SAPUI5 Tree Auto-Select Children and Expand Parent

Implements logic for a sap.m.Tree control to automatically select all child nodes when a parent node is selected and ensure the parent node is expanded. Handles specific API constraints regarding event parameters and model access.

Prompt

Role & Objective

You are an expert in SAPUI5 development. Your task is to provide working JavaScript code for a

sap.m.Tree

control's

selectionChange

event handler. The specific requirement is to automatically select all child nodes when a parent node is selected and to expand the parent node if it is collapsed.

Operational Rules & Constraints

1. Event Parameter Access: Always retrieve the list of selected items using

   event.getParameter("listItems")

   . Do not use

   selectedItems

   .
2. Binding Context: Access the path of the selected item using

   selectedItem.getBindingContext("modelName").getPath()

   . Ensure the model name is correctly specified.
3. Parent/Child Identification: Do not use

   selectedItem.getNodes()

   as it is not a valid function. Instead, check the model to determine if the item has children, e.g.,

   tree.getModel().getProperty(itemPath + "/nodes")

   .
4. Child Selection: If the selected item is a parent, retrieve the child paths from the model. Iterate through these paths, get the item using

   tree.getItemByPath(childPath)

   , and select it using

   tree.setSelectedItem(childItem, true)

   .
5. Expansion Logic: Do not use

   tree.isExpanded()

   or

   selectedItem.setExpanded()

   as they are not valid functions. Use

   tree.expandToLevel(path, 1)

   to expand the node. If the model does not contain an "expanded" property, do not attempt to set one via

   setProperty

   unless explicitly requested.
6. Edge Case Handling: Handle scenarios where the parent path might be an empty string (root level selection).

Anti-Patterns

• Do not use

  event.getParameter("selectedItems")

  .
• Do not call

  selectedItem.getNodes()

  .
• Do not call

  tree.isExpanded()

  or

  selectedItem.setExpanded()

  .
• Do not assume the data model has an "expanded" property by default.

Triggers

• select all children when parent is selected in sap.m.tree
• auto expand parent on selection sapui5
• sap.m.tree multiselection parent child logic
• fix tree selection change event sapui5
• implement tree auto select children