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Drop Down Box

Multiple Selection

If the widget embedded into the DropDownBox allows multiple selection, synchronize the DropDownBox value with the selected items. Synchronization instructions are the same for every selection mode.

In this demo, the DataGrid's selection.mode and TreeView's selectionMode options are used to enable multiple selection.

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$(function(){ var treeView, dataGrid; var syncTreeViewSelection = function(treeView, value){ if (!value) { treeView.unselectAll(); return; } value.forEach(function(key){ treeView.selectItem(key); }); }; var makeAsyncDataSource = function(jsonFile){ return new DevExpress.data.CustomStore({ loadMode: "raw", key: "ID", load: function() { return $.getJSON("../../../../data/" + jsonFile); } }); }; var getSelectedItemsKeys = function(items) { var result = []; items.forEach(function(item) { if(item.selected) { result.push(item.key); } if(item.items.length) { result = result.concat(getSelectedItemsKeys(item.items)); } }); return result; }; $("#treeBox").dxDropDownBox({ value: ["1_1"], valueExpr: "ID", displayExpr: "name", placeholder: "Select a value...", showClearButton: true, dataSource: makeAsyncDataSource("treeProducts.json"), contentTemplate: function(e){ var value = e.component.option("value"), $treeView = $("<div>").dxTreeView({ dataSource: e.component.option("dataSource"), dataStructure: "plain", keyExpr: "ID", parentIdExpr: "categoryId", selectionMode: "multiple", displayExpr: "name", selectByClick: true, onContentReady: function(args){ syncTreeViewSelection(args.component, value); }, selectNodesRecursive: false, showCheckBoxesMode: "normal", onItemSelectionChanged: function(args){ var nodes = args.component.getNodes(), value = getSelectedItemsKeys(nodes); e.component.option("value", value); } }); treeView = $treeView.dxTreeView("instance"); e.component.on("valueChanged", function(args){ var value = args.value; syncTreeViewSelection(treeView, value); }); return $treeView; } }); $("#gridBox").dxDropDownBox({ value: [3], valueExpr: "ID", placeholder: "Select a value...", displayExpr: "CompanyName", showClearButton: true, dataSource: makeAsyncDataSource("customers.json"), contentTemplate: function(e){ var value = e.component.option("value"), $dataGrid = $("<div>").dxDataGrid({ dataSource: e.component.option("dataSource"), columns: ["CompanyName", "City", "Phone"], hoverStateEnabled: true, paging: { enabled: true, pageSize: 10 }, filterRow: { visible: true }, scrolling: { mode: "infinite" }, height: 345, selection: { mode: "multiple" }, selectedRowKeys: value, onSelectionChanged: function(selectedItems){ var keys = selectedItems.selectedRowKeys; e.component.option("value", keys); } }); dataGrid = $dataGrid.dxDataGrid("instance"); e.component.on("valueChanged", function(args){ var value = args.value; dataGrid.selectRows(value, false); }); 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/3.4.1/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/19.2.3/css/dx.common.css"/> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.2.3/css/dx.light.css"/> <script src="https://cdn3.devexpress.com/jslib/19.2.3/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; }