jquery query filter

JQuery is a very excellent JavaScript library that provides many convenient methods to make front-end development faster and more efficient. In JQuery, query filtering is one of its most commonly used functions. This article will introduce the relevant parts of JQuery query filtering in detail.

1. Overview

JQuery’s query and filtering mechanism is one of its most important functions. Through filtering, you can easily operate, modify, delete and other operations on HTML elements. JQuery supports filtering through CSS selectors, basic selectors, hierarchical selectors, attribute selectors, form selectors, etc. These features greatly facilitate front-end developers for web development. Basically, JQuery and CSS can be combined in Together you can achieve any powerful dynamic effect.

2. Basic selector

Basic selector refers to the most basic selector and the most commonly used selector. It can select elements by tag name, class name, ID, etc.

Tag Selector:
$("Tag Name")

Class Selector:
$("className")

ID Selector:
$(“#id”)

3. Hierarchical selector

The hierarchical selector can select the parent element, child element, sibling element, etc. of the specified element.

Child element selector:
$("parent > child")

Descendant element selector:
$("ancestor descendant")

Adjacent sibling selector:
$(“prev next”)

All sibling element selector:
$(“prev ~ siblings”)

4. Attribute selector

Attribute selector can select elements through HTML attributes. It supports whether a certain attribute of the element exists, whether the values ​​are equal, etc.

Attribute exists selector:
$("[attribute]")

Attribute value equal selector:
$("[attribute=value]")

The attribute value contains the selector:
$("[attribute*=value]")

The attribute value starts with the specified value selector:
$("[attribute^=value] ”)

The attribute value ends with the specified value selector:
$(“[attribute$=value]”)

5. Form selector

Form selection The browser can easily select form elements, such as input boxes, drop-down boxes, check boxes, radio buttons, etc.

Input selector:
$(“:input”)

Radio button, check box selector:
$(“:checked”)

Drop-down box selector:
$(“:selected”)

6. Filter method

The filter method can filter again after selecting the element to achieve more flexibility and efficiency operation.

First element:
$(“:first”)

Last element:
$(“:last”)

Even elements:
$(“:even”)

Odd elements:
$(“:odd”)

Elements containing conditions:
$(“:contains(text )”)

Visible elements:
$(“:visible”)

Hidden elements:
$(“:hidden”)

7. Summary

Through the above introduction, we can know that JQuery also has a very rich query and filtering function, which can be said to be enough to meet our needs. Of course, in addition to the above methods, there are many other methods to filter out the elements we need. This is also one of the very powerful functions related to JQuery. It is both large and easy to use. It is a front-end development tool for quickly and better display of HTML documents. In order to achieve the user's goal, the JQuery development framework can accurately capture the user's needs, making it very convenient and fast to achieve Web page effects.

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