I'm trying to grasp the contrast between the then callback and success callback in relation to using http get. With the then callback, data is returned, whereas with the success callback it isn't. Here's an example of the code:
Using Then Callback
$http.get(url).
then(function(response) {
response.data.data;});
Using Success Callback
$http.get(url).
success(function(response) {
response.data;});
It appears that the issue revolves around this particular code snippet:
$http.get('/someUrl'). success(function(data, status, headers, config) {
There is a distinct difference between using success and then,
The
thenmethod is used to register callbacks, with each callback receiving an object representing the response
In essence, you should be approaching it in this manner:
$http.get(...).success(function(data){ console.log(data) })
$http.get(...).then(function(response){ console.log(response.data) })
Furthermore, there are chaining distinctions, although they may not be directly related to your current problem:
then()When chaining then(), the callbacks will execute sequentially one after the other due to the return of a new promise object on each chain
success() (deprecated* alongside error())If you chain success() calls, the callbacks will run in parallel as it returns the original promise object
*Both success and error are deprecated features, refer to the Deprecation Notice section in the $http documentation
When utilizing promises in JavaScript, you have the option of using either .then() or .success(), with the specific callback code varying depending on which method you choose.
The .then() method takes two arguments - the success handler and the error handler. The success handler within .then() can also be written as .success(). The primary difference between the success handler inside .then() and the .success() function is that .success() accepts four arguments (data, status, headers, config), whereas the success handler in .then() only receives one argument containing all those values embedded within it (for example: response.data, response.status, etc...).
A vital suggestion from the site angularjs.org:
The legacy promise functions success and error in $http have been outdated. It is now recommended to use the standard then method instead. In case
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