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Timeline for How do I return the response from an asynchronous call?

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Jan 26, 2023 at 19:29 comment added sootsnoot only used to make changes to the DOM, it doesn't need to set a value to be returned from the function making the ajax request.
Jan 26, 2023 at 19:26 comment added sootsnoot I asked a specific question about the jQuery validator plugin, which got an excellent answer. Basically, the interface for custom validation methods for that plugin requires that the method it calls return a boolean, and therefore the method cannot use ajax unless it specifies async: false. In order to avoid making a synchronous call, you must use the plugin's builtin remote method. That method can internally make an async call, because the result is (cont'd)
Jan 20, 2023 at 23:17 comment added sootsnoot The only solution I could come up with was to use the async: false option to $.ajax. And I have been roundly scolded for doing that because it is an anti-pattern, and referred to this post. But I cannot find a different solution in this post!
Jan 20, 2023 at 23:14 comment added sootsnoot This answer has lots of great information, but I don't think it has a solution to my problem. I'm using the jQuery validator plugin. The plugin has you call its addMethod() function to define a function that it will call on an input element whose name attribute you specify. The function you define must return true or false. But I need to use $.ajax to check with the server if a value is valid. So I need the method called by the validator to return the result of the $.ajax call. I don't have the option of passing in a function to my validator to be called on ajax completion. (cont'd)
Apr 26, 2022 at 21:47 comment added César Rodriguez The only thing I can see is: JavaScript is an enemy to clean code/architecture. As soon as you need to call anything returning a promise, bid farewell to any separation of concerns in your code: any such module or code will need to end up in a callback hell which ends up outputting data (whatever would be the now-toilet-flushed objective of the module or class, it will now obey the Single-Responsibility-Plus-Output Principle).
Apr 8, 2022 at 13:02 history edited Nick Parsons CC BY-SA 4.0
Updated note about being able to use `await` at the top-level of a module
Mar 21, 2022 at 9:15 history edited Christian Vincenzo Traina CC BY-SA 4.0
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Mar 21, 2022 at 9:15 comment added Christian Vincenzo Traina return await is a mistake and should always be avoided
Dec 31, 2021 at 9:43 comment added Felix Kling @Kadio: Not necessarily. An async function returns a promise, so you can also pass a callback to the promise's then method: asyncFunction().then(result => ...).
Dec 30, 2021 at 18:18 comment added Kadio So I must wrap the main function in an async function and then use await in order to get a value from an async function, right?
S May 7, 2021 at 10:09 history suggested Henke - Нава́льный П с м CC BY-SA 4.0
About adding stack snippets to a post - "If the snippet demonstrates the issue the OP is asking about when you click Run code snippet, approve. If not, reject". See https://meta.stackoverflow.com/a/348677.
May 7, 2021 at 7:08 review Suggested edits
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Apr 9, 2021 at 11:40 history edited Peter Mortensen CC BY-SA 4.0
Active reading.
Oct 6, 2020 at 10:05 history edited Harry B CC BY-SA 4.0
Simply is subjective. Code is hard.
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Jul 14, 2020 at 3:23 history edited Maxim Mazurok CC BY-SA 4.0
fixed grammar, updated links
S Nov 24, 2019 at 11:19 history suggested Reza Ramezanpour CC BY-SA 4.0
spell fixes
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Mar 3, 2019 at 17:28 history edited Skippy le Grand Gourou CC BY-SA 4.0
definition and link for IIFE
Dec 11, 2018 at 16:51 history edited 3limin4t0r CC BY-SA 4.0
(function) expressions should end with a semicolon
Dec 11, 2018 at 12:30 history edited mikemaccana CC BY-SA 4.0
You don't need to use .then() at the top level, make an IIFE.
Oct 11, 2018 at 11:07 history edited mikemaccana CC BY-SA 4.0
Mention 'await' is now current (not 'latest')
S Sep 28, 2018 at 2:17 history suggested Cavell Blood CC BY-SA 4.0
changed arrows to html entities
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Aug 27, 2018 at 11:15 history edited wake-0 CC BY-SA 4.0
Removed unused 1000ms and updated 1s comment, so that it is easier to follow.
Jun 13, 2018 at 12:51 history edited David Pine CC BY-SA 4.0
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May 15, 2018 at 10:37 history bounty ended user70960
Mar 1, 2018 at 1:03 history edited whackamadoodle3000 CC BY-SA 3.0
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S Dec 25, 2017 at 8:29 history suggested Farzad Karimi CC BY-SA 3.0
improved syntax
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S Oct 19, 2017 at 13:35 history suggested bravehart_sf CC BY-SA 3.0
added reference
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S Oct 18, 2017 at 8:33 history suggested Farzad Karimi CC BY-SA 3.0
improved syntax
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S Jun 25, 2017 at 20:23 history suggested meridius CC BY-SA 3.0
fixed typos
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Jun 12, 2017 at 11:31 history edited mikemaccana CC BY-SA 3.0
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Jun 12, 2017 at 11:15 history edited mikemaccana CC BY-SA 3.0
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Jun 12, 2017 at 11:01 history edited mikemaccana CC BY-SA 3.0
Move 'await' to top
Jun 2, 2017 at 16:48 history edited Felix Kling CC BY-SA 3.0
added information about async/await; some cleanup
May 23, 2017 at 11:55 history edited URL Rewriter Bot
replaced http://stackoverflow.com/ with https://stackoverflow.com/
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Dec 17, 2016 at 15:14 history rollback Makyen♦
Rollback to Revision 23
Dec 17, 2016 at 2:38 comment added Makyen♦ @MadaraUchiha:(cont) This is now seen by newbies as too specific and not applicable to their question (which could be for any async function, not just $.ajax()). $.ajax() is just used as an example of the more general issue. Note that I am only here at this question/answer now because what I describe as the response newbies is what has happened when I suggested this as a dup target on a question. If you were not a moderator, I would just revert the edit while we discuss it, but I don't want to, potentially, get into a rollback contest with a moderator.
