form-validation | create validatable forms in elm | Form library

I am trying to test a customer validator but I keep getting this error 'Cannot read properties of undefined (reading 'dobLengthValidator')' I have been researching this but nothing seems to work. The validator checks if years in work is longer than date of birth, and if it is then it displays an error message. Also getting this error 'Error: Unexpected value 'DecoratorFactory' imported by the module 'DynamicTestModule'. Please add an @NgModule annotation.' Code bellow.

Spec file

I have a custom class McEditText that merges a constraint layout with a background xml drawable colored stroke.

(There's more to McEditText than Im showing here. The ellipses are the excluded code. So the problem is not the merge)

I'm a Back-end dev, and recently inherited a couple of legacy Apache Tapestry systems. My skills with Tapestry are null my knowledge on javascript medium.

I want to disable a submit button right before the submit is made to avoid multiple submits. A very simple

I've been beating my head trying to figure out why this parsing error keeps occuring.

Unexpected token [, expected identifier or keyword at column 13 in [zip.errors?.['required']]

I suspect the "?" is a query to the errors array looking for that key. My searches reveal nothing revealing about this "?" syntax. Typescript resources I've seen seem to assume I know how it's defined. I'm happy to be shown a pointer.

Thankfully, the code sample found on https://angular.io/guide/form-validation#validating-input-in-reactive-forms works so it doesn't seem like my Angular libraries are faulty. This is my most simple class and template after following the pattern of the working sample code.

donate.component.ts

I've been coding in angular, this is my first time working with material and form groups, and for the life of me I can't figure out how to add required validators. I've been following there https://angular.io/guide/form-validation, and I also tried https://material.angular.io/components/input/overview, But neither of them are working. Here's my code for the html file:

I'm currently creating a Registration-Page with two parts

• One part is about the Username and a Passwort.
• The second part is about choosing the own PC-Configuration

After defining everything, the User can register to get to the Main-Page.

Therefore I got a Model called "PC_Configuration" with a bunch of Foreign-Keys to the different Database-Models of the Processors/Graphicscards etc.:

everyone, do you know what wrong with this datepick ? I expect to see a calendar, not time picker.

I use bootstrap example file with the below link and script which are from youtube tutorial

I've tried many different ways to do this with both alert() and simple if-else statements, and even what is at this link: https://vuejs.org/v2/cookbook/form-validation.html

But nothing works! What am I doing wrong?

What is in my index.html:

I have - I think so - a very simple question. I'm working with Bootstrap 4.6 and I want to have a form-validation for my input.

I need to check if my input has a length of 5 or lower than the validation should be "not fullfiled" (red) otherwise if it's equal or higher than 5 it should be fullfiled, so it should be green.

red:

green:

I want to have that validation from Bootstrap 4.6 - here is the link to this component: https://getbootstrap.com/docs/4.6/components/forms/#validation

Thanks in advance for helping me out!

Here you can see my code: