从选择列表中清除所有选项组和选项 [英] Clear all optgroups and options from a select list

问题描述

我有一个多选列表，它是根据asp页面上的先前选择动态创建的。我要做的第一件事就是通过


document.form1.itemcross.length = 0;


的治疗选项列表>
唯一的问题是它离开了optgroups。我如何获得

摆脱选择组？


谢谢

BrianD

I have a multiple select list that is created dynamically based on a
previous selection on an asp page. The first thing I do is to clear
the curent option list by

document.form1.itemcross.length = 0;

The only problem is that it leaves the optgroups. How do I also get
rid of the optgroups?

Thanks
BrianD

推荐答案

Brian D写道：

Brian D wrote:

我有一个基于
在asp页面上的先前选择。我要做的第一件事就是通过


document.form1.itemcross.length = 0;


的治疗选项列表>
唯一的问题是它离开了optgroups。我如何获得

摆脱选择组？


谢谢

BrianD

I have a multiple select list that is created dynamically based on a
previous selection on an asp page. The first thing I do is to clear
the curent option list by

document.form1.itemcross.length = 0;

The only problem is that it leaves the optgroups. How do I also get
rid of the optgroups?

Thanks
BrianD

你需要一个对象的id或对它的引用：


< script>

//通过引用删除一个对象

function del（element）{element.parentNode.removeChild（elemen t）;}

//通过id获取对象的引用：

function

You need an id for the object or a reference to it:

<script>
// delete an object by reference
function del(element){element.parentNode.removeChild(elemen t);}
// Get a reference to an object by id:
function

（id）{return document.getElementById（id）;}
//按ID删除对象：

function

(id){return document.getElementById(id);}
// Delete an object by id:
function

del（id）{x =

del(id){x=

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