window.onload = function () {
const palette = ko.observable(paletteCollection[0]);
const paletteExtensionMode = ko.observable('Blend');
const viewModel = {
chartOptions: {
palette,
dataSource,
series: {},
paletteExtensionMode,
legend: {
visible: false,
},
},
paletteSelectBoxOptions: {
items: paletteCollection,
value: palette,
},
extensionModeSelectBoxOptions: {
items: paletteExtensionModes,
value: paletteExtensionMode,
},
baseColors: ko.computed(() => DevExpress.viz.getPalette(palette()).simpleSet),
};
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/3.5.1/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/knockout/3.4.2/knockout-min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/22.2.3/css/dx.light.css" />
<script src="https://cdn3.devexpress.com/jslib/22.2.3/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 class="flex-container">
<div id="pie" class="flex-block" data-bind="dxPieChart: chartOptions"></div>
<div class="palette-container flex-block" data-bind="foreach: {data: baseColors, as: 'color'}">
<div class="palette-item" data-bind="style: {backgroundColor: color}"></div>
</div>
</div>
<div class="options">
<div class="caption">Options</div>
<div class="option">
<span>Palette</span>
<div data-bind="dxSelectBox: paletteSelectBoxOptions"></div>
</div>
<div class="option">
<span>Palette Extension Mode</span>
<div data-bind="dxSelectBox: extensionModeSelectBoxOptions"></div>
</div>
</div>
</div>
</div>
</body>
</html>
.flex-container {
display: flex;
justify-content: center;
align-items: center;
flex-direction: row;
}
#pie {
height: 350px;
width: 500px;
margin: 20px;
}
.palette-container {
float: left;
}
.palette-item {
width: 40px;
height: 40px;
}
.options {
padding: 20px;
background-color: rgba(191, 191, 191, 0.15);
margin-top: 20px;
}
.caption {
font-size: 18px;
font-weight: 500;
}
.option {
display: inline-block;
min-width: 320px;
margin-top: 5px;
}
.option > span {
margin: 0 10px 0 0;
}
.option > .dx-widget {
display: inline-block;
vertical-align: middle;
}
const paletteCollection = ['Material', 'Soft Pastel', 'Harmony Light', 'Pastel', 'Bright', 'Soft', 'Ocean', 'Office', 'Vintage', 'Violet', 'Carmine', 'Dark Moon', 'Soft Blue', 'Dark Violet', 'Green Mist'];
const paletteExtensionModes = ['Alternate', 'Blend', 'Extrapolate'];
const dataSource = [];
let i;
for (i = 0; i < 20; i += 1) {
dataSource.push({
arg: `item${i}`,
val: 1,
});
}