Angular Grid: Provided Filters
This section describes the functionality common to all filters that are provided by the grid.
Follow the links below to learn more about each specific filter:
The rest of this section will cover concepts that are common to every provided filter.
The diagram below outlines the structure of the filters. Each box represents a filter type with the functions listed in it. For example, all provided filters have button logic, but only the Date filter has a Date Comparator or a Date Picker.
Each provided filter is displayed in a UI with optional buttons at the bottom.
All of the provided filters have the following parameters:
Specifies the buttons to be shown in the filter, in the order they should be displayed in. The options are:
If the Apply button is present, the filter popup will be closed immediately when the Apply or Reset button is clicked if this is set to
By default the Text and Number filters will debounce by 500ms. This is because these filters have text field inputs, so time is given to the user to type items in before the input is formatted and the filtering applied. The Set and Date will execute immediately (no debounce). To override these defaults, set
This property is for when using the Client Side Row Model only. When set to
Provided Filters provide the following methods:
Returns a model representing the current state of the filter, or
Sets the state of the filter using the supplied model. Providing
Returns the filter model from the UI. If changes have been made to the UI but not yet applied, this model will reflect those changes.
Applies the model shown in the UI (so that
Each of the provided filters can optionally include Apply, Clear, Reset and Cancel buttons.
When the Apply button is used, the filter is only applied once the Apply button is pressed. This is useful if the filtering operation will take a long time because the dataset is large, or if using server-side filtering (thus preventing unnecessary calls to the server).
The Clear button clears just the filter UI, whereas the Reset button clears the filter UI and removes any active filters for that column.
The Cancel button will discard any changes that have been made in the UI, restoring the state of the filter to match the applied model.
The buttons will be displayed in the order they are specified in the
The example below demonstrates using the different buttons. It also demonstrates the relationship between the buttons and filter events. Note the following:
- The Athlete and Age columns have filters with Apply and Reset buttons, but different orders.
- The Country column has a filter with Apply and Clear buttons.
- The Year column has a filter with Apply and Cancel buttons.
- The Age and Year columns have
true, so the filter popup will be closed immediately when the filter is applied, reset or cancelled.
onFilterModifiedis called when the filter changes regardless of whether the Apply button is present.
onFilterChangedis called only after a new filter is applied.
- Looking at the console, it can be noted when a filter is changed, the result of
getModelFromUi()are different. The first reflects the active filter, while the second reflects what is in the UI (and not yet applied).
Provided filters maintain a separate model representing what is shown in the UI, which might change without having yet been applied, for example when an Apply button is present and the user has made changes in the UI but not yet clicked Apply. Calling
getModelFromUi() will always return a model representing the current UI, whereas
getModel() will return the applied model that is currently being used for filtering.
If any changes are made in the UI when the Apply button is active, or via other API methods whether the Apply button is active or not, you must call
filterInstance.applyModel() if you want to ensure the UI is applied.
Applying the model is then typically followed by calling
gridApi.onFilterChanged() to tell the grid to re-run the filtering.
// Get a reference to the 'name' filter instance const filterInstance = this.gridApi.getFilterInstance('name'); // Apply the model to ensure any changes in the UI or via API methods are recognised filterInstance.applyModel(); // Tell grid to run filter operation again this.gridApi.onFilterChanged();
If no call is made to
filterInstance.applyModel() then the filter UI will show any changes that have been made, but they won't be reflected in the filter model and therefore won't be reflected in the filtering. This will appear as if the user never hit the Apply button (regardless of whether the Apply button is active or not).