asp.net – TextBox在使用TextMode Number回发后丢失了值

发布时间：2020-12-16 06:27:58 所属栏目：asp.Net 来源：网络整理

导读：有奇怪的问题.我有TextBox的简单页面： asp:ScriptManager runat="server" /asp:UpdatePanel runat="server" ContentTemplate asp:TextBox ID="amountTextBox" runat="server" TextMode="Number" / asp:Button runat="server" Text="Confirm" OnClick="confi

有奇怪的问题.我有TextBox的简单页面：

<asp:ScriptManager runat="server" />
<asp:UpdatePanel runat="server">
    <ContentTemplate>
        <asp:TextBox ID="amountTextBox" runat="server" TextMode="Number" />
        <asp:Button runat="server" Text="Confirm" OnClick="confirmButton_Click" />
    </ContentTemplate>
</asp:UpdatePanel>

单击按钮后我尝试获取TextBox值：

public partial class test : Page {
    protected void confirmButton_Click(object sender,EventArgs e) {
        var answer = amountTextBox.Text;
    }
}

但它是空的.如果我删除UpdatePanel,我设法获得值.如果我离开UpdatePanel并删除TextMode属性,我设法获取值.但为什么我不能将TextBo TextMode设置为UpdatePanel中的Number？

解决方法

它是 a known issue,.NET 4.5 RTM中提供了一个修复程序.

描述

HTML5 has new types for the input tag,such as type=”number”,which is
needed to make mobile phones display a numerical keyboard instead of a
text keyboard. When doing a full postback of the page it works in all
browsers. But if I puts these in an updatepanel on a website to do a
partical postback,then none of the new HTML input types are included
in the postback response to the server from those browsers that
understands these new types (Safari/WebKit and Opera). It works
correctly in IE8 and Firefox 4,but probably only because they have
not implemented these new types and falls back to understanding it as
a type=”text” field.

以下是此问题和解决方法的另一个问题：UpdatePanel with input type other than text in html5.

（编辑：李大同）

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