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How to Draw Bar Charts Using JavaScript and HTML5 Canvas
What You'll Be Creating In an earlier tutorial, we covered how to draw a pie chart or doughnut chart using HTML5 canvas. In this tutorial, I will show you how to use JavaScript and the HTML5 canvas to graphically display data by using bar charts.
What Is a Bar Chart?
Bar charts are very common tools used to represent numerical data. From financial reports to PowerPoint presentations to infographics, bar charts are used very often since they offer a view of numerical data that is very easy to understand.
Bar charts represent numerical data using bars, which are rectangles with either their widths or heights proportional to the numerical data that they represent.
There are many types of bar charts, for example:
- horizontal bar charts and vertical bar charts depending on the chart orientation
- stacked bar charts or classic bar charts for representing multiple series of data
- 2D or 3D bar charts
What Are the Components of a Bar Chart?
Let's take a look at the components that make up a bar chart, regardless of its type:
- The chart data: these are sets of numbers and associated categories which are represented by the chart.
- Name of the data series (1).
- The chart grid (2): gives a reference system so that the visual representation can be easily understood.
- The bars (3): color-filled rectangles with dimensions proportional to the data represented.
- Chart legend (4): shows the correspondence between the colors used and the data they represent.
Now that we know the components of a bar chart, let's see how we can write the JavaScript code to draw a chart like this.
Drawing the Bar Chart Using JavaScript
Setting Up the JS Project
To start drawing using JavaScript and the HTML5 canvas, we will need to set up our project like this:
- Create a folder to hold the project files; let's call this folder
bar-chart-tutorial. - Inside the project folder, create a file and call it index.html. This will contain our HTML code.
- Also inside the project folder, create a file and call it script.js. This will contain the JavaScript code for drawing the bar chart.
We'll keep things very simple and add the following code in index.html:
<html> <body> <canvas id="myCanvas"></canvas> <script type="text/javascript" src="script.js"></script> </body> </html>We have the
<canvas>element with the IDmyCanvasso that we can reference it in our JS code. We then load the JS code via the<script>tag.Add the following code in the script.js file:
var myCanvas = document.getElementById("myCanvas"); myCanvas.width = 500; myCanvas.height = 500; var ctx = myCanvas.getContext("2d");This gets a reference to the canvas element and then sets the width and height to
300px. To draw on the canvas, we only need a reference to its 2D context, which contains all the drawing methods.Adding a Few Helper Functions
Drawing the bar chart only requires knowing how to draw two elements:
- drawing a line: for drawing the grid lines
- drawing a color-filled rectangle: for drawing the bars of the chart
Let's create the helper JS functions for these two elements. We will add the functions in our script.js file.
function drawLine(ctx, startX, startY, endX, endY,color){ ctx.save(); ctx.strokeStyle = color; ctx.beginPath(); ctx.moveTo(startX,startY); ctx.lineTo(endX,endY); ctx.stroke(); ctx.restore(); }The
drawLinefunction takes six parameters:-
ctx: reference to the drawing context -
startX: the X coordinate of the line starting point -
startY: the Y coordinate of the line starting point -
endX: the X coordinate of the line end point -
endY: the Y coordinate of the line end point -
color: the color of the line
We are modifying the color settings for the
strokeStyle. This determines the color used to draw the line. We usectx.save()andctx.restore()so that we don't affect the colors used outside this function.We draw the line by calling
beginPath(). This informs the drawing context that we are starting to draw something new on the canvas. We usemoveTo()to set the starting point, calllineTo()to indicate the end point, and then do the actual drawing by callingstroke().Another helper function that we need is a function to draw a bar—which is a color-filled rectangle. Let's add it to script.js:
