Backend API
import React, { useCallback, useMemo, useState } from 'react';
import SelectBox from 'devextreme-react/select-box';
import { Template } from 'devextreme-react/core/template';
import {
products,
simpleProducts,
simpleProductLabel,
deferredProductLabel,
productLabel,
} from './data.ts';
import ImageIcon from './imageIcon.tsx';
import IndicatorIcon from './indicatorIcon.tsx';
import ConditionalIcon from './conditionalIcon.tsx';
import Item from './item.tsx';
function App() {
const [selectedItem, setSelectedItem] = useState(products[0]);
const [isLoaded, setIsLoaded] = useState(true);
const deferredProducts = useMemo<any>(
() => ({
loadMode: 'raw',
load: () => {
setIsLoaded(false);
const promise = new Promise((resolve) => {
setTimeout(() => {
resolve(simpleProducts);
setIsLoaded(true);
}, 3000);
});
return promise;
},
}),
[setIsLoaded],
);
const renderLoadIndicator = useCallback(
() => <IndicatorIcon isLoaded={isLoaded} />,
[isLoaded],
);
const renderConditionalIcon = useCallback(
() => <ConditionalIcon value={selectedItem} />,
[selectedItem],
);
const selectionChanged = useCallback((event: { selectedItem: any }) => {
setSelectedItem(event.selectedItem);
}, []);
return (
<div className="dx-fieldset">
<div className="dx-field">
<div className="dx-field-label">Image as the icon</div>
<div className="dx-field-value">
<SelectBox
dataSource={simpleProducts}
inputAttr={simpleProductLabel}
dropDownButtonRender={ImageIcon}
/>
</div>
</div>
<div className="dx-field">
<div className="dx-field-label">Load indicator as the icon</div>
<div className="dx-field-value">
<SelectBox
dataSource={deferredProducts}
inputAttr={deferredProductLabel}
dropDownButtonTemplate="loadIndicator"
>
<Template
name="loadIndicator"
render={renderLoadIndicator}
/>
</SelectBox>
</div>
</div>
<div className="dx-field">
<div className="dx-field-label">Value-dependent icon</div>
<div className="dx-field-value">
<SelectBox
dataSource={products}
defaultValue={products[0].ID}
selectedItem={selectedItem}
displayExpr="Name"
inputAttr={productLabel}
showClearButton={true}
valueExpr="ID"
itemRender={Item}
dropDownButtonTemplate="conditionalIcon"
onSelectionChanged={selectionChanged}
>
<Template
name="conditionalIcon"
render={renderConditionalIcon}
/>
</SelectBox>
</div>
</div>
</div>
);
}
export default App;
import React, { useCallback, useMemo, useState } from 'react';
import SelectBox from 'devextreme-react/select-box';
import { Template } from 'devextreme-react/core/template';
import {
products,
simpleProducts,
simpleProductLabel,
deferredProductLabel,
productLabel,
} from './data.js';
import ImageIcon from './imageIcon.js';
import IndicatorIcon from './indicatorIcon.js';
import ConditionalIcon from './conditionalIcon.js';
import Item from './item.js';
function App() {
const [selectedItem, setSelectedItem] = useState(products[0]);
const [isLoaded, setIsLoaded] = useState(true);
const deferredProducts = useMemo(
() => ({
loadMode: 'raw',
load: () => {
setIsLoaded(false);
const promise = new Promise((resolve) => {
setTimeout(() => {
resolve(simpleProducts);
setIsLoaded(true);
}, 3000);
});
return promise;
},
}),
[setIsLoaded],
);
const renderLoadIndicator = useCallback(() => <IndicatorIcon isLoaded={isLoaded} />, [isLoaded]);
const renderConditionalIcon = useCallback(
() => <ConditionalIcon value={selectedItem} />,
[selectedItem],
);
const selectionChanged = useCallback((event) => {
