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< h1 id = "mixed-chart-types" > Mixed Chart Types< / h1 >
< p > With Chart.js, it is possible to create mixed charts that are a combination of two or more different chart types. A common example is a bar chart that also includes a line dataset.< / p >
< p > Creating a mixed chart starts with the initialization of a basic chart.< / p >
< pre > < code class = "lang-javascript" > < span class = "hljs-keyword" > var< / span > myChart = < span class = "hljs-keyword" > new< / span > Chart(ctx, {
type: < span class = "hljs-string" > ' bar' < / span > ,
data: data,
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< p > At this point we have a standard bar chart. Now we need to convert one of the datasets to a line dataset.< / p >
< pre > < code class = "lang-javascript" > < span class = "hljs-keyword" > var< / span > mixedChart = < span class = "hljs-keyword" > new< / span > Chart(ctx, {
type: < span class = "hljs-string" > ' bar' < / span > ,
data: {
datasets: [{
label: < span class = "hljs-string" > ' Bar Dataset' < / span > ,
data: [< span class = "hljs-number" > 10< / span > , < span class = "hljs-number" > 20< / span > , < span class = "hljs-number" > 30< / span > , < span class = "hljs-number" > 40< / span > ]
}, {
label: < span class = "hljs-string" > ' Line Dataset' < / span > ,
data: [< span class = "hljs-number" > 50< / span > , < span class = "hljs-number" > 50< / span > , < span class = "hljs-number" > 50< / span > , < span class = "hljs-number" > 50< / span > ],
< span class = "hljs-comment" > // Changes this dataset to become a line< / span >
type: < span class = "hljs-string" > ' line' < / span >
}],
labels: [< span class = "hljs-string" > ' January' < / span > , < span class = "hljs-string" > ' February' < / span > , < span class = "hljs-string" > ' March' < / span > , < span class = "hljs-string" > ' April' < / span > ]
},
options: options
});
< / code > < / pre >
< p > At this point we have a chart rendering how we' d like. It' s important to note that the default options for a line chart are not merged in this case. Only the options for the default type are merged in. In this case, that means that the default options for a bar chart are merged because that is the type specified by the < code > type< / code > field.< / p >
< p > < div class = "chartjs-wrapper" > < canvas id = "chartjs-7" class = "chartjs" width = "undefined" height = "undefined" > < / canvas > < script > new Chart ( document . getElementById ( "chartjs-7" ) , { "type" : "bar" , "data" : { "labels" : [ "January" , "February" , "March" , "April" ] , "datasets" : [ { "label" : "Bar Dataset" , "data" : [ 10 , 20 , 30 , 40 ] , "borderColor" : "rgb(255, 99, 132)" , "backgroundColor" : "rgba(255, 99, 132, 0.2)" } , { "label" : "Line Dataset" , "data" : [ 50 , 50 , 50 , 50 ] , "type" : "line" , "fill" : false , "borderColor" : "rgb(54, 162, 235)" } ] } , "options" : { "scales" : { "yAxes" : [ { "ticks" : { "beginAtZero" : true } } ] } } } ) ; < / script > < / div > < / p >
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