$scope.$apply() 按需要强制渲染前端页面

虽然angularJS可以实现双向数据绑定,但有时,数据发生改变的时候前端页面展示的信息并不会更新,这时就可以借助$scope.$apply() 强制重新渲染。

见小案例:

<!DOCTYPE HTML>
<html ng-app>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>$scope.$apply()</title>
<script src="../js/angular.min.js"></script>
<script>

function Aaa($scope){
	$scope.name = 'hello';
	setTimeout(function(){
		$scope.$apply(function(){
			$scope.name = 'hi';
		});
	},2000);		
}

</script>
</head>

<body>

<div ng-controller="Aaa" >
	<p>{{name}}</p>
</div>

</body>
</html>

本例的其他实现方式有,通过$timeout 实现 2s 后 "hello"刷新为“hi”.

<!DOCTYPE HTML>
<html ng-app>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>$scope.$apply()</title>
<script src="../js/angular.min.js"></script>
<script>

function Aaa($scope,$timeout){
	$scope.name = 'hello';

	$timeout(function(){
		$scope.name = 'hi';
	},2000);
	

	
}

</script>
</head>

<body>

<div ng-controller="Aaa" >
	<p>{{name}}</p>
</div>

</body>
</html>

通过触发时间实现  "hello"刷新为“hi”.

<!DOCTYPE HTML>
<html ng-app>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>$scope.$apply()</title>
<script src="../js/angular.min.js"></script>
<script>

function Aaa($scope,$timeout){
	$scope.name = 'hello';
	$scope.show = function(){
		$scope.name = 'hi';
	};
	
}

</script>
</head>
<body>
<div ng-controller="Aaa" ng-click="show()">
	<p>{{name}}</p>
</div>

</body>
</html>

 

/** * Created by wupeng5 on 2016/5/9. */ var app = angular.module("app",['ui.router','oc.lazyLoad','tableKillModule','selectModule',"select2Module"]).config(function($stateProvider,$controllerProvider,$compileProvider,$filterProvider,$provide,$urlRouterProvider,$httpProvider){ $urlRouterProvider.otherwise('login'); //引入$stateProvider对象,为动态路由做准备 app.register = { stateProvider:$stateProvider } //$locationProvider.html5Mode(true); $httpProvider.defaults.headers.put['Content-Type'] = 'application/x-www-form-urlencoded; charset=UTF-8'; $httpProvider.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded; charset=UTF-8'; $httpProvider.defaults.headers.common["Accept"] = 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8'; $httpProvider.defaults.headers.post['X-Requested-With'] = 'XMLHttpRequest'; $httpProvider.defaults.transformRequest = [function(data) { /** * The workhorse; converts an object to x-www-form-urlencoded serialization. * @param {Object} obj * @return {String} */ var param = function(obj) { var query = ''; var name, value, fullSubName, subName, subValue, innerObj, i; for (name in obj) { value = obj[name]; if (value instanceof Array) { for (i = 0; i < value.length; ++i) { subValue = value[i]; fullSubName = name + '[' + i + ']'; innerObj = {}; innerObj[fullSubName] = subValue; query += param(innerObj) + '&'; } } else if (value instanceof Object) { for (subName in value) { subValue = value[subName]; fullSubName = name + '[' + subName + ']'; innerObj = {}; innerObj[fullSubName] = subValue; query += param(innerObj) + '&'; } } else if (value !== undefined && value !== null) { query += encodeURIComponent(name) + '=' + encodeURIComponent(value) + '&'; } } return query.length ? query.substr(0, query.length - 1) : query; }; return angular.isObject(data) && String(data) !== '[object File]' ? param(data) : data; }]; //配合nginx处理本地开发, 服务器调式的问题(接口是跨域的) $httpProvider.interceptors.push(function($q){ return { 'request':function(config){ if(config.url.indexOf('html') == -1){ config.url = "" + config.url; } return config || $q.when(config); } } }); //注销RootScope上面的广播事件 //var deregister = $rootScope.$on("rootEvent", function(event,data) { // //}); // //$scope.$on('$destory', function() { // deregister(); // 退订事件 //}); //注册$onRootScope方法,并在执行完毕后直接销毁, 防止内存溢出 $provide.decorator('$rootScope',['$delegate',function($delegate){ Object.defineProperty($delegate.constructor.prototype,'$onRootScope',{ value:function(name,listener){ var unsubscribe = $delegate.$on(name,listener); this.$on('$destroy',unsubscribe); }, enumerable:false }); return $delegate; }]) //使用,不需要手动去销毁这个事件 //$scope.$onRootScope("key",function(){ // console.log("get key"); //}) //$rootScope.$broadcast("key",{name:1}); }); app.factory('timestampMarker', [function() { return { request: function(config) { config.requestTimestamp = new Date().getTime(); return config; }, response: function(response) { response.config.responseTimestamp = new Date().getTime(); return response; } }; }]); app.config(['$httpProvider', function($httpProvider) { $httpProvider.interceptors.push('timestampMarker'); }]); //$http.get('xxxx').then(function(response) { // var time = response.config.responseTimestamp - response.config.requestTimestamp; // console.log('The request took ' + (time / 1000) + ' seconds.'); //}); //当路由变化的时候触发 app.run(function($rootScope,$templateCache) { $rootScope.isLogin = true; $rootScope.loginStyle = ""; $rootScope.$on('$stateChangeStart', function (event, current, previous) { if(current.name != "login" && $rootScope.currentState != current.name){ // console.log($rootScope.currentState); $rootScope.currentState = current.name; } //清理所有template缓存 if (typeof(current) !== 'undefined'){ $templateCache.removeAll(); } $rootScope.currentName = current.name; if($rootScope.currentName == "login"){ $rootScope.isLogin = false; $rootScope.loginStyle = "login"; $rootScope.col = ""; }else{ $rootScope.isLogin = true; $rootScope.loginStyle = ""; } }); });代码审计一下
最新发布
08-23
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