setSelectedItem(event.selectedItem);
}, []);
return (
<div className="dx-fieldset">
<div className="dx-field">
<div className="dx-field-label">Image as the icon</div>
<div className="dx-field-value">
<SelectBox
dataSource={simpleProducts}
inputAttr={simpleProductLabel}
dropDownButtonRender={ImageIcon}
/>
</div>
</div>
<div className="dx-field">
<div className="dx-field-label">Load indicator as the icon</div>
<div className="dx-field-value">
<SelectBox
dataSource={deferredProducts}
inputAttr={deferredProductLabel}
dropDownButtonTemplate="loadIndicator"
>
<Template
name="loadIndicator"
render={renderLoadIndicator}
/>
</SelectBox>
</div>
</div>
<div className="dx-field">
<div className="dx-field-label">Value-dependent icon</div>
<div className="dx-field-value">
<SelectBox
dataSource={products}
defaultValue={products[0].ID}
selectedItem={selectedItem}
displayExpr="Name"
inputAttr={productLabel}
showClearButton={true}
valueExpr="ID"
itemRender={Item}
dropDownButtonTemplate="conditionalIcon"
onSelectionChanged={selectionChanged}
>
<Template
name="conditionalIcon"
render={renderConditionalIcon}
/>
</SelectBox>
</div>
</div>
</div>
);
}
export default App;
import React from 'react';
interface ConditionalIconProps {
value: any;
}
export default function ConditionalIcon({ value }: ConditionalIconProps) {
if (value) {
return (
<img
alt="Custom icon"
src={`../../../../images/icons/${value.IconSrc}`}
className="custom-icon"
/>
);
}
return <div className="dx-dropdowneditor-icon"></div>;
}
import React from 'react';
export default function ImageIcon() {
return (
<img
alt="Custom icon"
src="../../../../images/icons/custom-dropbutton-icon.svg"
className="custom-icon"
/>
);
}
import React from 'react';
import LoadIndicator from 'devextreme-react/load-indicator';
interface IndicatorIconProps {
isLoaded: any;
}
export default function IndicatorIcon({ isLoaded }: IndicatorIconProps) {
return (
<span>
<LoadIndicator visible={!isLoaded} />
<span hidden={!isLoaded}>
<img
alt="Custom icon"
src="../../../../images/icons/custom-dropbutton-icon.svg"
className="custom-icon"
/>
</span>
</span>
);
}
import React from 'react';
interface ItemProps {
IconSrc: string;
Name: string;
}
export default function Item({ IconSrc, Name }: ItemProps) {
return (
<div className="custom-item">
<img
alt={Name}
src={`../../../../images/icons/${IconSrc}`}
/>
<div className="product-name">{Name}</div>
</div>
);
}
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.tsx';
ReactDOM.render(<App />, document.getElementById('app'));
export const simpleProducts = [
'HD Video Player',
'SuperHD Video Player',
'SuperPlasma 50',
'SuperLED 50',
'SuperLED 42',
];
export const products = [{
ID: 1,
Name: 'HD Video Player',
Price: 330,
Current_Inventory: 225,
Backorder: 0,
Manufacturing: 10,
Category: 'Video Players',
IconSrc: 'video-player.svg',
}, {
ID: 2,
Name: 'SuperHD Player',
Price: 400,
Current_Inventory: 150,
Backorder: 0,
Manufacturing: 25,
Category: 'Video Players',
IconSrc: 'video-player.svg',
}, {
ID: 3,
Name: 'SuperPlasma 50',
Price: 2400,
Current_Inventory: 0,
Backorder: 0,
Manufacturing: 0,
Category: 'Televisions',
IconSrc: 'tv.svg',
}, {
ID: 4,
Name: 'SuperLED 50',
Price: 1600,
Current_Inventory: 77,
Backorder: 0,
Manufacturing: 55,
Category: 'Televisions',
IconSrc: 'tv.svg',
}, {
ID: 5,
Name: 'SuperLED 42',
Price: 1450,
Current_Inventory: 445,
Backorder: 0,
