动态控制创建中的设计问题
本文关键字：问题 创建 动态控制 | 更新日期: 2023-09-27 18:16:36
我正在创建一个动态控件，我有一个下拉菜单选项"文本框，复选框，下拉框，标签"当用户从下拉菜单中选择任何这些选项时，控件被创建
假设我通过从下拉菜单中选择选项来创建这样的控件。
1: text box
2: drop down
3: text box:
4: dropdown
但是在页面输出中显示如下:
1: textbox
2: textbox
3: dropdown
4: dropdown
根据上面选择的顺序，这不是正确的顺序。
问题是这个设计不太对。
当我重新创建控件时，我根据它们的类型重新创建控件:文本框，然后下拉菜单
请找到附加的代码，任何建议如何解决这个问题将是有帮助的。
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Dynamiccontrol.aspx.cs" Inherits="Dynamic_controls.Dynamiccontrol" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:DropDownList ID="ddlcontrols" runat="server" AutoPostBack="True"
onselectedindexchanged="ddlDynamic_SelectedIndexChanged">
<asp:ListItem>--Select--</asp:ListItem>
<asp:ListItem>Textbox</asp:ListItem>
<asp:ListItem>Dropdown</asp:ListItem>
</asp:DropDownList>
</div>
</form>
</body>
</html>
In.cs代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace Dynamic_controls
{
public partial class Dynamiccontrol : System.Web.UI.Page
{
Panel pnlTextBox;
protected void Page_PreInit(object sender, EventArgs e)
{
//Create a Dynamic Panel
pnlTextBox = new Panel();
pnlTextBox.ID = "pnlTextBox";
pnlTextBox.BorderWidth = 1;
pnlTextBox.Width = 800;
pnlTextBox.Height = 800;
this.form1.Controls.Add(pnlTextBox);
RecreateTxtControls("txtDynamic", "TextBox");
RecreateDDLControls("ddlDynamic", "DropDownList");
RecreateChkControls("chkDynamic", "CheckBox");
}
protected void Page_Load(object sender, EventArgs e)
{
}
private int FindOccurence(string substr)
{
string reqstr = Request.Form.ToString();
return ((reqstr.Length - reqstr.Replace(substr, "").Length) / substr.Length);
}
private int FindOccurenceCheckbox(string substr)
{
string reqstr = Request.Form.ToString();
substr = "chkDynamic";
return ((reqstr.Length - reqstr.Replace(substr, "").Length) / substr.Length);
}
private int FindOccurenceLabel(string substr)
{
string reqstr = Request.Form.ToString();
substr = "lblDynamic";
return ((reqstr.Length - reqstr.Replace(substr, "").Length) / substr.Length);
}
private void RecreateTxtControls(string ctrlPrefix, string ctrlType)
{
string[] ctrls = Request.Form.ToString().Split('&');
int cnt = FindOccurence(ctrlPrefix);
if (cnt > 0)
{
for (int k = 1; k <= cnt; k++)
{
for (int i = 0; i < ctrls.Length; i++)
{
if (ctrls[i].Contains(ctrlPrefix + "-" + k.ToString()) && !ctrls[i].Contains("EVENTTARGET"))
{
string ctrlID = ctrls[i].Split('=')[0];
if (ctrlType == "TextBox")
{
CreateTextBox(ctrlID);
}
break;
}
}
}
}
}
private void RecreateDDLControls(string ctrlPrefix, string ctrlType)
{
string[] ctrls = Request.Form.ToString().Split('&');
int cnt = FindOccurence(ctrlPrefix);
if (cnt > 0)
{
for (int k = 1; k <= cnt; k++)
{
for (int i = 0; i < ctrls.Length; i++)
{
if (ctrls[i].Contains(ctrlPrefix + "-" + k.ToString()) && !ctrls[i].Contains("EVENTTARGET"))
{
string ctrlID = ctrls[i].Split('=')[0];
if (ctrlType == "DropDownList")
{
CreateDropDownList(ctrlID);
}
break;
}
}
}
}
}
private void RecreateChkControls(string ctrlPrefix, string ctrlType)
{
string[] ctrls = Request.Form.ToString().Split('&');
// ctrlPrefix = "chkDynamic";
int cnt = FindOccurenceCheckbox(ctrlPrefix);
if (cnt > 0)
{
for (int k = 1; k <= cnt; k++)
{
for (int i = 0; i < ctrls.Length; i++)
{
if (ctrls[i].Contains(ctrlPrefix + "-" + k.ToString()) && !ctrls[i].Contains("EVENTTARGET"))
{
string ctrlID = ctrls[i].Split('=')[0];
if (ctrlType == "CheckBox")
{
CreateCheckbox(ctrlID);
}
break;
}
}
}
}
}
private void ReqFieldValidator(string ctrlPrefix, string ctrlType)
{
string[] ctrls = Request.Form.ToString().Split('&');
// ctrlPrefix = "chkDynamic";
int cnt = FindOccurenceCheckbox(ctrlPrefix);
if (cnt > 0)
{
for (int k = 1; k <= cnt; k++)
{
for (int i = 0; i < ctrls.Length; i++)
