使用Javascript隐藏选择框中的选项
[英]Hiding options in select box using Javascript
问题描述
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var id = document.getElementById('nav-container');
var sel = id.getElementsByTagName('select');
var option = sel.getElementsByTagName('option');
sel.remove(3);
Hi, I have the above Javascript to hide the 3rd option in the select box shown below: 
嗨，我有上面的Javascript隐藏了下面显示的选择框中的第3个选项：
However, the last line, sel.remove(3); 但是，最后一行sel.remove(3); does not seem to work. 似乎不起作用。 I get an error of Uncaught TypeError: undefined is not a function?page_id=1361:188 (anonymous function) 我收到Uncaught TypeError: undefined is not a function?page_id=1361:188 (anonymous function)的错误Uncaught TypeError: undefined is not a function?page_id=1361:188 (anonymous function)
Did I use the wrong function? 我使用了错误的功能吗？ Any suggestions on how to modify my codes? 关于如何修改我的代码有什么建议吗？ Thanks. 谢谢。
3 个解决方案
解决方案1
1 2015-01-21 02:59:22
id.getElementsByTagName('select') is returning a list of elements, of which there is only one. id.getElementsByTagName('select')返回一个元素列表，其中只有一个。 If there is only one select element, you should be able to change this: 如果只有一个选择元素，则应该可以更改此元素：
var option = sel.getElementsByTagName('option');
sel.remove(3);
to this: 对此：
var option = sel[0].getElementsByTagName('option'); //was causing error
sel[0].remove(2); //assuming you want to remove 3rd element, not index 3
解决方案2
0 2015-01-21 02:51:40
document.getElementById("sel").remove(1); var selAry = document.getElementsByTagName("select"); selAry[0].remove(0);
<select id="sel"> <option value="1">1</option> <option value="2">2</option> <option value="3">3</option> </select>
document.getElementById("sel") returns a collection of matched elements, so if you want to access one of them, use array index like selAry[0] . document.getElementById("sel")返回匹配元素的集合，因此，如果要访问其中一个，请使用selAry[0]类的数组索引。
解决方案3
0 已采纳 2015-01-22 04:04:47
Apparently there's another script that was interfering with the script I have written, therefore I added a few lines before my script to make it load after my page is fully loaded: 显然还有另一个脚本正在干扰我编写的脚本，因此我在脚本之前添加了几行以使其在页面完全加载后加载：
$( document ).ready(function() {
$("#nav-container > select > option:eq(2)").remove();
$("#nav-container > select > option:eq(7)").remove();
$("#nav-container > select > option:eq(10)").remove();
});
And thus, this solved my problem. 因此，这解决了我的问题。 Thanks to everyone who helped! 感谢所有提供帮助的人！
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使用JavaScript的两个选择框动态选项 - Two select box dynamic options using javascript
Need Optimized解决方案，用于隐藏选择框选项 - Need Optimized solution, for hiding the select box options
隐藏已在 select 框中选择的选项 ReactJS - Hiding options already selected in a select box ReactJS
隐藏/显示在jQuery中的选择框选项？ - Hiding/showing the select box options in jquery?
我的JavaScript错误，无法隐藏选择选项 - Error in my javascript for hiding select options
使用javascript对选择框中的选项重新排序 - Reorder the options in a select box with javascript
javascript不显示/隐藏复选框上的选择框，单击 - javascript not showing/hiding select box on checkbox click
使用Javascript从“多个选择”框中隐藏选项 - Hide Options from Mutiple Select box using Javascript
在选择中隐藏特定选项 - Hiding specific options in select
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