Guarantee the correct sequence of following HTTP ajax requests within AngularJS

Imagine a basic search form with autocomplete that triggers a $http.get() request on keyup/keypress:

<input type="text" ng-model="keyword" ng-change="makeRequest()">

and

$scope.makeRequest = function() {
   $http.get(url).then(function(res) {
      // update the auto-suggest list here.
   });
}

How can we ensure that the responses are displayed in the correct order? Sometimes, due to fluctuating latency, earlier results may appear later, causing confusion for users. I'm looking for a solution that goes beyond a simple debounce to prevent multiple requests within a short keystroke interval.

Answer №1

To effectively manage requests, it's important to only consider responses that pertain to the most recent request...

let newestRequest = 0;
$scope.sendRequest = function() {
   let currentRequest = ++newestRequest;
   $http.get(url).then(function(response) {
      if (currentRequest === newestRequest) {
        // update the information accordingly
      }
   });
}

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