Expand all child nodes of the recursive tree

[Former Member]

Hi everybody,

I have a problem by implementing of the action to expand all child nodes of the recursive tree and need your help.

I used the TuTWD_Tree example project provided by SAP. What I want to reach is to expand all the child nodes of the recursive tree (TheTree) by clicking the ToolBarButton.

I did the following jobs:

- I added a ToolBarButton named "EXPAND" in the TreeView.

- Then I implemented the onActionExpandNodes(). The codes I wrote in the onActionExpandNodes are as following:

...

IPrivateTreeView.ITreeNodeNode rootNode = wdContext.nodeTreeNode();

for (int i = 0; i < rootNode.size(); i++){

IPrivateTreeView.ITreeNodeElement element = (IPrivateTreeView.ITreeNodeElement)rootNode.

getElementAt(i);

element.setIsExpanded(true);

IPrivateTreeView.ITreeNodeNode subNode = element.nodeChildNode();

if (!subNode.isEmpty()){

for(int n = 0; n < subNode.size(); n++){

IPrivateTreeView.ITreeNodeElement element1 = (IPrivateTreeView.ITreeNodeElement)subNode.getElementAt(n);

if (element1 != null){

element1.setIsExpanded(true);

}

}

}

}

...

After deploying and running the project I see that the twisty icon before the driver "C" and the drive "D" and the direct child folder "Games" are expanded when I clicked the "EXPAND" ToolBarButton. The other folders under C or D are not expanded. Certainly there are somethings uncorrect but I do not know what.

Are there anyones who already have experience on this topic?

Please give me your advices!

Thank you in advance!

Bye

Thao

PS.

##############################################################

##

1. Filesystem resources for Web Dynpro Tutorial Tree

##

##############################################################

Drives = C;D

C = Documents;Program_Files;Temp;Windows;start.bat

Documents = Word;calc.xls;db.mdb

Word = first.doc;second.doc

Program_Files = Winzip;Accessories

Winzip = wz.com;wzinst.hlp;test.zip

Accessories = calculator.exe;notepad.exe;paint.exe

Windows = Java;Temporary_Internet_Files

Java = app.java;app.class

Temporary_Internet_Files = cookie1.txt;cookie2.txt;cookie3.txt;cookie4.txt

D = Games

Games = Soccer;Chess

Soccer = soccer.exe;field.lnd

Chess = chess.exe

[Former Member]

Hi,

If your node structure is,

Treenode

--treeText

--ChildNode(Recursive)

then if you want to expand all the Nodes and Subnodes, simply you can bind a boolean attribute to the expand property of the treeNodeType. and in the expand button action you can use,

wdContext.currentContextElement().set<Attribute>(true);

regards

karthik

[roberto_tagliento]

Hi

i did this for a my friend

www.awakening.it/TutWD_Tree.zip

look it

for EXPAND all TREE you must set to TRUE all "expand" attribute of recursive node.

There is a recursive method "ApriPercorso" (mean "OpenPath")

Now i will ADD a button that open all TREE.

Wait few minute

[roberto_tagliento]

Download now this:

<a href="http://www.awakening.it/TutWD_Tree.zip">TutWD_Tree</a>

I ADDED a recursive method "ExpandALL", where you pass also a boolean parameter, where choose to EXPAND or CLOSE ALL.

[Former Member]

hi,

See this thread:

Its for ABAP, but there is hardly any coding done, so the idea should work for Java

Regards,

Joris

[Former Member]

Here you go:

1. You need to create a new context attribute "size" of type integer for "treeNode" context.

2. Update addChildren() as follows:

********************************************************

private void addChildren(IPrivateTreeView.ITreeNodeElement parent) {

<b>int parentSize = 0;</b>

String resourceText =

resourceHandlerForTree.getString(parent.getText());

IPrivateTreeView.ITreeNodeElement child = null;

// if there is no entry in Filesystem.properties for key parent.getText() then the key is returned

if (resourceText.equals(parent.getText())) {

child = parent.nodeChildNode().createTreeNodeElement();

<b>parentSize = 1;</b>

child.setText("Empty Folder");

child.setHasChildren(false);

child.setIgnoreAction(true);

parent.nodeChildNode().addElement(child);

} else {

// populate all children

StringTokenizer strTokenizer =

new StringTokenizer(resourceText, ";");

String token = null;

while (strTokenizer.hasMoreTokens()) {

token = strTokenizer.nextToken();

child = parent.nodeChildNode().createTreeNodeElement();

