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This article mainly explains "html how to set the drop-down box option is not optional", the article explains the content is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in-depth, together to study and learn "html how to set the drop-down box option is not optional" bar!

In html, you can set the disabled attribute to the option tag element, disable the specified option, make the specified option unselectable, and syntax "option value".

The operating environment of this tutorial: windows7 system, HTML5 version, Dell G3 computer.

In html, you can make option unselectable by setting the option attribute on the option tag element.

The disabled attribute specifies that an option should be disabled. Disabled options are neither available nor clickable.

Syntax:

Example:

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Application: you can set the disabled property until certain conditions are met (such as selecting a check box) to restore user use of this option. You can then use JavaScript to clear the disabled property to make the option available.

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