从动态创建的文本框中获取文本值

本文关键字：获取 取文本 文本 动态 创建 | 更新日期: 2023-09-27 18:10:48

给定多个动态创建的文本框，我想让文本由用户填充。我使用面板和创作作品。没有找到文本框的控件。

ASPX 

<div>
  <asp:Panel ID="Panel1" runat="server"></asp:Panel>
</div>
<div>
  <asp:Button ID="Button1" runat="server" Text="Adauga autor" OnClick="Button1_Click" />
</div>

创建文本框

protected void Button1_Click(object sender, EventArgs e)
{
    int rowCount = Convert.ToInt32(Session["clicks"]);
    rowCount++;
    Session["clicks"] = rowCount;
    for (int i = 1; i <= rowCount; i++)
    {
        TextBox TxtBoxA = new TextBox();
        Label lblA = new Label();
        TxtBoxA.ID = "TextBoxA" + i.ToString();
        lblA.ID = "LabelA" + i.ToString();
        lblA.Text = "Label" + i.ToString() + ": ";
        Panel1.Controls.Add(lblA);
        Panel1.Controls.Add(TxtBoxA);
        Panel1.Controls.Add(new LiteralControl("<br />"));
    }
}

得到文本

int rowCount = Convert.ToInt32(Session["clicks"]);
for (int i = 1; i <= rowCount; i++)
{
    string item = "TextBoxA" + i.ToString();
    Control foundControl = FindControl(item, Page.Controls);
    TextBox TB = (TextBox)foundControl;
    string txt = TB.Text;
}
+ 

public static Control FindControl(string controlId, ControlCollection controls)
{
    foreach (Control control in controls)
    {
        if (control.ID == controlId)
            return control;
        if (control.HasControls())
        {
            Control nestedControl = FindControl(controlId, control.Controls);
            if (nestedControl != null)
                return nestedControl;
        }
    }
    return null;
}

文本框控件为空。我做错了什么?

从动态创建的文本框中获取文本值

您必须最迟在Page_Load中重新创建所有控件。Button1_Click太迟了。因此，在Page_Init/Page_Load中重新创建Session["clicks"]，并在Button-Click -处理程序中创建单个新控件。

一些代码:

protected void Page_Init(Object sender, EventArgs e)
{
    RecreateControls();
}
 private void RecreateControls()
 {
     int rowCount = Convert.ToInt32(Session["clicks"]);
     CreateControls(rowCount);
 }
 private void AddControl()
 {
     int rowCount = Convert.ToInt32(Session["clicks"]);
     CreateControls(1);
     Session["clicks"] = rowCount++;
 }
 private void CreateControls(int count)
 {
     for (int i = 1; i <= count; i++)
     {
         TextBox TxtBoxA = new TextBox();
         Label lblA = new Label();
         TxtBoxA.ID = "TextBoxA" + i.ToString();
         lblA.ID = "LabelA" + i.ToString();
         lblA.Text = "Label" + i.ToString() + ": ";
         Panel1.Controls.Add(lblA);
         Panel1.Controls.Add(TxtBoxA);
         Panel1.Controls.Add(new LiteralControl("<br />"));
     }
 }
 protected void Button1_Click(object sender, EventArgs e)
 {
     AddControl();
 }
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