? I'm <span>good</span>.</p>
<script>
$( "p" ).find( "span" ).css( "color", "red" );
</script>
</body>
</html>Result:
Hello, how are you?
Me? I’m good.
