使用Javascript隐藏和显示下拉菜单和文本字段_Javascript_Html

使用Javascript隐藏和显示下拉菜单和文本字段

javascript html

使用Javascript隐藏和显示下拉菜单和文本字段,javascript,html,Javascript,Html,在下面的下拉菜单中，当用户选择操作否时，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>

在下面的下拉菜单中，当用户选择操作否时，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>

它只是禁用了它。我希望它是隐形的。谢谢你看：

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

将style=“display:none”添加到操作nos选择：

您无需通过

此检查（）
如果选择“OpNo”，则修改函数以切换此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";
    }
}

示例：
使用以下命令：-
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>


手术编号
员工编号
1001
1002

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';
}

<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>