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)
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 Calendar UI component in an application executed on the desktop.
jQuery
DevExpress.ui.dxCalendar.defaultOptions({
device: { deviceType: "desktop" },
options: {
// Here go the Calendar properties
}
});Angular
import Calendar from "devextreme/ui/calendar";
// ...
export class AppComponent {
constructor () {
Calendar.defaultOptions({
device: { deviceType: "desktop" },
options: {
// Here go the Calendar properties
}
});
}
}Vue
<template>
<div>
<DxCalendar id="calendar1" />
<DxCalendar id="calendar2" />
</div>
</template>
<script>
import DxCalendar from "devextreme-vue/calendar";
import Calendar from "devextreme/ui/calendar";
Calendar.defaultOptions({
device: { deviceType: "desktop" },
options: {
// Here go the Calendar properties
}
});
export default {
components: {
DxCalendar
}
}
</script>React
import React, {useEffect} from "react";
import dxCalendar from "devextreme/ui/calendar";
import Calendar from "devextreme-react/calendar";
export default function App() {
useEffect(() => {
dxCalendar.defaultOptions({
device: { deviceType: "desktop" },
options: {
// Here go the Calendar properties
}
})
});
return (
<div>
<Calendar id="calendar1" />
<Calendar id="calendar2" />
</div>
)
}dispose()
After calling this method, remove the DOM element associated with the UI component:
$("#myCalendar").dxCalendar("dispose");
$("#myCalendar").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-calendar ...
*ngIf="condition">
</dx-calendar>Vue
<template>
<DxCalendar ...
v-if="condition">
</DxCalendar>
</template>
<script>
import DxCalendar from 'devextreme-vue/calendar';
export default {
components: {
DxCalendar
}
}
</script>React
import React from 'react';
import Calendar from 'devextreme-react/calendar';
function DxCalendar(props) {
if (!props.shouldRender) {
return null;
}
return (
<Calendar ... >
</Calendar>
);
}
class App extends React.Component {
render() {
return (
<DxCalendar 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 Calendar instance found in an element with the myCalendar ID:
// Modular approach
import Calendar from "devextreme/ui/calendar";
...
let element = document.getElementById("myCalendar");
let instance = Calendar.getInstance(element) as Calendar;
// Non-modular approach
let element = document.getElementById("myCalendar");
let instance = DevExpress.ui.dxCalendar.getInstance(element);See Also
registerKeyHandler(key, handler)
A handler. Accepts the keydown event as the argument. It is a dxEvent 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.
See Also
If you have technical questions, please create a support ticket in the DevExpress Support Center.