jQuery filter() Method

The filter() method in jQuery is used to filter a set of elements based on a specified criteria, and it constructs a new jQuery object containing the elements that match the criteria.

Syntax
$(selector).filter(criteria,function(index))

Here's a breakdown of how it works:

Selection

You start with a jQuery object that contains a set of DOM elements. This can be a selection of all elements of a certain type, class, or any other criteria.

Filter Criteria

You specify a filter criteria using the filter() method. This criteria can be defined as a function or a selector.

As a Function

You can provide a callback function that takes an index and the current element as arguments. The function should return true for elements that should be included in the filtered set and false for elements that should be excluded.

var $filtered = $("p").filter(function(index) { return $(this).hasClass("highlighted"); });

As a Selector

You can also provide a selector string, which filters elements based on the selector.

var $filtered = $("p").filter(".highlighted");

Filtered Set

The filter() method constructs a new jQuery object containing only the elements that match the specified criteria. Elements that do not match are removed from the selection.

Result

You can then work with the filtered set of elements, applying further methods or operations as needed.

All filters begin with a colon, such as :first, :last, :even.

$('li').filter(':odd').css('color', 'Blue');
<ul> <li>One</li> <li>Two</li> <li>Three</li> <li>Four</li> </ul>
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<!DOCTYPE html> <html lang="en"> <head> <title>jQuery filter() method</title> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script type="text/javascript"> $(document).ready(function(){ $('li').filter(':odd').css('color', 'Blue'); }); </script> </head> <body> <ul> <li>One</li> <li>Two</li> <li>Three</li> <li>Four</li> </ul> </body> </html>

jQuery filter with Examples

jQuery provides several filters such as :first, :last, :eq() etc. The short list of filter elements below that you can use to narrow down the search for elements in a DOM tree.

  1. :first - First matched element of the selector's returned set.

  2. :last - Last and single instance of the element matching the selector's returned set.

  3. :even - Even elements with a zero-based index within the matched set.

  4. :odd - Odd elements with zero-based indexing within the matched set.

  5. :eq(index) - Element that is equal to the given index n within the matched set.

  6. :gt(index) - All elements that are greater than the given zero-based index within the matched set.

  7. :lt(index) - All elements that are less than the given zero-based index within the matched set.

  8. :animated - All elements that are currently being animated at the time the selector is run.

  9. :header - All header elements (H1...H6).

  10. :not - All elements that do not match the given selector.

  11. :checkbox - All elements that match the type checkbox.

  12. :contains(text) - String of text (case sensitive).

  13. :disabled - All elements that are disabled.

  14. :enabled - All elements that are enabled.

  15. :file - All elements of a certain file type.

jQuery :first example

$( "li:first" ).css( "background-color", "blue" );

jQuery :last example

$( "li:last" ).css( "background-color", "red" );

jQuery :even example

$( "li:even" ).css( "font-style", "italic" );

jQuery :odd example

$( "li:odd" ).css( "font-weight", "bold" );

jQuery :eq example

$( "li:eq( 2 )" ).css( "background-color", "pink" );

jQuery :gt example

$( "li:gt(6)" ).css( "text-decoration", "underline" );
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Full Source
<!DOCTYPE html> <html lang="en"> <head> <title>jQuery filter() method</title> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script type="text/javascript"> $(document).ready(function(){ $( "li:first" ).css( "background-color", "blue" ); $( "li:last" ).css( "background-color", "red" ); $( "li:even" ).css( "font-style", "italic" ); $( "li:odd" ).css( "font-weight", "bold" ); $( "li:eq(2)" ).css( "background-color", "pink" ); $( "li:gt(6)" ).css( "text-decoration", "underline" ); }); </script> </head> <body> <ul> <li>One</li> <li>Two</li> <li>Three</li> <li>Four</li> <li>Five</li> <li>Six</li> <li>Seven</li> <li>Eight</li> <li>Nine</li> <li>Tem</li> </ul> </body> </html>

Conclusion

The filter() method is a powerful tool in jQuery for refining and manipulating sets of elements based on specific criteria, making it useful for various DOM manipulation tasks.






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