Instruction: Describe the process of creating and applying custom validation logic through directives in AngularJS.
Context: Candidates will outline their ability to extend AngularJS's validation framework to suit custom business rules.
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Firstly, to create a custom validation directive in AngularJS, we begin by defining a new directive. In my approach, I ensure the directive is specific, reusable, and modular. For instance, if we're validating an email format that's unique to our business logic, I would name the directive businessEmailValidator. This naming convention immediately clarifies the directive's purpose to the team and maintains code readability.
app.directive('businessEmailValidator', function() { return { require: 'ngModel', link: function(scope, element, attrs, ngModel) { ngModel.$validators.businessEmail = function(modelValue) { // Custom validation logic here return /* Validation Expression */; }; } }; });...