Let's talk about uncommon filtering functions in jquery

In web development, jquery is an excellent JavaScript framework, known and used by almost all front-end developers. The filtering function of jquery brings great convenience and efficiency to web development. However, within the scope of jquery filtering, there are some uncommon filtering functions. This article will start with these filtering functions and explore why they do not fall into the scope of jquery filtering.

First of all, let’s take a look at the basic methods of jquery filtering. In jquery, filtering methods are divided into two categories: basic filtering and hierarchical filtering. Among them, basic filtering is based on element attributes, CSS selectors, sub-elements, etc., such as $("#example div"); while hierarchical filtering is based on the position of the element in the DOM tree, such as $( "#example>div"). On this basis, jquery introduces some filtering functions to further expand the filtering function. These filter functions include: first, :last, :odd, :even, :eq, :gt, :lt, :parent, :has, :not, etc. In addition to enhancing jquery's filtering capabilities, these functions also greatly simplify the work of developers.

However, in addition to these common filter functions, jquery also has many filter functions that are not commonly used in development, or even not used at all. Let’s take a look at these jquery filtering functions that are not commonly used, how they are applied, and why they do not fall into the scope of jquery filtering.

1. Filter the visible area of ​​the element (:visible, :hidden)

These filtering functions filter by the visible (visible) or hidden (hidden) status of the target element. For example: $("div:visible"). Although these filter functions are very practical, they are under the "Basic Filter" category of jquery, not the "Filter Function" category. This is because these functions do not perform logical filtering on elements, but only perform calculations based on the element's CSS properties.

2. Filter the selected form elements (:checked)

This filtering function is also based on the principles of "visible" and "hidden" and is used to filter whether the specified form element is checked. Checked, for example: $(".checkbox:checked"). Similarly, this filter function does not belong to the jquery filter function category.

3. Filter whether the element contains the specified class name (:hasClassName)

This function will filter whether the specified element contains a specific class name, for example: $("div:hasClassName( 'example')"). This filtering function is also based on the DOM structure, rather than filtering through element attributes or CSS selectors, so it does not fall into the category of jquery filtering functions.

4. Filter the value of form elements (:input)

This filtering function will filter elements based on the type of form elements such as input boxes, check boxes, radio boxes, etc. For example: $("form :input"). This filtering function does not filter through CSS selectors or element attributes, but on element types, so it does not fall into the category of jquery filtering functions.

In general, jquery provides many convenient, simple, and efficient filtering methods, allowing front-end developers to operate web pages more effectively. However, beyond the scope of jQuery filtering, there are many more complex and diverse filtering methods, which bring more possibilities to web development. Of course, in specific practice, we need to choose the most appropriate screening method based on specific business needs and development difficulty, and continuously optimize the performance and experience of web pages.

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