Single Selection
The DropDownBox component consists of a text field and drop-down content. In this demo, the content is the TreeView and the DataGrid in single selection mode.
The following instructions show how to synchronize the DropDownBox with an embedded DevExtreme component:
-
Specify data sources
The DropDownBox and its embedded component can use the same or different data sources. If the data sources are different, you need to specify the embedded component's key field in the DropDownBox's data source. If the DropDownBox contains a DataGrid, bind the DataGrid to a store instead of a simple array (for example, an ArrayStore). -
Specify which data field contains the DropDownBox's values and the embedded component's keys
Assign the field's name to the DropDownBox's valueExpr property and to the key property of the embedded component's store. -
Synchronize the DropDownBox's value and the embedded component's selection
- Assign DropDownBox's initial value to the embedded component's selectedRowKeys/selectedItemKeys property (see the example with the DataGrid below). If the embedded component does not have such properties, implement the onContentReady handler (the example with the TreeView).
- Implement the DropDownBox's onValueChanged handler to update the selection when the value changes.
- Implement the embedded component's onSelectionChanged handler to update the DropDownBox's value when the selection changes.
Feel free to share demo-related thoughts here.
If you have technical questions, please create a support ticket in the DevExpress Support Center.
If you have technical questions, please create a support ticket in the DevExpress Support Center.
Thank you!
We appreciate your feedback.
We appreciate your feedback.
$(() => {
let treeView; let
dataGrid;
const syncTreeViewSelection = function (treeViewInstance, value) {
if (!value) {
treeViewInstance.unselectAll();
} else {
treeViewInstance.selectItem(value);
}
};
const makeAsyncDataSource = function (jsonFile) {
return new DevExpress.data.CustomStore({
loadMode: 'raw',
key: 'ID',
load() {
return $.getJSON(`../../../../data/${jsonFile}`);
},
});
};
$('#treeBox').dxDropDownBox({
value: '1_1',
valueExpr: 'ID',
displayExpr: 'name',
placeholder: 'Select a value...',
showClearButton: true,
dataSource: makeAsyncDataSource('treeProducts.json'),
contentTemplate(e) {
const $treeView = $('<div>').dxTreeView({
dataSource: e.component.getDataSource(),
dataStructure: 'plain',
keyExpr: 'ID',
parentIdExpr: 'categoryId',
selectionMode: 'single',
displayExpr: 'name',
selectByClick: true,
onContentReady(args) {
const value = e.component.option('value');
syncTreeViewSelection(args.component, value);
},
selectNodesRecursive: false,
onItemSelectionChanged(args) {
const selectedKeys = args.component.getSelectedNodeKeys();
e.component.option('value', selectedKeys);
},
});
treeView = $treeView.dxTreeView('instance');
e.component.on('valueChanged', (args) => {
syncTreeViewSelection(treeView, args.value);
e.component.close();
});
return $treeView;
},
});
$('#gridBox').dxDropDownBox({
value: 3,
valueExpr: 'ID',
deferRendering: false,
placeholder: 'Select a value...',
displayExpr(item) {
return item && `${item.CompanyName} <${item.Phone}>`;
},
showClearButton: true,
dataSource: makeAsyncDataSource('customers.json'),
contentTemplate(e) {
const value = e.component.option('value');
const $dataGrid = $('<div>').dxDataGrid({
dataSource: e.component.getDataSource(),
columns: ['CompanyName', 'City', 'Phone'],
hoverStateEnabled: true,
paging: { enabled: true, pageSize: 10 },
filterRow: { visible: true },
scrolling: { mode: 'virtual' },
selection: { mode: 'single' },
selectedRowKeys: [value],
height: '100%',
onSelectionChanged(selectedItems) {
const keys = selectedItems.selectedRowKeys;
const hasSelection = keys.length;
e.component.option('value', hasSelection ? keys[0] : null);
},
});
dataGrid = $dataGrid.dxDataGrid('instance');
e.component.on('valueChanged', (args) => {
dataGrid.selectRows(args.value, false);
e.component.close();
});
return $dataGrid;
},
});
});
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<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=1.0" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>window.jQuery || document.write(decodeURIComponent('%3Cscript src="js/jquery.min.js"%3E%3C/script%3E'))</script>
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/22.2.6/css/dx.light.css" />
<script src="https://cdn3.devexpress.com/jslib/22.2.6/js/dx.all.js"></script>
<link rel="stylesheet" type="text/css" href="styles.css" />
<script src="index.js"></script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<div id="form">
