What steps are required when utilizing ngModelOptions allowInvalid = true in AngularJS?

As a newcomer to AngularJS, I am currently navigating a complex form and it seems like incorporating the ngModelOptions { allowInvalid: true } option could prove beneficial.

I can only assume that AngularJS's default behavior of discarding the model value if the view value is invalid serves a valid purpose. My initial thought is to prevent the submission of invalid data to the server when the user attempts to save.

My current queries include:

What Angular features will no longer be accessible if I opt for this option?
I understand that I may have to manually verify the validity of these values each time the user tries to submit the form. Are there any built-in Angular methods that could assist in checking data integrity and displaying error messages?
Is there any other aspect that I might be overlooking while considering the implementation of this option?

javascript angularjs

Answer №1

When utilizing this flag, be aware that you are not sacrificing any angular features except for ensuring invalid values cannot be set on the model.

The model control will still be recognized as invalid, but rather than having the value set to undefined, it will now accept the invalid value being set on the model.

It is important to keep in mind that when using this flag, anything monitoring the model value should be taken into consideration. Once the flag is activated, an invalid field may not trigger $watch events as expected, potentially leading to passing incorrect values to other directives or functions.

Answer №2

Utilizing the feature AllowInvalid comes in handy when there is a need to work with an invalid value. For instance, creating a directive for displaying password strength can be a good use case. Without allowing passwords under 7 characters, you wouldn't be able to provide feedback until the user reaches the 8th character.

Despite using AllowInvalid, the field is not marked as valid, so you can still utilize form.password.$invalid to show error messages.

Prior to submission, it's possible to verify if the field or even the entire form is valid before sending the data.

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