Javascript 回传后在js中分配的隐藏值丢失
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Hidden value assigned in js lost after postback
提问by Gonzalo
Here's my problem. I have a hidden field whose value I change through a javascript method. The problem is after postback the value is lost.
这是我的问题。我有一个隐藏字段，我通过 javascript 方法更改了它的值。问题是回发后值丢失了。
How can I persist the value after postback?
回发后如何保留该值？
Thanks!
谢谢！
.aspx File
.aspx 文件
<asp:HiddenField ID="HiddenField1" runat="server" />
<asp:Button ID="BtnGuardar" runat="server" OnClick="BtnGuardar_Click" OnClientClick="return GridUpdateInfoOK()" />
.js file
.js 文件
document.getElementById('<%= HiddenField1.ClientID %>').value = 'TEST';
.aspx.cs file
.aspx.cs 文件
protected void BtnGuardar_Click(object sender, EventArgs e)
{
String test = HiddenField1.Value;
}
回答by marto
You don't need to have the hidden input run at server. You can do:
您不需要在服务器上运行隐藏的输入。你可以做：
<input type="hidden" id="HiddenInput" name="HiddenInput" value="" />
Then when you post back you can access it like that:
然后当你回发时，你可以像这样访问它：
protected void BtnGuardar_Click(object sender, EventArgs e)
{
String test = Request.Form["HiddenInput"];
}
回答by noinstance
That doesn't work like that. The value is not present since the PageLoad, so won't be postbacked. Try using a TextBox with style="display:none".
那不是那样工作的。自 PageLoad 以来该值不存在，因此不会回发。尝试使用 style="display:none" 的 TextBox。
回答by Shiblee
Please use
请用
<asp:HiddenField ID="HiddenField1" runat="server" EnableViewState="true"/>
Then we will get the value after postback.
然后我们将在回发后获得该值。
All the properties of HiddenField are as bellow:
HiddenField 的所有属性如下：
<asp:HiddenField
EnableTheming="True|False"
EnableViewState="True|False"
ID="string"
OnDataBinding="DataBinding event handler"
OnDisposed="Disposed event handler"
OnInit="Init event handler"
OnLoad="Load event handler"
OnPreRender="PreRender event handler"
OnUnload="Unload event handler"
OnValueChanged="ValueChanged event handler"
runat="server"
SkinID="string"
Value="string"
Visible="True|False"
/>
