Question

我需要一个递归函数，它可以找到页面上的所有控件，并允许我根据控件类型添加javascript控件属性。

问题是我有一个页面，其中有几个面板有控件。面板甚至可以嵌套面板/控件。

不幸的是，以下内容没有达到我想要的效果，但我正在寻找类似的东西......

                Action<Control> traverse = null;

                //in a function:
                traverse = (ctrl) =>
                {
                    //ctrl.Enabled = false; //or whatever action you're performing
                    foreach (Control c in ctrl.Controls)
                    {
                        Response.Write(c.GetType().ToString() + " : " + c.ID.ToString() + "<br />");

                        if (c.GetType() == typeof(TextBox))
                        {
                            ((TextBox)(c)).Attributes["onKeypress"] = "javascript:return FormEdited();";
                        }
                        else if (c.GetType() == typeof(DropDownList))
                        {
                            ((DropDownList)(c)).Attributes["onchange"] = "javascript:return FormEdited();";
                        }
                        else if (c.GetType() == typeof(CheckBox))
                        {
                            ((CheckBox)(c)).Attributes["onClick"] = "javascript:return FormEdited();";
                        }

                    }

                    traverse = (ctrl2) => ctrl.Controls.GetEnumerator();
                };

Answer 1

这应该有效：

public void traverse(Control ctl)
{
    foreach (Control c in ctl.Controls) 
    {
        System.Diagnostics.Debug.WriteLine(c.GetType().ToString());
        //Response.Write(c.GetType().ToString() + " : " + c.ID.ToString() + "<br />"); 
        if (c.GetType() == typeof(TextBox)) 
        { ((TextBox)(c)).Attributes["onKeypress"] = "javascript:return FormEdited();"; 
        } 
        if (c.GetType() == typeof(DropDownList)) 
        { ((DropDownList)(c)).Attributes["onchange"] = "javascript:return FormEdited();"; 
        } 
        else if (c.GetType() == typeof(CheckBox)) 
        { ((CheckBox)(c)).Attributes["onClick"] = "javascript:return FormEdited();"; 
        }
        traverse(c);
    }
}

然后用：

调用它

traverse(this.Page);

即

protected void Page_Load(object sender, EventArgs e)
{
   traverse(this.Page);
}

递归查找页面控件并添加属性？

1 个答案: