Client Side Chart Widget in HTML 5: Part 8 (Pie Chart With Custom ToolTip)

In this article we will learn about the client side chart widget in HTML 5.

Introduction

I hope you have read my first two articles in this series that explains the loading of Bar Charts, Pie Charts, Line Charts, Doughnut Charts, Polar Area Charts, Radar Charts and Line Chart with custom tooltip. Please see the following links.

Now we will explain a client Pie Chart widget with custom tooltip in HTML5.

Background

Please download the necessary files here.

Using the code

A simple HTML
  1. <!DOCTYPE html>     
  2.    <html xmlns="http://www.w3.org/1999/xhtml">     
  3.       <head>     
  4.          <title> Pie Chart widget with custom tooltip Using Chart.js</title>     
  5.       </head>     
  6.       <body></body>     
  7.    </html>     

Included JavaScript file

  1. <script src="Chart.js"></script>     
  2. <script src="http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>    

Include UI Elements

  1. <div id="canvas-holder">  
  2.     <canvas id="chart-area1" width="50" height="50" />  
  3. </div>  
  4. <div id="canvas-holder">  
  5.     <canvas id="chart-area2" width="300" height="300" />  
  6. </div>  
  7. <div id="chartjs-tooltip"></div>  

Call the Chart Function

  1. window.onload = function () {  
  2.     var ctx1 = document.getElementById("chart-area1").getContext("2d");  
  3.     window.myPie = new Chart(ctx1).Pie(pieData);  
  4.   
  5.     var ctx2 = document.getElementById("chart-area2").getContext("2d");  
  6.     window.myPie = new Chart(ctx2).Pie(pieData);  
  7. ;    

Here we are loading the chart in the chart-area1 and chart-area2.

As you can see in the preceding code, pieData is the data we will load into the chart.

  1. var pieData = [{  
  2.            value: 300,  
  3.            color: "#F7464A",  
  4.            highlight: "#FF5A5E",  
  5.            label: "Monday"  
  6.        }, {  
  7.            value: 50,  
  8.            color: "#46BFBD",  
  9.            highlight: "#5AD3D1",  
  10.            label: "Tuesday"  
  11.        }, {  
  12.            value: 100,  
  13.            color: "#FDB45C",  
  14.            highlight: "#FFC870",  
  15.            label: "Wednesday"  
  16.        }, {  
  17.            value: 40,  
  18.            color: "#949FB1",  
  19.            highlight: "#A8B3C5",  
  20.            label: "Thursday"  
  21.        }, {  
  22.            value: 120,  
  23.            color: "#4D5360",  
  24.            highlight: "#616774",  
  25.            label: "Friday"  
  26.        }];  
 Properties
  • Value
  • Color
  • Highlight
  • Label
Here you can change the properties as you want.

Now add the following style.
  1. <style>  
  2.         #canvas-holder {  
  3.             width: 100%;  
  4.             margin-top: 50px;  
  5.             text-align: center;  
  6.         }  
  7.  
  8.         #chartjs-tooltip {  
  9.             opacity: 1;  
  10.             position: absolute;  
  11.             background: rgba(0, 0, 0, .7);  
  12.             color: white;  
  13.             padding: 3px;  
  14.             border-radius: 3px;  
  15.             -webkit-transition: all .1s ease;  
  16.             transition: all .1s ease;  
  17.             pointer-events: none;  
  18.             -webkit-transform: translate(-50%, 0);  
  19.             transform: translate(-50%, 0);  
  20.         }  
  21.  
  22.             #chartjs-tooltip.below {  
  23.                 -webkit-transform: translate(-50%, 0);  
  24.                 transform: translate(-50%, 0);  
  25.             }  
  26.  
  27.                 #chartjs-tooltip.below:before {  
  28.                     border: solid;  
  29.                     border-color: #111 transparent;  
  30.                     border-color: rgba(0, 0, 0, .8) transparent;  
  31.                     border-width: 0 8px 8px 8px;  
  32.                     bottom: 1em;  
  33.                     content: "";  
  34.                     display: block;  
  35.                     left: 50%;  
  36.                     position: absolute;  
  37.                     z-index: 99;  
  38.                     -webkit-transform: translate(-50%, -100%);  
  39.                     transform: translate(-50%, -100%);  
  40.                 }  
  41.  
  42.             #chartjs-tooltip.above {  
  43.                 -webkit-transform: translate(-50%, -100%);  
  44.                 transform: translate(-50%, -100%);  
  45.             }  
  46.  
  47.                 #chartjs-tooltip.above:before {  
  48.                     border: solid;  
  49.                     border-color: #111 transparent;  
  50.                     border-color: rgba(0, 0, 0, .8) transparent;  
  51.                     border-width: 8px 8px 0 8px;  
  52.                     bottom: 1em;  
  53.                     content: "";  
  54.                     display: block;  
  55.                     left: 50%;  
  56.                     top: 100%;  
  57.                     position: absolute;  
  58.                     z-index: 99;  
  59.                     -webkit-transform: translate(-50%, 0);  
  60.                     transform: translate(-50%, 0);  
  61.                 }  
  62. </style>  

