When we set ShowCheckBoxes="All", we would like to provide a feature where people can select the checkbox on the Root Node so that all the other checkboxes are checked automatically. Basically, when the parent node is checked, all the child nodes should be checked automatically.
It would be intuitive to accomplish this task at the client side without involving a postback.
The following code snippet helps in accomplishing the same.
TreeView Declaration
<asp:TreeView ID="TreeView1" Runat="server" DataSourceID="XmlDataSource1" onclick="client_OnTreeNodeChecked();" ShowCheckBoxes="all">
<DataBindings>
<asp:TreeNodeBinding DataMember="Category" ValueField="ID" TextField="Name"></asp:TreeNodeBinding>
<asp:TreeNodeBinding DataMember="Description" ValueField="Value" TextField="Value"></asp:TreeNodeBinding>
</DataBindings>
</asp:TreeView>
In the above TreeView declaration Code, you can find the property onclick="client_OnTreeNodeChecked();" event which actually is the JavaScript function which would accomplish this task.
The Javascript Code snippet is as follows:-
全选Javascript
}
}