Example of Popoto.js application showing use of popoto.graph.Events.GRAPH_NODE_RELATION_ADD event fired when a new relation is added.
In this customization example when a relation is added all the other one on the same node are removed.
// Add a listener on new relation added
popoto.graph.on(popoto.graph.Events.GRAPH_NODE_RELATION_ADD, function (relations) {
var newRelation = relations[0];
// Collapse all expanded choose nodes first to avoid having value node in selection.
popoto.graph.node.collapseAllNode();
var linksToRemove = popoto.dataModel.links.filter(function (link) {
// All other links starting from same source node except new one.
return link !== newRelation && link.source === newRelation.source;
});
linksToRemove.forEach(function (link) {
var willChangeResults = popoto.graph.node.removeNode(link.target);
popoto.result.hasChanged = popoto.result.hasChanged || willChangeResults;
});
popoto.update();
});