AngularJS自定义指令

村口二丫2021-12-03 11:27

  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;
});

  以上就是开课吧小编为大家整理发布的“AngularJS自定义指令”一文,更多相关内容尽在开课吧广场Web教程频道。

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