I have encountered a unique problem. I need to retrieve some data downloaded via ajax and return it, but neither async nor sync modes are fetching the data in time for the return. Is there a way to call the return from a child function to the parent function, or could using a timeout resolve the issue? I am struggling to find an alternative solution, but returning the data is essential.
A possible solution is to implement a callback function:
function parent(callbackFunction) {
callbackFunction(retrieveDataFromAjax());
}
function child() {
parent(function(dataFromAjax) {
//Perform actions with the data
});
}
Sorry, but the answer to your question is no.
When dealing with asynchronous requests, functions must return before the result can be accessed. To address this issue, a callback pattern is often used - instead of expecting a return value from a function, you provide it with a callback function that will be executed once the result is available.
Let's take a look at a basic example:
var someValue;
fetchValueFrom('http://example.com/some/url/with/value', function(val) {
someValue = val;
doSomethingElseWith(someValue);
});
In this code snippet, we define a function and pass it as a callback to the fetchValueFrom function. When the value is retrieved, this callback function will be triggered, setting the variable and executing another function to continue the program flow.
To make a synchronous query, simply provide false as the third parameter when calling the XMLHttpRequest.open method.
For more information, you can check out the official documentation.
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