AngularJS 自定义指令

在 AngularJS 中使用自定义指令来扩展 HTML 的功能。自定义指令是使用"指令"函数定义的。自定义指令只是替换为其激活的元素。 AngularJS 应用程序在引导期间找到匹配的元素并使用自定义指令的 compile() 方法执行一次活动，然后根据指令的范围使用自定义指令的 link() 方法处理元素。 AngularJS 支持为以下类型的元素创建自定义指令。

Element directives-当遇到匹配元素时激活指令。
Attribute-当遇到匹配的属性时激活指令。
CSS-当遇到匹配的 css 样式时激活指令。
Comment-当遇到匹配的评论时激活指令。

了解自定义指令

定义自定义 html 标签。

<student name = "Mahesh"></student><br/>
<student name = "Piyush"></student>

定义自定义指令来处理上面的自定义 html 标签。

var mainApp = angular.module("mainApp", []);
//Create a directive, first parameter is the html element to be attached.	  
//We are attaching student html tag. 
//this directive will be activated as soon as any student element is encountered in html
mainApp.directive('student', function() {
   //define the directive object
   var directive = {};
   
   //restrict = E, signifies that directive is Element directive
   directive.restrict = 'E';
   
   //template replaces the complete element with its text. 
   directive.template = "Student: <b>{{student.name}}</b> , 
      Roll No: <b>{{student.rollno}}</b>";
   
   //scope is used to distinguish each student element based on criteria.
   directive.scope = {
      student : "=name"
   }
   
   //compile is called during application initialization. AngularJS calls 
      it once when html page is loaded.
	
   directive.compile = function(element, attributes) {
      element.css("border", "1px solid #cccccc");
      
      //linkFunction is linked with each element with scope to get the element specific data.
      var linkFunction = function($scope, element, attributes) {
         element.html("Student: <b>"+$scope.student.name +"</b> , 
            Roll No: <b>"+$scope.student.rollno+"</b><br/>");
         element.css("background-color", "#ff00ff");
      }
      return linkFunction;
   }
   
   return directive;
});

定义控制器以更新指令的范围。这里我们使用 name 属性的值作为作用域的子级。

mainApp.controller('StudentController', function($scope) {
   $scope.Mahesh = {};
   $scope.Mahesh.name = "Mahesh Parashar";
   $scope.Mahesh.rollno  = 1;
   
   $scope.Piyush = {};
   $scope.Piyush.name = "Piyush Parashar";
   $scope.Piyush.rollno  = 2;
});

示例

<html>
   <head>
      <title>Angular JS Custom Directives</title>
   </head>
   
   <body>
      <h2>AngularJS Sample Application</h2>
      
      <div ng-app = "mainApp" ng-controller = "StudentController">
         <student name = "Mahesh"></student><br/>
         <student name = "Piyush"></student>
      </div>
		
      <script src = "https://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js">
      </script>
      
      <script>
         var mainApp = angular.module("mainApp", []);
         
         mainApp.directive('student', function() {
            var directive = {};
            directive.restrict = 'E';
            directive.template = "Student: <b>{{student.name}}</b> , 
               Roll No: <b>{{student.rollno}}</b>";
            
            directive.scope = {
               student : "=name"
            }
            directive.compile = function(element, attributes) {
               element.css("border", "1px solid #cccccc");
               
               var linkFunction = function($scope, element, attributes) {
                  element.html("Student: <b>"+$scope.student.name +"</b> , 
                     Roll No: <b>"+$scope.student.rollno+"</b><br/>");
                  element.css("background-color", "#ff00ff");
               }
               return linkFunction;
            }
            
            return directive;
         });
         mainApp.controller('StudentController', function($scope) {
            $scope.Mahesh = {};
            $scope.Mahesh.name = "Mahesh Parashar";
            $scope.Mahesh.rollno  = 1;
            $scope.Piyush = {};
            $scope.Piyush.name = "Piyush Parashar";
            $scope.Piyush.rollno  = 2;
         });
      </script>
      
   </body>
</html>

AngularJS 国际化

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