Recently, I've delved into the realm of Angular promises for fetching data from a web service. One intriguing aspect that has caught my interest is how Angular somehow has the capability to determine whether a "request" has been successfully fulfilled or rejected. But the question remains: How exactly does Angular possess this knowledge? Does it simply check the response status code, or are there other rules at play that redefine this behavior?
I came across a fantastic explanation of Promises in AngularJS on this blog. It really helped me understand the concept better.
The analogy used in the article compares Promises in AngularJS to a father asking his son to get the weather forecast. The son promises to return with the forecast, allowing the father to continue with his tasks without being blocked. This analogy perfectly illustrates the concept of promises being resolved later on.
According to the article, Angular's then() function is used to determine the actions to be taken based on the outcome of the promise. It takes two functions as parameters: one for when the promise is fulfilled and another for when it is rejected.
// A function from father-controller.js var makePromiseWithSon = function() { // This function returns a promise from SonService.getWeather() SonService.getWeather() // then() is called when the son returns .then(function(data) { // If the forecast is good, prepare for a fishing trip if (data.forecast==='good') { prepareFishingTrip(); } else { // If not, prepare a Sunday roast dinner prepareSundayRoastDinner(); } }, function(error) { // If the promise is rejected, prepare a Sunday roast dinner as well prepareSundayRoastDinner(); }); };
Indeed, your assumption is spot on!
When it comes to the HttpProvider, like the one utilized by $http and $resource, it interprets a successful response as an http response code falling within the range of 200 to 299, both numbers included.
If you wish to alter this default behavior, you can do so by providing your own customized HttpProvider. Moreover, keep in mind that services depending on the HttpProvider have the ability to override this default response and substitute their own criteria for determining success or failure.
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