AngularJS ng-disabled directive allows you to disable the specified

When validating an email and password input using AngularJS, I can check for the following conditions:

myForm.$error.required

This checks if the input fields are required and have values. I can also validate the email input using the following:

myForm.email.$valid

This checks the email input against a regex pattern. When printing the result using {{ the above code }}, I can see the boolean validation result for both inputs, which is correct. However, when I try to use ng-disabled on a button with both expressions, it does not work. If I use ng-disabled with only one expression it works, but I am unable to combine both expressions like this:

<button type="submit" ng-disabled="myForm.$error.required && !myForm.email.$valid">Sign in</button>

The issue seems to be that the result is true based on the first expression alone. I thought using && meant that both conditions needed to be met in order for it to result in true. Could it be because true + false equals true in this case?

Answer №1

yes + no is not equivalent to yes && no, it actually represents yes || no,

This is why the expected outcome is not achieved, so:

<button type="submit" ng-disabled="myForm.$error.required || !myForm.email.$valid">Sign in</button>

Answer №2

To effectively disable the button when the entire form is invalid, utilize ng-disabled="myForm.$invalid".

If you wish to also disable the button when the email field is empty or contains an invalid email address, use || instead of && to cover both scenarios. This way, the button will be disabled in either case.

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