使用Javascript隐藏和显示下拉菜单和文本字段

Question

In the following drop-down menu, when a user selects operation No, I want the next drop-down menu displayed 在下面的下拉菜单中，当用户选择操作No时，我希望显示下一个下拉菜单

<select id="OperationType" onChange="check(this);">
 <option value="OpNo">Operation No</option>
 <option value="OpEmp">Employee No</option>
</select>

<select id=OperationNos>
 <option value="1001">1001</option>
 <option value="1002">1002</option>
</select>

If the user selects employee no, I want the last drop-down menu to be hidden and the following text field shown up: 如果用户选择员工号，我希望隐藏最后一个下拉菜单，并显示以下文本字段：

<input type='text'>

What I did is I put the following script but it doesn't hide neither of the two elements: 我做的是我把以下脚本但它不会隐藏这两个元素：

function check(elem) {
    document.getElementById('OperationType').disabled = !elem.selectedIndex;
}

It only disabled it. 它只是禁用它。 I want it to be invisible. 我希望它是隐形的。 Thanks 谢谢

Answer 1

~~Add a style="display: none" to your OperationNos select: 在您的OperationNos选择中添加style =“display：none”：~~

You do not need to pass this to check(). 你并不需要通过this检查（）。

And modify your function to toggle this css property if "OpNo" is selected: 如果选择“OpNo”，则修改您的函数以切换此css属性：

function check() {
    var dropdown = document.getElementById("OperationType");
    var current_value = dropdown.options[dropdown.selectedIndex].value;

    if (current_value == "OpNo") {
        document.getElementById("OperationNos").style.display = "block";
    }
    else {
        document.getElementById("OperationNos").style.display = "none";
    }
}

Example: http://jsfiddle.net/2pna2/ 示例： http ： //jsfiddle.net/2pna2/

Answer 2

Use this:- 用这个：-

function hideshow()
{
var s1= document.getElementById('OperationType');
var s2= document.getElementById('OperationNos');

if( s1.options[s1.selectedIndex].text=="Operation No")
{
s2.style.visibility = 'visible';
document.getElementById('t1').style.visibility = 'hidden';
}
if( s1.options[s1.selectedIndex].text=="Employee No")
{
s2.style.visibility = 'hidden';
document.getElementById('t1').style.visibility = 'visible';
}
}
function hide()

{

document.getElementById('t1').style.visibility = 'hidden';
}

Html code:- Html代码： -

<body onload="hide()">

<select id="OperationType" onChange="hideshow()">
 <option value="OpNo">Operation No</option>
 <option value="OpEmp">Employee No</option>
</select>

<select id="OperationNos">
 <option value="1001">1001</option>
 <option value="1002">1002</option>
</select>

<input type="text" id="t1" />
</body>

Answer 3

Look at that: 看那个：

var ot = document.getElementById('OperationType');
ot.disabled = !elem.selectedIndex;
ot.style.display = 'none'; // not rendered
//ot.style.visisbility = 'hidden'; // rendered but just invisble it's there

使用Javascript隐藏和显示下拉菜单和文本字段

问题描述

3 个解决方案

解决方案1
6 已采纳 2013-04-07 08:30:47

解决方案2
2 2013-04-07 08:32:59

解决方案3
1 2013-04-07 08:29:10

使用Javascript隐藏和显示下拉菜单和文本字段

问题描述

3 个解决方案

解决方案1 6 已采纳 2013-04-07 08:30:47

解决方案2 2 2013-04-07 08:32:59

解决方案3 1 2013-04-07 08:29:10

解决方案1
6 已采纳 2013-04-07 08:30:47

解决方案2
2 2013-04-07 08:32:59

解决方案3
1 2013-04-07 08:29:10