Steps to link two mat-autocomplete components based on the input change of one another

After reviewing the content on the official document at https://material.angular.io/components/autocomplete/examples

I have implemented Autocomplete in my code based on the example provided. However, I need additional functionality beyond simple integration. For instance, I need to implement autocomplete for country, state, and city, where selecting a country will dynamically change the options available for states, and selecting a state will do the same for cities.

Another concern I have is related to scalability - if my page contains multiple autocomplete fields, would I need to individually create filter functions for each one? Ideally, I would like to develop a generic solution that can be applied to all autocomplete components.

Your suggestions on how to approach these challenges would be greatly appreciated. Thank you.

javascriptangulartypescriptangular-materialangular6

Answer №1

To implement country-specific subscriptions, you can utilize Subject subscriptions. Begin by creating a Subject for the country, such as 

country$ = new Subject<Country>();
Next, subscribe to changes in the country$ Subject and once a country is selected from an autocomplete dropdown, trigger the change using $country.next(chosenCountry). This will allow you to manipulate or filter the array of states based on the chosen country. Feel free to reach out if you have any questions.

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