树视图选择节点已更改事件 [英] Tree view selected node changed event

问题描述

我正在进行树视图控制，并且我在所选节点更改事件中执行了一些操作。

当我在运行时单击节点时，事件未触发。这是我正在使用的代码。

断点在运行时没有被击中。

  protected   void  tvData_SelectedNodeChanged（ object  sender，EventArgs e）
 {
  if （tvData.SelectedNode.Text ==  < span class =code-string> Country）
 {
 tdCtry.Visible =  false ; 
} 
  else  
 {
 tdCtry.Visible =  true ; 
} 
} 

有谁能告诉我需要做什么？

解决方案

< blockquote>有一些文章围绕这个主题可以找到。你需要强制回发到TreeView。



你需要先创建一个强制JavaScript函数：

  function  forcePostBack（）{
  var  yourObject = 窗口 .event.srcElement; 
  if （yourObject .tagName ==   INPUT&& yourObject.type ==  复选框）{
 __doPostBack（ ， ）; 
} 
} 

在页面加载方法之后，您需要为TreeView添加click事件

 受保护  void  Page_Load（ object  sender，EventArgs e）
 {
 tvData.Attributes.Add（  onclick，  forcePostBack（））; 
} 

需要使用TreeNodeCheckChanged事件而不是SelectedNodeChanged后如下：

< pre lang =cs> protected void tvData_TreeNodeCheckChanged（ object sender，TreeNodeEventArgs e）
{
// 以这种方式更容易设置可见性
tdCtry.Visible =！tvData.SelectedNode.Text.Equals（ Country< /跨度>）;
}

如果有效，请告诉我！

I am having a tree view control and i doing some operation in the selected node changed event.
The event is not firing when i click in the node at runtime. This is the code i am using.
The break point is not getting hit at runtime.

protected void tvData_SelectedNodeChanged(object sender, EventArgs e)
        {
            if (tvData.SelectedNode.Text == "Country")
            {
                tdCtry.Visible = false;
            }
            else
            {
                tdCtry.Visible = true;
            }
        }

Can anyone tell me what needs to be done?

解决方案

There are some articles what you can find around this topic. You need to force postback to your TreeView.

You need to create a forcing JavaScript function first:

function forcePostBack() {
    var yourObject = window.event.srcElement;
    if (yourObject .tagName == "INPUT" && yourObject.type == "checkbox") {
           __doPostBack("","");
    } 
}

After in page load method you need to add click event for your TreeView

protected void Page_Load(object sender, EventArgs e)
{
    tvData.Attributes.Add("onclick", "forcePostBack()");
}

After you need to use TreeNodeCheckChanged event instead of SelectedNodeChanged as follow:

protected void tvData_TreeNodeCheckChanged(object sender, TreeNodeEventArgs e)
{
    //in this way easier to set visibility
    tdCtry.Visible = !tvData.SelectedNode.Text.Equals("Country");
}

Please let me know if it's working or not!

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