<!DOCTYPE html>
<html>
<script src="https://cdn.staticfile.net/angular.js/1.6.9/angular.min.js"></script>
<body ng-app="myApp">
<p>请试着在输入框中输入内容：</p>
<form name="myForm">
<input name="myInput" ng-model="myInput" required my-directive>
</form>
<p>输入框的有效状态是：</p>
<h1>{{myForm.myInput.$valid}}</h1>
<script>
var app = angular.module('myApp', []);app.directive('myDirective', function() { return { require: 'ngModel',
link: function(scope, element, attr, mCtrl) { function myValidation(value) { if (value.indexOf("e") > -1) { mCtrl.$setValidity('charE', true); } else { mCtrl.$setValidity('charE', false); }
return value;
}
mCtrl.$parsers.push(myValidation);
}
};
});
</script>
<p>输入框必须包含字符“e”才能被视为有效。</p>
</body>
</html>