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AngularJS教程
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AngularJS第一个应用程序
AngularJS指令
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AngularJS过滤器
AngularJS表格
AngularJS HTML DOM
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AngularJS包括
AngularJS Ajax
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AngularJS作用域
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AngularJS自定义指令
AngularJS国际化
 
 

AngularJS自定义指令
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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 - 指令遇到时激活一个匹配的元素。
  • Attribute - - 指令遇到时激活一个匹配的属性。
  • CSS - - 指令遇到时激活匹配CSS样式。
  • Comment - - 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('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('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;
  });

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('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>

输出

在Web浏览器中打开textAngularJS.html。看到结果如下:


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