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html What does the optgroup label mean? Regarding the usage and attribute instance analysis of the html optgroup tag, this article introduces the definition and attribute examples of the html optgroup tag, as well as the usage of the html optgroup tag
html optgroup tag Definition and usage:
5b7a15bed8615d1b843806256bebea72 tag defines an option group.
The optgroup element is used to group options. When you work with a long list of options, grouping related options can make things easier.
HTML 5b7a15bed8615d1b843806256bebea72 tag example:
Group related options together through the 5b7a15bed8615d1b843806256bebea72 tag:
<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>
Required attributes of the html optgroup label:
label: text: Specifies a description for the option group. (Example above)
html Optional attributes of the optgroup tag:
disabled: disabled: Specifies that the option group is disabled.
HTML 5b7a15bed8615d1b843806256bebea72 The disabled attribute of the tag
The disabled attribute definition of the optgroup tag:
The disabled attribute stipulates that it is disabled This option group. Disabled option groups are neither available nor clickable.
You can set the disabled attribute to restore the user's use of the option group until certain conditions are met (such as selecting a check box). You can then use JavaScript to clear the disabled attribute so that the option group becomes available.
Disabled attribute example of optgroup tag
A disabled option group:
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<select> <optgroup label="German Cars" disabled="disabled"> <option value="mercedes">Mercedes</option> <option value="audi">Audi</option> </optgroup> </select>
html The usage of the optgroup tag is grouped, read-only and displayed in a tree style:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>optgroup</title> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="this is my page"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body> <select> <optgroup label="Java"> <option value="jsp Servlet">jsp Servlet</option> <option value="javaEE">javaEE</option> </optgroup> <optgroup label=".Net"> <option value="aspx">aspx</option> <option value="C#">C#</option> </optgroup> </select> </body> </html>
Browser support
All major browsers support the 5b7a15bed8615d1b843806256bebea72 tag.Global attributes
The5b7a15bed8615d1b843806256bebea72 tag supports global attributes in HTML.Event Attributes
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