如何获得承诺的价值已经解决了吗？ [英] How to get value of promise that already resolved?
问题描述
我有我在我的UI结合的承诺。当承诺解决和UI元素渲染然后我就可以点击UI元素。在我的控制器code，其中我处理click我想采取行动的承诺的价值。在我的角度code这一点，我已经知道，承诺解决..但是，当我想要得到的值，其犹一个承诺。
I have a promise that I am binding to in my UI. When the promise resolves and the UI element renders I can then click on that UI element. In my controller code where I handle the click I would like to act on the value of the promise. At this point in my angular code I already know that the promise is resolved.. but when I want to get the value its still a promise.
请告诉我最好的方式得到承诺的价值......因为我知道它一定已经解决了？
Whats the best way to get the value of the promise... given that I know it must have resolved?
推荐答案
承诺始终是承诺 - 这是他们应该的。虽然是可能的一个承诺直接绑定到视图，我一般因为它缺少透明度，并可能导致视图闪烁阻止这种做法。更好的方法是在指定的范围值然后电话：
Promises are always promises - and that's how they should be. While it is possible to bind a promise directly to the view, I generally discourage this practice because it lacks transparency and can lead to view flickering. A better solution is to assign a scope value in a then call:
myService.then(function( val ) {
$scope.val = val;
});
在 $ scope.val 准备好了，它总是可以直接视为价值 - 因为它是
When $scope.val is ready, it can always be treated directly as a value - because it is.
这是说，如果你想直接做的承诺任务，你就必须把它当作一个承诺;也就是说，你需要调用 promise.then（函数（）{...}）; 。这似乎是一个不便之处，但它实际上是证明了强大的承诺是多么的。
That said, if you want to do the promise assignment directly, you just have to treat it like a promise; that is, you need to call promise.then(function () { ... });. This seems like an inconvenience, but it's actually a testament to just how powerful promises are.
如果你想在承诺一些更多的信息，我pontificated他们（并提供了code的例子）对于最近Google+视频群聊，在这里我介绍的优势，常见的用途，并在AngularJS承诺的最佳做法：<一HREF =https://plus.google.com/events/cljavmi7kpup1fso43k3fkpk2eg> AngularJS小聚 - 承诺，承诺
公司承诺，承诺。永无止境的承诺链的想法是专门处理，但我没有时间code从我的头顶。
If you want some more info on promises, I pontificated on them (and provided code examples) for a recent Google+ Hangout, where I covered the advantages, common uses, and best practices of promises in AngularJS: AngularJS Hangout -- Promises, Promises Promises, Promises. The idea of never-ending promise chains was specifically addressed, though I don't have a timecode off the top of my head.
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