how can i return data from this.$http.get in vue js

Question

Hi I'm having problem in returning a data in my ajax call using vue js in laravel 5. I have an array of state and call the function of ajax inside the loop. The problem now is it seems that the ajax cannot returned a value. here's my code:

ready: function() {

    var dData = {};

    for (var i=0; i<this.pState.selectedState.length; i++){
        dData = this.displayCounty(this.pState.selectedState[i])
    }
    console.log(dData);

},
methods:{

    displayCounty: function(val){
        var nData = {};

        // ajax get County list
        this.$http.get('/api/counties/' + val )
            .success(function(counties){
               return counties;
            })
            .error(function(){

            }) //ajaxcall

    }// displaCounty
}

any idea guys?

Solution 1

If you just want to assign the returned results to a variable then try this:

ready: function() {
    this.getCounties;
},

data: {
    counties: []
},

methods:{

    getCounties: function(val){

        // ajax get County list
        this.$http.get('/api/counties/' + val )
            .success(function(counties){
               this.counties = counties;
            })
            .error(function(){

            }); //ajaxcall

    } // displayCounty
}

Solution 2

I think you are misunderstanding the asynchronous nature of $http.get. The return you have of return counties is not going to effect the return value of displayCounty. displayCounty returns null immediately and the return counties later ends up doing nothing.

A good strategy to use in this case is to have the success callback set counties on the View Model. Then you can setup a watcher on counties and process the data whenever it changes.

Comments

[user3814670]

What I did is assign this to a new variable like "var self = this" then in ajax i just assign the countries to self.countries and I can now get the values.

[Set Kyar Wa Lar]

How about, if I don't want to assign that result to countries data?