<b>parentSize = parentSize + 1;</b>

if (token.indexOf(".") != -1) {

// token is a file

child.setHasChildren(false);

child.setIgnoreAction(false);

child.setIconSource("~sapicons/s_b_crea.gif");

} else {

// token is a folder

child.setHasChildren(true);

child.setIgnoreAction(true);

child.setIconSource("~sapicons/s_clofol.gif");

}

child.setText(token);

child.setIsExpanded(false);

parent.nodeChildNode().addElement(child);

}

}

<b>parent.setSize(parentSize);</b> }

******************************************************

3. Update onActionExpandAll() as:

*******************************************************

public void onActionExpandAll(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent )

{

//@@begin onActionExpandAll(ServerEvent)

IPrivateTreeView.ITreeNodeNode rootNode = wdContext.nodeTreeNode();

ArrayList result = new ArrayList();

IWDMessageManager messageMgr = wdThis.wdGetAPI().getComponent().getMessageManager();

try {

for (int i = 0; i<rootNode.size(); i++) {

getWholeTree((IPrivateTreeView.ITreeNodeElement)rootNode.getElementAt(i));

}

} catch (Exception e){

messageMgr.reportSuccess(e.getLocalizedMessage());

}

*******************************************************

4. Finally the recursive one:

public void getWholeTree( com.sap.tut.wd.tree.wdp.IPrivateTreeView.ITreeNodeElement element) {

addChildren(element);

element.setIsExpanded(true);

if(element.getHasChildren()){

for (int i=0; i< element.getSize(); i++) {

getWholeTree(element.getChildNodeElementAt(i));

}

}

}

Hope this will help.

cheers

~Qamar

[Former Member]

In your action you are not adding child nodes. You can do it as:

**********************************************************

for (int i = 0; i < rootNode.size(); i++){

IPrivateTreeView.ITreeNodeElement element = (IPrivateTreeView.ITreeNodeElement)rootNode.

getElementAt(i);

//Adding child nodes

<b>addChildren(element);</b>

element.setIsExpanded(true);

IPrivateTreeView.ITreeNodeNode subNode = element.nodeChildNode();

if (!subNode.isEmpty()){

for(int n = 0; n < subNode.size(); n++){

IPrivateTreeView.ITreeNodeElement element1 = (IPrivateTreeView.ITreeNodeElement)subNode.getElementAt(n);

//Adding child nodes

<b>addChildren(element1);</b>

//if (element1 != null){

element1.setIsExpanded(true);

//}

}

}

}

**********************************************************

Also even this will only expand the first level. In order to expand all you need some recurssive way to get child nodes, and expand them.

Note: The reason folder Games showed as expanded is because in tutorial they expand it in the wdDoInit() method.

[Former Member]

Hi Qamar,

thank you for your tip.

> The reason folder Games showed as expanded is because in tutorial they expand it in the wdDoInit() method.

- Yes, I know it. But I forgot to tell that I modify the code in the wdDoInit() method by setting

...

} else {

level1Node.setIsExpanded(false);

}

for the folder Games .

- After implementing your tip

<b>addChildren(element);</b>

it works well. I can expand all child nodes in the tree by static programming.

In order to expand the recursive tree dynamically I wrote the methode named getWholeTree(). The codes in this methode are as following:

<b>public void getWholeTree</b>( com.sap.tut.wd.tree.wdp.IPrivateTreeView.ITreeNodeNode node, java.util.ArrayList result ) {

for (int i = 0; i < node.size(); i++){

IPrivateTreeView.ITreeNodeElement element = (IPrivateTreeView.ITreeNodeElement)node.getElementAt(i);

// Adding child nodes

addChildren(element);

element.setIsExpanded(true);

IPrivateTreeView.ITreeNodeNode subNode = element.nodeChildNode();

if (subNode != null) {

if (!subNode.isEmpty()){

<b>getWholeTree(subNode, result);</b> } else {

result.add(element);

}

}

}

}

In the onActionExpandNodes I called the methode as following:

IPrivateTreeView.ITreeNodeNode subNode1 = wdContext.nodeTreeNode();

ArrayList result = new ArrayList();

IWDMessageManager messageMgr = wdThis.wdGetAPI().getComponent().getMessageManager();

try {

getWholeTree(subNode1, result);

} catch (Exception e){

messageMgr.reportSuccess(e.getLocalizedMessage());

}

After deploying it could not work. I know that it has the problem with the recursive methode. But why?

Can you help me? Or anyone has the experience on this?

Thank you.

Thao