Javascript - 多个SELECT框，删除'SELECTED'选项 [英] Javascript - Multiple SELECT boxes, remove 'SELECTED' options

问题描述

我们希望按顺序排列人员，但不希望允许多次选择相同的选项：

 人员编号1 
< select name =person1> 
< option value =null>请选择一个选项< / option> 
< option value =1> 1< / option> 
< option value =2> 2< / option> 
< option value =3> 3< / option> 
< / select> 
 
人员编号2 
< select name =person2> 
< option value =null>请选择一个选项< / option> 
< option value =1> 1< / option> 
< option value =2> 2< / option> 
< option value =3> 3< / option> 
< / select> 
 
人员编号3 
< select name =person3> 
< option value =null>请选择一个选项< / option> 
< option value =1> 1< / option> 
< option value =2> 2< / option> 
< option value =3> 3< / option> 
< / select> 
  

所以在这里，如果有人在第一人称框中选择了选项1，所有选项框都将被重新填充删除（或禁用）该选项。

显然，第一个选项 - null请选择选项必须被忽略。

我还需要某种'重置'功能？

不知道从哪里开始，有什么想法？

谢谢！

解决方案

如果我理解正确，您有N个人想要排名1到N（没有人排除在排名之外）。

如果JavaScript组件对于您的上下文是可接受的选项，那么我建议您使用可分类组件：

http://jqueryui.com/sortable/

与具有多个select元素相比，它可以提供更好的用户体验。

修改：好的，我从评论中看到你真的想用Nselect。按照Flea777的建议，您应该查看JQuery的.change（）事件，并在已经选择的选项条目上设置禁用属性：
http://www.w3schools.com/tags/att_option_disabled.asp

We're wanting to rank people in order, but don't want to allow the same option to be selected more than once:

Person Number 1
<select name="person1">
<option value="null">Please Select an option</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>

Person Number 2
<select name="person2">
<option value="null">Please Select an option</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>

Person Number 3
<select name="person3">
<option value="null">Please Select an option</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>

So here, if someone chooses option 1 in the first person box, all the option boxes would be repopulated with that option removed (or disabled).

Obviously the first option - null 'Please Select an Option' must be ignored.

I would also need some kind of 'reset' functionality?

No idea where to start with this, any ideas?

thanks!

解决方案

If I understand correctly, you have N persons that you want to rank from 1 to N (there's nobody left out of the ranking).

If JavaScript components are an acceptable option for your context, then I would suggest you use the «Sortable» component :

http://jqueryui.com/sortable/

It could give a better user experience than having multiple "select" elements.

EDIT : Ok I see from the comments that you really want to use N "select". As suggested by Flea777 you should look at the .change() event of JQuery, and set the "disabled" attribute on the "option" entries which have already been selected : http://www.w3schools.com/tags/att_option_disabled.asp

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