transferring information to d3.js

I have a json object structured in the following way

{
   "tweet":[

     {"text": "hello world"},
     {"text": "hello world"}

   ]
}      

When I check the console output of "data" in my code below, it shows me an Object tweet: Array[131]. However, when I look at the value of "dots" where I'm binding my data, it displays 0: Array[1]. What could be causing this discrepancy?

d3.json("tweets.json", function(error, data){

  if (error) return console.warn(error);

  // Shows an `Object tweet: Array[131]`
  console.log(data);
  var dots = svg.selectAll("circle")
      .data(data)
      .enter()
      .append("circle");

  // Displays `0: Array[1]`
  console.log(dots);
}

Answer №1

To improve your JSON structure as per the suggestions mentioned, you can use a JSON validator such as to validate your JSON data. Additionally, ensure to make necessary adjustments in your Javascript code. Below are the updated versions of both your JSON and Javascript files.

Updated JSON file:

{
   "tweet":[
      {"text":"hello world"},
      {"text":"hello world"}
   ]
}

Updated Javascript file:

d3.json("tweetsTest.json", function (error, data) {

    if (error) return console.warn(error);

    // Displays data retrieved from JSON, which should be in the format `Object tweet: Array[131]`
    console.log(data);
    var dots = d3.select("svg")
        .selectAll("circle")
        .data(data.tweet)
        .enter()
        .append("circle")
        .attr("r", 5)
        .attr("cx", function (d, i) {
            return (i+1) * 20;
        })
        .attr("cy", function (d, i) {
            return 20;
        });

    // Confirms the creation of circles with the message `0: Array[1]`
    console.log(dots);
});

HTML setup:

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="initial-scale=1,maximum-scale=1"/>
    <script type="text/javascript" src="d3.js"></script>
    <script type="text/javascript" src="d3_stackoverflow34456619.js"></script>
</head>

<body>
    <svg style="width:500px;height:500px;border:1px lightgray solid;"></svg>
</body>
</html>

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