Can't view anything inside promise resolution

@burbians wrote:

I have a method which returns a promise like:

checkLogin(credentials) {
        return new Promise((resolve, reject) => {
            this.http.post(url, credentials)
                .map(res => res.json())
                .subscribe(
                data => {
                    resolve(data);
                },
                err => {
                    reject(err);
                }
            );
        });
    }

I call this method inside another:

login(credentials) {
        this.checkLogin(credentials)
            .then(function(result) {
                console.log("ok: ",result);
                this.doAlert("ok");
            })
            .catch(function(err) {
                console.log("error: ",err.message);
                this.doAlert(err.message)
            });
}

Here is where the error happens, it is said "TypeError: this.doAlert is not a function":

But the doAlert is in the same file than the others, and it works fine from other places (not promises calls)

   doAlert(text) {
        let alert = Alert.create({
            title: 'Alert;,
            subTitle: text,
            buttons: ['Ok']
        });
        this.nav.present(alert);
    }

Is it not possible to do this?

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