[Chartjs]-Chartjs update() not updating

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3👍

If I rememeber, chart.js assigns these objects to own variables passed by reference so try mutating in place instead of assigning(=) to config property.

function update_chart_data(id){
  $('canvas[id^="rank-"]').each(function(){
      var id = parseInt($(this).attr('value'));
      id --;
      var i;
      var update_data = data_array2[keyArr2[id]];//here is to get update data
      var data = rank_chart.config.data;
      data.datasets[0].data.length = 0;
      data.labels.length = 0
      for(i = 0; i < update_data.length ; i++){
          data.labels.push(update_data[i]['numberId']);
          data.datasets[0].data.push(update_data[i]['value']);
      }

      rank_chart.update();
  });
}

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