Load the tooltip

You can include the tooltip as follows.

  1. Chart.defaults.global.customTooltips = function (tooltip) {  
  2.   
  3.             // Tooltip Element  
  4.             var tooltipEl = $('#chartjs-tooltip');  
  5.   
  6.             // Hide if no tooltip  
  7.             if (!tooltip) {  
  8.                 tooltipEl.css({  
  9.                     opacity: 0  
  10.                 });  
  11.                 return;  
  12.             }  
  13.   
  14.             // Set caret Position  
  15.             tooltipEl.removeClass('above below');  
  16.             tooltipEl.addClass(tooltip.yAlign);  
  17.   
  18.             // Set Text  
  19.             tooltipEl.html(tooltip.text);  
  20.   
  21.             // Find Y Location on page  
  22.             var top;  
  23.             if (tooltip.yAlign == 'above') {  
  24.                 top = tooltip.y - tooltip.caretHeight - tooltip.caretPadding;  
  25.             } else {  
  26.                 top = tooltip.y + tooltip.caretHeight + tooltip.caretPadding;  
  27.             }  
  28.   
  29.             // Display, position, and set styles for font  
  30.             tooltipEl.css({  
  31.                 opacity: 1,  
  32.                 left: tooltip.chart.canvas.offsetLeft + tooltip.x + 'px',  
  33.                 top: tooltip.chart.canvas.offsetTop + top + 'px',  
  34.                 fontFamily: tooltip.fontFamily,  
  35.                 fontSize: tooltip.fontSize,  
  36.                 fontStyle: tooltip.fontStyle,  
  37.             });  
  38.         };  

Please note that you can change your tooltip as needed.

