sophie-huang / book_appendix_z_hands-on-data-visualization-chartjs-bar

精通資料視覺化 --> Bar chart with Chart.js (template)

Bar or Column Chart with One or More Data Series in Chart.js

Demo

https://handsondataviz.github.io/chartjs-bar/

Sample data by CT Department of Education.

Create your own

See chapter 10: Chart.js and Highcharts templates in Hands-On Data Visualization by Jack Dougherty and Ilya Ilyankou

Prepare your data in CSV format and upload into a data.csv file. Place labels that will appear along the axis in the first column, and each data series in its own column. Your CSV must contain at least two columns (labels and one data series). You can add as many data series columns as you wish.

district	nonlearner	learner
Hartford	15656	4111
New Haven	17730	3534

In script.js, customize the values of variables shown in the code snippet below:

  var TITLE = 'English Learners by Select School Districts in CT, 2018-19';

  // `false` for vertical column chart, `true` for horizontal bar chart
  var HORIZONTAL = false;

	// `false` for individual bars, `true` for stacked bars
  var STACKED = false;  
  
  // Which column defines 'bucket' names?
  var LABELS = 'district';  

  // For each column representing a data series, define its name and color
  var SERIES = [  
    {
      column: 'nonlearner',
      name: 'Non-Learners',
      color: 'grey'
    },
    {
      column: 'learner',
      name: 'Learners',
      color: 'blue'
    }
  ];

  // x-axis label and label in tooltip
  var X_AXIS = 'School Districts';

  // y-axis label, label in tooltip
  var Y_AXIS = 'Number of Enrolled Students';

  // `true` to show the grid, `false` to hide
  var SHOW_GRID = true; 

  // `true` to show the legend, `false` to hide
  var SHOW_LEGEND = true; 

For more customization, see Chart.js documentation.

Why am I not seeing my chart when I open index.html in the browser?

This error is known as cross-origin request error. When you double-click the file to open locally in your browser, you will see the URL in the address bar starting with file:, and all attempts to read a local CSV file, even though it is located in the same folder, will fail.

Here are a few ideas how to go around it:

• Find out how to disable same-origin policy in your browser (to start with, see this blog post or this StackOverflow thread).
• Install a program that will emulate a local server on your device, such as live-server(https://www.npmjs.com/package/live-server).
• Move your CSV files to a remote location on the web (such as GitHub Gist, AWS S3, or a Wordpress site), and in script.js, change $.get('./data.csv', function(csvString) { to $.get('https://wherever.your/file/is/data.csv', function(csvString) {.
• Do all the development (file modifications) within GitHub without downloading this repository, using either GitHub's web interface, or GitHub Desktop application.

See other chart templates

• Chart.js Bar Chart with Error Bars: https://github.com/HandsOnDataViz/chartjs-error-bars
• Chart.js Line Chart: https://github.com/HandsOnDataViz/chartjs-line
• Chart.js Scatter Chart: https://github.com/HandsOnDataViz/chartjs-scatter
• Chart.js Bubble Chart: https://github.com/HandsOnDataViz/chartjs-bubble
• Highcharts Annotated Line Chart: https://github.com/HandsOnDataViz/highcharts-line-annotated