Manipulating, modifying, and verifying distinct information rather than inputting to / retrieving from the model through the use of Reactive Forms

My configuration

I am retrieving a value from the database as a number. This value must always be a number, except when displaying it in an input element and validating user input. In those cases, the number needs to be a HEX value.

Here is the desired process:

  1. value: 200 is fetched from the service.
  2. ?value=200 is used as a parameter in the router.
  3. value: 'c8' is shown in the input[type=text] on the interface.
  4. The user edits this value to fa
  5. The validator should validate fa to ensure it's a valid HEX expression.
  6. If valid, value = hex2Number('fa') will result in value: 250 in the model, while still displaying fa in the input for editing.
  7. value: 250 will then be utilized in the router and sent back to the server.

This same scenario applies to other data types like minutes:seconds being edited and seconds stored in the DB.

I do not need assistance with the hex2Number() method ;-)

My queries

  1. Can this be achieved using Reactive Forms?
  2. ... or would I need to switch to Template Driven Forms?
  3. Is there a recommended approach for managing different data between the GUI and underlying model?

Thank you in advance!

angularformstypescriptarchitecture

Answer №1

1) Absolutely, achieving this is feasible. Develop a personalized ControlValueAccessor for the task.

2) This solution works seamlessly with Reactive forms as well as Template driven forms.

3) Implementing ControlValueAccessor is considered the optimal approach.

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