Filtering in Code
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To filter Tree List nodes in code, utilize the following API:
TreeList.ActiveFilterString and TreeList.ActiveFilterCriteria
Allow you to specify a string filtering expression or a CriteriaOperator object. Read the following topic for detailed information and examples: Criteria Language Syntax.
Visibleproperty in event arguments to hide a node that does not match your custom filter criteria.
Addmethod of the TreeList.ActiveFilter property.
Add a new filter criteria that applies filtering by a specific Tree List column.
Enters a predefined automatic filtering row condition.
Disable the TreeListOptionsCustomization.AllowFilter option to prevent a user from applying and changing Tree List filters at runtime.
Turn off the TreeList.ActiveFilterEnabled setting to temporarily disable applied filters.
The example below ensures that Tree List records with the 15% discount are always visible, regardless of the currently applied filtering condition.