AngularJS 验证框架

Question

创建可按以下方式使用的验证框架是否可行且不是特别困难:

var myValidations = 
[
 {   'A',
      'This is required',
       function(item) {return item != null;}
    },
    {
     'B',
      "Max 10 chars",
       function(item) {return item.length <=10 && item.length >0;}
    },
    {
     'C',
      'Must start with Z',
       function(item) {return item[0] == 'Z'}
    }];

    $scope.model.Message.AddValidation('A');
    $scope.model.Message.AddValidation('C');

    $scope.onSave = function()
    {
        if(!$scope.model.IsValid)
        {
            // $scope.model.errors
        }

    }

<input type="text" ng-model="model.Message"/>

要进行基本实现可能涉及什么？

也许我还没有偶然发现具有类似使用概念的现有 AngularJS 验证框架？

Answer 1

这是使用最新版本的 Angular 并构建使用 AngularJS 验证框架的自定义验证指令的方法:

第 1 步:添加一些样式

这是为了让事情看起来更好......

<!-- Optional theme -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap-theme.min.css">

<!-- Latest compiled and minified JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>

<style>
  ul {
    margin: 0;
    padding:0;
  }
</style>

第 2 步:添加 AngularJS 库

您需要核心 AngularJS 库和 ngMessages:

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.6/angular.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.6/angular-messages.min.js"></script>

第 3 步:定义您的验证指令

是的，我知道已经有针对“必需”和“最大长度”的预定义 AngularJS 指令，但这是一个 SO 答案，重要的是您知道如何自己定义它们。

app.directive('rqrd', function() {
  return {
    restrict: 'A',
    require: 'ngModel',
    link: function(scope, element, attr, ngModel) {
      ngModel.$validators.rqrd = function(modelValue, viewValue) {
        var value = modelValue || viewValue;
        return value != null && value != undefined && value != '';
      }
    }
  }
});

app.directive('max', function() {
  return {
    restrict: 'A',
    require: 'ngModel',
    link: function(scope, element, attr, ngModel) {
      var maxValue = parseInt(attr.max);
      ngModel.$validators.max = function(modelValue, viewValue) {
        var value = modelValue || viewValue;
        return value.length > 0 && value.length <= maxValue;
      }
    }
  } 
});

app.directive('startsWith', function() {
  return {
    restrict: 'A',
    require: 'ngModel',
    link: function(scope, element, attr, ngModel) {
      ngModel.$validators.startsWith = function(modelValue, viewValue) {
        var value = modelValue || viewValue;
        return value && value.length > 0 && value.indexOf(attr.startsWith) == 0;
      }
    }
  } 
});

第 4 步:使用您的验证指令

<form name="form">

  Favorite Color   <br />
  <input name="color" ng-model="color" rqrd max="10"  />  
  <ul ng-messages="form.color.$error">
     <li ng-message="rqrd" class="label label-danger">This is required</li>
     <li ng-message="max" class="label label-danger">Max 10 chars</li>
  </ul> 
  Name <br />
  <input name="name" ng-model="name" starts-with="Z"  /> 
    <ul ng-messages="form.name.$error">
     <li ng-message="rqrd" class="label label-danger">Please enter an Age</li>
     <li ng-message="startsWith" class="label label-danger">Must start with Z</li>
  </ul> 

</form>

检查表单是否有效

if ($scope.form.$valid) {
   ...
}

    var app = angular.module('app', ['ngMessages']);

    app.controller('ctrl', function($scope) {
       
    });

    app.directive('rqrd', function() {
      return {
        restrict: 'A',
        require: 'ngModel',
        link: function(scope, element, attr, ngModel) {
          ngModel.$validators.rqrd = function(modelValue, viewValue) {
            var value = modelValue || viewValue;
            return value != null && value != undefined && value != '';
          }
        }
      }
    });

    app.directive('max', function() {
      return {
        restrict: 'A',
        require: 'ngModel',
        link: function(scope, element, attr, ngModel) {
          var maxValue = parseInt(attr.max);
          ngModel.$validators.max = function(modelValue, viewValue) {
            var value = modelValue || viewValue;
            return value.length > 0 && value.length <= maxValue;
          }
        }
      } 
    });

    app.directive('startsWith', function() {
      return {
        restrict: 'A',
        require: 'ngModel',
        link: function(scope, element, attr, ngModel) {
          ngModel.$validators.startsWith = function(modelValue, viewValue) {
            var value = modelValue || viewValue;
            return value && value.length > 0 && value.indexOf(attr.startsWith) == 0;
          }
        }
      } 
    });

    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.6/angular.min.js"></script>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.6/angular-messages.min.js"></script>
    <!-- Latest compiled and minified CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">

    <!-- Optional theme -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap-theme.min.css">

    <!-- Latest compiled and minified JavaScript -->
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>

    <style>
      ul {
        margin: 0;
        padding:0;
      }
    </style>

    <h3>Example heading </h3>
    <div ng-app="app" ng-controller="ctrl">
    <form name="form">

      Favorite Color   <br />
      <input name="color" ng-model="color" rqrd max="10"  />  
      <ul ng-messages="form.color.$error">
         <li ng-message="rqrd" class="label label-danger">This is required</li>
         <li ng-message="max" class="label label-danger">Max 10 chars</li>
      </ul> 
      Name <br />
      <input name="name" ng-model="name" starts-with="Z"  /> 
        <ul ng-messages="form.name.$error">
         <li ng-message="rqrd" class="label label-danger">Please enter an Age</li>
         <li ng-message="startsWith" class="label label-danger">Must start with Z</li>
      </ul> 
    </form>
      
    </div>