How to make html form

How to make an HTML form

HTML form is a commonly used interactive method in Web development. It allows users to enter data and submit it to the server for processing. In this article, we will introduce the basic syntax and usage of HTML forms.

Basic syntax of HTML form

The basic syntax of HTML form is as follows:

<form action="url" method="get/post">
    <!-- 表单控件 -->
</form>

Among them, the action attribute specifies the target URL address for form submission, which can be The URL of the current page or the URL of other pages; the method attribute specifies the form submission method, which can be a GET request or a POST request.

Form controls include the following types:

• Text input box: <input type="text" name="..." />
• Password input box: <input type="password" name="..." />
• Radio button: <input type ="radio" name="..." value="..." />
• Check box:<input type="checkbox" name=".. ." value="..." />
• Drop-down list box:<select name="..."><option value="..." >...</option></select>
• Text area: <textarea name="..."></textarea>
• Submit button: <input type="submit" value="Submit" />
• Reset button: <input type=" reset" value="Reset" />

Among them, the name attribute specifies the name of the form control, which needs to be used to obtain the form when used in the background program Data; value attribute specifies the value of the form control. This value will be submitted to the server when the form is submitted.

How to use HTML form

The method of using HTML form is divided into the following steps:

1. Writing HTML code

First , we need to write the HTML code of the form in an HTML file. In the basic syntax above, we have mentioned the control types that may be used in the form. As needed, we can select the control types and add them to the form. In this process, we need to pay attention to the name and properties of the control, which will be used in the background program.

2. Design form layout

When writing HTML form code, we need to carefully design the layout of the form so that users can understand it clearly and easily when using the form. Generally speaking, the layout of the form can be as follows:

• Horizontal layout: Arrange the form controls and labels in the horizontal direction, and use colons or spaces to separate the controls and labels.
• Vertical layout: Arrange form controls and labels vertically, with a label immediately below each control.

The above layout method can be adjusted according to actual needs, but it is necessary to ensure that users can complete operations conveniently and quickly when using the form.

3. Verify form data

In the background program, we need to verify the form data submitted by the user to ensure that the data meets our needs. In order to simplify the writing of validation code, we can use a form validation framework. Commonly used frameworks include HTML5 form validation, jQuery Validation and other frameworks.

4. Processing form data

After the verification is passed, we can obtain the form data through the background program and save it to the database or other places. When processing form data, we need to ensure data security, such as using SQL statements to filter out illegal characters, etc.

HTML Form Notes

When using HTML forms, we need to pay attention to the following:

1. Keep the form simple

The more controls a form contains, the more likely it is for users to make errors. Therefore, we should keep the form simple and include only necessary controls to avoid making users feel cumbersome and boring when filling out the form.

2. Verify the form content

In order to ensure the security and validity of the form data, we need to verify the form content. Form validation should take into account various possible situations, such as null values, illegal characters, character length, etc., to ensure that the data entered by the user meets our requirements.

3. Using the form validation framework

In order to simplify the code writing of form validation, we can use the form validation framework. Commonly used form validation frameworks include HTML5 form validation, jQuery Validation, etc. Using these frameworks can avoid us writing a lot of complex validation code.

Conclusion

HTML form is a commonly used interactive method in web development, which allows users to enter data and submit it to the server for processing. In this article, we introduce the basic syntax and usage of HTML forms, as well as some things to pay attention to. I hope it will be helpful for everyone to understand the concept and use of HTML forms.

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