Customize Points and Labels
Documentation
This demo shows how you can customize individual points and labels in the Chart.
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window.onload = function() {
var highAverage = 77,
lowAverage = 58;
var viewModel = {
chartOptions: {
dataSource: dataSource,
customizePoint: function() {
if(this.value > highAverage) {
return { color: "#ff7c7c", hoverStyle: { color: "#ff7c7c" } };
} else if(this.value < lowAverage) {
return { color: "#8c8cff", hoverStyle: { color: "#8c8cff" } };
}
},
customizeLabel: function() {
if (this.value > highAverage) {
return {
visible: true,
backgroundColor: "#ff7c7c",
customizeText: function () {
return this.valueText + "°F";
}
};
}
},
"export": {
enabled: true
},
valueAxis: {
visualRange: {
startValue: 40
},
maxValueMargin: 0.01,
label: {
customizeText: function() {
return this.valueText + "°F";
}
},
constantLines: [{
label: {
text: "Low Average"
},
width: 2,
value: lowAverage,
color: "#8c8cff",
dashStyle: "dash"
}, {
label: {
text: "High Average"
},
width: 2,
value: highAverage,
color: "#ff7c7c",
dashStyle: "dash"
}]
},
series: [ {
argumentField: "day",
valueField: "temperature",
type: "bar",
color: "#e7d19a"
}],
title: {
text: "Daily Temperature in May"
},
legend: {
visible: false
}
}
};
ko.applyBindings(viewModel, document.getElementById("chart-demo"));
};
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>DevExtreme Demo</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<script>window.jQuery || document.write(decodeURIComponent('%3Cscript src="js/jquery.min.js"%3E%3C/script%3E'))</script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.2/knockout-min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/18.2.7/css/dx.common.css" />
<link rel="dx-theme" data-theme="generic.light" href="https://cdn3.devexpress.com/jslib/18.2.7/css/dx.light.css" />
<script src="https://cdn3.devexpress.com/jslib/18.2.7/js/dx.all.js"></script>
<script src="data.js"></script>
<link rel="stylesheet" type ="text/css" href ="styles.css" />
<script src="index.js"></script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<div id="chart-demo">
<div id="chart" data-bind="dxChart: chartOptions"></div>
</div>
</div>
</body>
</html>
#chart {
height: 440px;
width: 100%;
}
var dataSource = [{
day: '1',
temperature: 57
}, {
day: '2',
temperature: 58
}, {
day: '3',
temperature: 57
}, {
day: '4',
temperature: 59
}, {
day: '5',
temperature: 63
}, {
day: '6',
temperature: 63
}, {
day: '7',
temperature: 63
}, {
day: '8',
temperature: 64
}, {
day: '9',
temperature: 64
}, {
day: '10',
temperature: 64
}, {
day: '11',
temperature: 69
}, {
day: '12',
temperature: 72
}, {
day: '13',
temperature: 75
}, {
day: '14',
temperature: 78
}, {
day: '15',
temperature: 76
}, {
day: '16',
temperature: 70
}, {
day: '17',
temperature: 65
}, {
day: '18',
temperature: 65
}, {
day: '19',
temperature: 68
}, {
day: '20',
temperature: 70
}, {
day: '21',
temperature: 73
}, {
day: '22',
temperature: 73
}, {
day: '23',
temperature: 75
}, {
day: '24',
temperature: 78
}, {
day: '25',
temperature: 76
}, {
day: '26',
temperature: 76
}, {
day: '27',
temperature: 80
}, {
day: '28',
temperature: 76
}, {
day: '29',
temperature: 75
}, {
day: '30',
temperature: 75
}, {
day: '31',
temperature: 74
}];