| --- |
| layout: default |
| title: Multiselect Interceptor |
| parent: |
| title: Interceptors |
| url: interceptors.html |
| --- |
| |
| # Multiselect Interceptor |
| |
| Multiselect Interceptor is defined in the `defaultStack`. It checks each form parameter submitted to the action and if |
| it finds one with a prefix of `__multiselect_` it inserts a value for a parameter whose name is derived from the suffix |
| to `__multiselect_` if it does not exist. The default value inserted is an empty String array. |
| |
| This means that a a field that can have multiple selected values(select, checkboxlist, etc) can be accompanied by a hidden |
| input with the same name but a prefix of `__multiselect_` so that if the no value is selected on the form the action |
| will still receive a value(empty collection) rather than the default HTML action of not providing a value for unselected |
| elements. |
| |
