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。

   name="Mahesh">
name="Piyush">

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: {{student.name}} , Roll No: {{student.rollno}}";     //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($scope, element, attributes) {            element.html("Student: "+$scope.student.name +" , Roll No: "+$scope.student.rollno+"
"); 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

         </span><span class="pln" style="box-sizing: border-box; color: rgb(0, 0, 0);">Angular JS Custom Directives</span><span class="tag" style="box-sizing: border-box; color: rgb(0, 0, 136);">         

AngularJS Sample Application

ng-app="mainApp" ng-controller="StudentController"> name="Mahesh">
name="Piyush">
src="http://ajax.googleapis.com/ajax/libs/angularjs/1.2.15/angular.min.js">

结果

在Web浏览器中打开textAngularJS.html。看到结果如下:

AngularJS Custom Directives
 


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