动态按钮没有触发 [英] Dynamic buttons not firing

问题描述

设计：



label1 textbox1 button1 点击button1然后



label1 textbox1 button1

label2 textbox2 button2 点击button2然后





label1 textbox1 button1

label2 textbox2 button2

label3 textbox3 button3 点击按钮3然后





添加 label4，textbox4，button4 上面的控制和



。

。

。

。





怎么做到这一点??

我试过但点击了动态生成按钮，控件消失了。

我用过：

aspx：

Design:

label1 textbox1 button1 click on button1 then

label1 textbox1 button1
label2 textbox2 button2 click on button2 then


label1 textbox1 button1
label2 textbox2 button2
label3 textbox3 button3 click on button3 then


adds label4,textbox4 , button4 to above controls and

.
.
.
.


How to achieve this??
I tried but on clicking the dynamically generated button, the controls are getting vanished.
I used:
aspx:

<table border="1" cellpadding="0" cellspacing="0" id="tblGenerate" runat="server">
        <tr>
          <td>
              <asp:Label ID="lblName" runat="server" Text="Name"></asp:Label>
          </td>
          <td>
              <asp:TextBox ID="txtName" runat="server"></asp:TextBox>
          </td>
          <td>
              <asp:Button ID="btnAdd" runat="server" Text="Add New" OnClick="btnAdd_Click"/>
          </td>
          <td>
              <asp:Label ID="lblCost" runat="server"></asp:Label>
          </td>
      </tr>
      <tr>
          <td  id="trGenerate" runat="server" colspan="3">
          </td>
      </tr>
  </table>

aspx.cs：

aspx.cs:

protected void Page_Load(object sender, EventArgs e)
        {
 
        }

        protected void Page_Init(object sender, EventArgs e)
        {
            //Recreate Controls
            RecreateControls("lblName", "Label");
            RecreateControls("txtValue", "TextBox");
            RecreateControls("btnAddNew", "Button");
        }

        protected void btnAdd_Click(object sender, EventArgs e)
        {
            int cnt = FindOccurence("txtValue");

            CreateLabel("lblName_" + Convert.ToString(cnt + 1));
            CreateTextBox("txtValue_" + Convert.ToString(cnt + 1));
            CreateButton("btnAddNew_" + Convert.ToString(cnt + 1));



            //ClientScript.RegisterClientScriptBlock(this.GetType(), "Alert",

            //             "<script type = 'text/javascript'>alert('" + ID +

            //              " fired OnTextChanged event5');</script>");
        }

        private int FindOccurence(string substr)
        {

            string reqstr = Request.Form.ToString();

            return ((reqstr.Length - reqstr.Replace(substr, "").Length)

                              / substr.Length);

        }

        private void CreateTextBox(string ID)
        {
            TextBox txt = new TextBox();

            txt.ID = ID;

            trGenerate.Controls.Add(txt);

            Label lblInstance = new Label();

            lblInstance.Width = 10;

            lblInstance.Height = 20;

            trGenerate.Controls.Add(lblInstance);

        }

        private void CreateLabel(string ID)
        {
            Label lblInstance = new Label();

            lblInstance.ID = ID;

            lblInstance.Text = "Name";

            lblInstance.Width = 50;

            trGenerate.Controls.Add(lblInstance);
        }

        private void CreateButton(string ID)
        {
            Button btnAddtxt = new Button();

            btnAddtxt.ID = ID;

            btnAddtxt.Text = "Add New";

            btnAddtxt.Click += new System.EventHandler(btnAdd_Click);

            btnAddtxt.CausesValidation = true;

            trGenerate.Controls.Add(btnAddtxt);

            Literal lt = new Literal();

            lt.Text = "<br />";

            trGenerate.Controls.Add(lt);
        }

         

        private void RecreateControls(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);

                            }



                            if (ctrlType == "Label")
                            {

                                CreateLabel(ctrlID);

                            }


                            if (ctrlType == "Button")
                            {
                                CreateButton(ctrlID);
                            }
                        }

                    }

                }

            }

        }
 
    }

推荐答案

如果每次你想要创建一些控件然后创建单个控件然后动态添加该用户控件是很好的。还要确保每次回发都会从代码隐藏中重新生成控件。



请检查您已添加的控件是否在回发后绑定了​​它的事件。在那里添加断点并监视。



希望你得到你的决议。



祝你好运

Hi,

If everytime you want to create some number of controls then it is good to create single control and then add that user control dynamically. also make sure for every postback your control is regenerated from the codebehind.

please check for controls that you already have added binding it''s event after postback. add breakpoint there and monitor.

hope you got your resolution.

best luck

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