This function takes two parameters: the parent node and a callback function to be invoked when the data becomes available.
Set the TreeView's lazyLoadFunction property to a function to be called when the user expands the node.Set the items property in the parent node data item to an empty array.Only two steps are required to implement lazy loading with Wijmo TreeView: You don't have to set any properties on the control. If the element hosting the tree has the 'dir' attribute set to 'rtl', the tree will render with nodes extending from right to left. The TreeView supports this automatically. Setting 'dir' to 'rtl' on any element causes the element's content to flow from right to left. HTML accommodates this with the 'dir' attribute. Some languages render content from the right to the left of the page (Arabic and Hebrew are typical examples). To allow dragging and dropping nodes between different TreeView controls, you must handle the dragOver event and set the cancel parameter to false if the move is valid. Setting the allowDragging property to true allows users to drag and drop nodes within the same TreeView. The event handler parameters include the element that represents the node and the data item being rendered. You can customize the content of the TreeView nodes using the formatItem event. Disabled Nodesĭisabled nodes can't be selected using the mouse or keyboard. Use the imageMemberPath property to add images to nodes by specifying the name of a property on the data items that contains an image URL. When checkboxes are displayed, the TreeView manages their hierarchy so that when a checkbox is checked or cleared, the new value is automatically applied to all child nodes, and reflected on the state of the parent nodes. Accordions are multi-pane panels that keep only one panel expanded at a time. Accordion TreesĬreate a TreeView with multi-pane panels to use for navigation. The TreeView's hierarchical structure and auto-search functionality make it easy for users to drill-down and find the items they are interested in. Navigation trees are the simplest and most commonly created TreeView controls. The TreeView's hierarchical structure and auto-search functionality make it easy for users to drill down and find the items they are interested in. TreeView Benefits Display Hierarchical Data Includes first-class Angular, React, and Vue.js support.Easily style the TreeView to match your application's look and feel.The Fastest, Most Flexible JavaScript TreeView Control
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