前端学习——ionic/AngularJs——获取验证码倒计时按钮

按钮功能为：点击“获取验证码”——按钮不可用-设置倒计时-60秒后重新获取。

代码借鉴于：http://plnkr.co/edit/Swj82MpJSix3a47jZRHP?p=preview

主要实现原理：点击后，设置一个$interval，每一秒更改一次剩余时间，并依赖Angular数据绑定实时显示在页面中。设置一个$timeout，60秒后将按钮初始化到可用状态。

实现代码：

（1）js代码，设置成一个directive以便多次调用。

angular.module('winwin').directive('timerbutton', function($timeout, $interval){
    return {
        restrict: 'AE',
        scope: {
            showTimer: '=',
            timeout: '='
        },
        link: function(scope, element, attrs){
            scope.timer = false;
            scope.timeout = 60000;
            scope.timerCount = scope.timeout / 1000;
            scope.text = "获取验证码";

            scope.onClick = function(){
                scope.showTimer = true;
                scope.timer = true;
                scope.text = "秒后重新获取";
                var counter = $interval(function(){
                    scope.timerCount = scope.timerCount - 1;
                }, 1000);

                $timeout(function(){
                    scope.text = "获取验证码";
                    scope.timer = false;
                    $interval.cancel(counter);
                    scope.showTimer = false;
                    scope.timerCount = scope.timeout / 1000;
                }, scope.timeout);
            }
        },
        template: '<button on-tap="onClick()" class="button button-calm xgmm-btn" ng-disabled="timer"><span ng-if="showTimer">{{ timerCount }}</span>{{text}}</button>'
    };
});

　　（2）html代码

 <timerbutton show-timer="false">获取验证码</timerbutton>

实现效果：

（1）点击之前

（2）点击之后

干货：

<html  ng-app="myApp">
	<head>
		<title>测试_短信验证码</title>
		<meta charset="utf-8" />
	</head>
	<script src="http://cdn.static.runoob.com/libs/angular.js/1.4.6/angular.min.js"></script>
	<link rel="stylesheet" href="http://apps.bdimg.com/libs/bootstrap/3.3.4/css/bootstrap.min.css"/>
	<body>
		<timerbutton show-timer="false">获取验证码</timerbutton> 
	</body>
</html>
<script>
	angular.module('myApp',[]).directive('timerbutton', function($timeout, $interval){
    return {
        restrict: 'AE',
        scope: {
            showTimer: '=',
            timeout: '='
        },
        link: function(scope, element, attrs){
            scope.timer = false;
            scope.timeout = 60000;
            console.log("1-进来了");
            scope.timerCount = scope.timeout / 1000;
            scope.text = "获取验证码";

            scope.onClick = function(){
            	console.log("2-进来了");
                scope.showTimer = true;
                scope.timer = true;
                scope.text = "秒后重新获取";
                var counter = $interval(function(){
                    scope.timerCount = scope.timerCount - 1;
                    console.log("3-进来了");
                }, 1000);

                $timeout(function(){
                	console.log("进来了");
                    scope.text = "获取验证码";
                    scope.timer = false;
                    $interval.cancel(counter);
                    scope.showTimer = false;
                    scope.timerCount = scope.timeout / 1000;
                }, scope.timeout);
            }
        },
        template: '<button ng-click="onClick()" class="btn btn-primary" ng-disabled="timer"><span ng-if="showTimer">{{ timerCount }}</span>{{text}}</button>'
    };
});
</script>