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Last time I used chart.js, I had 17 different charts to create.
As long as you can easily grab all of your canvas
tags, you can add them all to a object array like this:
//Get array of all canvases on the DOM
var chartCount = $('canvas').length;
for (var i = 1; i < chartCount; i++) {
//Get DOM element of canvas
var el = $('chart').get(i);
//Add new entry to canvas array with DOM element and canvas context
canvas[i] = {
'DOM_Element': el,
'context': el.getContext('2d')
};
}
Then each canvas context can be referenced with something like canvas[x]['context']
.
You could then write a function to loop through all entires in the canvas array adding gradients as desired.
Source:stackexchange.com