Is there a way to integrate a d3 force directive graph for use with AngularJS?

I have successfully created a D3 force directive graph using plain JavaScript.

If you want to see the working D3 graph, click on this link.

Now my goal is to fetch data from a service and display the graph in AngularJS. I am wondering how I can turn this into a directive. Any examples or guidance would be highly appreciated!

To retrieve the data from the service, I have set up a controller with the following code:

 $scope.buildchart = function(widget) {
        var w2 = new Worker("scripts/webworkers/bigQueryWorker.js");           
        w2.postMessage($scope.selectedClass + "," 
          + $rootScope.hierarchystring.toString() 
          + "," + "Hierarchy" + "," + Digin_Engine_API);

        w2.addEventListener('message', function(event) {
            hierarchyRetrieved(event);
        });

        function hierarchyRetrieved(event) {
            var obj = JSON.parse(event.data);
            console.log("Hierarchy data is");
            console.log(JSON.stringify(obj));

        };
    };

I'm trying to figure out if there's a way for me to access this data within the mentioned function.

function loadImage() {}

Answer №1

It seems like the code provided may be a bit overwhelming to convert into Angular, but I'll do my best to explain with some snippets :)

To start, you'll need to create a DOM element where your Angular directive will inject the d3 chart.

This can be achieved by:

<svg linear-chart></svg>

In this case, 'linear-chart' will trigger the directive. Now let's define the directive:

app.directive('linearChart', function () {
    return {
        restrict: 'EA',

        link: function (scope, elem, attrs) {
        //Include all the necessary code for creating the force layout here
}});

The next challenge involves fetching data asynchronously using a web worker.

$scope.buildchart = function(widget) {
        var w2 = new Worker("scripts/webworkers/bigQueryWorker.js");           
        w2.postMessage($scope.selectedClass + "," + $rootScope.hierarchystring.toString() + "," + "Hierarchy" + "," + Digin_Engine_API);
        w2.addEventListener('message', function(event) {
            hierarchyRetrieved(event);
        });

        function hierarchyRetrieved(event) {
            var obj = JSON.parse(event.data);
            $scope.data = obj;//Setting the retrieved data to the scope object.

        };
    };

Once the asynchronous task is completed, the data in the scope will be updated. To accommodate this change in data, we need to set up a watch function that triggers the link function whenever $scope.data changes.

Something along these lines:

app.directive('linearChart', function () {
    return {
        restrict: 'EA',

        link: function (scope, elem, attrs) {
            //This will monitor changes in scope data
            scope.$watch(
                "data",function(){/*Include your d3 code for creating the force layout here, which will execute when scope.data changes :)
*/})...

For reference, here is a small fiddle demonstrating the concept.

Note: In this example, I've simulated the web worker functionality with a button click within the loadData function.

I hope this explanation proves helpful! :)

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