创建一个服务器端控件，它映射到 <input type=hidden>
HTML 元素并允许您在窗体上不可查看的控件中存储信息。
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<input
Type="Hidden"
EnableViewState="False|True"
Id="string"
Visible="False|True"
OnDataBinding="OnDataBinding event handler"
OnDisposed="OnDisposed event handler"
OnInit="OnInit event handler"
OnLoad="OnLoad event handler"
OnPreRender="OnPreRender event handler"
OnServerChange="OnServerChange event handler"
OnUnload="OnUnload event handler"
runat="server"
/> |
备注
示例
下面的示例演示如何使用 HtmlInputHidden 控件跨请求保存视图状态信息。<span> 控件显示存储在与当前请求紧邻的前一个 Web 请求的隐藏字段中的文本。
有两个事件处理程序。第一个事件在页被回送到服务器时发生。事件处理程序获取存储在前一个发送请求的隐藏字段中的文本，并将它显示在 <span> 控件中。单击 submit 按钮时发生第二个事件。该事件处理程序获取文本框的内容，并将它存储在网页上的隐藏字段中。
| Visual Basic? |  复制代码 |
|---|
<%@ Page Language="VB" AutoEventWireup="True" %>
<html>
<head>
<title>HtmlInputHidden Control</title>
<script runat="server">
Sub Page_Load(Source As Object, e As EventArgs)
If Page.IsPostBack Then
Span1.InnerHtml = "Hidden value: <b>" + HiddenValue.Value + "</b>"
End If
End Sub
Sub SubmitBtn_Click(Source As Object, e As EventArgs)
HiddenValue.Value = StringContents.Value
End Sub
</script>
</head>
<body>
<h3>HtmlInputHidden Sample</h3>
<form id="Form1" runat="server">
<input id="HiddenValue"
type=hidden value="Initial Value" runat="server">
Enter a string:
<input id="StringContents" type=text size=40 runat="server">
<p>
<input id="Submit1" type=submit value="Enter"
OnServerClick="SubmitBtn_Click" runat="server">
<p>
<span id=Span1 runat="server">
This label will display the previously entered text.
</span>
</form>
</body>
</html>
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| C#? | 复制代码 |
|---|
<%@ Page Language="C#" AutoEventWireup="True" %>
<html>
<head>
<title>HtmlInputHidden Control</title>
<script runat="server">
void Page_Load(object Source, EventArgs e)
{
if (Page.IsPostBack)
{
Span1.InnerHtml="Hidden value: <b>" +
HiddenValue.Value + "</b>";
}
}
void SubmitBtn_Click(object Source, EventArgs e)
{
HiddenValue.Value=StringContents.Value;
}
</script>
</head>
<body>
<h3>HtmlInputHidden Sample</h3>
<form id="Form1" runat="server">
<input id="HiddenValue"
type=hidden value="Initial Value" runat="server">
Enter a string:
<input id="StringContents" type=text size=40 runat="server">
<p>
<input id="Submit1" type=submit value="Enter"
OnServerClick="SubmitBtn_Click" runat="server">
<p>
<span id=Span1 runat="server">
This label will display the previously entered text.
</span>
</form>
</body>
</html>
|
请参见
注意