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This article mainly explains "how to achieve AJAX to make automatic check form", the content of the article is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in depth, together to study and learn "how to achieve AJAX to make automatic check form" it!

Traditional web pages detect whether the user name is occupied when registering, and the traditional verification is obviously slow and clumsy.

When ajax appeared, the experience changed a lot, because when the user filled out the form, the signed form item was sent to the server, and then the data was queried based on the content filled out by the user. The query number is automatically prompted without a page refresh. Applications like this greatly improve the user experience, and this section briefly introduces the method of making automatic verification forms. The function of ajax is analyzed in principle.

1. Build a framework

The first is the html framework

The copy code is as follows:

Input user name

Enter password

Repeat input

two。 Establish an asynchronous request

When the user enters the user name and starts to enter another form, the background verification is performed as follows:

Input user name

Enter password

Repeat input

Thank you for your reading, the above is the content of "how to achieve AJAX to make an automatic verification form". After the study of this article, I believe you have a deeper understanding of how to achieve AJAX to make an automatic verification form, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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