Memory leak when redrawing graphs #64
Description
When I call Morris.Line(...) many times within a web page, the browser leaks memory.
I noticed the problem when designing a web page that uses a 1 second timeout to load new data points (via ajax), then I plot the new points using Morris.Line(). Thus the webpage has the appearance of a rolling graph, which looks great. But the browser leaks memory like crazy (1MB/second or more in my project).
Ajax might contribute to the leaks, so I created a simple example with no ajax (html below). My browser leaks around 5MB/minute while viewing the sample. I measure the leaks using Windows Task Manager. I'm running Windows 7 Professional. I see similar leakage rates in Chrome 17.0.963.79 m and Firefox 12.0 .
<title>Real time data</title> <script src="js/jquery-1.7.1.min.js"></script> <script src="js/raphael-2.0.2-min.js"></script> <script src="js/morris.min.js"></script> Graph 0 <script> var nReloads = 0; function draw() { Morris.Line({ element: 'graph0', data: [ {'date': '2012-06-01 15:06:57', 'Apples': 672, 'Bananas': 644, 'Oranges': 185, 'Peaches': 218, 'Pears': 0}, {'date': '2012-06-01 15:06:58', 'Apples': 380, 'Bananas': 259, 'Oranges': 65, 'Peaches': 115, 'Pears': 0}, {'date': '2012-06-01 15:06:59', 'Apples': 305, 'Bananas': 258, 'Oranges': 60, 'Peaches': 132, 'Pears': 0}, {'date': '2012-06-01 15:07:00', 'Apples': 568, 'Bananas': 481, 'Oranges': 137, 'Peaches': 215, 'Pears': 0}, {'date': '2012-06-01 15:07:01', 'Apples': 654, 'Bananas': 538, 'Oranges': 162, 'Peaches': 265, 'Pears': 0}, ], xkey: 'date', ykeys: ['Apples', 'Bananas', 'Oranges', 'Peaches', 'Pears'], labels: ['Apples', 'Bananas', 'Oranges', 'Peaches', 'Pears'], parseTime: false, hideHover: true, ymin: 0, ymax: 'auto 100' }); nReloads++; $('#reloadStatus').text(nReloads + ' reloads'); setTimeout(function() { draw(); }, 1000); } draw(); </script>