Angular Reactive Forms - All Needed Use Cases

Learn Angular reactive forms which is the most popular way to bind forms to your application. Additionally we will implement client validation, rendering error messages and reacting on fields change in RxJS way.
TIMESTAMPS
0:00 Introduction
1:04 Reactive forms configuration
1:27 Creating a reactive form
5:07 Reactive forms client validation
6:59 Rendering error fields
10:26 Rendering error messages
11:42 Bonus
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[@lgtm-drawing]

I really appreciate your content. Every concept you explain is clear and easy to understand.

[@MonsterlessonsAcademy]

Glad to hear that!

[@yudianantha4549]

Best Angular explanation i've seen in a long time. Short, but easy to understand & deadly accurate to the point !!

[@MonsterlessonsAcademy]

Glad it was helpful!

[@user-lb6en7nn3z]

Very easy to understand, great tutorial !!

[@MonsterlessonsAcademy]

Glad to hear that!

[@ahmedm_seada]

Way simple explanation. Subscribed.

[@MonsterlessonsAcademy]

Welcome aboard!

[@Vittokm]

Very well explained, thanks!

[@MonsterlessonsAcademy]

Glad it was helpful!

[@user-zc5le6if2f]

Amazing explanations man...really love your content.

[@MonsterlessonsAcademy]

Glad you like them!

[@jardagalvao]

Amazing content man. I understand very well with your explication

[@MonsterlessonsAcademy]

Glad to hear it!

[@newuser3029]

Very helpful and concise and precise

[@MonsterlessonsAcademy]

Glad you think so!

[@ishep123]

this is amazing! thank you VERY much!!!

[@MonsterlessonsAcademy]

You're very welcome!

[@donskanone]

Thanks a lot for your efforts and great videos 🙏 Very useful

[@MonsterlessonsAcademy]

Glad to hear that!

[@user-hd8dm5ur3i]

Great video! What about 'array' and fields that can be added dynamically? Do you planning to create video to cover this part of Reactive Forms? Also, it would be great to hear about 'setValue' and 'patchValue'. Maybe some more advanced parts of this amazing topic.

[@MonsterlessonsAcademy]

I will add it as an idea for future videos. thank you!

[@davebudah]

Been using reactive forms but with half the knowledge as to why I did some of the staff. Thanks.

[@MonsterlessonsAcademy]

Glad to help!

[@dinysanchez]

Wow, just as I am building a Reactive Form as we speak! It is like you are a mind reader! Thank you! I'm struggling w/ valueChanges. How do I use valuechanges w/o subscribing?

[@MonsterlessonsAcademy]

Just thought you need that :) You use valueChanges just like a normal stream - you can subscribe, combine, etc

[@venup6390]

Clear, Crispy

[@MonsterlessonsAcademy]

Thanks!

[@AbhishekKumar-ez8qn]

can you please tell me the theme you use and your list of vs code extension for better productivity

[@MonsterlessonsAcademy]

The theme is gruvbox. I'm not using vs code but vim here is a video th-cam.com/video/YrLiugDhCuk/w-d-xo.html

[@m77sc]

how do you hide the error when you complete the field correctly? I mean when click the button submitted is true, so when you complete the field correctly it will show the red border and the message error

[@MonsterlessonsAcademy]

You can reset submitted to false after any field change

[@DragosP-cx7sk]

great

[@MonsterlessonsAcademy]

Thank you!

[@GeorgeWood01]

Thank u for the video. My thoughts: 1) hardcoding a certain error message in the template doesn't seem to be a flexible approach. 2) tracking by yourself whether the form is submitted inside the component also doesn't seem right. Doesn't FormGroup instance provide this information? If not, what a shame.

[@GeorgeWood01]

Ok, may be there was no other choice. Angular just provides errors like {required: true} or {minlength: {actuallength: ..., ... }}. What an ugly design omg.

[@MonsterlessonsAcademy]

No Angular doesn't provide the info if the form is already submitted

[@EvilazioVFX]

The angular already handle classes to the inputs like ng-dirty, ng-touched or ng-invalid.

[@MonsterlessonsAcademy]

Yeap

[@MrBan001]

How to make all formControls inside a form required?

[@MonsterlessonsAcademy]

registerForm = this.fb.group({
username: ['', Validators.required],
password: ['', Validators.required],
email: ['', [Validators.required, Validators.email]],
roleId: [1, Validators.required],
});

[@MrBan001]

@@MonsterlessonsAcademy I have a form with about 150 form controls this seem not very efficient

[@028-manikandan3]

Bro please put angular animation different videos

[@MonsterlessonsAcademy]

It is already there th-cam.com/video/8BatUQYtMlY/w-d-xo.html

[@028-manikandan3]

This video I already watched bro.but i doubt this animation only there in angular? .then i see your video you write code http services.so angular crud operation please put bro 🙏🙏

[@andreiarpenti2589]

Shouldn't we unsubscribe from valueChanges?

[@MonsterlessonsAcademy]

Usually it's a good practice to imperatively unsubscribe if you imperatively subscribed. It can also be that garbage collection does not immediately dispose of the component instance and then it might still receive some events util it's finally gone. The subscribe callbacks might cause errors when the component is not alive anymore or might cause expensive operations (network request) that are not necessary anymore when the component is disposed.

[@yeromin_g]

под пиво пойдет

[@godof5od393]

Почему видеоролики не на русском??(это не претензия кстати но мне интересно почему, думаю если бы они были на русском ты бы собирал очень много просмотров так как контент реально годный и на русскоязычном ютубе очень мало такого)

[@MonsterlessonsAcademy]

Потому что в росии заблокированы платежные системы и никто не может покупать мои курсы например.

[@imarryday]

На русском ниша инфоциганства занята Владиленом.

[@LukeAvedon]

Wait. I thought you retired because of ChatGPT?

[@MonsterlessonsAcademy]

Yeap, I'm on my farm now.

[@davebudah]

@@MonsterlessonsAcademy hahaha

[@yeromin_g]

yo what

[@imarryday]

This is very basic use, doesn’t cover 10%