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[英]How Can I get the value in the gridview footer row of textbox and dropdownlist in asp.net c# webform
[英]How to get all textbox from a placeholder? asp.net c# webform
我的html上有一個asp:placeholder,我正在訪問它以添加文本框和標簽來回答問題。
正確創建了“表單”,我得到了帶有問題的所有標簽以及每個答案的文本框,但是當我單擊按鈕后,單擊runatserver時,Placeholder1始終為空。
我嘗試了很多事情來獲取文本框值,以便在沒有運氣的情況下插入數據庫。
在我的代碼下面。
提前謝謝你的幫助。
Web表單中表單的HTML代碼:
/* form for the buttons and title*/
<form id="form2" runat="server">
<div align="center">
</div>
<div>
<div align="center" class="form-group">
<h4>
<asp:label runat="server" id="title"></asp:label>
</h4>
<br />
<br />
<div align="center">
place holder for the questions&answers
<asp:placeholder id="Placeholder1" runat="server">
</asp:placeholder>
</div>
</div>
</div>
<br />
<br />
C#代碼獲取多少個問題,然后為每個答案添加一個文本框,使用帶有計數器的cicle來添加id + counter
/* c# a counter is made to increment a number to the id*/
Adding controls to the PlaceHolder1
/* add controls: */
為sqlresult的所有行數在計數器內添加標簽* /
標簽
Label quest= new Label();
quest.ID = "quest" + counter;
quest.Attributes.Remove("class");
quest.Attributes.Add("class", "exampleFormControlInput1");
quest.text = "sql query";
文本框/ 在提示框上添加文本框 /
TextBox answer = new TextBox();
answer .ID = "answer " + counter;
answer .Attributes.Remove("class");
answer .Attributes.Add("class", "form-control");
PlaceHolder1.Controls.Add(quest);
PlaceHolder1.Controls.Add(new LiteralControl("<br>"));
PlaceHolder1.Controls.Add(answer);
PlaceHolder1.Controls.Add(new LiteralControl("<br>"));
檢查PlaceHolder1內部有多少個控件
嘗試檢查PlaceHolder1中有多少個控件
count = PlaceHolder1.Controls.Count;
總是0
您可能沒有在PostBack上重新創建控件。 請參閱此工作示例。
protected void Page_Load(object sender, EventArgs e)
{
if (IsPostBack == false)
{
//do not create controls here
}
for (int count = 0; count < 5; count++)
{
TextBox answer = new TextBox();
answer.ID = "answer " + count;
PlaceHolder1.Controls.Add(answer);
}
}
然后在回發
protected void Button1_Click(object sender, EventArgs e)
{
int count = PlaceHolder1.Controls.Count;
for (int i = 0; i < count; i++)
{
TextBox answer = PlaceHolder1.FindControl("answer " + i) as TextBox;
Label1.Text += answer.Text + "<br>";
}
}
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