Hierarchy Browser (Tree) Component

Function

a!hierarchyBrowserFieldTree( label, labelPosition, instructions, helpTooltip, pathValue, pathSaveInto, nodeConfigs, nextLevelValues, accessibilityText, showWhen )

Displays hierarchical data in the form of drillable tree.

The Tree Browser Component allows users to vertically navigate hierarchical business objects, each presented as a node with a large image, three lines of metadata, and an optional link.

Parameters

Usage considerations

Hierarchy browsers overview

The hierarchy browser tree is a generalized version of the org chart in the same way that the custom picker is a generalized version of the user and group pickers. The designer has control over what data is shown, how it is retrieved, and how it is displayed, making the component a flexible means of presenting hierarchical business data to users.

For more information on how the hierarchy browser tree works, see the detailed explanation.

Using the pathValue and nodeConfigs parameters

• If a pathValue is not specified, only the label, tooltip, and instructions will display.
• All nodes, including non-drillable nodes, can be clicked and saved to the pathValue. Non-drillable nodes do not, however, show as having any values in the next level.
• Each value in the pathValue past the first must be included in the Next Level Values generated by the previous value in the pathValue. For example, if Navigation Path is {1, 10, 100}, then 10 must be present in the nextLevelValues generated by 1 and 100 in the nextLevelValues generated by 10.
• The function variable fv!nodeValue is available when configuring the hierarchy browser tree. It is only available in the nodeConfigs and nextLevelValues parameters.

Examples

To experiment with examples, copy and paste the expression into an interface object.

Tree browser

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a!localVariables(
  local!path: {
    {
      id: 6,
      name: "Node 6",
      description:"Description for node 6",
      details: "I have 6 child nodes",
      type: "AIRPLANE",
      numberOfChildren: 6,
      isDrillable: true
    }
  },
  a!hierarchyBrowserFieldTree(
    nodeConfigs: a!hierarchyBrowserFieldTreeNode(
      id: fv!nodeValue.id,
      label: fv!nodeValue.name,
      description: fv!nodeValue.description,
      details: fv!nodeValue.details,
      image: a!documentImage(
        document: if(
          fv!nodeValue.type = "AIRPLANE",
          a!iconNewsEvent("PAPER_AIRPLANE"),
          a!iconNewsEvent("FOUNTAIN_PEN")
        )
      ),
      nextLevelCount: fv!nodeValue.numberOfChildren,
      isDrillable: fv!nodeValue.isDrillable
    ),
    pathValue: local!path,
    pathSaveInto: local!path,
    nextLevelValues: a!foreach(
      /* Make a number of values in the next level equal to the number of children */
      enumerate(fv!nodeValue.numberOfChildren),
      a!localVariables(
        /* Give the new node a random number of children between 0 and 10 */
        local!numberOfChilren: tointeger(rand() * 10),
        /* Make only even nodes drillable */
        local!isDrillable: mod(fv!item, 2) = 0,
        {
          id: fv!item,
          name: "Node " & fv!item,
          description: "Description for node " & fv!item,
          details: if(
            local!isDrillable,
            if(
              local!numberOfChilren = 1,
              "I have 1 child node",
              "I have " & local!numberOfChilren & " child nodes"
            ),
            "I am not drillable"
          ),
          type: if(
            fv!nodeValue.type = "AIRPLANE",
            "FOUNTAIN_PEN",
            "AIRPLANE"
          ),
          numberOfChildren: local!numberOfChilren,
          isDrillable: local!isDrillable
        }
      )
    )
  )
)

Hierarchy browser tree example breakdown and explanation

If you want more information on how the hierarchy browser tree's inputs produce the rendered component, read through this section. This section provides a step-by-step breakdown of how the values provided to the component generate the component's data and guide its display. The interface in this section can be created by clicking EXPRESSION and pasting the following expression into the Interface Definition.

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a!localVariables(
  local!path: {5,2},
  a!hierarchyBrowserFieldTree(
    nodeConfigs: a!hierarchyBrowserFieldTreeNode(
      id: fv!nodeValue,
      label: "Node" & fv!nodeValue,
      description: "Description for node " & fv!nodeValue,
      details: "Details for node " & fv!nodeValue,
      image: a!documentImage(document: a!iconIndicator("PREVIEW")),
      nextLevelCount: fv!nodeValue
    ),
    pathValue: local!path,
    pathSaveInto: local!path,
    nextLevelValues: enumerate(fv!nodeValue)
  )
)

To configure the tree browser details:

1. The first step in building the browser is generating the "trunk" of the tree, or path nodes. You provide these values to the component through pathValue.
2. Next, the component must know how to display these values as nodes. The component gets the display information from nodeConfigs.
   • As the purple text (number two) shows, the display information for the path nodes comes from evaluating nodeConfigs for each value in pathValue. Each evaluation of nodeConfigs needs to produce a hierarchy browser tree node. In this example, the first value in pathValue is 5. Therefore, the first node, or the root, comes from evaluating nodeConfigs with fv!nodeValue set to 5.
3. The component creates a level of nodes for each node in pathValue.</li>
   • The orange text (number three) shows that the second and third levels' values are generated by evaluating nextLevelValues for the first and second values in pathValue, respectively. In this example, the first value in pathValue is 5. The component uses this value to generate the second level's values by evaluating nextColumnValues with fv!nodeValue set to 5. The evaluation produced 5 values: 0, 1, 2, 3, 4.
4. Finally, the component determines how to display the values produced in step three as nodes using nodeConfigs.
   • The green text (number four) shows that the component evaluates nodeConfigs for each value generated by nextLevelValues.

Feature compatibility

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