Expanding/Collapsing all tree nodes
To expand all tree nodes:
var treeView = tree.treeBoxObject.view;
for (var i = 0; i < treeView.rowCount; i++) {
if (treeView.isContainer(i) && !treeView.isContainerOpen(i))
treeView.toggleOpenState(i);
}
To collapse all tree nodes just change the condition:
var treeView = tree.treeBoxObject.view;
for (var i = 0; i < treeView.rowCount; i++) {
if (treeView.isContainer(i) && treeView.isContainerOpen(i))
treeView.toggleOpenState(i);
}
Getting the text from the selected row
Assuming the given <tree>:
<tree id="my-tree" seltype="single" onselect="onTreeSelected()">
Use the following JavaScript:
function onTreeSelected(){
var tree = document.getElementById("my-tree");
var cellIndex = 0;
var cellText = tree.view.getCellText(tree.currentIndex, tree.columns.getColumnAt(cellIndex));
alert(cellText);
}
Getting the tree item from the focused row
Assuming <tree id="my-tree">, you can use the following to get the tree item:
var view = document.getElementById("my-tree").view;
var sel = view.selection.currentIndex; //returns -1 if the tree is not focused
var treeItem = view.getItemAtIndex(sel);
Note that the current index may be unselected (for example, a multi-select tree).
Getting the cell from a mouse click
Your first choice is likely to try <treecell onclick="yourfunc();"/> or something similar. But this will not work. You can't add event handlers to <treecell>. Instead, you can add the event handler to the <tree> element. You can then use the event and some utility methods to find the <treecell>. For example, assuming the given <tree>:
<tree id="my-tree" onclick="onTreeClicked(event)">
Use the following JavaScript:
function onTreeClicked(event){
var tree = document.getElementById("my-tree");
var tbo = tree.treeBoxObject;
// get the row, col and child element at the point
var row = { }, col = { }, child = { };
tbo.getCellAt(event.clientX, event.clientY, row, col, child);
var cellText = tree.view.getCellText(row.value, col.value);
alert(cellText);
}
Getting the selected indices of a multiselect tree
var start = {}, end = {}, numRanges = tree.view.selection.getRangeCount(), selectedIndices = [];
for (var t = 0; t < numRanges; t++){
tree.view.selection.getRangeAt(t, start, end);
for (var v = start.value; v <= end.value; v++)
selectedIndices.push(v);
}