function drawBar(ctx, upperLeftCornerX, upperLeftCornerY, width, height,color){ ctx.save(); ctx.fillStyle=color; ctx.fillRect(upperLeftCornerX,upperLeftCornerY,width,height); ctx.restore(); }The
drawBarfunction takes six parameters:-
ctx: reference to the drawing context -
upperLeftCornerX: the X coordinate of the bar's upper left corner -
upperLeftCornerY: the X coordinate of the bar's upper left corner -
width: the width of the bar -
height: the height of the bar -
color: the color of the bar
The Bar Chart Data Model
Now that we have the helper functions in place, let's move on to the chart's data model. All types of chart, including bar charts, have a data model behind them. The data model is a structured set of numerical data. For this tutorial, we will use a data series of categories and their associated numerical values representing the number of vinyl records in my collection of records grouped by music genre:
- Classical music: 16
- Alternative rock: 12
- Pop: 18
- Jazz: 32
We can represent this in JavaScript in the form of an object. We will pass this data to our
BarChartobject along with other information. Let's add it to our script.js file:{ "Classical Music": 16, "Alternative Rock": 12, "Pop": 18, "Jazz": 32, }Implementing the BarChart Class
Our
BarChartclass will have a variety of methods to help split the code into separate related parts. Different components of the bar chart will be drawn by different methods.Implementing the Bar Chart Component
Let's implement the class and methods that will do the actual drawing of our bar chart. We will do this by adding the following JavaScript code to our script.js file:
class BarChart { constructor(options) { this.options = options; this.canvas = options.canvas; this.ctx = this.canvas.getContext("2d"); this.colors = options.colors; this.titleOptions = options.titleOptions; this.maxValue = Math.max(...Object.values(this.options.data)); } drawGridLines() { var canvasActualHeight = this.canvas.height - this.options.padding * 2; var canvasActualWidth = this.canvas.width - this.options.padding * 2; var gridValue = 0; while (gridValue <= this.maxValue) { var gridY = canvasActualHeight * (1 - gridValue / this.maxValue) + this.options.padding; drawLine( this.ctx, 0, gridY, this.canvas.width, gridY, this.options.gridColor ); drawLine( this.ctx, 15, this.options.padding/2, 15, gridY + this.options.padding/2, this.options.gridColor ); // Writing grid markers this.ctx.save(); this.ctx.fillStyle = this.options.gridColor; this.ctx.textBaseline = "bottom"; this.ctx.font = "bold 10px Arial"; this.ctx.fillText(gridValue, 0, gridY - 2); this.ctx.restore(); gridValue += this.options.gridScale; } } drawBars() { var canvasActualHeight = this.canvas.height - this.options.padding * 2; var canvasActualWidth = this.canvas.width - this.options.padding * 2; var barIndex = 0; var numberOfBars = Object.keys(this.options.data).length; var barSize = canvasActualWidth / numberOfBars; var values = Object.values(this.options.data); for (let val of values) { var barHeight = Math.round((canvasActualHeight * val) / this.maxValue); console.log(barHeight); drawBar( this.ctx, this.options.padding + barIndex * barSize, this.canvas.height - barHeight - this.options.padding, barSize, barHeight, this.colors[barIndex % this.colors.length] ); barIndex++; } } draw() { this.drawGridLines(); this.drawBars(); } }The class starts defining the constructor method to do some basic initialization by storing the
optionspassed as parameters in different properties. It stores thecanvasreference and creates a drawing context also stored as a class member. Then it stores thecolorsarray passed as options. It also extracts the maximum value of the keys from our data object and stores it in themaxValueproperty. We need this number because we will need to scale all the bars according to this value and according to the size of the canvas. Otherwise, our bars might go outside the display area, and we don't want that.Now, we will implement the
