Select size attribute

Definition and Usage

size Attribute to set or return the size of the dropdown list Size attribute Value.

The size attribute specifies the number of visible options in the dropdown list.

Note:In Chrome and Safari, the size attribute may not work properly for size="2" and size="3".

See also:

HTML Reference Manual:HTML <select> size 属性

HTML Reference Manual:HTML <select> 标签

Example

Example 1

Change the number of visible options in the dropdown list:

document.getElementById("mySelect").size = "4";

Try it yourself

Example 2

Return the number of visible options in the dropdown list:

var x = document.getElementById("mySelect").size;

Try it yourself

Syntax

Return size attribute:

selectObject.size

Set size attribute:

selectObject.size = number

属性值

描述
number

规定下拉列表中可见选项的数量。

如果该值大于 1,但小于列表中的选项总数,浏览器会添加滚动条,表示还有更多选项可以查看。

技术细节

返回值: 数值,表示下拉列表中可见选项的数量。

浏览器支持

Chrome Edge Firefox Safari Opera
Chrome Edge Firefox Safari Opera
支持 支持 支持 支持 支持