AngularJs D3 Force Directed Graph

My goal is to develop a force directed graph using AngularJS. Despite having already coded my application in AngularJS, I am struggling with integrating my JSON data into $scope.data and making the code more efficient.

var app = angular.module("chartApp", []);
app.directive('graph', function() {
    var graphLink = function(scope, element) {
        var width = 960,
            height = 500;

        var color = d3.scale.category20();

        var force = d3.layout.force()
            .charge(-120)
            .linkDistance(30)
            .size([width, height]);

        var svg = d3.select(element[0]).append("svg") // attach d3 to directive element
            .attr("width", width)
            .attr("height", height);

        d3.json("js/miserables", function(error, graph) {
            if (error) throw error;

            force
                .nodes(graph.nodes)
                .links(graph.links)
                .start();

            var link = svg.selectAll(".link") // there might be a more angular way to do this...
                .data(graph.links)
                .enter().append("line")
                .attr("class", "link")
                .style("stroke-width", function (d) {
                    return Math.sqrt(d.value);
                });

            var node = svg.selectAll(".node")
                .data(graph.nodes)
                .enter().append("circle")
                .attr("class", "node")
                .attr("r", 5)
                .style("fill", function (d) {
                    return color(d.group);
                })
                .call(force.drag);

            node.append("title")
                .text(function (d) {
                    return d.name;
                });

            force.on("tick", function () {
                link.attr("x1", function (d) {
                    return d.source.x;
                })
                    .attr("y1", function (d) {
                        return d.source.y;
                    })
                    .attr("x2", function (d) {
                        return d.target.x;
                    })
                    .attr("y2", function (d) {
                        return d.target.y;
                    });

                node.attr("cx", function (d) {
                    return d.x;
                })
                    .attr("cy", function (d) {
                        return d.y;
                    });
            });

            return {
                link: graphLink, // pass in your link function here
                scope: {
                    data: '=' // pass in your data as an attribute
                              // this makes this reusable, and you can redraw if the data changes
                }
            };
        })}});

JSON Data

{
// Insert your JSON data here
}

Answer №1

d3.json("myGraph_data.json", function(error, **data**) {
    if (error) throw error;
}

This snippet instructs the code to read the contents of the file myGraph_data.json, storing all the data in the variable called data.

Following this, you can implement the following:

$scope.data = null;
// It is important to initialize the variable before using it within a function!
var graphDataLink = function(scope, element) {
  d3.json("myGraph_data.json", function(error, **data**) {
        if (error) throw error;
        $scope.data = data;
        console.log($scope.data);
    }
}

Answer №2

Avoid loading your JSON data within the directive itself. The directive has a scoped attribute for data, so it is best to load the JSON in the application controller and then pass it to the directive's data property. By watching for changes in the data within the directive, you can dynamically update the graph whenever the data changes. This approach makes your graph directive reusable and allows for multiple graphs within your application.

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