AngularJs : $http chaining

Question

I have these two functions and this is a sample of code

var getRangeTime = function(numSerie){
      $http.get("data/tempsgammes.json").then(function(res){
          return $scope.time = res.data[numSerie].temps
    })}

var updateScreen = function() {
      $http.get("http://localhost:5000").then(function(response){
        $scope.numSerie = response.data.refDetail.Num_Serie
        $scope.numTeam = response.data.team
        $scope.t = getRangeTime($scope.numSerie)
        //Rest of code the code
    }

Here what I want to do :

First of all, I call the function updateScreen() to get the Serial Number (numSerie), then depending on the value of numSerie, another function getRangeTime() will be exectued to get the time, and then the function updateScreen() will continue her execution using the result of getRangeTime().

The problem here is the asynchronous, I mean the updateSreen() should wait getRangeTime() until she returns the desired value, it's kind of async and await.

I've tried it but it didn't work and actually I don't know how to use them very much, I searched here and I tried the existing solutions but it didn't go well too, I got always the undefined.

Can anyone help me ?

Sajeetharan · Accepted Answer · 2017-08-21 02:39:22Z

2

In this case you should use promise chains to call the request one after the other.

function updateScreen(){
    return $http.get("http://localhost:5000")
}

function getRangeTime(){
   return  $http.get("data/tempsgammes.json")
}

$scope.calltwoFunctions = function() {
     updateScreen()
       .then( function( response )
        {
            $scope.numSerie = response.data.refDetail.Num_Serie
            $scope.numTeam = response.data.team
            return getRangeTime();
        })
        .then(function(response){
           console.log(response.data);
        })
}

answered Aug 21, 2017 at 2:39

Sajeetharan

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1 Comment

Anes El Gongi Over a year ago

okay thank you so much, i'll try it and then I will comment another time.

reedb89 · Accepted Answer · 2017-08-22 17:46:44Z

0

A little late here but you can also use callbacks(I haven't tested this but it should work):

var updateScreen = function(callback) {
   $http.get("http://localhost:5000").then(function(response){
        $scope.numSerie = response.data.refDetail.Num_Serie
        $scope.numTeam = response.data.team
        $scope.t = getRangeTime($scope.numSerie)
        callback($scope.numSerie);
    }
}

updateScreen(function(numSerie) {
   $http.get("data/tempsgammes.json").then(function(res){
          return $scope.time = res.data[numSerie].temps
    }
})

edited Aug 22, 2017 at 17:46

answered Aug 21, 2017 at 20:47

reedb89

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2 Comments

Anes El Gongi Over a year ago

Thank you so much for your answer, I tried the solution provided by @Sajeetharan and it works.I'll try yours in another time. But I have a question related to "Sajeetharan" if you can answer it, after calling return getRangeTime(); I complete the rest of the code in the second response, isn't it ?

reedb89 Over a year ago

@AnesElGongi Yes, by the looks of it, that would be my understanding as well.

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