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微信小程序 之『引入es6 promise』
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QUESTION
I have a server that sometimes can go offline and miss some open data to add in database. So I'm making a function to reach this events after going back online. Every events MUST be write ONE after ONE. Then it can listen to new one. Currently, I did do a "for loop" with promise inside that can
...ANSWER
Answered 2021-Apr-07 at 14:32Not sure why 'Loop finished, do...'
does not get logged.
But maybe we could first try tidying up your code. Firstly you have a Promise Constructor for a Promise, and your mixing thenables with async / await..
So after doing this your code could look like.
QUESTION
I am trying to learn how to chain promise with JS. I saw the code here and they did it with a forloop JavaScript ES6 promise for loop. I found it to be cool and decided to try it with small adjustments. But it failed to work. I will really appreciate it if you can tell me why this doesn't work
Here's my code:
...ANSWER
Answered 2020-Dec-10 at 01:33.then
needs a callback, not a Promise - at the moment, you're calling createPromise(i)
immediately, inside the loop. Create a function that, when called, returns a Promise instead:
QUESTION
This is a follow up to this question. I have a firebase function which is supposed to take an OTP, validate it and then change a user's password based on whether it is correct or not (for some reason I'm not able to use firebase's inbuild password reset functionality). Following is my function:
...ANSWER
Answered 2019-Dec-18 at 15:24Have a look at the documentation for Callable Cloud Functions:
- You don't need to encapsulate it in
return new Promise((resolve, reject) => {})
; - You need to return data that can be JSON encoded;
- You need to manage the errors correctly, by by throwing (or returning a Promise rejected with) an instance of
functions.https.HttpsError
; - You need to correctly chain all the promises returned by the asynchronous methods.
I've tried below to re-organized your code in the lights of the points above, but since your business logic is complex I cannot test it and there might be other approaches to manage all the cases... Up to you to "polish" this first attempt! Hoping it will help.
QUESTION
Edit: Why this is not a duplicate: because Cypress, just read instead of tagging everything as duplicate.
Edit 2: Also, see answer for better understanding of the differences between usual async for
loops problems and this question.
I am writing cypress tests and I want to create a cypress command that populates my database with a list of users. I want the creation loop to wait for each user to be created before it moves on to the next one (because I want that done in a specific order).
For now, my loop looks like this:
...ANSWER
Answered 2018-Oct-12 at 12:46Turns out there is a reason why cypress is so restrictive about what you can do about waiting for async method to resolve: it always automatically runs all the async commands in sequential order, as they are called, not in parallel, so this will execute in the right order even if createUser
is Async :
QUESTION
I'm trying to think of the best way to format the code of a complicated decision tree while using javascript promises.
I've read the following questions but couldn't find what I'm looking for:
- How to create a tree of promises?
- How do I catch ES6 promise rejections and completely stop flow?
- Recursive promises to create tree
- 2ality : -Promise trees
My desires:
- The flow must be very easy to understand to new developers who'll enter the project in the future.
- Every action/step will be handled in an isolated function/promise, and could be replaced easily, and without having to test other steps again.
- The input should flow from each promise to the next.
A simple decision tree for example:
I thought about the following methods:
Method 1 ...ANSWER
Answered 2019-Sep-21 at 14:53Method 1 is a linear promise chain, its indentation is arbitrary and does not necessarily relate to your internal flow of control.
Method 2 is the correct way to go - that's how you do conditions in a promise chain. For better readability, use either a different indentation style and ternary operators
QUESTION
I wrote the below code snippet:
...ANSWER
Answered 2019-Aug-14 at 03:50You don't just blindly call resolve()
and reject()
inside a .then()
handler. Those functions are ONLY defined in a manually created promise so they don't exist in your context.
If you want to set the resolved value in .then()
handler, then just return
that value. If you want to reject inside a .then()
handler, then either throw someErr
or return
a rejected promise.
If you're inside a .forEach()
callback and you want to stop further processing and set the resolved value of the parent promise, you can't. You're inside a callback function so you can't directly return
from the outer function and .forEach()
has no way of stopping its iteration. Instead, use a regular for
loop and then you can just return value
to both end the for
loop iteration and to establish the resolved value of your promise chain. A regular for
loop gives you significantly more control over the program flow than a .forEach()
loop.
FYI, Unhandled rejection ReferenceError:
is caused by creating an exception inside your .catch()
by attempting to call an non-existing reject()
function. Remove that. If you want to log and keep the promise rejected, then throw
.
And, then if you use rp.get()
inside a for
loop, you will either need to use it with await
or Promise.all()
with it in order to know when everything is done.
QUESTION
I'm currently working in an environment with around 14+ stockCharts on a given page (each with 20,0000+ unique data points, some a lot more). I have certain global "toggles" that affect, for instance, which series are displayed, chart options, or axis extremes (on all charts). Given that only one chart is visible to the user at a time, I would like to treat the updating of charts like a Queue, where I update the one chart first, then another second, etc.
My goal: call Highcharts.Chart.redraw() sequentially in a loop (i.e., call redraw on each chart in the page, one at a time - so that the first chart in my list of charts is redrawn first). Note that the ordering of the list of charts is dynamically created and already taken care of.
BackgroundSo far I've read around a good amount about JavaScript promises, which I'ved used in the past for chaining ajax calls. As is discussed in the following links:
- Pass in an array of Deferreds to $.when()
- jQuery Deferred's, $.when() and the fail() callback arguments
- Wait until all jQuery Ajax requests are done?
- How can I wait for set of asynchronous callback functions?
I've also read some more general questions on here related to Promises in loops:
Code / DetailsI have tried numerous solutions, and believe the issue revolves around making the Highcharts redraw funcion - or the actions calling it (like Chart.update(), Series.setVisible(), Axis.setExtremes()) - return a promise.
I've uploaded something of a shell here which allows you to trigger an event, and see that each chart is essentially updated at once.
For instance, something like the following:
...ANSWER
Answered 2019-Mar-27 at 23:20If I understand what you mean, you can achieve it by wrapping the code you have in the trigger in a setTimeout (with a timeout value of 0), in turn wrapped in a new Promise
using async/await it would be something like
QUESTION
I am using C# Promises library for an Unity project, and I want to call a block of promise code indefinite times. Each time the promise is resolved it should decide whether it should be called again or not. I found this JavaScript solution for ES6 in the thread JavaScript ES6 promise for loop.
...ANSWER
Answered 2019-Feb-25 at 08:59First Define your function for 'then' separately. Then make sure your promise variable is accessible from the function. Finally, set your promise.then inside that function instead of outside.
This is an example in VB.net. (shouldn't be hard to change to c#)
QUESTION
I'm trying to query the places autocomplete api by google, using the following snippet
...ANSWER
Answered 2017-Sep-03 at 14:56The CORS headers are not set for Places API web service on Google backend servers. So you won't be able to call Places API web service from the client side JavaScript code due to the Same-Origin policy of the browsers.
In order to use Places on client side JavaScript you have to use a Places library of Google Maps JavaScript API. The places library has nearby and text search functionality, also autocomplete widget and service very similar to the corresponding web service.
For further details please have a look at the documentation:
https://developers.google.com/maps/documentation/javascript/places
Hope it helps!
QUESTION
This is tightly coupled to Chaining .then() calls in ES6 promises ...
I tried this with some functions that make up a chain of promises, so basically:
...ANSWER
Answered 2018-Mar-02 at 13:50you are using .then()
handler twice, do the following:
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