How can I plot data from an external JSON file to a chart.js graph?

Related searches

I would like to chart data from an external JSON file using chart.js. As an example, the json file here lists movies ("title") and ratings ("rt_score"). I'd like to be able to show each movie and its rating without including the static JSON in the .js file, but rather using the $.ajax call method to refer to the /films endpoint.

I'd like to have:

labels: labelsVariable data: dataVariable

Here is a fiddle with the setup so far with static data.

Here's my HTML:

<body>
  <canvas id="myChart" width="400" height="400"></canvas>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.8.0/Chart.min.js"> 
</script>
</body>

Here's the js that successfully generates a bar chart like I want, but with static data in "labels" and "data" instead of referencing the JSON file.

var ctx = document.getElementById('myChart');
var myChart = new Chart(ctx, {
type: 'bar',
data: {
    labels: ['Castle in the Sky', 'Grave of the Fireflies'],
    datasets: [{
        label: 'rating',
        data: [95, 97],
        borderWidth: 1
    }]
},
options: {
    scales: {
        yAxes: [{
            ticks: {
                beginAtZero: true
            }
        }]
    }
}
});

Instead of using the static data and labels, how can I reference the external JSON file using the $.ajax call method?

Based on what I've read, I may have to use "map" to break down the objects into arrays that contain labels and data?

Thank you in advance.

I think you are looking for Ajax request to fill your chart.

function getRandomIntInclusive(min, max) {
  min = Math.ceil(min);
  max = Math.floor(max);
  return Math.floor(Math.random() * (max - min + 1)) + min;
}
var ctx_live = document.getElementById("mycanvas");
var myChart = new Chart(ctx_live, {
  type: 'bar',
  data: {
    labels: [],
    datasets: [{
      data: [],
      borderWidth: 1,
      borderColor:'#00c0ef',
      label: 'liveCount',
    }]
  },
  options: {
    responsive: true,
    title: {
      display: true,
      text: "Chart.js - Dynamically Update Chart Via Ajax Requests",
    },
    legend: {
      display: false
    },
    scales: {
      yAxes: [{
        ticks: {
          beginAtZero: true,
        }
      }]
    }
  }
});
var postId = 1;
var getData = function() {
  $.ajax({
    url: 'https://jsonplaceholder.typicode.com/posts/' + postId + '/comments',
    success: function(data) {
      myChart.data.labels.push("Post " + postId++);
      myChart.data.datasets[0].data.push(getRandomIntInclusive(1, 25));

      // re-render the chart
      myChart.update();
    }
  });
};
setInterval(getData, 3000);

see live example here.

Plotting JSON Data with Chart.js, loading a javascript library for data visualization Charts.js --> <script var labels = []; //using jQuery ajax method get data from the external file. jQuery can also be used to load JSON data from a URL, but in most cases the raw JSON data will also need to be converted to a format that chart.js understands. The code below will use jQuery to load JSON data from a URL and separate it into two arrays (labels, data), and then insert that data into an object chart.js understands (tempData):

Load the json chart data dynamically and set it when you are creating the graph. There are many ways you can load the chart json data. However, I believe the JQuery getJSON function is more relevant to you.

$.getJSON( "chartdata/test.json", function( data ) {


 var myChart = new Chart(ctx, {
 type: 'bar',
 data: data,
 options: {
    scales: {
        yAxes: [{
            ticks: {
                beginAtZero: true
            }
        }]
    }
  }
 });


}

reading external json file with chartjs., Image for post. Chart.js is a popular open source library that helps us to plot data in web applications. All of the different types of charts can be seen here. As you can For that to work, we need to create our data.json file. Using JSON Data To Make Charts Using JSON Data to Make Charts Overview. JSON (JavaScript Object Notation) is a format that uses human-readable text to transmit data objects. By externalizing our chart data, we can reference our data from multiple locations and set caching options. Loading an External JSON Data File. Here are the contents of our

I figured it out. Here's what worked. I had to use .map to set up the data properly inside variables and then use those variables as data and labels.

function renderChart(data, labels) {
var ctx = document.getElementById("myChart").getContext('2d');
var myChart = new Chart(ctx, {
    type: 'bar',
    data: {
        labels: labels,
        datasets: [{
            label: 'This week',
            data: data,
        }]
    },
});
}
function getChartData() {
$("#loadingMessage").html('<img src="./giphy.gif" alt="" srcset="">');
$.ajax({
    url: "https://ghibliapi.herokuapp.com/films",
    success: function (result) {
        var data = result.map(x=>x.rt_score);
        var labels = result.map(x=>x.title);
        renderChart(data, labels);
        console.log(data);
    },
});

$("#renderBtn").click(
function () {
    getChartData();
});

How to use Chart.js, Then, we need to parse the table into JSON with vanilla JavaScript. This is what Chart.js will use to populate the charts and graphs. var table =� Here, I’ll show you how easily you can extract data from an external or local JSON file and use the data to create a simple Line Chart. There are two different methods for creating Line charts using Google Chart tools. You can use Google Core Charts method (the Classic mode or the old method) or the Material Line Charts method. I am sharing two separate examples here.

The Many Ways of Getting Data Into Charts, A tutorial on creating JavaScript Chart with JSON Data API & AJAX. You can also use Zooming / Panning when there is large amount of data. Here is a turtorial on creating Charts using JSON Data from an external source. CanvasJS Data Points and then push the same into an array for plotting and call chart.render(). Home › forums › Chart Support › Dynamic Chart Using Data From JSON File Tagged: chart , dynamic , JSON This topic has 3 replies, 2 voices, and was last updated 3 years, 12 months ago by Vishwas R .

JavaScript Charts from JSON Data API and AJAX, JavaScript Charts & Graphs from JSON Data Using AJAX CanvasJS Charts can also be plotted using JSON data API. Generally, it’s good idea to fetch data via AJAX request rather than embedding it in the web page. It is easy to parse JSON data and generate graph accordingly.

Updated January 17, 2020. Bar chart from external JSON file. Open

Comments
  • Thanks for responding. How do I get from the code you show above to being able to remove the string after "labels:" and after "data:"? I need to be able to place all of the movie titles into a variable and all of the rt_scores into a variable, right?
  • Please see the edited answer. The JSON you load dynamically should contain all what you had in the static version.