Do you know how to use the html select tag? Introduction to html select tag attributes

html Do you know how to use the select tag? Introduction to html select tag attributes. The following is an introduction to some usage of html select tags, as well as some introduction to the attributes of html select tags

Definition and usage of html select tags:

select elements can be created Single or multiple choice menu.

The tag in the element defines the options available in the list.

html Attributes of select tag:

##HTML multiple attribute of tag

HTML tag example:

Allow multiple selections in the drop-down list:

<select multiple="multiple" size="2">
  <option value ="volvo">Volvo</option>
  <option value ="saab">Saab</option>
  <option value="opel">Opel</option>
  <option value="audi">Audi</option>
</select>

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html The multiple attribute definition and usage of the select tag:

The multiple attribute specifies that multiple options can be selected at the same time.

Differences in selecting multiple options in different operating systems:

For windows: Hold down the Ctrl button to select multiple options

For Mac: Hold down the command button To select multiple options

Because of the above differences, and because of the need to inform the user that multiple selections are available, a more user-friendly approach is to use checkboxes.

Tip: You can use the multiple attribute with the size attribute to define the number of visible options.

Syntax

<select multiple="value">

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html The attribute value of the multiple attribute of the select tag:

multiple: Specifies that multiple options can be selected at the same time.

HTML

name attribute of tag

HTML tag example:

Drop-down list with name attribute:

<select name="carlist">
  <option value ="volvo">Volvo</option>
  <option value ="saab">Saab</option>
  <option value="opel">Opel</option>
  <option value="audi">Audi</option>
</select>

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html The definition and usage of the name attribute of the select tag

The name attribute specifies the name of the select element. The

name attribute is used to identify the form data after it is submitted to the server, or to reference the form data through JavaScript on the client.

html The syntax of the select tag name attribute:

<select name="value">

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html The attribute value of the select tag name attribute:

name: The name of the drop-down list.

HTML

tag size attribute:

HTML tag example:

The size attribute displays two in the drop-down list Options:

<select size="2">
  <option value ="volvo">Volvo</option>
  <option value ="saab">Saab</option>
  <option value="opel">Opel</option>
  <option value="audi">Audi</option>
</select>

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HTML

The definition and usage of the size attribute of the tag:

The size attribute specifies the number of visible options in the drop-down list.

If the value of the size attribute is greater than 1, but less than the total number of options in the list, the browser will display a scroll bar to indicate that more options can be viewed.

HTMLThe syntax of the tag size attribute:

<select size="value">

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HTMLThe attribute value of the tag size attribute:

number: The number of visible options in the drop-down list.

select tag and its tag elements:

Features (different from other tags under the same parent element)

Function (His characteristics are destined to His role)

Usage scenarios (engineering projects)

How to use it (it needs to be contained under which tags, and which tags need to be used with it)

Answer:

Create a drop-down list

Extension: What are the similarities and differences between select and ul/li? What about tables?

Select your location when registering an account, including birthday

Extension: Now in HTML5, data can be used to implement date selection

The usage method is similar to that of datalist

Extension: Input cannot be achieved when using select. What if you want to achieve both input and selection?

Can the properties of the default options achieve anything interesting?

How to classify the data when the data is complex?

What are the conditions required to "naturally associate" a certain tag element\attribute?

Answer Extension

It is said to be a drop-down list. The function of select is not display, but the interaction between the server background and the user. In essence, the user still has to submit a data, but compared with The input tag pays more attention to user experience.

Often multiple select tags are used together, country-city-region. We can get the user's IP and assign the parameters to the corresponding option tags, and then implement the default selection. National

This actually involves the question of "how do self-taught people verify their learning results?" If the verification method you require is to see a certain label, you can answer the question about this label. Everything you have learned, including the details, is not easy. It is far more difficult than doing a set of questions or answering the four preset questions

The difference between HTML 4.01 and HTML 5

HTML5 adds some new attributes.

Tip: The select element is a form control that can be used to accept user input in a form.

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