drawGridLines()method. This will draw the grid lines and the grid markers.The
canvasActualHeightandcanvasActualWidthvariables store the height and width of the canvas adjusted using the value of the padding passed viaoptions. Thepaddingvariable indicates the number of pixels between the edge of the canvas and the chart inside.We then draw the grid lines of the chart. The
options.gridStepproperty sets the step used for drawing the lines. So anoptions.gridStepof 10 will mean drawing grid lines every 10 units.To draw the grid lines, we use the helper function
drawLine(); as for the color of the grid lines, we take it from theoptions.gridColorvariable. Please note that the canvas coordinates start from0,0in the top left corner and increase towards the right and bottom, while our grid values increase in value from the bottom towards the top. That is why we used1 - gridValue/maxValuein the formula calculating thegridYvalue.For every grid line, we also draw the value of the grid line 2 pixels above the grid line (that's why we have
gridY - 2for the Y coordinates of the text).Next, we draw the bars by using the
drawBars()method. The math for calculating the height and width of each bar is pretty straightforward; it takes into account the padding and the value and color for each category in the chart's data model.Using the Bar Chart Component
Let's now see how to use the
BarChartclass implemented above. We need to instantiate the class and call thedraw()method. Add the following code to the script.js file:var myBarchart = new BarChart({ canvas: myCanvas, padding: 40, gridScale: 5, gridColor: "black", data: { "Classical Music": 16, "Alternative Rock": 12, "Pop": 18, "Jazz": 32, }, colors: ["#a55ca5", "#67b6c7", "#bccd7a", "#eb9743"], }); myBarchart.draw();The code creates a new instance of the
BarChartclass with the required options. We will write the methods that use thetitleOptionsobject in the next section of the tutorial. Loading the index.html in a browser should produce a result like this:
Adding the Data Series Name and Chart Legend
To add the data series name below the chart, we need to add the following method to our
BarChartclass:drawLabel() { this.ctx.save(); this.ctx.textBaseline = "bottom"; this.ctx.textAlign = this.titleOptions.align; this.ctx.fillStyle = this.titleOptions.fill; this.ctx.font = `${this.titleOptions.font.weight} ${this.titleOptions.font.size} ${this.titleOptions.font.family}`; let xPos = this.canvas.width / 2; if (this.titleOptions.align == "left") { xPos = 10; } if (this.titleOptions.align == "right") { xPos = this.canvas.width - 10; } this.ctx.fillText(this.options.seriesName, xPos, this.canvas.height); this.ctx.restore(); }We accept a bunch of font properties inside our
titleOptionsobject to set things like the font size, font family, and font weight. We also accept a string value to determine the alignment of the chart title. We use this value both to control the alignment of the title and to determine the position of the new string besides its alignment.Also update the
draw()method of the class to add a call todrawLabel().draw() { this.drawGridLines(); this.drawBars(); this.drawLabel(); }We also need to change the way we instantiate the
Barchartclass like this:var myBarchart = new Barchart( { canvas:myCanvas, seriesName:"Vinyl records", padding:20, gridScale:5, gridColor:"#eeeeee", data: { "Classical Music": 16, "Alternative Rock": 12, "Pop": 18, "Jazz": 32, }, colors:["#a55ca5","#67b6c7", "#bccd7a","#eb9743"], titleOptions: { align: "center", fill: "black", font: { weight: "bold", size: "18px", family: "Lato" } } } ); myBarchart.draw();And here is how the result looks:
To add the legend, we first need to modify
index.htmlto look like this:<html> <body> <canvas id="myCanvas" style="background: white;"></canvas> <legend for="myCanvas"></legend> <script type="text/javascript" src="script.js"></script> </body> </html>The
