Issue with VueJS method not properly updating data variable

I'm currently utilizing the below code snippet to retrieve the zip code (pin code) of visitors using the HTML5 geolocation API. However, I have a requirement to extract this zip code and store it in a data variable named 'pincode'. Although the code successfully prints the value in the console, it fails to update the 'pincode' variable.

export default {
    data(){
        return {
            pincode: 0,
        }
    },
    methods: {
        findPincode(){
            navigator.geolocation.getCurrentPosition(function (position) {
                var geocoder = new google.maps.Geocoder();
                var latLng   = new google.maps.LatLng(
                    position.coords.latitude, position.coords.longitude);
                geocoder.geocode({
                    'latLng': latLng
                }, function (results, status) {
                    for (var i = 0; i < results[0].address_components.length; i++) {
                        var address = results[0].address_components[i];
                        if (address.types[0] == "postal_code") {
                            console.log(address.long_name) // prints 680001
                            this.pincode = Number(address.long_name) // not working
                        }
                    }
                });
            });
        }    
    }
}

Answer №1

The reason for the issue is that you have lost the context of this within your geocoder.geocode function.

let self = this
geocoder.geocode({
   'latLng': latLng
}, function (results, status) {
    for (var i = 0; i < results[0].address_components.length; i++) {
       var address = results[0].address_components[i];
       if (address.types[0] == "postal_code") {
          console.log(address.long_name) // prints 680001
          self.pincode = Number(address.long_name) // not functioning correctly
       }
   }
});

By including the line above, the problem should be resolved.

Answer №2

One alternative to using the function() syntax is to implement an arrow function. Arrow functions do not have their own bindings for this, arguments, super, or new.target., like shown below:

geocoder.geocode({
   'latLng': latLng
}, (results, status) => {
    for (var i = 0; i < results[0].address_components.length; i++) {
       var address = results[0].address_components[i];
       if (address.types[0] == "postal_code") {
          console.log(address.long_name) // prints 680001
          this.pincode = Number(address.long_name) // doesn't work as expected
       }
   }
});

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