由于业务的需要，最近angular 的diretive 研究的比较多，有和同事一起共同协作开发scada的项目， 对directive 有了进一步更深的理解。

感觉才开始真正理解了这句话的意思:

In an AngularJS directive the scope allows you to access the data in the attributes of the element to which the directive is applied

这句话，感觉道出了diretive的原理的精髓。

--------------------------------------------------------------------------------------------------------------------

> is not in the documentation.

< is for one-way binding.

@ binding is for passing strings. These strings support {{}} expressions for interpolated values.

= binding is for two-way model binding. The model in parent scope is linked to the model in the directive's isolated scope.

& binding is for passing a method into your directive's scope so that it can be called within your directive.

When we are setting scope: true in directive, Angular js will create a new scope for that directive. That means any changes made to the directive scope will not reflect back in parent controller.

---------------------------------------------------------------------------------------------------------------------

In an AngularJS directive the scope allows you to access the data in the attributes of the element to which the directive is applied.

This is illustrated best with an example:

<div my-customer name="Customer XYZ"></div>

and the directive definition:

angular.module('myModule', [])

.directive('myCustomer', function() {

  return {

    restrict: 'E',

    scope: {

      customerName: '@name'

    },

    controllerAs: 'vm',

    bindToController: true,

    controller: ['$http', function($http) {

      var vm = this;

      vm.doStuff = function(pane) {

        console.log(vm.customerName);

      };

    }],

    link: function(scope, element, attrs) {

      console.log(scope.customerName);

    }

  };

});

When the scope property is used the directive is in the so called "isolated scope" mode, meaning it can not directly access the scope of the parent controller.

In very simple terms, the meaning of the binding symbols is:

someObject: '=' (two-way data binding)

someString: '@' (passed directly or through interpolation with double curly braces notation {{}})

someExpression: '&' (e.g. hideDialog())

This information is present in the AngularJS directive documentation page, although somewhat spread throughout the page.

The symbol > is not part of the syntax.

However, < does exist as part of the AngularJS component bindings and means one way binding.

<!DOCTYPE>

<html ng-app="App">

    <head>

        <meta charset="utf-8"/>

        <script src="./js/angular.min.js"></script>

        <script>

            var app = angular.module('App', []);

            app.controller('appCtrl', function($scope){

            	// $scope.names = {age: 12};

            	$scope.names = 'FLY';

            	// DB.getAl().then(function (rsp) {

                 //    $scope.name=100;

	            // })

            	$scope.changeNames = function(){

            		$scope.names = "AAA";

                };

            	$scope.cbFun = function(name){

            		// alert('parent action.');

                    alert(name);

		            /**

                     *

                     *

                     *

		             */

	            };

            	$scope.doStuff = function () {

                    alert('parent scope');

	            }

            });

            app.directive('myCustomer', function(){

            	return {

            		scope: {

            			fly: '@'

                    },

            		restrict: 'A',

                    link: function(scope, element, attr){

            			console.log('attr: ', attr);

            			console.log("myCustomer: ", scope);

                    },

		            controllerAs: 'vmst',

		            bindToController: true,

		            controller: ['$scope', '$http', function(scope, $http) {

			            var vm = this;

                        console.log('this: ', this);

                        console.log('scope: ', scope);

			            vm.doStuff = function(pane) {

				            console.log(vm.customerName);

			            };

			            vm.name = 'pxk';

			            scope.doStuff = function(){

			            	alert('asdfafa');

                        }

		            }],

                    // template: '<button ng-click="doStuff();">aaaa</button>'

                };

            });

        </script>

    </head>

    <body ng-controller="appCtrl">

        <div my-customer="" haha="12ab3" fly="jiayou">myCustomer

            <button ng-click="doStuff();">aaa</button>

        </div>

        <hr/>

    </body>

</html>

　　

angular directive 深入理解的更多相关文章

  1. angular directive scope

    angular directive scope 1.当directive 中不指定scope属性,则该directive 直接使用 app 的scope: 2.当directive 中指定scope属 ...

