Question

正如我所拥有的标题所示，我可以在其中插入我想要添加到占位符的文本框的数量。我可以添加文本框就好了问题是我无法在动态添加的文本框中插入值。这是我的代码

这段代码的目的是每当文本框中我可以介绍我想要的文本框数量。它创建并将它们添加到我页面中的占位符。

public void txtExtra_TextChanged(object sender, EventArgs e)
{  
    for (a = 1; a <= int.Parse(txtExtra.Text); a++)
    {
         TextBox txt = new TextBox();
         txt.ID = "txtquestion" + a;
         pholder.Controls.Add(txt);
    }
}

这是将提交和响应的按钮的代码。写入插入所有这些文本框中的值。

protected void btnConfirm_Click(object sender, EventArgs e)
{
     foreach (Control ctr in pholder.Controls)
     {
         if (ctr is TextBox)
         {        
              string value = ((TextBox)ctr).Text;
              Response.Write(value);  
         } 
     }
 }

我一直在网上搜索，而且我已经得到了这个代码很好的答案，它应该有效，但它没有。如果你们看到任何错误或有任何可以解决我的问题的建议，我真的很感激

Answer 1

你快到了。

问题

您需要在回发时重新加载动态创建的文本框。否则，它们将变为空，并且您无法找到它。

为此，您需要将动态TextBoxes ID保存在持久位置，例如View State或Session State。

屏幕截图

enter image description here

ASPX

Number of TextBoxes: <asp:TextBox runat="server" ID="CounterTextBox" 
    OnTextChanged="CounterTextBox_TextChanged" AutoPostBack="True" /><br/>
<asp:PlaceHolder runat="server" ID="TextBoxPlaceHolder" /><br/>
<asp:Button runat="server" ID="ConfirmButton" Text="Confirm" 
    OnClick="ConfirmButton_Click" /><br/>
Result: <asp:Literal runat="server" ID="ResultLiteral"/>

代码背后

private List<string> TextBoxIdCollection
{
    get
    {
        var collection = ViewState["TextBoxIdCollection"] as List<string>;
        return collection ?? new List<string>();
    }
    set { ViewState["TextBoxIdCollection"] = value; }
}

protected void Page_Load(object sender, EventArgs e)
{
    foreach (string textboxId in TextBoxIdCollection)
    {
        var textbox = new TextBox {ID = textboxId};
        TextBoxPlaceHolder.Controls.Add(textbox);
    }
}

protected void CounterTextBox_TextChanged(object sender, EventArgs e)
{
    var collection = new List<string>();
    int total;
    if (Int32.TryParse(CounterTextBox.Text, out total))
    {
        for (int i = 1; i <= total; i++)
        {
            var textbox = new TextBox { ID = "QuestionTextBox" + i };
            // Collect this textbox id
            collection.Add(textbox.ID); 
            TextBoxPlaceHolder.Controls.Add(textbox);
        }
        TextBoxIdCollection= collection;
    }
}

protected void ConfirmButton_Click(object sender, EventArgs e)
{
    foreach (Control ctr in TextBoxPlaceHolder.Controls)
    {
        if (ctr is TextBox)
        {
            string value = ((TextBox)ctr).Text;
            ResultLiteral.Text += value;
        }
    }
}

Answer 2

您实际创建的文本框的属性Text设置为default =“”;因此，您需要设置txt.Text属性，例如：

    public void txtExtra_TextChanged(object sender, EventArgs e)
    {
        for (int a = 1; a <= int.Parse(txtExtra.Text); a++)
        {
            TextBox txt = new TextBox();
            txt.ID = "txtquestion" + a;
            txt.Text = "Some text"; // Set some text here
            pholder.Controls.Add(txt);

        }
    }

修改

之后，您可以将值存储到列表中：

private static List<string> values = new List<string>(); protected void btnConfirm_Click(object sender, EventArgs e) { foreach (Control ctr in pholder.Controls) { if (ctr is TextBox) { string value = ((TextBox)ctr).Text; values.Add(value); // add values here } } }

修改这是你的价值观：

修改对于超级大型更好的理解：再创建一个文本框txtOutput，然后添加按钮GetDataFromTextBoxesAndPutItBelow并为该按钮创建一个事件“Click”。活动代码：

protected void btnGetData_Click(object sender, EventArgs e) { for (int i = 0; i < values.Count; i++) txtOutput.Text += "Value from txtquestion1: " + values[i] + " "; }

屏幕截图看起来：

Answer 3

for (int i = 0; i < dataTable.Rows.Count; i++)
{

    int comment_id = Convert.ToInt32(dataTable.Rows[i]["comment_id"]);
    string created_by_name = dataTable.Rows[i]["created_by_name"].ToString();
    string created_at = dataTable.Rows[i]["created_at"].ToString();
    string comment = dataTable.Rows[i]["comment"].ToString();

    HtmlGenericControl divComment = new HtmlGenericControl("div"); //This is root object of comment.Other objects like textbox,button,etc added into this object.
    //divComment.Attributes.Add("class", "div_post_display");
    divComment.Attributes.Add("id", comment_id.ToString());

    /* Comment by */
    HtmlGenericControl lblCommentBy = new HtmlGenericControl("label");
    //lblCommentBy.Attributes.Add("class", "divauthor");
    lblCommentBy.InnerText = "" + created_by_name + " (" + created_at + ")";

    /* Comment body */
    HtmlGenericControl pComment = new HtmlGenericControl("p");
    //lblCommentBy.Attributes.Add("class", "divauthor");
    pComment.InnerText = comment;

    divComment.Controls.Add(lblCommentBy);
    divComment.Controls.Add(pComment);

    if (Session["user_id"] != null)
    {
        if (Session["user_level"].ToString() == "1") //Admin can reply for comment
        {
            /* Reply Form */
            TextBox txtReply = new TextBox(); //Create object dynamacaly
            txtReply.ID = "txtReply_"+comment_id;
            txtReply.Attributes.Add("class", "form-control"); //Add css class
            txtReply.Width = 400;
            divComment.Controls.Add(txtReply); //Add obj to root object(div)

            Button btnReply = new Button(); //Create object dynamacaly
            btnReply.Text = "Reply"; //Set button text 
            btnReply.Attributes.Add("class", "btn btn-sm btn-success"); //Add css class
            btnReply.Click += btnReply_Click;
            btnReply.CommandArgument = comment_id.ToString();
            divComment.Controls.Add(btnReply); //Add obj to root object(div)

            HtmlGenericControl br = new HtmlGenericControl("br"); //Create object dynamacaly
            divComment.Controls.Add(br); //new line
        }
    }
    pnlShowComments.Controls.Add(divComment);

}

从动态添加的文本框中获取值asp.net c＃

3 个答案:

问题

屏幕截图

ASPX

代码背后