<div class="dx-fieldset">
<div class="dx-field">
<div class="dx-field-label">DropDownBox with embedded TreeView</div>
<div class="dx-field-value">
<div id="treeBox"></div>
</div>
</div>
<div class="dx-field">
<div class="dx-field-label">DropDownBox with embedded DataGrid</div>
<div class="dx-field-value">
<div id="gridBox"></div>
</div>
</div>
</div>
</div>
</div>
</body>
</html>
#form .dx-fieldset {
height: 500px;
}
[{
"ID": 1,
"CompanyName": "Premier Buy",
"Address": "7601 Penn Avenue South",
"City": "Richfield",
"State": "Minnesota",
"Zipcode": 55423,
"Phone": "(612) 291-1000",
"Fax": "(612) 291-2001",
"Website": "http://www.nowebsitepremierbuy.com"
}, {
"ID": 2,
"CompanyName": "ElectrixMax",
"Address": "263 Shuman Blvd",
"City": "Naperville",
"State": "Illinois",
"Zipcode": 60563,
"Phone": "(630) 438-7800",
"Fax": "(630) 438-7801",
"Website": "http://www.nowebsiteelectrixmax.com"
}, {
"ID": 3,
"CompanyName": "Video Emporium",
"Address": "1201 Elm Street",
"City": "Dallas",
"State": "Texas",
"Zipcode": 75270,
"Phone": "(214) 854-3000",
"Fax": "(214) 854-3001",
"Website": "http://www.nowebsitevideoemporium.com"
}, {
"ID": 4,
"CompanyName": "Screen Shop",
"Address": "1000 Lowes Blvd",
"City": "Mooresville",
"State": "North Carolina",
"Zipcode": 28117,
"Phone": "(800) 445-6937",
"Fax": "(800) 445-6938",
"Website": "http://www.nowebsitescreenshop.com"
}, {
"ID": 5,
"CompanyName": "Braeburn",
"Address": "1 Infinite Loop",
"City": "Cupertino",
"State": "California",
"Zipcode": 95014,
"Phone": "(408) 996-1010",
"Fax": "(408) 996-1012",
"Website": "http://www.nowebsitebraeburn.com"
}, {
"ID": 6,
"CompanyName": "PriceCo",
"Address": "30 Hunter Lane",
"City": "Camp Hill",
"State": "Pennsylvania",
"Zipcode": 17011,
"Phone": "(717) 761-2633",
"Fax": "(717) 761-2334",
"Website": "http://www.nowebsitepriceco.com"
}, {
"ID": 7,
"CompanyName": "Ultimate Gadget",
"Address": "1557 Watson Blvd",
"City": "Warner Robbins",
"State": "Georgia",
"Zipcode": 31093,
"Phone": "(995) 623-6785",
"Fax": "(995) 623-6786",
"Website": "http://www.nowebsiteultimategadget.com"
}, {
"ID": 8,
"CompanyName": "EZ Stop",
"Address": "618 Michillinda Ave.",
"City": "Arcadia",
"State": "California",
"Zipcode": 91007,
"Phone": "(626) 265-8632",
"Fax": "(626) 265-8633",
"Website": "http://www.nowebsiteezstop.com"
}, {
"ID": 9,
"CompanyName": "Clicker",
"Address": "1100 W. Artesia Blvd.",
"City": "Compton",
"State": "California",
"Zipcode": 90220,
"Phone": "(310) 884-9000",
"Fax": "(310) 884-9001",
"Website": "http://www.nowebsiteclicker.com"
}, {
"ID": 10,
"CompanyName": "Store of America",
"Address": "2401 Utah Ave. South",
"City": "Seattle",
"State": "Washington",
"Zipcode": 98134,
"Phone": "(206) 447-1575",
"Fax": "(206) 447-1576",
"Website": "http://www.nowebsiteamerica.com"
}, {
"ID": 11,
"CompanyName": "Zone Toys",
"Address": "1945 S Cienega Boulevard",
"City": "Los Angeles",
"State": "California",
"Zipcode": 90034,
"Phone": "(310) 237-5642",
"Fax": "(310) 237-5643",
"Website": "http://www.nowebsitezonetoys.com"
}, {
"ID": 12,
"CompanyName": "ACME",
"Address": "2525 E El Segundo Blvd",
"City": "El Segundo",
"State": "California",
"Zipcode": 90245,
"Phone": "(310) 536-0611",
"Fax": "(310) 536-0612",
"Website": "http://www.nowebsiteacme.com"
}]
[
{
"ID": 1,
"name": "Stores",
"expanded": true
},
{
"ID": "1_1",
"categoryId": 1,
"name": "Super Mart of the West",
"expanded": true
},
{
"ID": "1_1_1",
"categoryId": "1_1",
"name": "Video Players"
},
{
"ID": "1_1_1_1",
"categoryId": "1_1_1",
"name": "HD Video Player",
"price": 220
},
{
"ID": "1_1_1_2",
"categoryId": "1_1_1",
"name": "SuperHD Video Player",
"price": 270
},
{
"ID": "1_1_2",
"categoryId": "1_1",
"name": "Televisions",
"expanded": true
},
{
"ID": "1_1_2_1",
"categoryId": "1_1_2",
"name": "SuperLCD 42",
"price": 1200
},
{
"ID": "1_1_2_2",
"categoryId": "1_1_2",
"name": "SuperLED 42",
"price": 1450
},
{
"ID": "1_1_2_3",
"categoryId": "1_1_2",
"name": "SuperLED 50",
"price": 1600
},
{
"ID": "1_1_2_4",
"categoryId": "1_1_2",
"name": "SuperLCD 55",
"price": 1750
},
{
"ID": "1_1_2_5",
"categoryId": "1_1_2",
"name": "SuperLCD 70",
"price": 4000
},
{
"ID": "1_1_3",
"categoryId": "1_1",
"name": "Monitors"
},
{
"ID": "1_1_3_1",
"categoryId": "1_1_3",
"name": "19\""
},
{
"ID": "1_1_3_1_1",
"categoryId": "1_1_3_1",
"name": "DesktopLCD 19",
"price": 160
},
{
"ID": "1_1_4",
"categoryId": "1_1",
"name": "Projectors"
},
{
"ID": "1_1_4_1",
"categoryId": "1_1_4",
"name": "Projector Plus",
"price": 550
},
{
"ID": "1_1_4_2",
"categoryId": "1_1_4",
"name": "Projector PlusHD",
"price": 750
}
]