Common input fields for web forms include text, password, email, number, date, radio boxes, check boxes, file upload, submit buttons and reset buttons. 1. Text input (text) is used to freely enter text content, requiring additional verification; 2. Password input (password) hides user input and is often used with confirmation of passwords; 3. Email input automatically checks the format, mobile adaptation optimization; 4. Number input limits input to numbers and supports setting range and step size; 5. Date selection (date) provides calendar controls to improve experience, but compatibility needs to be considered; 6. Radio box (radio) is used for multi-option radio selection, and the name attribute must be consistent; 7. Checkbox is used for multi-option multiple selection, and data is not passed when not checked; 8. File upload allows users to select files and can limit types; 9. Submit button (submit) triggers form submission and can customize styles; 10. Reset button (reset) clears form content, but the user experience may be poor. Mastering the uses and precautions of these input types can help design more friendly and efficient forms.

There are actually not many common input fields in web forms, but each has its own purpose. If you are doing front-end development or designing forms, it will save you a lot of trouble to figure out the differences and applicable scenarios of these input types.

Text input (text)

This is the most basic input box, and the user can enter any text. For example, name, address, notes, etc. are suitable for use with text types. The browser does not restrict the format of the input content, so you need to rely on JavaScript or the backend to verify it.

• Text content suitable for free input
• No automatic verification, additional processing is required
• The common way to write is <input type="text">

Note: Although it is simple, it should not be used to collect content such as passwords or emails in fixed formats, as it is prone to errors.

Password input (password)

This type of input box is very similar to text, the difference is that the input content will be hidden (displayed as dots or asterisks). Usually used to log in or register pages to protect user privacy.

• The input content is not visible
• Also, no automatic verification is performed, but it is often used in conjunction with the password confirmation box.
• The standard writing method is <input type="password">

Small suggestions: Some websites allow the "display password" function, which can be achieved by dynamically switching type in JS.

Email input (email)

This type is specifically used to collect email addresses. The browser will do some basic format checks, such as the @ and domain name parts must be included.

• Automatic verification of format (but does not guarantee that the email address is real)
• On the mobile side, a keyboard suitable for typing an email may pop up
• The writing method is <input type="email">

Tip: Although the browser will block the obviously wrong format, you still have to verify it again on the backend.

Digital input (number)

Want the user to enter only numbers? The number type does this. It also supports setting minimum, maximum, and step size (such as 0.5 per addition and subtraction).

• Accept digital input only
• Support min, max, step attributes
• Writing is similar to <input type="number" min="1" max="10">

Note: Some browsers will display up and down arrows to adjust the value, but the performance may be different on the phone.

Date selection (date)

If you want the user to choose a date, the date type is very convenient. Most modern browsers will pop up calendar controls to improve the user experience.

• Users can select dates instead of manually entering
• The format is usually YYYY-MM-DD
• The tag is <input type="date">

Reminder: Older browsers may not support it. It is best to prepare an alternative solution, such as using JS plug-in to implement it.

Radio box (radio)

When the user can only select one of multiple options, use radio. They usually appear in groups, and a group of radios with the same name attribute can be mutually exclusive.

• The same group of names should be consistent
• Each option corresponds to a <input type="radio">
• Used with labels often, you can also select it by clicking on the text.

Example: Gender selection, payment method and other scenarios are suitable for radio.

Checkbox

If you allow users to select multiple options, use checkbox. Unlike radio, it can be selected multiple times.

• Each checkbox is independent
• Can be selected individually or unchecked
• The tag is <input type="checkbox">

Note: When submitting the form, the unchecked checkbox will not pass the data. Be careful with the backend logic.

File upload (file)

When users need to upload pictures, documents and other files, they must use the file type. It will provide a button to "select file".

• Allow users to upload files
• You can restrict types, such as <input type="file" accept="image/*">
• When submitting, you need to set the enctype of form to multipart/form-data

Tip: When uploading large files, you should consider server configuration, such as PHP's upload_max_filesize setting.

Submit button (submit)

If you want to submit the form after filling it, you must need a submit type button. After clicking, the data will be sent to the server.

• Trigger form submission action
• You can customize text, such as "Register" and "Login"
• The writing method is <input type="submit" value="提交"> or use <button type="submit"></button>

Tips: Sometimes we use CSS to style it to make it look more beautiful.

Reset button (reset)

If the user wants to clear all inputs and do it again, reset comes in handy. However, many websites are not very useful now because the user experience may not be good.

• Clear form content
• Restore to initial state by default
• The writing method is <input type="reset">

Reminder: Consider it clearly before using it, and users may be very annoying after mistakes.

Basically these commonly used input types. Some types such as color, range, and search also have certain application scenarios, but they are not so common in standard forms. Being familiar with these input types can help you make more appropriate and friendly form designs.

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