beforeExpand

fires before expanding an item

void beforeExpand(string|number id,string dir){ ... };

Parameters

idstring|numberthe id of an item
dirstringoptional, the side the children will be shown in relation to the parent shape
("left" or "right" for type:"topic", otherwise - undefined)

Example

diagram.events.on("beforeExpand", function(id, dir) {
    console.log("Expanding " + diagram.data.getItem(id).text, dir);
    return true;
});
 
// For editor
editor.diagram.events.on("beforeExpand", function(id, dir) {
    console.log("Expanding " + editor.diagram.data.getItem(id).text, dir);
    return true;
});

Related samples

Details

Returning false from the handler will block the selection.

See also
Change log

The dir parameter was added in v3.1.

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