Can i setup a validation that is conditional ?

[rluiten]

I've tried to use addValidator() and removeValidator() and have it working but its pretty awful IMO.
Going in I had almost expected that validation rules on a field would be disabled if ng-required was false. But then maybe that was an unreasonable expectation.

Maybe I am just missing something obvious.

We have quiet a few forms were some fields appear and are required to have a value if a checkbox is selected.

Thanks for reading,
Rob.

[ghiscoding]

The function of removeValidator() is made to completely remove it, it's not made for what you want to do.

If you want to validate a field only after your checkbox is selected, then you should add the validation on your input but make your input disabled with ngDisabled and only make it enable once the checkbox is clicked. Angular-Validation does not validate a field that is disabled, but will validate if it becomes enable. You can see that in the demo I made on the Live Plunker Demo the last field.

This is the code from the demo with a radio button, just change the radio to a checkbox and you are good to go

<div class="form-group">
            <label for="input4">ngDisabled =></label>
            ON <input type="radio" id="radioDisableInput4_on" ng-model="vm.disableInput4" value="on" ng-init="vm.disableInput4 = 'on'">
            OFF <input type="radio" id="radioDisableInput4_off" ng-model="vm.disableInput4" value="off">
            <input type="text" class="form-control" name="input4" placeholder="alpha_dash|min_len:2|required" ng-model="vm.input4" validation="alpha_dash|min_len:2|required" ng-disabled="vm.disableInput4 == 'on'" />
        </div>

[rluiten]

That makes perfect sense [it was something I was missing], all the code here currently uses conditional on ng-required - which works but isn't as intention revealing. We still have a fair bit of not using angular-validation yet.

One further question, I have modified this form to use ng-disabled and it works and gets rid of the mess I had made before.

However one further hiccup, by using ng-disabled with the right condition the field appears correctly and is required correctly but it is marked in red with validation message on first appearance. The state of enabled field shows up with $pristine true and $valid false, now this is the same as the other fields that were never disabled to start with, but the other field do not show the validation markings until after being dirty, or submit has run which executes checkFormValidity() to flag all fields for the user.

Extra bit of info, before the control is enabled $valid is true, maybe the transition to false of being enabled is causing the marking ?

[ghiscoding]

I believe that is normal behavior to have the red border, because the field is really invalid since it's required. What you have to do is to change your CSS to only show red border on dirty.

This is part of my CSS to do that

/* invalid & (dirty or touched) => red -- CSS3 only */
.ng-invalid.ng-dirty:not(:focus),
.ng-invalid.ng-touched:not(:focus) {
    border-color: #e74c3c;
}

/* valid & dirty => green */
.ng-valid.ng-dirty.ng-touched {
    border-color: #2ecc71;
}

If you have no more questions and this fixes your problem, please close this issue. Thanks

[rluiten]

Ill restate my comment, maybe I did not express myself sufficiently.

The other fields all have validation="required", and are not showing the validation when they are shown. It is common to not show it if the control is still pristine$ I believe this is why you provide the checkFormValidity() to force them to be visible if for example if someone wants them all to appear if someone presses submit button.

Its just the enabled form field is shown differently from other fields that also required on the form, it is shown invalid when others are not yet.

[rluiten]

Hmm interesting, this field that has been enabled is marked $touched is true.

[ghiscoding]

Ah now I think I know what you mean. Yes that is how I coded it, when you enable it, I validate and touch the item, if it's required then the error message will show right away. You can see that in the live demo.

I should maybe change that and only show it right if the global option of preValidateFormElements is True. Looks like I'm never done with this library :'(

[ghiscoding]

When a field get re-enable, I run the validation on it and I also mark it as $touched, which is what you found out.

I found the code where it does that, I'll have to change to few things to do as said in my previous comment:
I should maybe change that and only show it right if the global option of preValidateFormElements is True.

I will have to modify my Protractor tests also, since it changes a few things and it will fail. I will see if I can push that in the next couple hours or tomorrow.

[rluiten]

Don't do it on my account we are weeks from next deployment at moment.

Extra note, as a test I added an ng-disabled="false" to one of my normal form fields and it also gets the validation shown immediately. Which make sense in the light of your comments.

[rluiten]

My colleague just asked me a related question, he is aware of a few forms where a field that is normally optional becomes a required field when a checkbox is set to true. Does this scenario require the use of the addValidator() removeValidator() methods ?

As a side note, i think making removeValidator() not crash if there isnt a validator allready there would be a good thing.

[ghiscoding]

I already got something close to working, but I want to take a break now, it will not validate automatically anymore (unless you have the global options preValidateFormElements is True). Which is how I should have coded it at first, it makes more sense that way.

What do you mean by removeValidator() crash? What are your function arguments?

The removeValidator() was created to completely remove all validators to the field. You could use the addValidator() to add it back, but playing with those 2 functions might not always be the best. If you want to dynamically add validation, you could also do it yourself through Angular interpolation, you could probably do something like this: <input type="text" name="field2" validation="{{vm.isRequired}}" /> where the vm.isRequired is set somewhere in your controller or in your view by another field, up to you. You just need to be creative and find a solution, there is multiple ways to do it, just think about it and have fun finding a solution...

I can't put everything into Angular-Validation, it's already doing a lot, I don't want to over complicate it, with extra features that are not always necessary.

[rluiten]

Ahh i feel stupid now :), while I've used angular a bit now, still not always doing things the easy way.

[rluiten]

I have tried out the interpolation to validation.
It sort of works, field 1 defaults to required field 2 is the inverse.
Then i can toggle the required validation between the two with the checkbox in the example

http://plnkr.co/edit/XLhq6Cxf9d53vUfpvJJ1?p=preview

I get to see field 1 get the validation message, and it toggles on and off with the check box, but field 2 never produces the validation field even if i go into it and out of it or type something in and then remove the content toggling check box before and after the operation to try and see the validation message

Maybe its a just a bug ?