AngularJS自定义指令

自定义指令中使用AngularJS扩展HTML的功能。自定义指令使用的“指令”的功能定义。自定义指令只是替换了它被激活的元素。引导过程中AngularJS应用程序找到了匹配的元素，并做好使用自定义指令compile()方法一次活动再处理使用基于指令的范围自定义指令link()方法的元素。 AngularJS提供支持，以下列元素的类型来创建自定义指令。

Element directives%uA0- 指令遇到时激活一个匹配的元素。
Attribute%uA0- - 指令遇到时激活一个匹配的属性。
CSS%uA0- - 指令遇到时激活匹配CSS样式。
Comment%uA0- - 指令遇到时激活匹配的注释。

了解自定义指令

定义自定义的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(&aposstudent&apos, function() {
   //define the directive object
   var directive = {}
   //restrict = E, signifies that directive is Element directive
   directive.restrict = &aposE&apos
   //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
})

定义控制器以更新范围为指令。在这里，我们使用name属性值作为子的作用域。

mainApp.controller(&aposStudentController&apos, function($scope) {
      $scope.Mahesh = {}
      $scope.Mahesh.name = "Mahesh Parashar"
      $scope.Mahesh.rollno  = 1

      $scope.Piyush = {}
      $scope.Piyush.name = "Piyush Parashar"
      $scope.Piyush.rollno  = 2
})

例子

<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="http://ajax.googleapis.com/ajax/libs/angularjs/1.2.15/angular.min.js"></script>
   <script>
      var mainApp = angular.module("mainApp", [])
	  
      mainApp.directive(&aposstudent&apos, function() {
         var directive = {}
         directive.restrict = &aposE&apos
         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(&aposStudentController&apos, 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>

结果

在Web浏览器中打开textAngularJS.html。看到结果如下：

%uA0

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例子

结果