legendtag will be used as a placeholder for the chart's legend. Theforattribute links the legend to the canvas holding the chart. We now need to add the code that creates the legend. We will do this in theindex.jsfile after the code that draws the data series name. The code identifies thelegendtag corresponding to the chart, and it will add the list of categories from the chart's data model together with the corresponding color. The resulting index.js file will look like this:var myCanvas = document.getElementById("myCanvas"); myCanvas.width = 500; myCanvas.height = 500; var ctx = myCanvas.getContext("2d"); function drawLine(ctx, startX, startY, endX, endY, color) { ctx.save(); ctx.strokeStyle = color; ctx.beginPath(); ctx.moveTo(startX, startY); ctx.lineTo(endX, endY); ctx.stroke(); ctx.restore(); } function drawBar( ctx, upperLeftCornerX, upperLeftCornerY, width, height, color ) { ctx.save(); ctx.fillStyle = color; ctx.fillRect(upperLeftCornerX, upperLeftCornerY, width, height); ctx.restore(); } class BarChart { constructor(options) { this.options = options; this.canvas = options.canvas; this.ctx = this.canvas.getContext("2d"); this.colors = options.colors; this.titleOptions = options.titleOptions; this.maxValue = Math.max(...Object.values(this.options.data)); } drawGridLines() { var canvasActualHeight = this.canvas.height - this.options.padding * 2; var canvasActualWidth = this.canvas.width - this.options.padding * 2; var gridValue = 0; while (gridValue <= this.maxValue) { var gridY = canvasActualHeight * (1 - gridValue / this.maxValue) + this.options.padding; drawLine( this.ctx, 0, gridY, this.canvas.width, gridY, this.options.gridColor ); drawLine( this.ctx, 15, this.options.padding / 2, 15, gridY + this.options.padding / 2, this.options.gridColor ); // Writing grid markers this.ctx.save(); this.ctx.fillStyle = this.options.gridColor; this.ctx.textBaseline = "bottom"; this.ctx.font = "bold 10px Arial"; this.ctx.fillText(gridValue, 0, gridY - 2); this.ctx.restore(); gridValue += this.options.gridStep; } } drawBars() { var canvasActualHeight = this.canvas.height - this.options.padding * 2; var canvasActualWidth = this.canvas.width - this.options.padding * 2; var barIndex = 0; var numberOfBars = Object.keys(this.options.data).length; var barSize = canvasActualWidth / numberOfBars; var values = Object.values(this.options.data); for (let val of values) { var barHeight = Math.round((canvasActualHeight * val) / this.maxValue); console.log(barHeight); drawBar( this.ctx, this.options.padding + barIndex * barSize, this.canvas.height - barHeight - this.options.padding, barSize, barHeight, this.colors[barIndex % this.colors.length] ); barIndex++; } } drawLabel() { this.ctx.save(); this.ctx.textBaseline = "bottom"; this.ctx.textAlign = this.titleOptions.align; this.ctx.fillStyle = this.titleOptions.fill; this.ctx.font = `${this.titleOptions.font.weight} ${this.titleOptions.font.size} ${this.titleOptions.font.family}`; let xPos = this.canvas.width / 2; if (this.titleOptions.align == "left") { xPos = 10; } if (this.titleOptions.align == "right") { xPos = this.canvas.width - 10; } this.ctx.fillText(this.options.seriesName, xPos, this.canvas.height); this.ctx.restore(); } drawLegend() { let pIndex = 0; let legend = document.querySelector("legend[for='myCanvas']"); let ul = document.createElement("ul"); legend.append(ul); for (let ctg of Object.keys(this.options.data)) { let li = document.createElement("li"); li.style.listStyle = "none"; li.style.borderLeft = "20px solid " + this.colors[pIndex % this.colors.length]; li.style.padding = "5px"; li.textContent = ctg; ul.append(li); pIndex++; } } draw() { this.drawGridLines(); this.drawBars(); this.drawLabel(); this.drawLegend(); } } var myBarchart = new BarChart({ canvas: myCanvas, seriesName: "Vinyl records", padding: 40, gridStep: 5, gridColor: "black", data: { "Classical Music": 16, "Alternative Rock": 12, Pop: 18, Jazz: 32 }, colors: ["#a55ca5", "#67b6c7", "#bccd7a", "#eb9743"], titleOptions: { align: "center", fill: "black", font: { weight: "bold", size: "18px", family: "Lato" } } }); myBarchart.draw();Which will produce a final result looking like this:
Try passing different options to the chart to see how it affects the final result. As an exercise, can you write to code make those grid lines multi-colored?
