[Chartjs]-Chart.js coffeescript can't find variable

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pollPieChart is a local variable, not a property on the event’s this context.

Inside the 'data:update' event listener, js automatically sets this to be the element on which the event occurred (document.getElementById('')).

Simply removing the this. from before pollPieChart inside the callback should fix it, as it is defined within the current closure, not the global window object.

To place it on the global window (though it’s not necessary here),use

window.pollPieChart = new Chart(ctx,
  type: 'pie'
  data: data
  animation: animateRotate:true)

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