how to get textbox value in placeholder on code behind?(如何在后面的代码的占位符中获取文本框值?)

本文介绍了如何在后面的代码的占位符中获取文本框值?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我创建了一些文本框，我想动态获取它们的值.简要地，我解释一下我的页面:

I created some textbox and I want to get their value dynamically. Briefly, ı explain my page:

我有下拉列表的编号为 1 到 15.当用户选择编号时，我将文本框创建为选定编号.例如;用户选择 3，我创建 3 个文本框，用户在文本框中写一些东西.这是我的代码:aspx端:

I have dropDown list has number 1 to 15.When the user select number and I created textbox as selected number. for example; user select 3 and I create 3 text box and user write something in textbox. Here is My Code: aspx Side:

  <asp:DropDownList ID="ddlUserSelected" AutoPostBack="true" OnSelectedIndexChanged="ddlUserSelected_SelectedIndexChanged" runat="server">
 <asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
 <asp:Button ID="btnSave" runat="server" Text="Save" OnClick="btnSave_Click"/>

背后的代码:

    protected void ddlUserSelected_SelectedIndexChanged(object sender, EventArgs e)
    {
     for (int a = 1; a <= int.Parse(ddlUserSelected.SelectedItem.Text); a++)
            {

                TextBox txtDate = new TextBox();
                Label lbl = new Label();          
                lbl.Text = "<br/>";        
                txtDate .Width = 70;
                txtDate .CssClass = "tbl";
                txtDate .ID = "txtDate" + a;                  
                PlaceHolder1.Controls.Add(txtDate);            
                PlaceHolder1.Controls.Add(lbl);

            }
}

我还有保存按钮.

protected void btnSave_Click(object sender, EventArgs e)
{

   for (int a = 1; a <= int.Parse(ddlUserSelected.SelectedItem.Text); a++)
    {              
      //I want to get each textbox value               
    }

}

注意:for循环无关紧要(可以删除)我的主要目的是获取文本框值.

Note: for loop doesn't matter (can be removed) My main aim is get the text box value.

如何在btnSave_Click 方法中获取文本框的值?

How to get textbox(es) value in btnSave_Click method?

推荐答案

下面的代码会帮助你

 protected void ddlUserSelected_SelectedIndexChanged(object sender, EventArgs e)
  {
    for (int a = 1; a <= int.Parse(ddlUserSelected.SelectedItem.Text); a++)
    {

        TextBox txtDate = new TextBox();
        Label lbl = new Label();
        lbl.Text = "<br/>";
        txtDate.Width = 70;
        txtDate.CssClass = "tbl";
        txtDate.ID = "txtDate" + a;
        PlaceHolder1.Controls.Add(txtDate);
        PlaceHolder1.Controls.Add(lbl);

    }
  }
  protected void btnSave_Click(object sender, EventArgs e)
  {

    for (int a = 1; a <= int.Parse(ddlUserSelected.SelectedItem.Text); a++)
    {
        if(Request.Form.Get("txtDate" + a.ToString()) != null)
        {
            var str = Request.Form.Get("txtDate" + a.ToString());
        }        
    }
  }

如果您使用母版页，请使用以下代码

If you are used master page then use below code

        if (Request.Form.Get("ctl00$ContentPlaceHolder1$txtDate" + a.ToString()) != null)
        {
            var str = Request.Form.Get("ctl00$ContentPlaceHolder1$txtDate" + a.ToString());
        }

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