動態創建的按鈕不會觸發其單擊事件

我有一個動態頁面，其中包含一個包含內容的面板。我點擊按鈕添加一個新面板。使用動態添加面板中的按鈕，點擊事件不會觸發。動態創建的按鈕不會觸發其單擊事件

下面是表單代碼：

<form id="form1" runat="server"> 
<div> 
<asp:ScriptManager ID="ScriptManager1" runat="server"> 
</asp:ScriptManager> 

      <asp:Panel ID="MainPanel" runat="server"> 
      </asp:Panel> 

</div> 
</form>

這是創建一些面板和子按鈕（step_button）代碼：

public partial class _Default : System.Web.UI.Page 
{ 


    Button button = new Button() { Text="Add level1"}; 
    static int controls = 1; 



    private List<ActionPanel> PanelsList 
    { 
     get 
     { 
      if (Session["DataActionsPanels"] == null) 
       Session["DataActionsPanels"] = new List<ActionPanel>(); 
      return (List<ActionPanel>)Session["DataActionsPanels"]; 
     } 
    } 


    protected void Page_Load(object sender, EventArgs e) 
    { 
     button.Click += new EventHandler(button_Click); 
     button.Attributes.Add("style", "float:right;"); 
     button.ID = "button1"; 
     MainPanel.Controls.Add(button); 


     if (IsPostBack) 
     { 
      RestorePanels(); 
      return; 
     } 
     AddActionPanel(); 

    } 



    protected void RestorePanels() 
    { 
     foreach (ActionPanel panel in PanelsList) 
      AddActionPanel(panel); 
    } 




    protected void button_Click(object sender, EventArgs e) 
    { 
     controls++;    
     AddActionPanel(); 
    } 


    protected void AddActionPanel() 
    { 
     var panel = new ActionPanel(controls, ScriptManager1); 
     PanelsList.Add(panel); 
     var button_index = MainPanel.Controls.IndexOf(button); 
     MainPanel.Controls.AddAt(button_index, panel.GetPanel()); 
    } 

    protected void AddActionPanel(ActionPanel panel) 
    { 
     var button_index = MainPanel.Controls.IndexOf(button); 
     MainPanel.Controls.AddAt(button_index, panel.GetPanel()); 
    } 
} 


public class ActionPanel 
{ 

    private Panel main_panel = new Panel(); 
    private TextBox data_action_id_box = new TextBox(); 
    private TextBox data_action_name_box = new TextBox(); 
    private TextBox data_action_error_box = new TextBox() ; 
    Button step_button = new Button() { Text = "Add level2"}; 
    private Panel steps_panel = new Panel(); 
    private List<StepPanel> steps_list = new List<StepPanel>(); 
    private int step_count = 1; 
    private ScriptManager _manager; 
    public ActionPanel(int i, ScriptManager manager) 
    { 

     _manager = manager; 
     main_panel.Attributes.Add("style", "float:left; width:100%"); 
     main_panel.GroupingText = "TestLevel " + i; 
     main_panel.Controls.Add(new Label() { Text = "TestLevel1" }); 
     data_action_id_box.Attributes.Add("style", "margin-left:13px"); 
     main_panel.Controls.Add(data_action_id_box); 
     main_panel.Controls.Add(new Literal() { Text = "<br></br>" }); 

     main_panel.Controls.Add(new Label() { Text = "TestLevel11" }); 
     data_action_name_box.Attributes.Add("style", "margin-left:10px"); 
     main_panel.Controls.Add(data_action_name_box); 
     main_panel.Controls.Add(new Literal() { Text = "<br></br>" }); 

     main_panel.Controls.Add(new Label() { Text = "TestLevel11" }); 
     data_action_error_box.Attributes.Add("style", "margin-left:33px"); 
     main_panel.Controls.Add(data_action_error_box); 
     main_panel.Controls.Add(new Literal() { Text = "<br></br>" }); 

     step_button.ID = "button2_"+i; 
     step_button.Click += new EventHandler(AddStep_Click); 
     step_button.Attributes.Add("style", "float:right;"); 
     steps_panel.Controls.Add(step_button); 
     steps_panel.Load += new EventHandler(steps_panel_Load); 
     main_panel.Controls.Add(steps_panel); 

     main_panel.Load += new EventHandler(steps_panel_Load); 

     steps_panel.Attributes.Add("style", "float:left; width:100%"); 
     AddStepPanel(); 

