How to expand and collapse the parent node on the checkbox click in the JavaScript Dropdown Tree component?
Use the JavaScript Dropdown Tree component's nodeChecked event to expand and collapse the parent node on the checkbox click in the JavaScript Dropdown Tree component. Inside this event, you can use the expandAll and collapseAll methods.
[index.js]
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… // Initialize the Dropdown Tree component. var checkList = new ej.dropdowns.DropDownTree({ fields: { dataSource: dataSource.checkboxData, value: 'id', parentValue: 'pid', text: 'name', hasChildren: 'hasChild', }, showCheckBox: true, placeholder: 'Select items', popupHeight: '200px', mode: 'Delimiter', treeSettings:{autoCheck: true} }); checkList.appendTo('#ddtree'); //Define the nodeChecked function. checkList.treeObj.nodeChecked = function(args){ if( args.data[0].hasChildren && !args.data[0].expanded ){ checkList.treeObj.expandAll(args.data[0].id); } else if( args.data[0].hasChildren && args.data[0].expanded){ checkList.treeObj.collapseAll(args.data[0].id); } }; |
Refer to the following sample link:
I hope you enjoyed learning about how to expand and collapse the parent node on the checkbox click in the JavaScript Dropdown Tree component.
How to expand and collapse the parent node on the checkbox click in the JavaScript Dropdown Tree component
You can refer to our JavaScript Dropdown Tree feature tour feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications. You can also explore our JavaScript Dropdown example to understand how to create and manipulate data.
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