带有生成的HTML代码的Web应用程序包含不显示消息的复选框。 （Asp.net，C＃）

Question

我发现奇怪的是，当我选中某些复选框（生成的HTML代码）时，子功能没有警告（或显示消息）正在选中哪个复选框。

我想念什么吗？

在WebForm.aspx内部

 <script type="text/javascript">

 function sub()
 {

    for (i=0; i<arrChecks.length; i++)
    {
        var attribute = arrChecks[i].getAttribute("xid")
        if (attribute == elementName)
        {
            // if the current state is checked, unchecked and vice-versa
            if (arrChecks[i].checked)
            {
                arrChecks[i].checked = false;
            } else {
                arrChecks[i].checked = true;
                alert("Checked!");
            }

        } else {
            arrChecks[i].checked = false;
        }
    }

 }


 </script>

在WebForm.cs内部

    protected void ButtonCheckDate_Click(object sender, EventArgs e)
    {
        SqlConnection conn = ConnectDB("Data Source=JACKSERVERA;Initial Catalog=tablea;User Id=tableuser;Password=tablepassword");


        if ((TextBox2.Text != null) && (TextBox2.Text != ""))
        {
            try
            {
                String res = "";

                SqlCommand command = conn.CreateCommand();
                SqlDataReader reader;
                command.CommandType = System.Data.CommandType.Text;
                command.CommandText = "SELECT * from overviewtable where [dated] = @PDATED";
                command.Parameters.AddWithValue("@PDATED", TextBox2.Text);
                command.Connection = conn;
                sqlstmt.Text = command.CommandText;

                conn.Open();
                reader = command.ExecuteReader();

                if (reader.HasRows)
                {
                    res = res + "<form name=\"input\" runat=\"server\"><table border=1>";
                    while (reader.Read())
                    {
                        res = res + "<tr>";


                        string thetime = (string)reader["time"];
                        string thevenue = (string)reader["venue"];
                        int numfreeseat = (int)reader["freeseat"];

                        int occupiedseat = 0;

                        SqlCommand bkcommand = conn.CreateCommand();
                        SqlDataReader bookinglist;
                        bkcommand.CommandType = System.Data.CommandType.Text;
                        bkcommand.CommandText = "SELECT count(*) from venuea where [dated] = @PDATED";
                        bkcommand.Parameters.AddWithValue("@PTIME", thetime);
                        bkcommand.Connection = conn;
                        sqlstmt.Text = bkcommand.CommandText;
                        bookinglist = bkcommand.ExecuteReader();

                        while (bookinglist.Read())
                        {
                            if (bookinglist.HasRows)
                            {
                                occupiedseat = (int)bookinglist.GetValue(0);
                            }
                        }


                        int leftnumofseat = numfreeseat - occupiedseat;

                        string color = "";
                        Boolean fullyoccupied = false;

                        if (leftnumofseat > 0)
                        {
                            if (leftnumofseat == numfreeseat)
                            {
                                // white
                                color = "#FFFFFF";
                            }
                            else
                            {
                                // light gray - partial occupied
                                color = "#B8B8B8";
                            }
                        }
                        else
                        {
                            // dark gray - fully occupied
                            color = "#505050";
                            fullyoccupied = true;
                        }


                        res = res + "<td bgcolor=\"" + color + "\">";
                        res = res + "Available: " + leftnumofseat + "/" + numfreeseat + "";
                        res = res + "</td>";

                        string checkboxval = TextBox2.Text + "_" + thetime + "_" + thevenue;

                        res = res + "<td>";
                        if (fullyoccupied == false)
                        {
                            res = res + "<input type=\"checkbox\" name=\"xid\" value=\"" + checkboxval + "\" runat=\"server\" />";
                        }
                        else
                        {
                            res = res + "FULL";
                        }
                        res = res + "</td>";

                        res = res + "</tr>";
                    }
                    res = res + "</table><input type=\"submit\" value=\"Submit\" OnClick=\"sub\" runat=\"server\"></form>";
                }
                LabelDateSelection.Text = res;

                conn.Close();



            }
            catch (Exception err)
            {
                errormsg.Text = err.Message;
            }
        }
        else
        {
            LabelDateSelection.Text = "Enter Date!";
        }



    }

Answer 1

从您的代码中删除此部分，并查看它是否可以运行runat=\\"server\\"

我不确定是否可以像尝试一样创建和ASP.net服务器控件，并且在服务器渲染runat=\\"server\\"时将输出发送到客户端。 检查您的HTML代码并查看其外观。

动态创建HTML控件或创建简单的HTML控件（如果可以的话）。

看这个例子，如何实际地创建控件

http://msdn.microsoft.com/zh-CN/library/kyt0fzt1%28v=vs.100%29.aspx

Answer 2

除了KnowledgeSeeker提出的要点外，您不能以该样式创建ASP控件。

您可以通过使用FindControl方法定位元素，然后从中获取值或在C＃添加代码中获取已创建复选框的值，类似于：

for (int i = 0; i < 5; i++)

{

CheckBox chk = new CheckBox();

chk.ID = Convert.ToString(i);

chk.Text = Convert.ToString(i);

form1.Controls.Add(chk);

}

在这种情况下，您要从0循环到5，并创建复选框并将这些控件添加到表单中。