System Tree
The System Tree is used to browse and administer various server resources and devices.
Every tree node represents a server context (and may have sub-contexts under it). Contexts are loaded and displayed in batches in Iotellect instances with a large number of contexts.
 | Click here to check the difference between context tree visible in System Tree and real server context tree. |
Toolbar
System tree component has a separate toolbar that enables several operations:
Search of contexts by their descriptions
Select Multiple switch used for performing batch operations with many contexts at once (see Working with Multiple Nodes section below)
Context Menu
When you right-click a System Tree node, a context menu is shown. The context menu options are node-specific. These are actions defined in the Iotellect Server context corresponding to the current node. The action usually interacts with the user by executing different UI Procedures.
Menu item corresponding to the default action (i.e. action started upon double-click on a node) is highlighted in bold.
Working with Multiple Nodes
To select a range of nodes, click a node, hold down the Shift key and click another node. The two nodes, and all nodes in-between, will be selected. To select multiple nodes which are not in a single range (i.e, with unselected nodes in-between) hold down the Ctrl key and click the nodes you wish to select. If you right-click a selected node, you'll get a context menu with operations that are related to all selected nodes.
For more information on which actions appear in the context menu when several nodes are selected and how they behave, see action grouping.
Public Variables (Properties)
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Common Variables and Variable groups: Name, Advanced Properties, Container Properties, Styles, Preloader, Events, Bindings.
Root
Defines a root context of context tree displayed by the component.
Variable Name: | root |
Records: | 1 |
Record Format:
Field Name | Field Type | Field Description |
root | String | Root |
Selected Nodes
This property defines which tree nodes will be selected by default.
Variable Name: | selectedNodes |
Records: | 0..unlimited |
Record Format:
Field Name | Field Type | Field Description |
key | String | Key. The unique key of tree node to select. |
Expanded Nodes
This property defines which tree nodes will be expanded by default. Expanded node must have at least one child node.
Variable Name: | expandedNodes |
Records: | 0..unlimited |
Record Format:
Field Name | Field Type | Field Description |
key | String | Key. The unique key of tree node to expand. |
Validity Expression
Determines which nodes will be displayed in the system tree component, by calculating the Resource Validity for every context in the Iotellect System Tree. Every context with at least one valid child context within its children hierarchy will be displayed in the system tree component.
Variable Name: | validityExpression |
Records: | 1 |
Record Format:
Field Name | Field Type | Field Description |
validityExpression | String | Resource Validity Expression calculated for all contexts in the system tree. Must evaluate to a boolean value, indicating either:
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Component Location
Determines the location and size of new windows (components) opened through users interacting with the System Tree.
See Component Location for details on this property’s format and behavior.
Variable Name: | componentLocation |
Records: | 1 |
Record Format:
Field Name | Field Type | Field Description |
componentLocation | Data Table | Fields are defined in Component Location. |
Show Context Menu Shortcut
When enabled, a small icon appears when the user hovers over a node. Clicking the icon displays the context menu for the hovered node. This may make context actions more discoverable to users who may not initially think to right-click on a node.
When disabled, the context menu can only be opened by right-clicking on the target node.
Variable Name: | showContextMenuShortcut |
Records: | 1 |
Record Format:
Field Name | Field Type | Field Description |
showContextMenuShortcut | Boolean | Show Context Menu Shortcut |
Public Events
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Common Events: none
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