    } 

    void steps_panel_Load(object sender, EventArgs e) 
    { 



    } 

    public void AddStep_Click(object sender, EventArgs e) 
    { 
     step_count++; 
     AddStepPanel(); 
    } 

    public Panel GetPanel() 
    { 

     return main_panel; 
    } 

    private void AddStepPanel() 
    { 
     var panel = new StepPanel(step_count); 
     steps_list.Add(panel); 
     var button_index = steps_panel.Controls.IndexOf(step_button); 
     steps_panel.Controls.AddAt(button_index, panel.GetPanel()); 
    } 

    private void AddStepPanel(StepPanel panel) 
    { 
     var button_index = steps_panel.Controls.IndexOf(step_button); 
     steps_panel.Controls.AddAt(button_index, panel.GetPanel()); 
    } 
} 



public class StepPanel 
{ 

    private Panel main_panel = new Panel(); 
    private DropDownList step_type_box = new DropDownList(); 
    private TextBox step_name_box = new TextBox(); 
    private TextBox step_error_box = new TextBox() ; 
    private Panel step_panel = new Panel(); 

    public StepPanel(int i) 
    { 
     main_panel.Attributes.Add("style", "float:left; width:100%"); 
     main_panel.GroupingText = "TestLevel2 " + i; 
     main_panel.Controls.Add(new Label() { Text = "TestLevel2" }); 

     step_type_box.Items.Add("TestLevel2"); 
     step_type_box.Items.Add("TestLevel22"); 
     step_type_box.Items.Add("TestLevel222"); 
     step_type_box.Items.Add("TestLevel2222"); 
     step_type_box.Attributes.Add("style", "margin-left:13px"); 

     main_panel.Controls.Add(step_type_box); 

     var label1 = new Label() { Text = "TestLevel22" }; 
     label1.Attributes.Add("style","margin-left:20px;"); 
     main_panel.Controls.Add(label1); 
     step_name_box.Attributes.Add("style", "margin-left:10px"); 
     main_panel.Controls.Add(step_name_box); 

     var label2 = new Label() { Text = "TestLevel222" }; 
     label2.Attributes.Add("style", "margin-left:20px;"); 
     main_panel.Controls.Add(label2); 
     step_error_box.Attributes.Add("style", "margin-left:33px"); 
     main_panel.Controls.Add(step_error_box); 

    } 

    public Panel GetPanel() 
    { 

     return main_panel; 
    } 

}

我怎樣才能使這項工作？

來源

2012-08-22 user1617785

'靜態int控制= 1;'意味着在您的web應用程序的每個用戶將具有相同的控制計。改用ViewState或Session。 –

[真正理解動態控件]（http://tinyurl.com/yfc66o） – Oded

「static int controls = 1;意味着你的web應用程序中的每個用戶將具有相同的控制計數，改爲使用ViewState或Session。 Schmelter 10小時前「我可以使用PanelsList.Count – user1617785

您正在添加面板onload，在init或preinit上執行。這是微軟的建議。

來源

2012-08-22 18:25:51

我解決了我的問題。

我誤會我使用保存在Session中的面板。所有動態控件都必須在Postback中重新創建。

所以我更新方法「AddActionPanel（ActionPanel面板）」：

protected void AddActionPanel(ActionPanel panel) 
    { 
     var count = PanelsList.IndexOf(panel); 
     var panel1 = new ActionPanel(count, ScriptManager1); 

     var button_index = DataActionsPanel.Controls.IndexOf(button); 
     DataActionsPanel.Controls.AddAt(count, panel1.GetPanel()); 
    }

來源

2012-08-23 10:45:46 user1617785

動態創建的按鈕不會觸發其單擊事件

回答

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