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Multiple Selection

The DropDownBox widget is an editor that consists of a text field and drop-down content. The content can be anything. In this demo, it is the TreeView widget and the DataGrid widget. This demo also illustrates how to implement multiple selection and how to synchronize the DropDownBox with the nested widgets.
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window.onload = function() { var treeView; var syncTreeViewSelection = function(treeView, value){ if (!treeView) return; if (!value) { treeView.unselectAll(); return; } value.forEach(function(key){ treeView.selectItem(key); }); }; var makeAsyncDataSource = function(jsonFile){ return new{ loadMode: "raw", key: "ID", load: function() { return $.getJSON("../../../../data/" + jsonFile); } }); }; var treeDataSource = makeAsyncDataSource("treeProducts.json"), gridDataSource = makeAsyncDataSource("customers.json"); var treeBoxOptions = { value: ko.observable(["1_1"]), valueExpr: "ID", displayExpr: "name", placeholder: "Select a value...", showClearButton: true, dataSource: treeDataSource, treeView: { dataSource: treeDataSource, dataStructure: "plain", keyExpr: "ID", parentIdExpr: "categoryId", selectionMode: "multiple", onContentReady: function(e) { treeView = e.component; syncTreeViewSelection(treeView, treeBoxOptions.value()); }, onItemSelectionChanged: function(args){ treeBoxOptions.value(args.component.getSelectedNodesKeys()); }, displayExpr: "name", selectByClick: true, selectNodesRecursive: false, showCheckBoxesMode: "normal" } }; var gridBoxValue = ko.observable([3]); var gridBoxOptions = { value: gridBoxValue, valueExpr: "ID", placeholder: "Select a value...", displayExpr: "CompanyName", showClearButton: true, dataSource: gridDataSource, dataGrid: { dataSource: gridDataSource, columns: ["CompanyName", "City", "Phone"], hoverStateEnabled: true, paging: { enabled: true, pageSize: 10 }, filterRow: { visible: true }, scrolling: { mode: "infinite" }, height: 265, selection: { mode: "multiple" }, selectedRowKeys: ko.computed(function(){ return gridBoxValue() || []; }), onSelectionChanged: function(selectedItems){ gridBoxValue(selectedItems.selectedRowKeys); } } }; ko.computed(function(){ syncTreeViewSelection(treeView, treeBoxOptions.value()); }); var viewModel = { treeBoxOptions: treeBoxOptions, gridBoxOptions: gridBoxOptions }; ko.applyBindings(viewModel, document.getElementById("dropdown-box-demo")); };
<!DOCTYPE html> <html xmlns=""> <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="js/jquery-3.1.0.min.js"></script> <script src=""></script> <link rel="stylesheet" type="text/css" href=""/> <link rel="stylesheet" type="text/css" href=""/> <link rel="dx-theme" data-theme="generic.light" href=""/> <link rel="dx-theme" data-theme="android5.light" href=""/> <link rel="dx-theme" data-theme="ios7.default" href=""/> <link rel="dx-theme" data-theme="" href=""/> <link rel="dx-theme" data-theme="win10.white" href=""/> <script src=""></script> <script src="data.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="dropdown-box-demo" class="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 data-bind="dxDropDownBox: treeBoxOptions"> <div data-options="dxTemplate: { name: 'content' }"> <div data-bind="dxTreeView: treeBoxOptions.treeView"></div> </div> </div> </div> </div> <div class="dx-field"> <div class="dx-field-label">DropDownBox with embedded DataGrid</div> <div class="dx-field-value"> <div data-bind="dxDropDownBox: gridBoxOptions"> <div data-options="dxTemplate: { name: 'content' }"> <div data-bind="dxDataGrid: gridBoxOptions.dataGrid"></div> </div> </div> </div> </div> </div> </div> </div> </body> </html>