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Zoomable network graph in AngularJS

Posted by: admin November 29, 2017 Leave a comment

Questions:

I would like to visualize a network graph in an AngularJS application. The nodes and edges are stored as a JSON object, and nodes will be added and modified later on (say once every 30 seconds). I want to use Angular data binding to automatically update the graph when the JSON object changes. The graph will have 10-1000 nodes. The nodes will be rectangular text nodes containing about a sentence each. I would like the graph to be zoom- and pan-able.

I know about the following options so far:

Are there other relevant libraries? What is the best library to use for this project, and how can I implement such a zoomable dynamic network graph given the library?

Answers:

I’ve been experimenting in VisJs in angular, and I’m really liking it so far. Their network is both pannable and zoomable, and you can select nodes. The documentation has been easy to follow and there are a lot of examples on their site.
Since vis’s networks can dynamically update, I found it easy to integrate it in my angular app. For example, I created this directive:

app.directive('visNetwork', function() {
    return {
        restrict: 'E',
        require: '^ngModel',
        scope: {
            ngModel: '=',
            onSelect: '&',
            options: '='
        },
        link: function($scope, $element, $attrs, ngModel) {
            var network = new vis.Network($element[0], $scope.ngModel, $scope.options || {});

            var onSelect = $scope.onSelect() || function(prop) {};
            network.on('select', function(properties) {
                onSelect(properties);
            });

        }

    }
});

Which I use in my html like so:

<vis-network ng-model="network_data" options="network_options" on-select="onNodeSelect" id="previewNetwork">
</vis-network>

Then in my controller I have the following:

    $scope.nodes = new vis.DataSet();
    $scope.edges = new vis.DataSet();
    $scope.network_data = {
        nodes: $scope.nodes,
        edges: $scope.edges
    };
    $scope.network_options = {
        hierarchicalLayout: {
            direction: "UD"
        }

    };

   $scope.onNodeSelect = function(properties) {
        var selected = $scope.task_nodes.get(properties.nodes[0]);
        console.log(selected);
    };

    $scope.nodes.add([
        {id: 1, label: 'Node 1'},
        {id: 2, label: 'Node 2'},
        {id: 3, label: 'Node 3'},
        {id: 4, label: 'Node 4'},
        {id: 5, label: 'Node 5'}]);

    $scope.edges.add([
        {id: 1, from: 1, to: 2},
        {id: 2, from: 3, to: 2}
    ]);

Questions:
Answers:

This should really be on Software Recommendation StackExchange but I can’t vote to close because of the bounty.

GoJS supports all of your requirements and works alongside Angular (simple demo here). (JSON for Model storage, data-binding, zoom and pan built in)

Questions:
Answers:

There is a good demo/example of a network map with sourcecode in D3: http://christophergandrud.github.io/d3Network/
The functionality is all there, and D3 seems to play nice with JSON. From my research, this is a strong choice for a visualization library. Many other libraries (graphite, etc.) also support the same functionality but are harder to implement and aren’t extremely active.

NVD3 is a variation of D3 designed for AngularJS that could also work. Implementing graphs and charts from within NVD3 is easier in AngularJS than D3 would be.