# SearchDelegate An object or callback function the framework calls when performing a search or an autocomplete request. ``` type SearchDelegate< T extends SearchResponse | SearchAutocompleteResponse = | SearchResponse | SearchAutocompleteResponse, > = | { searchDidError: (error: Error) => void; searchDidComplete: (result: SearchResponse) => void; autocompleteDidError: (error: Error) => void; autocompleteDidComplete: (result: SearchAutocompleteResponse) => void; } | ((error: Error | null, result: T | null) => void); ``` ## Discussion You can also pass an object to the [`search(query, options)`](/documentation/MapKitJS/Search/search) and [`autocomplete(query, options)`](/documentation/MapKitJS/Search/autocomplete) methods instead of a search delegate callback function. A delegate object can include the following methods: - `searchDidComplete`. Upon successful completion of a search request, this method returns a data object that’s the same as the one that passes to the search callback function. - `searchDidError`. The system calls this when the search request fails. - `autocompleteDidComplete`. When an autocomplete request successfully completes, this method returns a `data` array that’s the same as the one that passes to the autocomplete callback function. - `autocompleteDidError`. The system invokes this when an autocomplete request fails. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)