Congratulations
We have seen that drawing charts using the HTML5 canvas is actually not that hard. It only requires a bit of math and a bit of JavaScript knowledge. You now have everything you need for drawing your own bar charts.
This post has been updated with contributions from Nitish Kumar. Nitish is a web developer with experience in creating eCommerce websites on various platforms. He spends his free time working on personal projects that make his everyday life easier or taking long evening walks with friends.
martijn broeders
founder/ strategic creative at shineyrock web design & consultancy
e-mail: .(JavaScript must be enabled to view this email address)
phone: 434 210 0245
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Performant Animations Using KUTE.js: Part 4, Animating Text
/ -11 -
Performant Animations Using KUTE.js: Part 3, Animating SVG
/ -9 -
New Course: Code a Quiz App With Vue.js
/ -2 -
Performant Animations Using KUTE.js: Part 2, Animating CSS Properties
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/ 8
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Performant Animations Using KUTE.js: Part 1, Getting Started
/ 1 -
10 Best Responsive HTML5 Sliders for Images and Text (Plus 3 Free Options)
/ -3 -
Single-Page Applications With ngRoute and ngAnimate in AngularJS
/ -14 -
Deferring Tasks in Laravel Using Queues
/ -3 -
/ 2
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Site Authentication in Node.js: User Signup and Login
/ 10 -
Working With Tables in React, Part Two
/ -17 -
Working With Tables in React, Part One
/ 1 -
How to Set Up a Scalable, E-Commerce-Ready WordPress Site Using ClusterCS
/ -2 -
New Course on WordPress Conditional Tags
/ 2 -
October, 2017
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/ -11
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Building With Vue.js 2 and Firebase
6 / 11 -
/ -8
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/ 1
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Best Unique Bootstrap JavaScript Plugins
/ -6 -
/ -1
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Essential JavaScript Libraries and Frameworks You Should Know About
/ 5 -
/ 3
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Vue.js Crash Course: Create a Simple Blog Using Vue.js
/ -14 -
Build a React App With a Laravel RESTful Back End: Part 1, Laravel 5.5 API
/ 2 -
API Authentication With Node.js
/ -4 -
Beginner’s Guide to Angular: HTTP
/ 8 -
Beginner’s Guide to Angular: Routing
/ -4 -
Beginners Guide to Angular: Routing
/ -4 -
Beginner’s Guide to Angular: Services
/ 2 -
Beginner’s Guide to Angular: Components
/ 1 -
September, 2017
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How to Create a Custom Authentication Guard in Laravel
/ 5 -
Learn Computer Science With JavaScript: Part 3, Loops
/ -3 -
Build Web Applications Using Node.js
/ 1 -
Learn Computer Science With JavaScript: Part 4, Functions
/ 6 -
Learn Computer Science With JavaScript: Part 2, Conditionals
/ 13 -
Learn Computer Science With JavaScript: Part 1, The Basics
/ -1 -
Create Interactive Charts Using Plotly.js, Part 5: Pie and Gauge Charts
/ -8 -
Create Interactive Charts Using Plotly.js, Part 4: Bubble and Dot Charts
/ 16 -
Create Interactive Charts Using Plotly.js, Part 3: Bar Charts
/ -11 -
Awesome JavaScript Libraries and Frameworks You Should Know About
/ -7 -
Create Interactive Charts Using Plotly.js, Part 2: Line Charts
/ -9 -
Bulk Import a CSV File Into MongoDB Using Mongoose With Node.js
/ -6 -
Build a To-Do API With Node, Express, and MongoDB
