searching query to mysql in angularjs using ng-keyup but $http only after 3 seconds

Question

I want to make online search in angularjs, using ng-keyup function. But I suppose that it is wrong to make query to BD on each keyup. So how can I set timer that will make $http service work only if in last 3 second there were no keyups?

<input type="text" ng-keyup="search(param.values, param.url)">

JS:

app.controller('searchCtrl', function($scope,$rootScope,$http){
$scope.search = function( values , type) {
    var data={};
    data.values=values;
    data.type=type;
    console.log(data);
    $http.post("search.php", data).then(function success (response) {
            console.log(response.data);
            $rootScope.search_result=response.data;
        },function error (response){
            console.log(response.data);
        }
    );
};
});

Answer 1

You could use ng-model-options to debounce your input value which will tell angular to update ng-model to update after a particular amount of time. Then switch to ng-change event would make more sense instead of ng-keyup . In short, we use debounce to delay our API call.

<input type="text" ng-model="value" ng-change="search(param.values, param.url)" 
  ng-model-options="{ debounce: 3000 }"

Answer 2

Waiting for a few seconds in a search module is not very ergonomic / user friendly.

What we usually do is cancel the previous request each time a new character is entered by the user.

You can do this by passing a promise to the timeout property of you $http request.

$http.get(request, {timeout: promise}).then...

You initialise the promise at the start of your search function:

abort = $q.defer();

This way, each time the function is called, you can check if there's a promise and resolve it (cancel it) before making a new request.

if(abort) {
  abort.resolve();
}

Check out the working plunker . (and open the console to see requests being cancelled as you type.)