Manufacturing: 0,
Category: 'Televisions',
IconSrc: 'tv.svg',
}];
export const simpleProductLabel = { 'aria-label': 'Simple Product' };
export const deferredProductLabel = { 'aria-label': 'Deferred Product' };
export const productLabel = { 'aria-label': 'Product' };
import React from 'react';
export default function ConditionalIcon({ value }) {
if (value) {
return (
<img
alt="Custom icon"
src={`../../../../images/icons/${value.IconSrc}`}
className="custom-icon"
/>
);
}
return <div className="dx-dropdowneditor-icon"></div>;
}
import React from 'react';
export default function ImageIcon() {
return (
<img
alt="Custom icon"
src="../../../../images/icons/custom-dropbutton-icon.svg"
className="custom-icon"
/>
);
}
import React from 'react';
import LoadIndicator from 'devextreme-react/load-indicator';
export default function IndicatorIcon({ isLoaded }) {
return (
<span>
<LoadIndicator visible={!isLoaded} />
<span hidden={!isLoaded}>
<img
alt="Custom icon"
src="../../../../images/icons/custom-dropbutton-icon.svg"
className="custom-icon"
/>
</span>
</span>
);
}
import React from 'react';
export default function Item({ IconSrc, Name }) {
return (
<div className="custom-item">
<img
alt={Name}
src={`../../../../images/icons/${IconSrc}`}
/>
<div className="product-name">{Name}</div>
</div>
);
}
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.js';
ReactDOM.render(<App />, document.getElementById('app'));
export const simpleProducts = [
'HD Video Player',
'SuperHD Video Player',
'SuperPlasma 50',
'SuperLED 50',
'SuperLED 42',
];
export const products = [
{
ID: 1,
Name: 'HD Video Player',
Price: 330,
Current_Inventory: 225,
Backorder: 0,
Manufacturing: 10,
Category: 'Video Players',
IconSrc: 'video-player.svg',
},
{
ID: 2,
Name: 'SuperHD Player',
Price: 400,
Current_Inventory: 150,
Backorder: 0,
Manufacturing: 25,
Category: 'Video Players',
IconSrc: 'video-player.svg',
},
{
ID: 3,
Name: 'SuperPlasma 50',
Price: 2400,
Current_Inventory: 0,
Backorder: 0,
Manufacturing: 0,
Category: 'Televisions',
IconSrc: 'tv.svg',
},
{
ID: 4,
Name: 'SuperLED 50',
Price: 1600,
Current_Inventory: 77,
Backorder: 0,
Manufacturing: 55,
Category: 'Televisions',
IconSrc: 'tv.svg',
},
{
ID: 5,
Name: 'SuperLED 42',
Price: 1450,
Current_Inventory: 445,
Backorder: 0,
Manufacturing: 0,
Category: 'Televisions',
IconSrc: 'tv.svg',
},
];
export const simpleProductLabel = { 'aria-label': 'Simple Product' };
export const deferredProductLabel = { 'aria-label': 'Deferred Product' };
export const productLabel = { 'aria-label': 'Product' };
<!DOCTYPE html>
<html lang="en">
<head>
<title>DevExtreme Demo</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=5.0" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/26.1.5/css/dx.light.css" />
<link rel="stylesheet" type="text/css" href="./bundle.css" />
</head>
<body class="dx-viewport">
<div class="demo-container">
<div id="app"></div>
</div>
<script src="bundles/vendor/react.vendor.js"></script>
<script src="./bundle.js"></script>
</body>
</html>
.dx-dropdowneditor-button .dx-button-content {
text-align: center;
}
.dx-dropdowneditor-button .dx-button-content .dx-loadindicator {
width: 1.5em;
height: 1.5em;
}
.custom-icon {
max-height: 100%;
max-width: 100%;
font-size: 28px;
display: inline-block;
vertical-align: middle;
}
.custom-item img {
float: right;
}
.custom-item .product-name {
line-height: 32px;
padding-left: 5px;
}