Change nodes

GoJS
1

Hello,

I use GoJS and the TreeModel.

Each node in my tree has a property called “level” that simply is a number that shows its level in the tree. When I move a sub-graph the value of this “level” should get adjusted in all nodes of that sub-graph. How to do it?

I have this inside a mouseDrop-Function:

var diagram = node.diagram;
var selnode = diagram.selection.first();  // assume just one Node in selection
if (mayWorkFor(selnode, node)) {

      diagram.model.startTransaction("adjust level of all nodes under the Selected Node");
          var itr = selnode.findNodesOutOf();
          while (itr.next()) {
            var nodeN = itr.value;
            // here I need:     var nodeNadjustedLevel = find out the level-value of the nodeN
           diagram.model.setDataProperty(nodeN.data, 'level', nodeNadjustedLevel);
               }
        diagram.model.commitTransaction("adjust level of all nodes under the Selected Node");

}

selnode is the node that gets moved. If selnode has a sub-graph hanging under it then this sub-graph moves along with it --> all its nodes should get the adjustment of their “level” property.

2

By the way, you don’t need to conduct your own transaction in a mouseDrop event handler. GraphObject | GoJS API

3

I tried

var nodeNadjustedLevel = nodeN.findTreeLevel();

and it doesn’t work: Only the level-number of the selnode and of its direct child/children gets updated, not of all nodes of the subgraph that is hanging under the selnode. How would be possible to solve this problem?

4

You should be able to recurse through the subtree calling findNodesOutOf on each child, just as you’re already doing with the root.

5

@jhardy: Is there a similar example in the GoJs documentation?

6

I’m sure some of our samples use recursion, but I went ahead and made a simple example similar to your usage.

See http://codepen.io/jhardy/pen/RoLmOV?editors=1010.

Note the use of the recursive setSubtreeLevels function which visits the children of the parameter node, setting their levels.

7

Thanks A LOT xxx