What is jquery three-level linkage?

jQuery three-level linkage is an interactive effect implemented using the jQuery JavaScript library. It is used to create three associated drop-down menus on the Web page to achieve multi-level selection and data filtering. The function is to according to the user selection, dynamically updating the content of the options in the next drop-down menu, thereby achieving data filtering and precise selection.

The operating system of this tutorial: Windows 10 system, jQuery3.6.0 version, Dell G3 computer.

jQuery three-level linkage is an interactive effect implemented using the jQuery JavaScript library. It is used to create three associated drop-down menus (or other form controls) on a Web page to achieve multi-level Selection and data filtering.

Normally, three-level linkage is used to process data with a hierarchical structure, such as province and city selection, classification label selection, etc. Its function is to dynamically update the content of the options in the next drop-down menu based on the user's selection, thereby achieving data filtering and precise selection.

The specific implementation process is as follows:

• The user selects an item in the first drop-down menu.

• Based on the user's selection, the corresponding option content is dynamically generated in the second drop-down menu to facilitate the user's further selection.

• After the user selects an option in the second drop-down menu, relevant option content is generated in the third drop-down menu based on the user's selection again.

In this way, users can select and filter data layer by layer according to their own needs, providing a better user experience and interactivity.

jQuery provides a wealth of DOM operations and event processing methods, making it relatively simple to implement three-level linkage. With the power of jQuery, developers can quickly create dynamic three-level linkage effects and customize and expand them according to needs.

It should be noted that with the development of front-end technology, there are now other front-end frameworks and libraries that can achieve similar three-level linkage effects, such as Vue.js and React.

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