此标记用于在下拉列表中创建一组相同类别的选项。当存在一个长的项目列表时,
null
<optgroup> <option>..</option> . . </optgroup>
属性:
例1:
html
<!DOCTYPE html> < html > < body > < h1 >GeeksforGeeks</ h1 > < h2 >HTML optgroup Tag</ h2 > < select > <!-- optgroup tag starts --> < optgroup label = "Programming Languages" > < option value = "C" >C</ option > < option value = "C++" >C++</ option > < option value = "Java" >Java</ option > </ optgroup > < optgroup label = "Scripting Language" > < option value = "JavaScript" >JavaScript</ option > < option value = "PHP" >PHP</ option > < option value = "Shell" >Shell</ option > </ optgroup > <!-- optgroup tag ends --> </ select > </ body > </ html > |
输出:
例2:
html
<!DOCTYPE html> < html > < body > < h1 >GeeksforGeeks</ h1 > < h2 >HTML optgroup Tag</ h2 > < select > <!-- optgroup tag starts --> < optgroup label = "Programming Languages" > < option value = "C" >C</ option > < option value = "C++" >C++</ option > < option value = "Java" >Java</ option > </ optgroup > < optgroup label = "Scripting Language" disabled> < option value = "JavaScript" >JavaScript</ option > < option value = "PHP" >PHP</ option > < option value = "Shell" >Shell</ option > </ optgroup > <!-- optgroup tag ends --> </ select > </ body > </ html > |
输出:
支持的浏览器:
- 谷歌浏览器
- Internet Explorer
- 火狐
- 歌剧
- 游猎
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