/ -8 -
Getting Started With End-to-End Testing in Angular Using Protractor
/ 10 -
TypeScript for Beginners, Part 4: Classes
/ -15 -
Object-Oriented Programming With JavaScript
/ 4 -
10 Best Affiliate WooCommerce Plugins Compared
/ 6 -
Stateful vs. Stateless Functional Components in React
/ 8 -
Make Your JavaScript Code Robust With Flow
/ -2 -
Build a To-Do API With Node and Restify
/ 7 -
Testing Components in Angular Using Jasmine: Part 2, Services
/ 3 -
Testing Components in Angular Using Jasmine: Part 1
/ -1 -
Creating a Blogging App Using React, Part 6: Tags
/ -10 -
August, 2017
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React Crash Course for Beginners, Part 3
/ 4 -
React Crash Course for Beginners, Part 2
/ 5 -
React Crash Course for Beginners, Part 1
/ 3 -
Set Up a React Environment, Part 4
1 / 9 -
Set Up a React Environment, Part 3
/ -9 -
New Course: Get Started With Phoenix
/ -7 -
Set Up a React Environment, Part 2
/ 2 -
Command Line Basics and Useful Tricks With the Terminal
/ 9 -
How to Create a Real-Time Feed Using Phoenix and React
/ -2 -
Build a React App With a Laravel Back End: Part 2, React
/ 2 -
Build a React App With a Laravel RESTful Back End: Part 1, Laravel 9 API
/ -4 -
Creating a Blogging App Using React, Part 5: Profile Page
/ -1 -
Pagination in CodeIgniter: The Complete Guide
/ 24 -
JavaScript-Based Animations Using Anime.js, Part 4: Callbacks, Easings, and SVG
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JavaScript-Based Animations Using Anime.js, Part 3: Values, Timeline, and Playback
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Learn to Code With JavaScript: Part 1, The Basics
/ 4 -
July, 2017
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10 Elegant CSS Pricing Tables for Your Latest Web Project
/ -10 -
Getting Started With the Flux Architecture in React
/ -2 -
Getting Started With Matter.js: The Composites and Composite Modules
/ 1 -
Getting Started With Matter.js: The Engine and World Modules
/ 13 -
10 More Popular HTML5 Projects for You to Use and Study
/ -19 -
Understand the Basics of Laravel Middleware
/ -1 -
Iterating Fast With Django & Heroku
/ 9 -
Creating a Blogging App Using React, Part 4: Update & Delete Posts
/ 5 -
Creating a jQuery Plugin for Long Shadow Design
/ -12 -
How to Register & Use Laravel Service Providers
2 / -13 -
Unit Testing in React: Shallow vs. Static Testing
/ 4 -
Creating a Blogging App Using React, Part 3: Add & Display Post
/ 13 -
June, 2017
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Creating a Blogging App Using React, Part 2: User Sign-Up
20 / -3 -
Creating a Blogging App Using React, Part 1: User Sign-In
/ 7 -
9 More Popular HTML5 Projects for You to Use and Study
/ 15 -
Creating a Grocery List Manager Using Angular, Part 2: Managing Items
/ 8 -
9 Elegant CSS Pricing Tables for Your Latest Web Project
/ -2 -
Dynamic Page Templates in WordPress, Part 3
/ -4 -
Angular vs. React: 7 Key Features Compared
/ 6 -
Creating a Grocery List Manager Using Angular, Part 1: Add & Display Items
/ 2 -
New eBooks Available for Subscribers in June 2017
/ 7 -
Create Interactive Charts Using Plotly.js, Part 1: Getting Started
/ 10 -
The 5 Best IDEs for WordPress Development (And Why)
/ -2 -
33 Popular WordPress User Interface Elements
/ 2 -
New Course: How to Hack Your Own App
/ -11 -
How to Install Yii on Windows or a Mac
/ 3 -
What Is a JavaScript Operator?
/ -7 -
How to Register and Use Laravel Service Providers
/ 9
waly Good blog post. I absolutely love this…