第一个动态文本框应出现在页面加载上 [英] First dynamic text box should appear on page load

问题描述

我创建了一个占位符，按钮。单击按钮动态文本框正在生成。我想显示第一个动态文本框应该始终显示。然后当我点击按钮时，下一个文本框应该出现。



这里是我的代码

Hi,
I have created a placeholder, button. on clicking the button dynamic textbox is generating. i want to show the first dynamic textbox should appear always. then when i click the button the next textbox should appear.

here is my code

<pre>  protected void LinkButton1_Click(object sender, EventArgs e)
    {
        CreateDynamicControls(true);
    }
  private void CreateDynamicControls(bool incrementRowCount = false)
    {
        int rowCount = 0;

        //initialize a session.
        rowCount = Convert.ToInt32(ViewState["clicks"]);

        if (incrementRowCount)
            rowCount++;

        ViewState["clicks"] = rowCount;

        //Create the textboxes and labels each time the button is clicked.
        for (int i = 0; i < rowCount; i++)
        {
            TextBox TxtBoxU = new TextBox();
            //TextBox TxtBoxE = new TextBox();

            Label lblU = new Label();
            //Label lblE = new Label();

            TxtBoxU.ID = "TextBoxU" + i.ToString();
            //TxtBoxE.ID = "TextBoxE" + i.ToString();
            TxtBoxU.Width=900;
            

            lblU.ID = "LabelU" + i.ToString();
            //lblE.ID = "LabelE" + i.ToString();

            lblU.Text = (i + 1).ToString() + " : ";
            //lblE.Text = "E-Mail : ";

            //Add the labels and textboxes to the Panel.
            PlaceHolder1.Controls.Add(lblU);
            PlaceHolder1.Controls.Add(TxtBoxU);
            PlaceHolder1.Controls.Add(new LiteralControl("<br/>"));
            PlaceHolder1.Controls.Add(new LiteralControl("<br/>"));
        }
    }
Kindly help

我尝试了什么：

What I have tried:

</<pre><pre>  protected void LinkButton1_Click(object sender, EventArgs e)
    {
        CreateDynamicControls(true);
    }
  private void CreateDynamicControls(bool incrementRowCount = false)
    {
        int rowCount = 0;

        //initialize a session.
        rowCount = Convert.ToInt32(ViewState["clicks"]);

        if (incrementRowCount)
            rowCount++;

        ViewState["clicks"] = rowCount;

        //Create the textboxes and labels each time the button is clicked.
        for (int i = 0; i < rowCount; i++)
        {
            TextBox TxtBoxU = new TextBox();
            //TextBox TxtBoxE = new TextBox();

            Label lblU = new Label();
            //Label lblE = new Label();

            TxtBoxU.ID = "TextBoxU" + i.ToString();
            //TxtBoxE.ID = "TextBoxE" + i.ToString();
            TxtBoxU.Width=900;
            

            lblU.ID = "LabelU" + i.ToString();
            //lblE.ID = "LabelE" + i.ToString();

            lblU.Text = (i + 1).ToString() + " : ";
            //lblE.Text = "E-Mail : ";

            //Add the labels and textboxes to the Panel.
            PlaceHolder1.Controls.Add(lblU);
            PlaceHolder1.Controls.Add(TxtBoxU);
            PlaceHolder1.Controls.Add(new LiteralControl("<br/>"));
            PlaceHolder1.Controls.Add(new LiteralControl("<br/>"));
        }}

>

推荐答案

您需要将代码放在PageLoad事件中创建第一个TextBox。 />


另外我认为你的 CreateDynamicControls 一次只能创建一组textbox + label - 你要去尝试重新创建预先存在的控件，如代码当前所示

You need to put the code to create the first TextBox in the PageLoad event.

Also I think your CreateDynamicControls should only be creating one set of textbox + label at a time - you're going to try to recreate pre-existing controls as the code currently stands

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