JavaScript/jQuery Chart - legend
The Chart UI component can include a legend - an explanatory component that helps you identify a series. Each series is represented by an item on a Legend. An item marker identifies the series color. An item label displays the series title. To set the required position for a legend and its items, to customize the font settings for item labels, and to specify the size of item markers, use the properties of the legend configuration object. To learn more on the legend and its properties, refer to the Legend topic.
backgroundColor
This property supports the following colors:
- Hexadecimal colors
- RGB colors
- RGBA colors
- Predefined/cross-browser color names
- Predefined SVG colors
- Paint server address
columnCount
Use this property when the legend is oriented vertically. Otherwise, use rowCount.
See Also
- legend.columnItemSpacing
customizeHint
| Name | Type | Description |
|---|---|---|
| seriesColor |
The series' color. |
|
| seriesIndex |
The index of the series in the series array. To get the Series object by this index, call the getSeriesByPos(seriesIndex) method. |
|
| seriesName | any |
The series' name. To get the Series object by this name, call the getSeriesByName(seriesName) method. |
customizeItems
Array<BaseChartLegendItem>
Array<BaseChartLegendItem>
The following code shows how to use the customizeItems function to sort legend items alphabetically:
jQuery
$(function() {
$("#chartContainer").dxChart({
// ...
legend: {
customizeItems: function(items) {
return items.sort(function(a, b) {
var itemA = a.text.toLowerCase();
var itemB = b.text.toLowerCase();
if(itemA < itemB) return -1;
if(itemA > itemB) return 1;
return 0;
});
}
}
});
});Angular
<dx-chart ... >
<dxo-legend ...
[customizeItems]="sortLegendItems">
</dxo-legend>
</dx-chart>
// ...
export class AppComponent {
sortLegendItems(items) {
return items.sort((a, b) => {
let itemA = a.text.toLowerCase();
let itemB = b.text.toLowerCase();
if(itemA < itemB) return -1;
if(itemA > itemB) return 1;
return 0;
});
}
}
import { DxChartModule } from 'devextreme-angular';
// ...
@NgModule({
imports: [
// ...
DxChartModule
],
// ...
})
export class AppModule { }Vue
<template>
<DxChart ... >
<DxLegend
:customize-items="sortLegendItems"
/>
</DxChart>
</template>
<script>
import { DxChart, DxLegend } from 'devextreme-vue/chart';
export default {
components: {
DxChart,
DxLegend
},
methods: {
sortLegendItems(items) {
return items.sort((a, b) => {
let itemA = a.text.toLowerCase();
let itemB = b.text.toLowerCase();
if(itemA < itemB) return -1;
if(itemA > itemB) return 1;
return 0;
});
}
}
}
</script>React
import React from 'react';
import { Chart, Legend } from 'devextreme-react/chart';
class App extends React.Component {
render() {
return (
<Chart ... >
<Legend ...
customizeItems={this.sortLegendItems}
/>
</Chart>
);
}
sortLegendItems(items) {
return items.sort((a, b) => {
let itemA = a.text.toLowerCase();
let itemB = b.text.toLowerCase();
if(itemA < itemB) return -1;
if(itemA > itemB) return 1;
return 0;
});
}
}
export default App;ASP.NET MVC Controls
@(Html.DevExtreme().Chart()
@* ... *@
.Legend(l => l
.CustomizeItems("sortLegendItems")
)
)
<script type="text/javascript">
function sortLegendItems (items) {
return items.sort(function(a, b) {
var itemA = a.text.toLowerCase();
var itemB = b.text.toLowerCase();
if(itemA < itemB) return -1;
if(itemA > itemB) return 1;
return 0;
});
}
</script>hoverMode
Specifies what series elements to highlight when a corresponding item in the legend is hovered over.
In the Chart UI component, legend items represent series. When a legend item is hovered over, the corresponding series is highlighted. To prevent this behavior, set the hoverMode property to 'none'.
You can set a custom 'hover' style for a series and/or its points. To do this, use the series' hoverStyle configuration object and/or the point.hoverStyle configuration object.
itemsAlignment
Aligns items in the last column or row (depending on the legend's orientation). Applies when legend items are not divided into columns or rows equally.
markerComponent
An alias for the markerTemplate property specified in React. Accepts a custom component. Refer to Using a Custom Component for more information.
markerRender
An alias for the markerTemplate property specified in React. Accepts a rendering function. Refer to Using a Rendering Function for more information.
markerTemplate
orientation
Arranges legend items vertically (in a column) or horizontally (in a row). The default value is "horizontal" if the legend.horizontalAlignment is "center". Otherwise, it is "vertical".
position
In addition to this property, use the legend's horizontalAlignment, verticalAlignment and orientation properties to specify the legend layout.
rowCount
Use this property when the legend is oriented horizontally. Otherwise, use columnCount.
See Also
- legend.rowItemSpacing
title
To specify only the title's text, assign it directly to this property. Otherwise, set this property to an object with the text and other fields specified.
The title can be accompanied by a subtitle. Assign it to the title.subtitle property.