Tutorial on the use of H5 and CSS3 form validation

This article mainly introduces the use of HTML5 and CSS3 form verification functions. Friends who need it can refer to it

Client-side verification is one of the most commonly used functions of web client programs. We have used various Various js libraries are used for form verification. HTML5 actually already provides us with the form validation function. As for why it hasn’t become popular, it’s probably due to compatibility issues and also because the style is too ugly.

Below we will create an HTML5 and CSS3 form validation step by step, using only HTML and CSS.

The completed one is as follows:

Step 1: Organize the validation fields and types

First we need The following fields:

• Name(full name)

• Phone number(phone number)

• Email address(email address)

• Website(website)

After the user enters some information, we need to verify the user’s information correct to avoid erroneous data and deceptive data being passed to the server.

In the new specifications of HTML5, the input input box provides a variety of input types such as: tel, email, number, range, color, etc. These types are generally not very obvious in desktop clients. If It will be more obvious on the mobile keyboard. For example, number will automatically switch to pure numbers on the mobile keyboard, and the email keyboard will automatically switch to the keyboard with @.

Step 2: Determine the form style

We also need to determine the final style of the form. Generally, this work comes from the designer. Here I found a form style on Dribbble as the demo style this time.

Step 3: Template code

Use standard HTML5 declaration code

Step 4: Create a form

Create a basic form element. Here we do not submit any data, it is just a demonstration, so the form will not be submitted.

Step 5: Create the form element

The form element consists of the following elements:

• ul

• li

• label

• input

• span

ul and li elements are used for typesetting and layout, and are used to separate form elements and layout. label is used for form field prompt text. input is used for users to enter data. span is used to use emoji to prompt the user whether the fields are filled in correctly.

 
 FULL NAME   
 

The form form html code completion code is as follows:

Step 6: Add style

Complete the form When writing elements, focus on improving its style to make it look more beautiful.

body { display: flex; } form { padding: 0 10%; width: 100%; margin: auto; } ul { list-style-type: none; padding: 0; margin: 0; } li { position: relative; margin-bottom: 20px; } label { color: #333; display: block; font-size: 12px; } input { width: 100%; outline: none; border: none; padding: 0.5em 0; font-size: 14px; color: black; position: relative; border-bottom: 1px solid #d4d4d4; } input:-moz-placeholder { color: #d4d4d4; } input::-webkit-input-placeholder { color: #d4d4d4; } li span { display: block; position: absolute; right: 0; top: 10px; font-size: 28px; } button { cursor: pointer; border: 1px solid #999; border-radius: 4px; padding: 10px 20px; margin-top: 10px; background: #fff; }

css code completion code is as follows:

Step 7: Add EMOJI prompt

in each In the form structure, we have added a span tag. For example, in the name field, we have added atag. Now add a style to it to display thestatusof the validation field.

li span { display: block; position: absolute; right: 0; top: 10px; font-size: 28px; } /*默认的是一个微笑的表情*/ li span::before { content: '

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