Treeview unrefresh expansion and contraction

1. Of course there is a Treeview. The ID here is namedTreeviewtype

< ASP: Treeview ID = " Treeviewtype " Runat = " Server " Expanddepth = " 1 " > </ ASP: Treeview >

 

2. Then, two buttons are required.TreeviewexpandcollapseallThis is the js method, which will be introduced later

< Input type = " Button " Value = " Expand "   Class = " But1 " Onclick = " Treeviewexpandcollapseall ('<% = treeviewtype. clientid %>', true) "   />
< Input type = " Button " Value = " Shrink "   Class = " But1 " Onclick = " Treeviewexpandcollapseall ('<% = treeviewtype. clientid %>', false) "   />

 

3. The most critical js method is coming.

/*
* Tree expansion and contraction method 2010-03-23 PM by wqy
* Treeviewid: Tree object
* Expandall: expand or contract
*/
Function treeviewexpandcollapseall (treeviewid, expandall ){
VaR displaystate = (Expandall =   True   ?   " None " : " Block " );
VaR Treeview = Document. getelementbyid (treeviewid );
If (Treeview ){
VaR treelinks = Treeview. getelementsbytagname ( " A " );
VaR nodecount = Treelinks. length;

For (I =   0 ; I < Nodecount; I ++ ){
If (Treelinks [I]. firstchild. tagname ){
If (Treelinks [I]. firstchild. tagname. tolowercase () =   " IMG " ){
VaR currenttogglelink = Treelinks [I];
VaR childcontainer = Getparentbytagname ( " Table " , Currenttogglelink). nextsibling;
If (Childcontainer. style. Display = displaystate) {
eval (currenttogglelink. href);
}< BR >}

Function getparentbytagname (parenttagname, childelementobj ){
VaR parent=Childelementobj. parentnode;
While(Parent. tagname. tolowercase ()! =Parenttagname. tolowercase ()){
Parent=Parent. parentnode;
}
ReturnParent;
}