Javascript 在 angularjs 工厂中使用 setInterval
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using setInterval in angularjs factory
提问by user183123
I was trying the code given in angularjs docs (given here: http://jsfiddle.net/zGqB8/) It just implements a time factory and uses $timeout to update the time object after each second.
我正在尝试 angularjs 文档中给出的代码（在此处给出：http: //jsfiddle.net/zGqB8/）它只是实现了一个时间工厂，并使用 $timeout 每秒更新时间对象。
angular.module('timeApp', [])
.factory('time', function($timeout) {
var time = {};
(function tick () {
time.now = new Date().toString();
$timeout(tick, 1000); // how to do it using setInterval() ?
})();
return time;
});
How would I do it using setInterval() function instead of $timeout() ?
I know that one need to use scope.$apply()to enter the angular execution context but how would that work in a factory function? I mean, in a controller, we have a scope, but we don't have scope in a factory function?
我将如何使用 setInterval() 函数而不是 $timeout() 来做到这一点？我知道需要使用scope.$apply()Angular 执行上下文，但这在工厂函数中如何工作？我的意思是，在控制器中，我们有一个范围，但我们在工厂函数中没有范围？
回答by asgoth
You can use $timeoutas an interval.
您可以$timeout用作间隔。
var myIntervalFunction = function() {
cancelRefresh = $timeout(function myFunction() {
// do something
cancelRefresh = $timeout(myIntervalFunction, 60000);
},60000);
};
If the view is destroyed, you can destroy it with listening on $destroy:
如果视图被销毁，您可以通过监听来销毁它$destroy：
$scope.$on('$destroy', function(e) {
$timeout.cancel(cancelRefresh);
});
回答by BradGreens
Update
更新
Angular has implemented an $interval feature in version 1.2 - http://docs.angularjs.org/api/ng.$interval
Angular 在 1.2 版中实现了 $interval 功能 - http://docs.angularjs.org/api/ng.$interval
Legacy example below, disregard unless you're using a version older than 1.2.
下面的旧示例，除非您使用的版本早于 1.2，否则请忽略。
A setInterval implementation in Angular -
Angular 中的 setInterval 实现 -
I've created a factory called timeFunctions, which exposes $setInterval and $clearInterval.
我创建了一个名为 timeFunctions 的工厂，它公开了 $setInterval 和 $clearInterval。
Note that any time I've needed to modify scope in a factory I've passed it in. I am unsure if this meets the "Angular way" of doing things, but it works well.
请注意，任何时候我需要修改工厂中的范围时，我都会将其传入。我不确定这是否符合“Angular 方式”的做事方式，但它运行良好。
app.factory('timeFunctions', [
"$timeout",
function timeFunctions($timeout) {
var _intervals = {}, _intervalUID = 1;
return {
$setInterval: function(operation, interval, $scope) {
var _internalId = _intervalUID++;
_intervals[ _internalId ] = $timeout(function intervalOperation(){
operation( $scope || undefined );
_intervals[ _internalId ] = $timeout(intervalOperation, interval);
}, interval);
return _internalId;
},
$clearInterval: function(id) {
return $timeout.cancel( _intervals[ id ] );
}
}
}
]);
Example Usage:
示例用法：
app.controller('myController', [
'$scope', 'timeFunctions',
function myController($scope, timeFunctions) {
$scope.startFeature = function() {
// scrollTimeout will store the unique ID for the $setInterval instance
return $scope.scrollTimeout = timeFunctions.$setInterval(scroll, 5000, $scope);
// Function called on interval with scope available
function scroll($scope) {
console.log('scroll', $scope);
$scope.currentPage++;
}
},
$scope.stopFeature = function() {
return timeFunctions.$clearInterval( $scope.scrollTimeout );
}
}
]);
回答by Greg
Could you call a normal JavaScript method and then within that method wrap the Angular code with an $apply?
您能否调用一个普通的 JavaScript 方法，然后在该方法中用 $apply 包装 Angular 代码？
Example
例子
timer = setInterval('Repeater()', 50);
var Repeater = function () {
// Get Angular scope from a known DOM element
var scope = angular.element(document.getElementById(elem)).scope();
scope.$apply(function () {
scope.SomeOtherFunction();
});
};