Complete HTML

  1. <!doctype html>  
  2. <html>  
  3. <head>  
  4.     <title>Pie Chart with Custom Tooltips</title>  
  5.     <script src="Chart.js"></script>  
  6.     <script src="http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>  
  7.     <style>  
  8.         #canvas-holder {  
  9.             width: 100%;  
  10.             margin-top: 50px;  
  11.             text-align: center;  
  12.         }  
  13.  
  14.         #chartjs-tooltip {  
  15.             opacity: 1;  
  16.             position: absolute;  
  17.             background: rgba(0, 0, 0, .7);  
  18.             color: white;  
  19.             padding: 3px;  
  20.             border-radius: 3px;  
  21.             -webkit-transition: all .1s ease;  
  22.             transition: all .1s ease;  
  23.             pointer-events: none;  
  24.             -webkit-transform: translate(-50%, 0);  
  25.             transform: translate(-50%, 0);  
  26.         }  
  27.  
  28.             #chartjs-tooltip.below {  
  29.                 -webkit-transform: translate(-50%, 0);  
  30.                 transform: translate(-50%, 0);  
  31.             }  
  32.  
  33.                 #chartjs-tooltip.below:before {  
  34.                     border: solid;  
  35.                     border-color: #111 transparent;  
  36.                     border-color: rgba(0, 0, 0, .8) transparent;  
  37.                     border-width: 0 8px 8px 8px;  
  38.                     bottom: 1em;  
  39.                     content: "";  
  40.                     display: block;  
  41.                     left: 50%;  
  42.                     position: absolute;  
  43.                     z-index: 99;  
  44.                     -webkit-transform: translate(-50%, -100%);  
  45.                     transform: translate(-50%, -100%);  
  46.                 }  
  47.  
  48.             #chartjs-tooltip.above {  
  49.                 -webkit-transform: translate(-50%, -100%);  
  50.                 transform: translate(-50%, -100%);  
  51.             }  
  52.  
  53.                 #chartjs-tooltip.above:before {  
  54.                     border: solid;  
  55.                     border-color: #111 transparent;  
  56.                     border-color: rgba(0, 0, 0, .8) transparent;  
  57.                     border-width: 8px 8px 0 8px;  
  58.                     bottom: 1em;  
  59.                     content: "";  
  60.                     display: block;  
  61.                     left: 50%;  
  62.                     top: 100%;  
  63.                     position: absolute;  
  64.                     z-index: 99;  
  65.                     -webkit-transform: translate(-50%, 0);  
  66.                     transform: translate(-50%, 0);  
  67.                 }  
  68.     </style>  
  69. </head>  
  70. <body>  
  71.     Pie Chart With Custom Tooltip @ <a href="www.sibeeshpassion.com">www.sibeeshpassion.com</a>  
  72.     <div id="canvas-holder">  
  73.         <canvas id="chart-area1" width="50" height="50" />  
  74.     </div>  
  75.     <div id="canvas-holder">  
  76.         <canvas id="chart-area2" width="300" height="300" />  
  77.     </div>  
  78.     <div id="chartjs-tooltip"></div>  
  79.   
  80.     <script>  
  81.         Chart.defaults.global.customTooltips = function (tooltip) {  
  82.   
  83.             // Tooltip Element  
  84.             var tooltipEl = $('#chartjs-tooltip');  
  85.   
  86.             // Hide if no tooltip  
  87.             if (!tooltip) {  
  88.                 tooltipEl.css({  
  89.                     opacity: 0  
  90.                 });  
  91.                 return;  
  92.             }  
  93.   
  94.             // Set caret Position  
  95.             tooltipEl.removeClass('above below');  
  96.             tooltipEl.addClass(tooltip.yAlign);  
  97.   
  98.             // Set Text  
  99.             tooltipEl.html(tooltip.text);  
  100.   
  101.             // Find Y Location on page  
  102.             var top;  
  103.             if (tooltip.yAlign == 'above') {  
  104.                 top = tooltip.y - tooltip.caretHeight - tooltip.caretPadding;  
  105.             } else {  
  106.                 top = tooltip.y + tooltip.caretHeight + tooltip.caretPadding;  
  107.             }  
  108.   
  109.             // Display, position, and set styles for font  
  110.             tooltipEl.css({  
  111.                 opacity: 1,  
  112.                 left: tooltip.chart.canvas.offsetLeft + tooltip.x + 'px',  
  113.                 top: tooltip.chart.canvas.offsetTop + top + 'px',  
  114.                 fontFamily: tooltip.fontFamily,  
  115.                 fontSize: tooltip.fontSize,  
  116.                 fontStyle: tooltip.fontStyle,  
  117.             });  
  118.         };  
  119.   
  120.         var pieData = [{  
  121.             value: 300,  
  122.             color: "#F7464A",  
  123.             highlight: "#FF5A5E",  
  124.             label: "Monday"  
  125.         }, {  
  126.             value: 50,  
  127.             color: "#46BFBD",  
  128.             highlight: "#5AD3D1",  
  129.             label: "Tuesday"  
  130.         }, {  
  131.             value: 100,  
  132.             color: "#FDB45C",  
  133.             highlight: "#FFC870",  
  134.             label: "Wednesday"  
  135.         }, {  
  136.             value: 40,  
  137.             color: "#949FB1",  
  138.             highlight: "#A8B3C5",  
  139.             label: "Thursday"  
  140.         }, {  
  141.             value: 120,  
  142.             color: "#4D5360",  
  143.             highlight: "#616774",  
  144.             label: "Friday"  
  145.         }];  
  146.   
  147.         window.onload = function () {  
  148.             var ctx1 = document.getElementById("chart-area1").getContext("2d");  
  149.             window.myPie = new Chart(ctx1).Pie(pieData);  
  150.   
  151.             var ctx2 = document.getElementById("chart-area2").getContext("2d");  
  152.             window.myPie = new Chart(ctx2).Pie(pieData);  
  153.         };  
  154.     </script>  
  155. </body>  
  156. </html>  
Conclusion

I hope you can now create your own chart. That is all for today. Please provide your valuable suggestions.
Please download the source code for more info.

Output

pie chart
piechart

Kindest Regards,

Sibeesh Venu
Sibeesh|Passion