Dec 17, 2016 at 2:38 comment added Makyen♦ @MadaraUchiha, I strongly disagree with your recent edit (the large TL;DR: Use Promises). This question is a dup target for a large number of general async-issue questions (how to return a variable). Putting that code/info at the start is confusing to the people who we are telling this is a duplicate of their problem. The code you provided only shows how to use the Promise that is auto-returned by jQuery's $.ajax() when you don't provide a callback. You have changed a general purpose answer into one which is now only specific to $.ajax(), or functions which auto-return a Promise.(cont)
Dec 16, 2016 at 9:18 history edited Madara's Ghost CC BY-SA 3.0
Add TLDR.
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S Aug 25, 2016 at 14:04 history suggested mhelvens CC BY-SA 3.0
fixed "their" + neutral change to overcome 6 character limit
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Mar 8, 2016 at 22:16 history edited Alvin Thompson CC BY-SA 3.0
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S Jan 16, 2016 at 13:00 history suggested Jed Fox CC BY-SA 3.0
Added caniuse link for Promises.
Jan 16, 2016 at 11:48 review Suggested edits
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Nov 21, 2015 at 12:17 history edited Peter Mortensen CC BY-SA 3.0
Copy edited (e.g. ref. <http://en.wikipedia.org/wiki/Ajax_%28programming%29>).
Oct 14, 2015 at 14:33 history edited ThiefMaster CC BY-SA 3.0
fix typo
Oct 8, 2015 at 17:44 comment added Felix Kling @Jessi: I think you misunderstood that part of the answer. You cannot use $.getJSON if you want the Ajax request to be synchronous. However, you should not event want the request to be synchronous, so that doesn't apply. You should be using callbacks or promises to handle the response, as it is explained earlier in the answer.
Jul 31, 2015 at 2:30 history edited Felix Kling CC BY-SA 3.0
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Jun 24, 2015 at 8:29 history edited Bergi CC BY-SA 3.0
avoid the [promise constructor antipattern](http://stackoverflow.com/q/23803743/1048572) (with native xhr, not using `Promise.resolve` on `$.ajax(…)`). Though maybe we should move that complete section to Benjamins "no jQuery" answer.
May 27, 2015 at 14:41 history edited Trott CC BY-SA 3.0
small but important typo fix
May 19, 2015 at 17:28 history edited Felix Kling CC BY-SA 3.0
Gave promises their own section; moved "synchronous Ajax" to the bottom
Jan 26, 2015 at 8:48 review Suggested edits
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Oct 10, 2014 at 20:25 history edited Felix Kling CC BY-SA 3.0
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Jan 8, 2014 at 20:40 history bounty ended apsillers
S Jan 8, 2014 at 14:52 history suggested scniro CC BY-SA 3.0
adding some block code formatting within explanations
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Dec 13, 2013 at 23:56 history edited megawac CC BY-SA 3.0
minor fix to `xhr.open` - async is third param
S Oct 24, 2013 at 15:28 history suggested Venkata Krishna CC BY-SA 3.0
Spelling correction - responseText
Oct 24, 2013 at 15:25 review Suggested edits
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Apr 16, 2013 at 2:45 comment added Chris Moschini The Chat for this question is dead so I'm not sure where to propose outlined changes, but I propose: 1) Change the synchronous part to a simple discussion of why it's bad with no code example of how to do it. 2) Remove/merge the callback examples to only show the more flexible Deferred approach, which I think may also be a little easier to follow for those learning Javascript.
Apr 16, 2013 at 2:19 history edited Chris Moschini CC BY-SA 3.0
Added an example of turning synchronous bad assumptions into asynchronous valid code
Feb 6, 2013 at 23:34 history edited Felix Kling CC BY-SA 3.0
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Feb 6, 2013 at 23:29 comment added Felix Kling @gibberish: Mmmh, I don't know how it can be made clearer. Do you see how foo is called and a function is passed to it (foo(function(result) {....});)? result is used inside this function and is the response of the Ajax request. To refer to this function, the first parameter of foo is called callback and assigned to success instead of an anonymous function. So, $.ajax will call callback when the request was successful. I tried to explain it a bit more.
Feb 6, 2013 at 21:56 history edited Felix Kling CC BY-SA 3.0
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Feb 6, 2013 at 21:07 comment added cssyphus In Solution 1, sub jQuery, I could not understand this line: If you use any other jQuery AJAX method, such as $.get, $.getJSON, etc., you have them to $.ajax. (Yes, I realize my nick is a tad ironic in this case)
Jan 21, 2013 at 14:33 history edited Felix Kling CC BY-SA 3.0
some minor restructuring
Jan 19, 2013 at 13:46 history edited Felix Kling CC BY-SA 3.0
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Jan 19, 2013 at 13:25 history edited Felix Kling CC BY-SA 3.0
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Jan 17, 2013 at 15:10 history edited Felix Kling CC BY-SA 3.0
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Jan 17, 2013 at 11:10 history edited Felix Kling CC BY-SA 3.0
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Jan 17, 2013 at 11:07 vote accept Felix Kling
Jan 17, 2013 at 10:47 comment added Felix Kling @Pommy: If you want to use jQuery, you have to include it. Please refer to docs.jquery.com/Tutorials:Getting_Started_with_jQuery.
Jan 9, 2013 at 12:07 history edited Felix Kling CC BY-SA 3.0
some more details
Jan 8, 2013 at 17:14 history wiki removed casperOne
Jan 8, 2013 at 17:06 history answered Felix Kling CC BY-SA 3.0
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