What is a form in html

In HTML, a form is an area containing form elements. It is mainly used to collect different types of user input and needs to be defined using the form tag. The form element is a control that allows users to enter content in the form. , such as input tag (input), text area (textarea), etc.

The operating environment of this tutorial: Windows 7 system, HTML5 version, Dell G3 computer.

A form is an area containing form elements.

Form elements allow users to enter content in the form, such as text areas, drop-down lists, radio-buttons, checkboxes, etc.

Forms are created through the

tag, where form objects such as form fields, buttons, and other things are placed:

<form>
....
表单元素
....
</form>

Common form elements

1. input input tag

The form tag used in most cases is the input tag ().

<input type="text" >

The element can be changed into multiple forms according to different type attributes.

Value	Description
button	Defines a clickable button (usually the same as JavaScript is used together to launch the script).
checkbox	Define the checkbox.
color	Define the color picker.
date	Define date control (including year, month, day, excluding time).
datetime	Define date and time controls (including year, month, day, hour, minute, second, fraction of a second, based on UTC time zone).
datetime-local	Define date and time controls (including year, month, day, hour, minute, second, fraction of a second, without time zone) .
email	Defines the fields used for e-mail addresses.
file	Define the file selection field and "Browse..." button for file upload.
hidden	Define hidden input fields.
image	Define the image as the submit button.
month	Define month and year controls (without time zone).
number	Defines the field for entering numbers.
password	Define the password field (characters in the field will be masked).
radio	Define radio buttons.
#range	Defines a control for entering numbers where the exact value is not important (such as a slider control).
reset	Define the reset button (reset all form values ​​to default values).
search	Define the text field used to enter the search string.
submit	Define the submit button.
tel	Defines the field for entering a phone number.
text	Default. Defines a single-line text field (default width is 20 characters).
time	Defines a control for entering time (without time zone).
url	Defines the field for entering the URL.
week	Define week and year controls (without time zone).

2. textarea text field

element defines a multi-line input field (text field):

<textarea name="message" rows="10" cols="30">
The cat was playing in the garden.
</textarea>

3. button button

element defines a clickable button:

4. select drop-down list, option option to be selected

## The # element defines the drop-down list, and the element defines the option to be selected.

<select name="cars">
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
<option value="fiat">Fiat</option>
<option value="audi">Audi</option>
</select>

Drop-down lists usually display the first option as the selected option. But predefined options can be defined by adding the selected attribute.

Recommended tutorial: "

html video tutorial"

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