About Promises and Complex Code Flow
Use JavaScript promises for time-consuming asynchronous tasks.
Here is an example of a default promise call:
function get_results(params) {
return new Promise(function(resolve, reject) {
/*
Here go logical operations or tasks that call
resolve(data); on success
or
reject('Error message.'); on errors
*/
});
}
And here is an example of less nested alternative:
function get_results(params) {
let deferred = null;
let promise = new Promise(function(resolve, reject) {
deferred = {resolve: resolve, reject: reject};
});
/*
Here go logical operations or tasks that call
deferred.resolve(data); on success
or
deferred.reject('Error message.'); on errors
*/
return promise;
}
Then you can use the promise as follows:
get_results({query: 'DjangoTricks', page: 2}).then(data => {
console.log(data);
}).catch(err => {
console.log(err);
});
The then() handling function is triggered, when the promise is resolved. The catch() handling function is triggered, when the promise is rejected.
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