Defines a value filter for a column on a FlexSheet control.
Value filters contain an explicit list of values that should be displayed by the sheet.
constructor(column: Column): FlexSheetValueFilter
Initializes a new instance of the FlexSheetValueFilter class.
The column to filter.
Gets or sets the DataMap used to convert raw values into display values shown when editing this filter.
Gets or sets a value that determines whether the filter should include only values selected by the filterText property.
The default value for this property is **true**, which matches Excel's behavior.
Set it to **false** to disable this behavior, so searching only affects which items are displayed on the list and not which items are included in the filter.
Gets or sets a string used to filter the list of display values.
Gets a value that indicates whether the filter is active.
The filter is active if some values are selected and some are not. If all values are in the same state (either selected or un-selected), then the filter is not active.
Gets or sets the maximum number of elements on the list of display values.
Adding too many items to the list makes searching difficult and hurts performance. This property limits the number of items displayed at any time, but users can still use the search box to filter the items they are interested in.
The default value for this property is **250**.
This code changes the value to 1,000,000, effectively listing all unique values for the field:
```typescript import { FlexGridFilter} from '@grapecity/wijmo.grid.filter';
// change the maxItems property for the 'id' column: let f = new FlexGridFilter(theGrid); f.getColumnFilter('id').valueFilter.maxValues = 1000000; ```
Gets or sets an object with the selected (checked) values on the value list.
If the filter is not active, this property is set to null and all values present in the data source are shown on the list.
If the filter is active (the user selected some values from the list but not all), the showValues property is set to an object whose property names are the display values of the selected values.
For example, if the value list contains country names and the user selected "US" and "Japan", the showValues property returns:
```javascript { Japan: true, US: true } ```
Gets or sets a value that determines whether the values should be sorted when displayed in the editor.
This property is especially useful when you are using the uniqueValues to provide a custom list of values property and you would like to preserve the order of the values.
Gets or sets an array containing the unique values to be displayed on the list.
If this property is set to null, the list will be filled based on the grid data.
Explicitly assigning the list of unique values is more efficient than building the list from the data, and is required for value filters to work properly when the data is filtered on the server (because in this case some values might not be present on the client so the list will be incomplete).
By default, the filter editor will sort the unique values when displaying them to the user. If you want to prevent that and show the values in the order you provided, set the sortValues property to false.
For example, the code below provides a list of countries to be used in the ValueFilter for the column bound to the 'country' field:
```typescript import { FlexGridFilter} from '@grapecity/wijmo.grid.filter';
// create filter for a FlexGrid let filter = new FlexGridFilter(grid);
// assign list of unique values to country filter let cf = filter.getColumnFilter('country'); cf.valueFilter.uniqueValues = ['Austria', 'Belgium', 'Chile', 'Denmark']; ```
apply(value): boolean
Gets a value that indicates whether a value passes the filter.
The value to test.
getUniqueValues(filtered?: boolean): any[]
Gets an array containing objects that represent all unique values for this column.
The objects in the array returned contain two properties: *value* (the data value) and *text* (the formatted data value).
If the uniqueValues property is set to an array of values, that array is used as a data source.
If uniqueValues is null, the method scans all items in the data source and returns an creates an array containing all unique values.
This method is used by the ValueFilterEditor class to populate the list of values shown to users.
Whether to apply all other filters when retrieving the values from the data source.
implementsInterface(interfaceName: string): boolean
Returns true if this object supports a given interface.
Name of the interface to look for.
