Created
June 1, 2013 05:36
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Example of live updating Chart.js charts.
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Chart.js Redraw Example</title> | |
| <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.0/jquery.min.js"></script> | |
| <script type="text/javascript" charset="utf-8" src="chart.min.js"></script> | |
| <script type="text/javascript" charset="utf-8"> | |
| window.chartOptions = { | |
| segmentShowStroke: false, | |
| percentageInnerCutout: 75, | |
| animation: false | |
| }; | |
| var chartUpdate = function(value) { | |
| console.log("Updating Chart: ", value); | |
| // Replace the chart canvas element | |
| $('#chart').replaceWith('<canvas id="chart" width="300" height="300"></canvas>'); | |
| // Draw the chart | |
| var ctx = $('#chart').get(0).getContext("2d"); | |
| new Chart(ctx).Doughnut([ | |
| { value: value, | |
| color: '#4FD134' }, | |
| { value: 100-value, | |
| color: '#DDDDDD' }], | |
| window.chartOptions); | |
| // Schedule next chart update tick | |
| setTimeout (function() { chartUpdate(value - 1); }, 1000); | |
| } | |
| $(document).ready(function() { | |
| setTimeout (function() { chartUpdate(99); }, 1000); | |
| }) | |
| </script> | |
| </head> | |
| <body> | |
| <canvas id="chart" width="300" height="300"></canvas> | |
| </body> | |
| </html> |
@Siddhant08 He isn't, he is using:
setTimeout (function() { chartUpdate(value - 1); }, 1000);
at the end of chartUpdate to call the function again with a different value, this is also known as recursive programming.
Replacing the canvas to update the chart is brilliant! I tried with Chart.update() but never got it to work.
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Hi! I am new to js and other web development tools. Can you please tell me at what part of your code you are accessing your database server to plot the real-time graph?
Thanks in advance. :)