  2. angular 自定义指令 directive transclude 理解

    项目中断断续续的用了下angular,也没狠下心 认真的学习.angular 特别是自定义指令这块 空白. transclude 定义是否将当前元素的内容转移到模板中.看解释有点抽象. 看解释有点抽象 ...

  3. angular directive指令内的参数

    angular.module('myApp', []) .directive('myDirective', function() { return { restrict: String, priori ...

  4. angular directive指令的复用

    “指令之之所以要定义成指令就是为了复用!” 指令一定是可以用在不同的controller里面的,为了在不同的controller去使用它,我们一定要给指定的配置项一个指令.这样才能跟外面的控制器进行交 ...

  5. 使用 angular directive 和 json 数据 D3 随着标签 donut chart演示样本

    使用angular resource载入中priorityData.json中间json数据,结合D3绘制甜甜圈图.执行index.html其结果见于图.: priorityData.json中jso ...

  6. [Angular Directive] Assign a Structual Directive a Dynamic Context in Angular 2

     Just like passing in an array to *ngFor, you can pass in any value into your structural directive s ...

  7. [Angular Directive] Implement Structural Directive Data Binding with Context in Angular

    Just like in *ngFor, you're able to pass in data into your own structural directives. This is done b ...

  8. angular directive

    1.restrict (字符串)可选参数,指明指令在DOM里面以什么形式被声明: 取值有:E(元素),A(属性),C(类),M(注释),其中默认值为A: E(元素):<directiveName ...

  9. angular directive自定义指令

    先来看一下自定义指令的写法 app.directive('', ['', function(){ // Runs during compile return { // name: '', // pri ...

随机推荐

  1. Oracle基础 12 对象 objects 同义词/序列/试图/索引

    --创建同义词create public synonym employees for hr.employees;  --公共同义词需要 create public synonym 权限 表的所有用户授 ...

  2. JS计算两个日期之间的天数

    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/ ...

  3. 使用Bind服务配置DNS服务器

    bind是什么 bind是DNS服务器软件 ,他的服务名称是named 功能区分: 正向解析:根据主机名查找对应的IP地址 反向解析:根据IP地址查找对应的主机名(域名) 工作形式上区分: 主服务器: ...

  4. java两种实现二分查找方式

    二分查找法适用于 升序排列的数组,如果你所要操作的数组不是升序排序的,那么请用排序算法,排序一下. 说明:使用二分查找法相比顺序查找  节约了时间的开销,但是增加了空间使用.因为需要动态记录 起始索引 ...

  5. ORM- 图书系统查询

    图书信息系统 表结构设计 # 书 class Book(models.Model): title = models.CharField(max_length=32) publish_date = mo ...

  6. linux+win7双系统重装win7修复grub的办法

    本人是debian+win7的双系统, 下面介绍下重装win7的整个过程以及遇到的一些小问题,在查阅相关博客和朋友的帮助下成功修复, 记录下以便以后有不时之需, 也希望能帮助到遇到同样问题的朋友! 首 ...

  7. VMware vCenter Server安装与配置

    预先准备好安装包 ESXI6    VMware-VMvisor-Installer-6.0.0.update01-3073146.x86_64.iso VC        VMware-VIMSet ...

  8. 前端nginx后端tomcat记录真实ip

    修改nginx主配置文件:/usr/local/nginx/conf/nginx.conf proxy_set_header Host $host; proxy_set_header X-Real-I ...

  9. 2017 ACM-ICPC 亚洲区（青岛赛区）网络赛 1009

    #include<cmath> #include<set> #include<list> #include<deque> #include<map ...

  10. Codeforces Round 254 (Div. 2)

    layout: post title: Codeforces Round 254 (Div. 2) author: "luowentaoaa" catalog: true tags ...