{
if (ctrls[i].Contains(ctrlPrefix + "-" + k.ToString()) && !ctrls[i].Contains("EVENTTARGET"))
{
string ctrlID = ctrls[i].Split('=')[0];
if (ctrlType == "RequiredFieldValidator")
{
CreateCheckbox(ctrlID);
}
break;
}
}
}
}
}
private void ReqLabel(string ctrlPrefix, string ctrlType)
{
string[] ctrls = Request.Form.ToString().Split('&');
int cnt = FindOccurenceCheckbox(ctrlPrefix);
if (cnt > 0)
{
for (int k = 1; k <= cnt; k++)
{
for (int i = 0; i < ctrls.Length; i++)
{
if (ctrls[i].Contains(ctrlPrefix + "-" + k.ToString()) && !ctrls[i].Contains("EVENTTARGET"))
{
string ctrlID = ctrls[i].Split('=')[0];
if (ctrlType == "Label")
{
CreateLabel(ctrlID);
}
break;
}
}
}
}
}
private void CreateLabel(string ID)
{
Label lbl = new Label();
lbl.ID = ID;
lbl.Text = "text";
pnlTextBox.Controls.Add(lbl);
Literal lt = new Literal();
lt.Text = "<br />";
pnlTextBox.Controls.Add(lt);
}
private void CreateTextBox(string ID)
{
//CreateLabel(ID);
TextBox txt = new TextBox();
txt.ID = ID;
pnlTextBox.Controls.Add(txt);
// txt.AutoPostBack = true;
// txt.TextChanged += new EventHandler(OnTextChanged);
RequiredFieldValidator req = new RequiredFieldValidator();
req.ControlToValidate = txt.ID;
req.EnableViewState = false;
pnlTextBox.Controls.Add(txt);
Literal lt = new Literal();
lt.Text = "<br />";
}
private void CreateCheckbox(string ID)
{
CheckBox chk = new CheckBox();
chk.ID = ID;
chk.Checked = true;
chk.CheckedChanged += new EventHandler(chk_CheckedChanged);
chk.AutoPostBack = true;
chk.EnableViewState = false;
pnlTextBox.Controls.Add(chk);
Literal lt = new Literal();
lt.Text = "<br />";
pnlTextBox.Controls.Add(lt);
}
void chk_CheckedChanged(object sender, EventArgs e)
{
try
{
}
catch (Exception ex)
{
}
}
private void CreateDropDownList(string ID)
{
DropDownList ddl = new DropDownList();
ddl.ID = ID;
ddl.Items.Add(new ListItem("--Select--", ""));
ddl.Items.Add(new ListItem("One", "1"));
ddl.Items.Add(new ListItem("Two", "2"));
ddl.Items.Add(new ListItem("Three", "3"));
// ddl.AutoPostBack = true;
ddl.EnableViewState = false;
// ddl.SelectedIndexChanged += new EventHandler(OnSelectedIndexChanged);
pnlTextBox.Controls.Add(ddl);
//int cnt2 = FindOccurence("CheckBox");
//CreateCheckbox("CheckBox-" + Convert.ToString(cnt2 + 1));
Literal lt = new Literal();
lt.Text = "<br />";
pnlTextBox.Controls.Add(lt);
}
private void CreateRequiredFieldValidator(string ID)
{
RequiredFieldValidator req = new RequiredFieldValidator();
req.ID = ID;
// ddl.AutoPostBack = true;
// ddl.SelectedIndexChanged += new EventHandler(OnSelectedIndexChanged);
pnlTextBox.Controls.Add(req);
Literal lt = new Literal();
lt.Text = "<br />";
pnlTextBox.Controls.Add(lt);
}
protected void OnTextChanged(object sender, EventArgs e)
{
TextBox txt = (TextBox)sender;
string ID = txt.ID;
ClientScript.RegisterClientScriptBlock(this.GetType(), "Alert", "<script type = 'text/javascript'>alert('" + ID + " fired OnTextChanged event');</script>");
//Place the functionality here
}
protected void ddlDynamic_SelectedIndexChanged(object sender, EventArgs e)
{
if (ddlcontrols.SelectedValue == "Textbox")
{
int cnt = FindOccurence("txtDynamic");
CreateTextBox("txtDynamic-" + Convert.ToString(cnt + 1));
int cntChk = FindOccurenceCheckbox("CheckBoxdll");
CreateCheckbox("chkDynamic-" + Convert.ToString(cntChk + 1));
}
if (ddlcontrols.SelectedValue == "Dropdown")
{
int cnt = FindOccurence("ddlDynamic");
CreateDropDownList("ddlDynamic-" + Convert.ToString(cnt + 1));
int cntChk = FindOccurenceCheckbox("chkDynamic");
CreateCheckbox("chkDynamic-" + Convert.ToString(cntChk + 1));
}
}
}
}
我不知道你的问题是什么。你的代码显然是一次创建一种类型的所有控件，所以这就是我希望在你的页面输出中看到的。
如果你想交错的控件，那么你需要改变你的算法，一个一个地处理控件，而不是按类型。