Different color for each bar in a bar chart ChartJS

Question

I m using ChartJS in a project I m working on and I need a different color for each bar in a Bar Chart    Here s an example of the bar chart data set   var barChartData       labels    001    002    003    004    005    006    007      datasets         label   My First dataset       fillColor   rgba 220 220 220 0 5         strokeColor   rgba 220 220 220 0 8         highlightFill   rgba 220 220 220 0 75        highlightStroke   rgba 220 220 220 1        data   20  59  80  81  56  55  40            Is there any way to paint each bar differently

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Code based on the following pull request   datapoint color    hsl      360   index   data length       100   50

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If you know which colors you want  you can specify color properties in an array  like so       backgroundColor         rgba 75  192  192  1                       borderColor         rgba 75  192  192  1

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You can call this function which generates random colors for each bars      var randomColorGenerator   function           return        Math random   toString 16     0000000   slice 2  8        var barChartData             labels    001    002    003    004    005    006    007            datasets                                  label   My First dataset                   fillColor  randomColorGenerator                     strokeColor  randomColorGenerator                     highlightFill  randomColorGenerator                    highlightStroke  randomColorGenerator                    data   20  59  80  81  56  55  40

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Generate random colors   function getRandomColor         var letters    0123456789ABCDEF  split          var color            for  var i   0  i  lt  6  i              color    letters Math floor Math random     16              return color      and call it for each record   function getRandomColorEachEmployee count        var data          for  var i   0  i  lt  count  i              data push getRandomColor               return data      finally set colors   var data         labels  jsonData employees     your labels     datasets             data  jsonData approvedRatios     your data         backgroundColor  getRandomColorEachEmployee jsonData employees length

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Here  I solved this issue by making two functions   1  dynamicColors   to generate random color  function dynamicColors         var r   Math floor Math random     255       var g   Math floor Math random     255       var b   Math floor Math random     255       return  rgba     r         g         b      0 5        2  poolColors   to create array of colors  function poolColors a        var pool           for i   0  i  lt  a  i              pool push dynamicColors               return pool      Then  just pass it   datasets         data  arrData      backgroundColor  poolColors arrData length       borderColor  poolColors arrData length       borderWidth  1

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You can generate easily with livegap charts   Select Mulicolors from Bar menu    source  livegap com      chart library used is chartnew js modified version of chart js library  with chartnew js code will be something like this  var barChartData             labels    001    002    003    004    005    006    007            datasets                                  label   My First dataset                   fillColor    rgba 0 10 220 0 5    rgba 220 0 10 0 5    rgba 220 0 0 0 5    rgba 120 250 120 0 5                      strokeColor   rgba 220 220 220 0 8                     highlightFill   rgba 220 220 220 0 75                    highlightStroke   rgba 220 220 220 1                    data   20  59  80  81  56  55  40

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If you take a look at the library  ChartNew   which builds upon Chart js you can do this by passing the values in as an array like so   var data         labels    Batman    Iron Man    Captain America    Robin        datasets                          label   My First dataset               fillColor    rgba 220 220 220 0 5     navy    red    orange                strokeColor   rgba 220 220 220 0 8                highlightFill   rgba 220 220 220 0 75                highlightStroke   rgba 220 220 220 1                data   2000  1500  1750  50

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As of August 2019  Chart js now has this functionality built in      You simply need to provide an array to backgroundColor   Example taken from https   www chartjs org docs latest getting-started   Before     data            labels    January    February    March    April    May    June    July            datasets                 label   My First dataset               backgroundColor   rgb 255  99  132                borderColor   rgb 255  99  132                data   0  10  5  2  20  30  45                      After     data            labels    January    February    March    April    May    June    July            datasets                 label   My First dataset               backgroundColor    rgb 255  99  132    rgb 0  255  0    rgb 255  99  132    rgb 128  255  0    rgb 0  255  255    rgb 255  255  0    rgb 255  255  128                 borderColor   rgb 255  99  132                data   0  10  5  2  20  30  45                      I just tested this method and it works  Each bar has a different color

