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Data Grid
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Columns
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Data Summaries
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Export to Excel
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Adaptability
- Keyboard Navigation
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Data Binding
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Features
-
Export to Excel
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Tree List
- Overview
-
Data Binding
- Sorting
- Paging
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- Node Drag & Drop
- Focused Row
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Filtering
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Column Customization
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- Adaptability
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Scheduler
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Views
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Features
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Customization
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React Scroll View
The ScrollView is a UI component that enables a user to scroll its content. This demo shows how to display the scrollbar within a container and how to update the ScrollView content.
To give you the ability to edit code on the fly, the demo uses SystemJS. For this reason, launching the demo takes some time. We strongly recommend that you do not use this approach in real projects.
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Backend API
x
import React, { useCallback, useRef, useState } from 'react';
import ScrollView, { ScrollViewTypes } from 'devextreme-react/scroll-view';
import SelectBox from 'devextreme-react/select-box';
import CheckBox, { CheckBoxTypes } from 'devextreme-react/check-box';
import service from './data.ts';
type UpdateContentArgs = ScrollViewTypes.PullDownEvent | ScrollViewTypes.ReachBottomEvent;
const showScrollBarModeLabel = { 'aria-label': 'Show Scrollbar Mode' };
let updateContentTimer;
const App = () => {
const [showScrollBarMode, setShowScrollBarMode] = useState<ScrollViewTypes.Properties['showScrollbar']>('onScroll');
const [pullDown, setPullDown] = useState(false);
const [scrollByContent, setScrollByContent] = useState(true);
const [scrollByThumb, setScrollByThumb] = useState(true);
const [content, setContent] = useState(service.getContent());
const scrollViewRef = useRef(null);
const updateContent = useCallback((args: UpdateContentArgs, eventName: string) => {
const updateContentText = `\n Content has been updated on the ${eventName} event.\n\n`;
if (updateContentTimer) {
clearTimeout(updateContentTimer);
}
updateContentTimer = setTimeout(() => {
setContent(eventName === 'PullDown' ? updateContentText + content : content + updateContentText);
args.component.release(false);
}, 500);
}, [content, setContent]);
const updateTopContent = useCallback((args: ScrollViewTypes.PullDownEvent) => {
updateContent(args, 'PullDown');
}, [updateContent]);
const updateBottomContent = useCallback((args: ScrollViewTypes.ReachBottomEvent) => {
updateContent(args, 'ReachBottom');
}, [updateContent]);
const pullDownValueChanged = useCallback((args: CheckBoxTypes.ValueChangedEvent) => {
setPullDown(args.value);
}, [setPullDown]);
const reachBottomValueChanged = useCallback((args: CheckBoxTypes.ValueChangedEvent) => {
scrollViewRef.current.instance().option('onReachBottom', args.value ? updateBottomContent : null);
}, [updateBottomContent]);
return (
<div id="scrollview-demo">
<ScrollView
id="scrollview"
ref={scrollViewRef}
reachBottomText="Updating..."
scrollByContent={scrollByContent}
bounceEnabled={pullDown}
onReachBottom={updateBottomContent}
onPullDown={updateTopContent}
showScrollbar={showScrollBarMode}
scrollByThumb={scrollByThumb}
>
<div className="text-content">{content}</div>
</ScrollView>
<div className="options">
<div className="caption">Options</div>
<div className="option">
<span>Show scrollbar: </span>
<SelectBox
items={showScrollbarModes}
valueExpr="value"
inputAttr={showScrollBarModeLabel}
displayExpr="text"
value={showScrollBarMode}
onValueChange={setShowScrollBarMode}
/>
</div>
<div className="option">
<CheckBox
text="Update content on the ReachBottom event"
defaultValue={true}
onValueChanged={reachBottomValueChanged}
/>
</div>
<div className="option">
<CheckBox
text="Update content on the PullDown event"
value={pullDown}
onValueChanged={pullDownValueChanged}
/>
</div>
<div className="option">
<CheckBox
text="Scroll by content"
value={scrollByContent}
onValueChange={setScrollByContent}
/>
</div>
<div className="option">
<CheckBox
text="Scroll by thumb"
value={scrollByThumb}
onValueChange={setScrollByThumb}
/>
</div>
</div>
</div>
);
};
const showScrollbarModes = [
{
text: 'On Scroll',
value: 'onScroll',
},
{
text: 'On Hover',
value: 'onHover',
},
{
text: 'Always',
value: 'always',
},
{
text: 'Never',
value: 'never',
},
];
export default App;
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