angularjs可交互的directive

directive开发上手练手，以注释的方式说明

html

<body ng-app="demo" ng-controller="demoController">
    <h3>rn-stepper demo (1/5){{rating}}</h3>
        Model value : {{ rating }}<br>
        Form Has been modified : {{ form.$dirty }}
        <hr>
    <div ng-model="rating" rn-stepper></div>
</body>

css

body {
 font-family: 'Roboto', sans-serif;
}


$stepper-height: 40px;
$stepper-value- 40px;
$stepper-button- 40px;
$stepper-border- 1px;
$stepper-button-bg: #4D4DFF;
$stepper-value-bg: #eee;
div[rn-stepper] {
    border:1px solid #bbb;
    display:inline-block;
    height:$stepper-height + ($stepper-border-width * 2);
    box-sizing:border-box;
    button {
        appearance:none;
        -webkit-appearance:none;
        margin:0;
        border:0;
         $stepper-button-width;
        height:$stepper-height;
        box-sizing:border-box;
        background: $stepper-button-bg;
        color: white;
        font-weight:bold;
        font-size:20px;
         outline: none;
        &:active {
            box-shadow: inset 0 2px 2px rgba(0, 0, 0, 0.25);
            background: darken($stepper-button-bg, 5%);
       }
    }
    div {
        vertical-align:top;
        $stepper-value-width;
        background:$stepper-value-bg;
        text-align:center;
        display:inline-block;    
        height:$stepper-height;
        line-height:$stepper-height;
        box-sizing:border-box;
        
    }
}

javascript

angular.module('demo', [])

.controller('demoController',['$scope',function($scpoe){
$scpoe.rating=52;

}])

.directive('rnStepper', function() {
    return {
        restrict: 'AE',
        require:'ngModel',/*使用属性模式调用，依赖了ngModel指令*/
        scope:{},
        template: '<button ng-click="decrement()">-</button>' +
                  '<div></div>' +
                  '<button ng-click="increment()">+</button>',
        //link函数可以接受require指令的controller，ngModelController
        link:function(scope,element,attrs,ngModelController){
        
          //利用ngModel指令的controller我们可以利用他的方法很多事情
          ngModelController.$render=function(){
                element.find('div').text(ngModelController.$viewValue);
          };
          function updateModel(offset){
          	ngModelController.$setViewValue(ngModelController.$viewValue+offset);
            ngModelController.$render();
          };
          scope.decrement=function(){
          	updateModel(-1);
          };
          scope.increment=function(){
          	updateModel(1);
          };
        }
    };
});

学习的最好办法就是，多练习，照抄都行 -- 莎撤丹斯基