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here is how I dealed  I pushed an array  colors   with same number of entries than number of datas  For this I added a function  getRandomColor  at the end of the script  Hope it helps     for  var i in arr        customers push arr i  customer       nb cases push arr i  nb cases       colors push getRandomColor        window onload   function         var config             type   pie           data                labels  customers              datasets                     label   Nomber of cases by customers                   data  nb cases                  fill  true                  backgroundColor  colors                                    options                responsive  true              title                    display  true                  text   Cases by customers                                       var ctx   document getElementById  canvas   getContext  2d        window myLine   new Chart ctx  config       function getRandomColor         var letters    0123456789ABCDEF  split          var color            for  var i   0  i  lt  6  i              color    letters Math floor Math random     16              return color

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Taking the other answer  here is a quick fix if you want to get a list with random colors for each bar   function getRandomColor n        var letters    0123456789ABCDEF  split          var color            var colors           for var j   0  j  lt  n  j             for  var i   0  i  lt  6  i                   color    letters Math floor Math random     16                      colors push color           color                  return colors      Now you could use this function in the backgroundColor field in data   data            labels  count 0           datasets                 label   Registros en BDs               data  count 1               backgroundColor  getRandomColor count 1  length

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As of v2  you can simply specify an array of values to correspond to a color for each bar via the backgroundColor property   datasets       label   My First dataset     data   20  59  80  81  56  55  40     backgroundColor    red    blue    green    blue    red    blue             This is also possible for the borderColor  hoverBackgroundColor  hoverBorderColor   From the documentation on the Bar Chart Dataset Properties      Some properties can be specified as an array  If these are set to an array value  the first value applies to the first bar  the second value to the second bar  and so on

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Here s a way to generate consistent random colors using color-hash  const colorHash   new ColorHash    const datasets        label   Balance     data    values balances     backgroundColor    keys balances  map name   gt  colorHash hex name

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try this      function getChartJs               var dynamicColors   function                  var r   Math floor Math random     255               var g   Math floor Math random     255               var b   Math floor Math random     255               return  rgb     r         g         b                               ajax               type   POST               url   ADMIN DEFAULT aspx GetChartByJenisKerusakan               data                    contentType   application json  charset utf-8               dataType   json               success  function  r                    var labels   r d 0                   var series1   r d 1                   var data                         labels  r d 0                       datasets                                                          label   My First dataset                               data  series1                              strokeColor    77a8a8                               pointColor    eca1a6                                                                                      var ctx       bar chart   get 0  getContext  2d                    ctx canvas height   300                  ctx canvas width   500                  var lineChart   new Chart ctx  Bar data                        bezierCurve  false                      title                                                    display  true                            text   ProductWise Sales Count                                               responsive  true                      maintainAspectRatio  true                                        each r d  function  key  value                          lineChart datasets 0  bars key  fillColor   dynamicColors                        lineChart datasets 0  bars key  fillColor   dynamicColors                          lineChart update                                                   failure  function  r                    alert r d                              error  function  r                    alert r d

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Solution  call the update method to set new values      var barChartData         labels    January    February    March        datasets                          label   My First dataset               fillColor   rgba 220 220 220 0 5                 strokeColor   rgba 220 220 220 0 8                 highlightFill   rgba 220 220 220 0 75                highlightStroke   rgba 220 220 220 1                data   20  59  80                      window onload   function        var ctx   document getElementById  mycanvas   getContext  2d        window myObjBar   new Chart ctx  Bar barChartData              responsive   true                nuevos colores     myObjBar datasets 0  bars 0  fillColor    green     bar 1     myObjBar datasets 0  bars 1  fillColor    orange     bar 2     myObjBar datasets 0  bars 2  fillColor    red     bar 3     myObjBar update

