score:50

Accepted answer

here you go:

jsfiddle: http://jsfiddle.net/1v9fy5mz/

code:

html

<canvas id="canvas"></canvas>

js:

var ctx = document.getelementbyid("canvas").getcontext("2d");

var data = {
  labels: ['january', 'february', 'march'],
  datasets: [{
    data: [1, 2, 3]
  }]
};

var mylinechart = new chart(ctx, {
  type: 'line',
  data: data,
  options: {
    showalltooltips: true,
    tooltips: {
      custom: function(tooltip) {
        if (!tooltip) return;
        // disable displaying the color box;
        tooltip.displaycolors = false;
      },
      callbacks: {
        // use label callback to return the desired label
        label: function(tooltipitem, data) {
          return tooltipitem.xlabel + " :" + tooltipitem.ylabel;
        },
        // remove title
        title: function(tooltipitem, data) {
          return;
        }
      }
    }
  }
});

score:6

tooltips: {
      displaycolors: false,
      callbacks: {
        // use label callback to return the desired label
        label: function(tooltipitem, data) {
          return tooltipitem.xlabel + " :" + tooltipitem.ylabel;
        },
        // remove title
        title: function(tooltipitem, data) {
          return;

        }
      }
    }

score:68

add this in your options object

tooltips: {
  displaycolors: false
}

update for version 3 or greater (from @hanumandev below):

remove 's' from tooltips

tooltip: {
  displaycolors: false
}

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