Asp.net Treeview checkbox

Private void display ()
{
Dt = new tsorganize (). organizeds ();
Dataview DV = new dataview (DT );
Treenode nodes = new treenode ();
Nodes. Text = "cross-strait coffee ";
Nodes. value = "0 ";
If (Dt. Rows. Count> = 1)
{
DV. rowfilter = "fparentid = ''";
If (DV. Count> = 1)
{
Foreach (datarowview drrow in DV)
{
Treenode nodel = new treenode ();
Nodel. Text = drrow. Row ["forgname"]. tostring ();
Nodel. value = drrow. Row ["forgno"]. tostring ();
Nodes. childnodes. Add (nodel );
Nodelist (DV, nodel, drrow. Row ["forgno"]. tostring ());
}
}
}
Treevlist. nodes. Add (nodes );
}

// Spanning Tree
private void nodelist (dataview DV, treenode node, string parentid)
{< br> DV. rowfilter = "fparentid = '" + parentid. tostring () + "'";
If (DV. count> = 1)
{< br> foreach (datarowview drrow in DV)
{< br> treenode nodel = new treenode ();
nodel. TEXT = drrow. row ["forgname"]. tostring ();
nodel. value = drrow. row ["forgno"]. tostring ();
node. childnodes. add (nodel);
nodelist (DV, nodel, drrow. row ["forgno"]. tostring ());
}< BR >======================= =========================================================< br> 1.
treenodecollection TNC = treevlist. checkednodes;
// retrieve all selected nodes in the tree
private void getchecknode (treenodecollection TNC)
{< br> foreach (treenode node in TNC)
{< br> If (node. checked)
{< br> If (node. childnodes. count = 0)
{< br> datarow DR = tblselchains. newrow ();
Dr ["forgno"] = node. value;
Dr ["forgname"] = node. text. tostring ();
tblselchains. rows. add (DR);
}< BR >}

2. Based on the value in the database, set the checked value to true for the corresponding node.

/// <Summary>
/// Dtploystore: Table (stores data read from the database)
/// <Para> </para>
/// </Summary>
Treenodecollection TNC = treevlist. nodes;
If (dtploystore! = NULL)
{
If (dtploystore. Rows. Count> 0)
{
For (INT I = 0; I <dtploystore. Rows. Count; I ++)
{
Getselectedtreenode (TNC, dtploystore. Rows [I] ["forgno"]. tostring ());
}
}
}
/// <Summary>
/// Traverse the store tree to obtain the selected node
/// <Para> </para>
/// </Summary>
/// <Param name = "TNC"> </param>
Public void getselectedtreenode (treenodecollection TNC, string checkdata)
{
Foreach (treenode node in TNC)
{
If (node. Checked)
{
Node. Checked = true;
Break;
}
Getselectedtreenode (node. childnodes, checkdata );
}
}

3. Javascript selects the parent node, and the child node is automatically selected
/// Add attributes to the Treeview in the background
/// This. treevlist. Attributes. Add ("onclick", "ontreenodechecked ()");

/// The following is written in the front-end Javascript
Function ontreenodechecked (){
VaR ele = Window. event. srcelement;
If (Ele. type = 'checkbox '){
VaR childrendivid = ELE. Id. Replace ('checkbox', 'nodes ');
VaR DIV = Document. getelementbyid (childrendivid );
If (DIV = NULL) return;
VaR checkboxs = div. getelementsbytagname ('input ');
For (VAR I = 0; I <checkboxs. length; I ++ ){
If (checkboxs [I]. type = 'checkbox ')
Checkboxs [I]. Checked = ELE. checked;
}
}
4. display the checkbox on the Treeview, which is actually very simple. You only need to set showcheckboxes = "all"
If we want to display the treeviw's set layer, we can set expanddepth = "N" (N is a number, that is, the number of layers you want to display, 0 is all layers)