[英]Read textBox from dynamically created
我正在嘗試使用字符串動態創建文本框。 然后嘗試點擊一下按鈕。
<%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="textboxtest.aspx.cs" Inherits="test2.textboxtest" %>
<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<div id="TextBoxDiv" runat="server" class="asid box">
</div>
<asp:Button ID="Button1" runat="server" Text="CreateTextBox" onclick="Button1_Click" />
<asp:Button ID="Button2" runat="server" Text="ReadTextBox" onclick="Button2_Click" />
</asp:Content>
這是背后的代碼。
protected void Button1_Click(object sender, EventArgs e)
{
string finalText = @"<input type=""text"" ID=""T1"" runat=""server"">
<asp:TextBox ID=""TB1"" runat=""server""></asp:TextBox>";
TextBoxDiv.InnerHtml = finalText;
}
protected void Button2_Click(object sender, EventArgs e)
{
TextBox txtAddress2 = (TextBox)Page.FindControl("TB1");
foreach (Control c in TextBoxDiv.Controls)
{
if (c is TextBox)
{
TextBox txt = (TextBox)c;
string str = txt.Text;
}
}
}
正如您從代碼中看到的那樣,我嘗試使用查找控件並循環訪問文本框。 但兩者都失敗了。
我設法使其正常運行,但是只需要在Page_Init event
創建動態文本框即可。 因此,每當有回發時,您都需要重新創建動態控件。 您可以在線檢查,他們說的都是一樣的話。
所以這是客戶端:
<asp:PlaceHolder runat="server" id="TextBoxesHere" />
<asp:Button ID="Button1" CssClass="btn btn-primary btn-outline" runat="server"
Text="CreateTextBox" OnClick="Button1_Click" />
<asp:Button ID="Button2" CssClass="btn btn-primary btn-outline" runat="server"
Text="ReadTextBox" OnClick="Button2_Click" />
服務器端:
protected void Page_Init(object sender, EventArgs e)
{
TextBox txt = new TextBox();
txt.ID = "T1";
txt.CssClass = "form-control";
TextBoxesHere.Controls.Add(txt);
}
protected void Button1_Click(object sender, EventArgs e)
{
TextBox txt = new TextBox();
txt.ID = "T1";
txt.CssClass = "form-control";
TextBoxesHere.Controls.Add(txt);
}
protected void Button2_Click(object sender, EventArgs e)
{
TextBox txt = (TextBox)TextBoxesHere.FindControl("T1");
ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "", "alert('" + txt.Text + "');", true);
}
使用一個Placeholder
代替div(它將生成一個div),然后在占位符中添加控件而不是使用InnerHtml
。
因此可以這樣實現:
<%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="textboxtest.aspx.cs" Inherits="test2.textboxtest" %>
<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="server"></asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<asp:PlaceHolder runat="server" ID="TextBoxPlaceHolder"></asp:PlaceHolder>
<asp:Button ID="Button1" runat="server" Text="CreateTextBox" onclick="Button1_Click" />
<asp:Button ID="Button2" runat="server" Text="ReadTextBox" onclick="Button2_Click" />
</asp:Content>
后台代碼:
protected void Button1_Click(object sender, EventArgs e)
{
string finalText = @"<input type=""text"" ID=""T1"" runat=""server"">";
var textbox = new TextBox();
textbox.ID = "TB1";
this.TextBoxPlaceHolder.Controls.Add(new LiteralControl(finalText));
this.TextBoxPlaceHolder.Controls.Add(textbox);
}
protected void Button2_Click(object sender, EventArgs e)
{
TextBox txtAddress2 = (TextBox)Page.FindControl("TB1");
foreach (Control c in TextBoxDiv.Controls)
{
if (c is TextBox)
{
TextBox txt = (TextBox)c;
string str = txt.Text;
}
}
}
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