#Angular Material - Error State Matcher for Form Fields (2021)

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In this advanced angular tutorial, we will have a look at ErrorStateMatcher - the interface which controls when to highlight the error state for angular material form fields. By default, angular material inputs turn red as soon as input has been touched but is it always the behavior we expect? I don't think so... that's why we have ErrorStateMatcher which gives us control over this behavior. It is going to be very interesting. Enjoy watching :)

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[DecodedFrontend]

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[wolfisraging]

I can't really stress enough how helpful your videos have been for me. Your free videos are 10x better than any of the paid courses I've taken so far.
Thanks for all of your hard work 💓.

[koraykural]

There is not much content about this topic. It was really helpful, thanks!

[rasenganxchidory]

You are incredible.
I'm from Brazil and one of my bugs in Jira was to resolve this problem of the error message being printed in the wrong situation.
You just helped me a lot and save a lot of my time.
Thanks!

[davesharman]

If try this by installing angular 16 and copy Dmytro's code in, you'll get an error:
Property 'name' comes from an index signature, so it must be accessed with ['Name']. Alternately for a quick fix you can go into your tsconfig.json file and change false, fom true to false.

Thanks Dmytro for another great video.

[bonnes]

It's very useful and helpful.... Thanks * 3000

[djb]

Wow, exactly what I was looking for. Excellent!! Thank you!

[Valdemar]

Very clear and useful! Thank you, and waiting for a new videos!

[bruno]

dude i was strugling last days with this, thank you for that!

[PaulliMr]

Hey, nice video! How do you test it though? is there a mock, you create one or you just provide it?

[Dinesh-irhq]

Thank you. When to use updateOn:blur. Can we use it in forms? which has input onBlur and form button onClick validation. In form onCIick the update:on blur not triggers. Input is an autocomplete and & called in form as an child selector.

[adamweber]

Is there any good practice for displaying error messages under input instead of ifing in every control?

[thodoris]

How would you tackle the case of a dynamic form? E.g. You wouldnt have hardcoded error messages but everything would come from an http request (validation rules, messages, field types etc.).

[bobby_tablez]

Great content!

Also cool to see you linking Maximilian's Udemy course for beginners.
Too often I see content creators only ever promoting their own content, which makes me question their overall judgement. Not the case here.

[mirciulicasm]

Hey Dmytro and thanks for your videos! I got a dilemma tho, how do you trigger the errors on form submit if it's needed to implement an MatFormFieldControl ?

[danilo_teixeira]

For some reason, that I didn't understand, the solution in the module level, didn't work for me.

[pashabolokhov]

You forgot to delete the instance of the CustomErrorStateMatcher that you created initially — you don't need it as you've done it via Dependency Injection