beginUpdate()
Prevents the UI component from refreshing until the endUpdate() method is called.
The beginUpdate() and endUpdate() methods prevent the UI component from excessive updates when you are changing multiple UI component settings at once. After the beginUpdate() method is called, the UI component does not update its UI until the endUpdate() method is called.
See Also
defaultOptions(rule)
| Name | Type | Description |
|---|---|---|
| device | | |
Device parameters. |
| options |
Options to be applied. |
defaultOptions is a static method that the UI component class supports. The following code demonstrates how to specify default properties for all instances of the Button UI component in an application executed on the desktop.
jQuery
DevExpress.ui.dxButton.defaultOptions({
device: { deviceType: "desktop" },
options: {
// Here go the Button properties
}
});Angular
import Button, { Properties } from "devextreme/ui/button";
// ...
export class AppComponent {
constructor () {
Button.defaultOptions<Properties>({
device: { deviceType: "desktop" },
options: {
// Here go the Button properties
}
});
}
}Vue
<template>
<div>
<DxButton id="button1" />
<DxButton id="button2" />
</div>
</template>
<script>
import DxButton from "devextreme-vue/button";
import Button from "devextreme/ui/button";
Button.defaultOptions({
device: { deviceType: "desktop" },
options: {
// Here go the Button properties
}
});
export default {
components: {
DxButton
}
}
</script>React
import dxButton from "devextreme/ui/button";
import Button from "devextreme-react/button";
dxButton.defaultOptions({
device: { deviceType: "desktop" },
options: {
// Here go the Button properties
}
});
export default function App() {
return (
<div>
<Button id="button1" />
<Button id="button2" />
</div>
)
}dispose()
After calling this method, remove the DOM element associated with the UI component:
$("#myButton").dxButton("dispose");
$("#myButton").remove();Use this method only if the UI component was created with jQuery or pure JavaScript. In Angular, Vue, and React, use conditional rendering:
Angular
<dx-button ...
*ngIf="condition">
</dx-button>Vue
<template>
<DxButton ...
v-if="condition">
</DxButton>
</template>
<script>
import DxButton from 'devextreme-vue/button';
export default {
components: {
DxButton
}
}
</script>React
import React from 'react';
import Button from 'devextreme-react/button';
function DxButton(props) {
if (!props.shouldRender) {
return null;
}
return (
<Button ... >
</Button>
);
}
class App extends React.Component {
render() {
return (
<DxButton shouldRender="condition" />
);
}
}
export default App;See Also
getInstance(element)
getInstance is a static method that the UI component class supports. The following code demonstrates how to get the Button instance found in an element with the myButton ID:
// Modular approach
import Button from "devextreme/ui/button";
...
let element = document.getElementById("myButton");
let instance = Button.getInstance(element) as Button;
// Non-modular approach
let element = document.getElementById("myButton");
let instance = DevExpress.ui.dxButton.getInstance(element);See Also
registerKeyHandler(key, handler)
A handler. Accepts the keydown event as the argument. It is a EventObject or a jQuery.Event when you use jQuery.
The key argument accepts one of the following values:
- "backspace"
- "tab"
- "enter"
- "escape"
- "pageUp"
- "pageDown"
- "end"
- "home"
- "leftArrow"
- "upArrow"
- "rightArrow"
- "downArrow"
- "del"
- "space"
- "F"
- "A"
- "asterisk"
- "minus"
A custom handler for a key cancels the default handler for this key.