javascript 无法在javascript中设置隐藏字段值
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Unable to set hidden field value in javascript
提问by Kings
I have defined a hidden filed in aspx:-
我在 aspx 中定义了一个隐藏的文件：-
<asp:HiddenField runat ="server" ID="hfBrand" value = "False" />
A combo-box control is calling a JavaScript function function:-
组合框控件正在调用 JavaScript 函数函数：-
<telerik:RadComboBox ID="Brands" runat="server"
onclientselectedindexchanged="LoadProperties"
AutoPostBack="True">
</telerik:RadComboBox>
In that function , I am trying to set that hidden field value to "True":-
在该函数中，我试图将该隐藏字段值设置为“True”：-
function LoadProperties(sender, eventArgs)
{
var lblBrand = document.getElementById('<%= hfBrand.ClientID %>').value;
alert(lblBrand);
document.getElementById('<%= hfBrand.ClientID %>').value = "True";
alert(lblBrand)
}
QUESTION:- I can't set the hidden field value to TRUE. WHY it so?? and How to do that?
问题：- 我无法将隐藏字段值设置为 TRUE。为什么会这样？？以及如何做到这一点？
UPDATE:- Here is the solution which got me right desired output:-
更新：-这是让我得到正确输出的解决方案：-
var lblBrand = document.getElementById('<%= hfBrand.ClientID %>').value;
alert(lblBrand);
lblBrand = "True";
alert (lblBrand);
Thnx to everyone who helped me.
感谢所有帮助过我的人。
回答by Steve
Your second alert is not referring to the hidden values new value. lblBrand value doesnt change after you have updated the hfBrand input value
您的第二个警报不是指隐藏值新值。更新 hfBrand 输入值后，lblBrand 值不会更改
function LoadProperties(sender, eventArgs)
{
var lblBrand = document.getElementById('<%= hfBrand.ClientID %>');
alert(lblBrand.value);
document.getElementById('<%= hfBrand.ClientID %>').value = "True";
alert(lblBrand.value)
}
Try this code!
试试这个代码！
I reckon it is setting it and you need to get the value of the input again...
我认为它正在设置它，您需要再次获取输入的值...
(if you wanna see the change, just temporarily change your hidden input to a normal textbox
（如果您想看到更改，只需暂时将隐藏的输入更改为普通文本框
