HTML slt;optgroup.gt; tags
The label is used to group the options provided by the element. W hen you use a longer list of options, combining related options makes processing easier.Put the relevant options together by using the hashtag:
<select>
<optgroup label="Swedish Cars">
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
</optgroup>
<optgroup label="German Cars">
<option value="mercedes">Mercedes</option>
<option value="audi">Audi</option>
</optgroup>
</select>
<optgroup label="Swedish Cars">
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
</optgroup>
<optgroup label="German Cars">
<option value="mercedes">Mercedes</option>
<option value="audi">Audi</option>
</optgroup>
</select>
Try it out . . .
Browser support
Most mainstream browsers support the hashtag.
Label definition and instructions for use
The label is often used to group the relevant options together.
If you have a lot of options combined, you can use the hashtag to easily put the relevant options together.
The difference between HTML 4.01 and HTML5
No.
Property
| 属性 | 值 | 描述 |
|---|---|---|
| disabled | disabled | 规定禁用该选项组。 |
| label | text | 为选项组规定描述。 |
Global properties
The label supports global properties and views the full property sheet HTML global properties.
The event property
The label supports all HTML event properties.