API - Display a Tooltip
Documentation
This demo illustrates how to show and hide the point’s tooltip with the API. To test this feature, select a continent from the drop-down menu under the PieChart or click a point directly in the PieChart.
www.geohive.com
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var DemoApp = angular.module('DemoApp', ['dx']);
DemoApp.controller('DemoController', function DemoController($scope) {
$scope.selectedRegion = "";
$scope.pieChartOptions = {
type: "doughnut",
palette: "Soft Pastel",
dataSource: dataSource,
title: "The Population of Continents and Regions",
tooltip: {
enabled: false,
format: "millions",
customizeTooltip: function (arg) {
return {
text: arg.argumentText + "<br/>" + arg.valueText
};
}
},
size: {
height:350
},
onPointClick: function(e) {
var point = e.target;
point.showTooltip();
$scope.selectedRegion = point.argument;
},
legend: {
visible: false
},
series: [{
argumentField: "region"
}]
};
$scope.selectBoxOptions = {
width: 250,
dataSource: dataSource,
displayExpr: "region",
valueExpr: "region",
placeholder: "Choose region",
onValueChanged: function(data) {
$("#chart").dxPieChart("instance").getAllSeries()[0].getPointsByArg(data.value)[0].showTooltip();
},
bindingOptions: {
value: "selectedRegion"
}
};
});
<!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/3.4.1/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/cldrjs/0.4.4/cldr.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/cldrjs/0.4.4/cldr/event.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/cldrjs/0.4.4/cldr/supplemental.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/cldrjs/0.4.4/cldr/unresolved.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/globalize/1.1.1/globalize.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/globalize/1.1.1/globalize/message.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/globalize/1.1.1/globalize/number.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/globalize/1.1.1/globalize/currency.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/globalize/1.1.1/globalize/date.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.1.7/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.1.7/css/dx.light.css" />
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.16/angular.min.js"></script>
<script>window.angular || document.write(decodeURIComponent('%3Cscript src="js/angular.min.js"%3E%3C\/script%3E'))</script>
<script src="https://cdn3.devexpress.com/jslib/19.1.7/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" ng-app="DemoApp" ng-controller="DemoController">
<div id="chart" dx-pie-chart="pieChartOptions"></div>
<div class="controls-pane">
<div dx-select-box="selectBoxOptions"></div>
</div>
</div>
</body>
</html>
.controls-pane {
margin-top: 20px;
text-align: center;
}
.dx-selectbox {
display: inline-block;
}
var dataSource = [{
region: "Asia",
val: 4119626293
}, {
region: "Africa",
val: 1012956064
}, {
region: "Northern America",
val: 344124520
}, {
region: "Latin America and the Caribbean",
val: 590946440
}, {
region: "Europe",
val: 727082222
}, {
region: "Oceania",
val: 35104756
}];