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This works for me in the current version 2 7 1   function colorizePercentageChart myObjBar     var bars   myObjBar data datasets 0  data  console log myObjBar data datasets 0    for  i   0  i  lt  bars length  i           var color    green        if parseFloat bars i     lt  95           color    yellow             if parseFloat bars i     lt  50            color    red              console log color       myObjBar data datasets 0  backgroundColor i    color     myObjBar update

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what I ve done is create a random color generator as many here have suggested function dynamicColors             var r   Math floor Math random     255           var g   Math floor Math random     255           var b   Math floor Math random     255           return  quot rgba  quot    r    quot   quot    g    quot   quot    b    quot   0 5  quot          and then coded this var chartContext   document getElementById  line-chart        let lineChart   new Chart chartContext            type   bar           data                 labels   lt  php echo json encode  names     gt               datasets                     data    lt  php echo json encode  salaries     gt                   borderWidth  1                  backgroundColor  dynamicColors                                             options                scales                    yAxes                         ticks                            beginAtZero  true                                                                     responsive  true              maintainAspectRatio  false                     Notice there is no parantheses at the function call This enables the code to call the function every time  instead of making an array This also prevents the code from using the same color for all the bars

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I have just got this issue recently  and here is my solution  var labels     001    002    003    004    005    006    007    var data    20  59  80  81  56  55  40   for  var i   0  len   labels length  i  lt  len  i         background colors push getRandomColor       I use  Benjamin method here    var barChartData       labels  labels    datasets         label   My First dataset       fillColor   rgba 220 220 220 0 5         strokeColor   rgba 220 220 220 0 8         highlightFill   rgba 220 220 220 0 75        highlightStroke   rgba 220 220 220 1        backgroundColor  background colors      data  data

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After looking into the Chart Bar js file I ve managed to find the solution  I ve used this function to generate a random color   function getRandomColor         var letters    0123456789ABCDEF  split          var color            for  var i   0  i  lt  6  i               color    letters Math floor Math random     16              return color      I ve added it to the end of the file and i called this function right inside the  fillColor   under  helpers each dataset data function dataPoint index                         Add a new point for each piece of data  passing any required data to draw    so now it looks like this   helpers each dataset data function dataPoint index                         Add a new point for each piece of data  passing any required data to draw                       datasetObject bars push new this BarClass                           value   dataPoint                          label   data labels index                           datasetLabel  dataset label                          strokeColor   dataset strokeColor                          fillColor   getRandomColor                            highlightFill   dataset highlightFill    dataset fillColor                          highlightStroke   dataset highlightStroke    dataset strokeColor                                            this     and it works I get different color for each bar

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If you re not able to use NewChart js you just need to change the way to set the color using array instead  Find the helper iteration inside Chart js   Replace this line   fillColor   dataset fillColor    For this one   fillColor   dataset fillColor index     The resulting code     Iterate through each of the datasets  and build this into a property of the chart   helpers each data datasets function dataset datasetIndex        var datasetObject           label   dataset label    null        fillColor   dataset fillColor        strokeColor   dataset strokeColor        bars                  this datasets push datasetObject        helpers each dataset data function dataPoint index           Add a new point for each piece of data  passing any required data to draw        datasetObject bars push new this BarClass           value   dataPoint          label   data labels index           datasetLabel  dataset label          strokeColor   dataset strokeColor            Replace this - gt  fillColor   dataset fillColor             Whith the following          fillColor   dataset fillColor index           highlightFill   dataset highlightFill    dataset fillColor          highlightStroke   dataset highlightStroke    dataset strokeColor                  this        this     And in your js   datasets                                        label   My First dataset                     fillColor    rgba 205 64 64 0 5     rgba 220 220 220 0 5     rgba 24 178 235 0 5     rgba 220 220 220 0 5                       strokeColor   rgba 220 220 220 0 8                      highlightFill   rgba 220 220 220 0 75                      highlightStroke   rgba 220 220 220 1                      data   2000  1500  1750  50

[javascript] Different color for each bar in a bar chart; ChartJS

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