The d3.js Time Scale Chart is facing issues when rendering with Array object values, unlike static values which render the chart perfectly

Generating an Array Dynamically with N objects from a JSON File

    var taskArray = [];


 d3.json("input.json", function(error, json) {
        if (error)
            return console.warn(error);

        for ( var i = 0; i < json.length; i++) {

                //console.log(json[i][0]);
                var tasks = [];
                var version = json[i][1];
                var phase = json[i][2];
                var part = version + "(" + phase + ")";
                var name = json[i][0];


                taskArray[i]={
                    "task" : part,
                    "type" : name,
                    "startTime" : json[i][3],
                    "endTime" : json[i][4]
                };

//      console.log(taskArray);
        }

        });

JSON file Format :

[["abc","abc_15.0.1","Intital_phase","Tue Jul 26 21:00:00 2016","Thu Jul 28 09:00:00 2016"]]

If I provide the Array values statically, it works:

  var taskArray = [

{
    task: "abc_15.0.1 (Intital_phase) ",
    type: "abc",
    startTime: "Mon Aug 01 06:00:00 2016", //year/month/day
    endTime: "Mon Aug 01 14:00:00 2016",
},
];

var dateFormat = d3.time.format("%a %b %e %H:%M:%S %Y");

var timeScale = d3.time.scale()
        .domain([d3.min(taskArray, function(d) {return dateFormat.parse(d.startTime);}),
                 d3.max(taskArray, function(d) {return dateFormat.parse(d.endTime);})])
        .range([0,w]);

Is the structure of the Array object not correct? Am I accessing the object values incorrectly? I am having difficulty identifying the issue.

Answer №1

The D3 date parser typically returns a string, but if you need to work with actual Date objects, you may want to consider the following approach:

var timeScale = d3.time.scale()
        .domain([d3.min(taskArray, function(d) {return new Date(d.startTime);}),
                 d3.max(taskArray, function(d) {return new Date(d.endTime);})])
        .range([0,w]);

UPDATE: The issue has been identified!

It seems that you are populating your taskArray within a d3.json() call and then attempting to use it immediately afterward. However, due to the asynchronous nature of d3.json(), this will not work as expected. This method returns quickly and runs in the background. To address this, you should provide a callback function as a second parameter to d3.json(). This callback function will be executed once the JSON data is loaded. In short, ensure that all code relying on the data is encapsulated within the callback function.

Answer №2

In my opinion, there are a few commas that can be eliminated. The comma following the endTime attribute is unnecessary, as well as the one right before the closing ].

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