JavaScript/jQuery Sparkline Methods
This section describes the methods that can be used in code to manipulate objects related to the Bullet UI component.
beginUpdate()
Postpones rendering that can negatively affect performance until the endUpdate() method is called.
The beginUpdate() and endUpdate() methods reduce the number of renders in cases where extra rendering can negatively affect performance.
See Also
dispose()
jQuery
After calling this method, remove the DOM element associated with the UI component:
$("#mySparkline").dxSparkline("dispose");
$("#mySparkline").remove();Angular
Use conditional rendering instead of this method:
<dx-sparkline ...
*ngIf="condition">
</dx-sparkline>Vue
Use conditional rendering instead of this method:
<template>
<DxSparkline ...
v-if="condition">
</DxSparkline>
</template>
<script>
import DxSparkline from 'devextreme-vue/sparkline';
export default {
components: {
DxSparkline
}
}
</script>React
Use conditional rendering instead of this method:
import React from 'react';
import Sparkline from 'devextreme-react/sparkline';
function DxSparkline(props) {
if (!props.shouldRender) {
return null;
}
return (
<Sparkline ... >
</Sparkline>
);
}
class App extends React.Component {
render() {
return (
<DxSparkline shouldRender="condition" />
);
}
}
export default App;endUpdate()
Refreshes the UI component after a call of the beginUpdate() method.
The beginUpdate() and endUpdate() methods reduce the number of renders in cases where extra rendering can negatively affect performance.
See Also
getDataSource()
Gets the DataSource instance.
See Also
getInstance(element)
getInstance is a static method that the UI component class supports. The following code demonstrates how to get the Sparkline instance found in an element with the mySparkline ID:
// Modular approach
import Sparkline from "devextreme/viz/sparkline";
...
let element = document.getElementById("mySparkline");
let instance = Sparkline.getInstance(element) as Sparkline;
// Non-modular approach
let element = document.getElementById("mySparkline");
let instance = DevExpress.viz.dxSparkline.getInstance(element);See Also
getSize()
Returns an object with the following fields.
- width
The width of the UI component in pixels. - height
The height of the UI component in pixels.
See Also
on(eventName, eventHandler)
Use this method to subscribe to one of the events listed in the Events section.
See Also
on(events)
Use this method to subscribe to several events with one method call. Available events are listed in the Events section.