Client-Side Data Processing
Documentation
The DevExtreme HTML5 Widgets can get data from a remote storage and process it on the client. This demo shows the Chart widget whose data source loads all data from a remote JSON file in one query. Afterwards, different filters are applied to this data depending on a value of the drop-down menu under the chart.
weatherbase.com
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<template>
<div id="chart-demo">
<dx-chart
ref="chart"
:data-source="monthWeather"
:customize-point="customizePoint"
title="Temperature in Barcelona: January 2012"
>
<dx-size :height="420"/>
<dx-value-axis>
<dx-label
:customize-text="customizeLabelText"
:visible="true"
/>
</dx-value-axis>
<dx-series
argument-field="day"
value-field="t"
type="bar"
/>
<dx-legend :visible="false"/>
<dx-export :enabled="true"/>
<dx-loading-indicator :show="true"/>
</dx-chart>
<div class="action">
<dx-select-box
id="choose-temperature"
:data-source="temperature"
:width="70"
:value="6"
:on-value-changed="changeTemperature"
/>
<div class="label">Choose a temperature threshold, °C:
</div>
</div>
</div>
</template>
<script>
import DxChart, {
DxValueAxis,
DxLabel,
DxLegend,
DxExport,
DxSeries,
DxSize,
DxLoadingIndicator
} from 'devextreme-vue/chart';
import DxSelectBox from 'devextreme-vue/select-box';
import DataSource from 'devextreme/data/data_source';
import CustomStore from 'devextreme/data/custom_store';
const palette = ['#c3a2cc', '#b7b5e0', '#e48cba'];
export default {
components: {
DxChart,
DxValueAxis,
DxLabel,
DxLegend,
DxExport,
DxLoadingIndicator,
DxSeries,
DxSize,
DxSelectBox
},
data() {
let paletteIndex = 0;
const monthWeather = new DataSource({
store: new CustomStore({
load: () => {
return fetch('../../../../data/monthWeather.json')
.then(e => e.json())
.catch(() => { throw 'Data Loading Error'; });
},
loadMode: 'raw'
}),
filter: ['t', '>', '6'],
paginate: false
});
return {
temperature: [6, 7, 8, 9, 10, 11, 12],
monthWeather,
paletteIndex
};
},
methods: {
changeTemperature(e) {
this.$refs.chart.instance.showLoadingIndicator();
this.monthWeather.filter(['t', '>', e.value]);
this.monthWeather.load();
},
customizeLabelText(e) {
return `${e.valueText}${'°C'}`;
},
customizePoint() {
const color = palette[this.paletteIndex];
this.paletteIndex = this.paletteIndex === 2 ? 0 : this.paletteIndex + 1;
return { color };
},
}
};
</script>
<style>
#choose-temperature {
float: right;
}
.action {
width: 320px;
margin-top: 20px;
}
.label {
padding-top: 9px;
}
</style>
import Vue from 'vue';
import App from './App.vue';
new Vue({
el: '#app',
components: { App },
template: '<App/>'
});
<!DOCTYPE html>
<html>
<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" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.1.4/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.1.4/css/dx.light.css" />
<script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script>
<script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script>
<script type="text/javascript" src="config.js"></script>
<script type="text/javascript">
System.import('./index.js');
</script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<div id="app">
<span v-if="false">Loading...</span>
</div>
</div>
</body>
</html>
System.config({
transpiler: 'plugin-babel',
paths: {
'npm:': 'https://unpkg.com/'
},
map: {
vue: 'npm:vue@2.6.3/dist/vue.esm.browser.js',
'vue-loader': 'npm:systemjs-vue-browser@latest/index.js',
'devextreme': 'npm:devextreme@19.1',
'devextreme-vue': 'npm:devextreme-vue@19.1',
jszip: 'npm:jszip@3.1.3/dist/jszip.min.js',
'quill': 'npm:quill@1.3.6/dist/quill.js',
'devexpress-diagram': 'npm:devexpress-diagram',
'plugin-babel': 'npm:systemjs-plugin-babel@0/plugin-babel.js',
'systemjs-babel-build': 'npm:systemjs-plugin-babel@0/systemjs-babel-browser.js'
},
meta: {
'*.vue': {
loader: 'vue-loader'
}
},
packages: {
'devextreme-vue': {
main: 'index.js'
},
'devextreme': {
defaultExtension: 'js'
}
},
babelOptions: {
sourceMaps: false,
stage0: true
}
});