chart.js bar chart color change based on value

Question

I have a bar chart that is showing data from a database and I need to be able to show a different color for different numeric values. For example the 'loc_health' returns values between 1 and 10 based, so I need to show 1 as red, 2 as orange, 3 as yellow, 4 as green etc...

I have searched the chart.js documentation but cannot find a solution for this.

var context = document.getElementById('healthRatings').getContext('2d');

window.myObjBar = new Chart(context).Bar({
    labels : loc_id_grab,
    datasets : [{
        fillColor : ["rgba(220,220,220,0.5)"],
        strokeColor : "rgba(151,187,205,1)",
        pointColor : "rgba(151,187,205,1)",
        pointStrokeColor : "#fff",
        data : loc_health
    }]
}, {
    scaleOverride : true,
    scaleSteps : 10,
    scaleStepWidth : 1,
    scaleStartValue : 0,
    barShowStroke : false,
    barStrokeWidth : 1,
    showTooltips : false,
    barValueSpacing : 2,
    animation : false,
    responsive : true,
    maintainAspectRatio : true
});

Answer 1

You could instead check the value before you create the chart:

var context = document.getElementById('healthRatings').getContext('2d');

var colors = []
for(var i = 0; i < loc_health.length; i++){
   var color;
   switch(loc_health[i]){
       case 1:
           color = "red";
           break;
       case 2:
           color = "orange";
           break;
       case 3:
           color = "yellow";
           break;
       case 4:
           color = "green";
           break;
       //etc..
   }
   colors[i] = color;
}

window.myObjBar = new Chart(context).Bar({
    labels : loc_id_grab,
    datasets : [{
        backgroundColor: colors,
        strokeColor : "rgba(151,187,205,1)",
        pointColor : "rgba(151,187,205,1)",
        pointStrokeColor : "#fff",
        data : loc_health
    }]
}, {
    scaleOverride : true,
    scaleSteps : 10,
    scaleStepWidth : 1,
    scaleStartValue : 0,
    barShowStroke : false,
    barStrokeWidth : 1,
    showTooltips : false,
    barValueSpacing : 2,
    animation : false,
    responsive : true,
    maintainAspectRatio : true
});