jQuery Traversing - Filtering
The first(), last(), eq(), filter() and not() Methods
The simplest ways to filter elements are using first(), last(), and eq(). These methods help you pick out a particular element from a group of elements based on where it is positioned.
Different ways to filter elements are available. For example, you can use the filter() and not() methods to choose elements that either meet or don't meet specific criteria. These methods help you select the elements you want based on your conditions.
jQuery first() Method
The first() function gives you the initial item from a group of chosen elements.
This example chooses the initial <div> element:
jQuery last() Method
The last() function gives you the final item from the provided elements.
Here's an example that picks the final <div> element:
jQuery eq() method
The eq() function is used to pick out a specific element from a group of elements. It does this by using a position number, which starts from 0, not 1. For instance, if you want to select the second <p> element in a list, you would use an index number of 1.
jQuery filter() Method
The filter() method helps you choose specific things. It takes away the ones that don't fit your choice and gives you the ones that do.
The next example fetches all <p> elements having the class name "intro":
jQuery not() Method
The not() function gives you all the elements that don't fit the specified conditions.
Tip: The not() method does the opposite of the filter() method.
The following example retrieves all <p> elements that lack the "intro" class attribute:
<!DOCTYPE html>
<html>
<head>
<script src="https://code.jquery.com/jquery-3.7.1.js" integrity="sha256-eKhayi8LEQwp4NKxN+CfCh+3qOVUtJn3QNZ0TciWLP4=" crossorigin="anonymous"></script>
<script>
$(document).ready(function() {
$("div").first().css("background-color", "yellow");
});
</script>
</head>
<body>
<h1>Welcome to My Homepage</h1>
<p>This is a paragraph.</p>
<div style="border: 1px solid black;">
<p>A paragraph in a div.</p>
<p>Another paragraph in a div.</p>
</div>
<br>
<div style="border: 1px solid black;">
<p>A paragraph in another div.</p>
<p>Another paragraph in another div.</p>
</div>
<br>
<div style="border: 1px solid black;">
<p>A paragraph in another div.</p>
<p>Another paragraph in another div.</p>
</div>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<script src="https://code.jquery.com/jquery-3.7.1.js" integrity="sha256-eKhayi8LEQwp4NKxN+CfCh+3qOVUtJn3QNZ0TciWLP4=" crossorigin="anonymous"></script>
<script>
$(document).ready(function() {
$("div").last().css("background-color", "yellow");
});
</script>
</head>
<body>
<h1>Welcome to My Homepage</h1>
<p>This is a paragraph.</p>
<div style="border: 1px solid black;">
<p>A paragraph in a div.</p>
<p>Another paragraph in a div.</p>
</div>
<br>
<div style="border: 1px solid black;">
<p>A paragraph in another div.</p>
<p>Another paragraph in another div.</p>
</div>
<br>
<div style="border: 1px solid black;">
<p>A paragraph in another div.</p>
<p>Another paragraph in another div.</p>
</div>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<script src="https://code.jquery.com/jquery-3.7.1.js" integrity="sha256-eKhayi8LEQwp4NKxN+CfCh+3qOVUtJn3QNZ0TciWLP4=" crossorigin="anonymous"></script>
<script>
$(document).ready(function() {
$("p").eq(1).css("background-color", "yellow");
});
</script>
</head>
<body>
<h1>Welcome to My Homepage</h1>
<p>My name is Donald (index 0).</p>
<p>Donald Duck (index 1).</p>
<p>I live in Duckburg (index 2).</p>
<p>My best friend is Mickey (index 3).</p>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<script src="https://code.jquery.com/jquery-3.7.1.js" integrity="sha256-eKhayi8LEQwp4NKxN+CfCh+3qOVUtJn3QNZ0TciWLP4=" crossorigin="anonymous"></script>
<script>
$(document).ready(function() {
$("p").filter(".intro").css("background-color", "yellow");
});
</script>
</head>
<body>
<h1>Welcome to My Homepage</h1>
<p>My name is Donald.</p>
<p class="intro">I live in Duckburg.</p>
<p class="intro">I love Duckburg.</p>
<p>My best friend is Mickey.</p>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<script src="https://code.jquery.com/jquery-3.7.1.js" integrity="sha256-eKhayi8LEQwp4NKxN+CfCh+3qOVUtJn3QNZ0TciWLP4=" crossorigin="anonymous"></script>
<script>
$(document).ready(function() {
$("p").filter(".intro").css("background-color", "yellow");
});
</script>
</head>
<body>
<h1>Welcome to My Homepage</h1>
<p>My name is Donald.</p>
<p class="intro">I live in Duckburg.</p>
<p class="intro">I love Duckburg.</p>
<p>My best friend is Mickey.</p>
</body>
</html>
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