- ASP.NET TREEVIEW HOW TO
- ASP.NET TREEVIEW CODE
- ASP.NET TREEVIEW PROFESSIONAL
- ASP.NET TREEVIEW DOWNLOAD
Label1.Text=”You selected DCOM category” Label1.Text=”You selected Smart Client category” Label1.Text=”You selected ActiveX category” Label1.Text=”You selected Windows Forms category” Label1.Text=”You selected Web Services category” Label1.Text=”You selected ASP.NET category”
ASP.NET TREEVIEW CODE
To trap such a selection, write the following code in the Page_Load event of the Web form: protected void Page_Load(object sender, EventArgs e) When you set the NavigateUrl property, you are directly navigated to the destination page. This happens because the SelectedNodeChanged event is raised only for the nodes that do not have NavigateUrl property set. If you run the sample at this stage, it will work as expected for nodes that do not have the NavigateUrl property set and fail for the other nodes. In a similar fashion, you can retrieve the Value property of the selected node. Notice how you retrieved the Text of the selected node. In the code, you simply set the Text property of the label to some message. The SelectedNodeChanged event is raised when you click on the TreeNode. Now, write the following code in the SelectedNodeChanged event of the TreeView control: protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e) Once you finish the visual design of the TreeView, the resultant markup generated should resemble the following: Īs you can see, the Value property contains the same text as the Text property by default. In this example, you will enter the NavigateUrl property to ~/example1.aspx?id=1 for the ASP.NET node, ~/example1.aspx?id=2 for the Web services node, and so on. For each node, set Text and NavigateURL properties to appropriate values. Using the toolbar of the dialog, add tree nodes as shown in Figure 2. When you select “Edit Nodes…” the IDE will open the TreeView Node Editor dialog (see Figure 2). From the smart tags of TreeView (see Figure 1), select “Edit Nodes”. Drag and drop a TreeView control and a Label control on it.
ASP.NET TREEVIEW DOWNLOAD
( Click here to download the accompanying code for the examples.)Ĭreate a new Web site in VS.NET or Visual Web Developer (VWD).
ASP.NET TREEVIEW HOW TO
Now that you know some basics of TreeView and TreeNode, you can follow the first example, which illustrates how to set up the TreeView manually. This property indicates the text that is displayed when the user hovers the mouse over the TreeNode image. This property indicates the text that is displayed when the user hovers the mouse over the TreeNode text. This property points to the image file that is displayed for the node. This property indicates the destination for the URL represented by the NavigateUrl property (new windows, current windows, and so forth). This property points to the URL of the page where the user is navigated after clicking on the node. This property specifies a value that can be accessed programmatically when the node is clicked or expanded. This property specifies the text that appears for that node.
The following table lists some of the important properties of TreeNode class: The tree nodes are represented in the markup by tag. TreeView consists of one or more nodes represented by the TreeNode class. The TreeView control is represented by the mark tag and the corresponding class .WebControls.TreeView. TreeView comes handy in all such cases.īefore delving into the details of TreeView, get acquainted with the basics first. You may want to display them in certain categories such as Products, Services, and Support. The same categorization is applicable for the Web site pages. You may want to arrange the product information on category and subcategory bases. For example, suppose your Web site sells products that belong in various categories. This article examines the TreeView control, which you use to display hierarchical data. They provide not only good-looking navigational structure but also save developers from needing to write lots of code and script. Fortunately, ASP.NET 2.0 comes with these controls built-in. In classic ASP, developers used either custom code or third-party solutions to provide navigational elements such as TreeViews and Menus.
ASP.NET TREEVIEW PROFESSIONAL
Real-world Web sites need professional navigation structures.