CODEWITHSUNDEEP
cytoscape.js
Konrad Höffner
Konrad Höffner

Reputation: 12207

How to create an empty collection in cytoscape.js?

I want users to hide nodes in a cytoscape.js graph but also have a reset function. How should I initialize hiddenNodes in the following code? I looked at http://js.cytoscape.org/#collection/building--filtering which tells me how to add and remove nodes from a collection but not how to create an empty one.

var hiddenNodes = ?

function hide(nodes)
{
 nodes.hide();
 hiddenNodes = hiddenNodes.union(nodes);
}

function reset()
{
 hiddenNodes.show();
}

P.S.: The hidden nodes are just a MWE, I know I could do this with selectors also.

P.P.S.: Are there alternative functions for union and difference that change the collection directly or are there only those who return new objects?

Upvotes: 1

Views: 977

Answers (1)

Tom Aerts
Tom Aerts

Reputation: 338

From the documentation for collection: cy.collection() - Get an empty collection

Upvotes: 2

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