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Create a custom $parser and add it to the ngModel controller, which in more human translation could mean for example, adding a custom validator to the ng-model of the input.
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| <!DOCTYPE html> | |
| <html lang="en" ng-app="app"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>$parsers demo</title> | |
| </head> | |
| <body> | |
| <form name="sampleForm"> | |
| <input name="strongSecret" type="text" ng-model="strongSecret" strong-secret required> | |
| <dir ng-messages="sampleForm.strongSecret.$error"> | |
| <div ng-message="numberValidator">Strong secret has to contain at least 1 number</div> | |
| <div ng-message="uppercaseValidator">Strong secret has to contain at least 1 uppercase</div> | |
| <div ng-message="sixCharactersValidator">Strong secret has to exactly 6 characters long</div> | |
| </dir> | |
| </form> | |
| <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/angularjs/1.3.4/angular.js"></script> | |
| <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/angularjs/1.3.4/angular-messages.js"></script> | |
| <script type="text/javascript" src="index.js"></script> | |
| </body> | |
| </html> |
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| angular.module('app', ['ngMessages']); | |
| angular.module('app').directive('strongSecret', function() { | |
| return { | |
| restrict: 'A', | |
| require: 'ngModel', | |
| link: function(scope, element, attr, ctrl) { | |
| function customValidator(ngModelValue) { | |
| if (/[A-Z]/.test(ngModelValue)) { | |
| ctrl.$setValidity('uppercaseValidator', true); | |
| } else { | |
| ctrl.$setValidity('uppercaseValidator', false); | |
| } | |
| if (/[0-9]/.test(ngModelValue)) { | |
| ctrl.$setValidity('numberValidator', true); | |
| } else { | |
| ctrl.$setValidity('numberValidator', false); | |
| } | |
| if (ngModelValue.length === 6) { | |
| ctrl.$setValidity('sixCharactersValidator', true); | |
| } else { | |
| ctrl.$setValidity('sixCharactersValidator', false); | |
| } | |
| return ngModelValue; | |
| } | |
| ctrl.$parsers.push(customValidator); | |
| } | |
| }; | |
| }); |
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| link: function(scope, element, attr, ctrl) { | |
| // please note you can name your function & argument anything you like | |
| function customValidator(ngModelValue) { | |
| // check if contains uppercase | |
| // if it does contain uppercase, set our custom `uppercaseValidator` to valid/true | |
| // otherwise set it to non-valid/false | |
| if (/[A-Z]/.test(ngModelValue)) { | |
| ctrl.$setValidity('uppercaseValidator', true); | |
| } else { | |
| ctrl.$setValidity('uppercaseValidator', false); | |
| } | |
| // check if contains number | |
| // if it does contain number, set our custom `numberValidator` to valid/true | |
| // otherwise set it to non-valid/false | |
| if (/[0-9]/.test(ngModelValue)) { | |
| ctrl.$setValidity('numberValidator', true); | |
| } else { | |
| ctrl.$setValidity('numberValidator', false); | |
| } | |
| // check if the length of our input is exactly 6 characters | |
| // if it is 6, set our custom `sixCharactersValidator` to valid/true | |
| // othwise set it to non-valid/false | |
| if (ngModelValue.length === 6) { | |
| ctrl.$setValidity('sixCharactersValidator', true); | |
| } else { | |
| ctrl.$setValidity('sixCharactersValidator', false); | |
| } | |
| // we need to return our ngModelValue, to be displayed to the user(value of the input) | |
| return ngModelValue; | |
| } | |
| // we need to add our customValidator function to an array of other(build-in or custom) functions | |
| // I have not notice any performance issues, but it would be worth investigating how much | |
| // effect does this have on the performance of the app | |
| ctrl.$parsers.push(customValidator); | |
| } |
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| <ul class="error-msgs" ng-messages="sampleForm.strongSecret.$error"> | |
| <li ng-message="numberValidator">Strong secret has to contain at least 1 number</li> | |
| <li ng-message="uppercaseValidator">Strong secret has to contain at least 1 uppercase</li> | |
| <li ng-message="sixCharactersValidator">Strong secret has to be exactly 6 characters long</li> | |
| </ul> |
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| // remember, directive name must start with a lower case & use camel case naming convetion | |
| angular.module('app').directive('strongSecret', function() { | |
| return { | |
| // limit usage to argument only | |
| restrict: 'A', | |
| // require NgModelController, i.e. require a controller of ngModel directive | |
| require: 'ngModel', | |
| // create linking function and pass in our NgModelController as a 4th argument | |
| link: function(scope, element, attr, ctrl) { | |
| } | |
| }; | |
| }); |
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| <form name="sampleForm"> | |
| <input name="strongSecret" type="text" ng-model="strongSecret" strong-secret required placeholder="Please provide stron secret"> | |
| </form> |
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