Computed property whose value results from an API call
An API call (Firebase) determines the return value of my computed property and hence whether I display certain elements in my template.
Yet, my computed property is actually not reactive: its value in my template doesn't change upon the API call. Why not?
JS:
myComputedProperty: function() {
firebase.auth().onAuthStateChanged(function(user) {
if (user) {
return true;
}
else {
return false;
}
});
}
Template:
<span v-if="userConnected">
User connected
</span>
javascript vue.js computed-properties
edited Nov 13 '18 at 18:33
Bhojendra Rauniyar
50.8k2079125
asked Nov 13 '18 at 18:13
drake035drake035
489124198
add a comment |
An API call (Firebase) determines the return value of my computed property and hence whether I display certain elements in my template.
Yet, my computed property is actually not reactive: its value in my template doesn't change upon the API call. Why not?
JS:
myComputedProperty: function() {
firebase.auth().onAuthStateChanged(function(user) {
if (user) {
return true;
}
else {
return false;
}
});
}
Template:
<span v-if="userConnected">
User connected
</span>
javascript vue.js computed-properties
edited Nov 13 '18 at 18:33
Bhojendra Rauniyar
50.8k2079125
asked Nov 13 '18 at 18:13
drake035drake035
489124198
add a comment |
An API call (Firebase) determines the return value of my computed property and hence whether I display certain elements in my template.
Yet, my computed property is actually not reactive: its value in my template doesn't change upon the API call. Why not?
JS:
myComputedProperty: function() {
firebase.auth().onAuthStateChanged(function(user) {
if (user) {
return true;
}
else {
return false;
}
});
}
Template:
<span v-if="userConnected">
User connected
</span>
javascript vue.js computed-properties
edited Nov 13 '18 at 18:33
Bhojendra Rauniyar
50.8k2079125
asked Nov 13 '18 at 18:13
drake035drake035
489124198
An API call (Firebase) determines the return value of my computed property and hence whether I display certain elements in my template.
Yet, my computed property is actually not reactive: its value in my template doesn't change upon the API call. Why not?
JS:
myComputedProperty: function() {
firebase.auth().onAuthStateChanged(function(user) {
if (user) {
return true;
}
else {
return false;
}
});
}
Template:
<span v-if="userConnected">
User connected
</span>
javascript vue.js computed-properties
javascript vue.js computed-properties
edited Nov 13 '18 at 18:33
Bhojendra Rauniyar
50.8k2079125
asked Nov 13 '18 at 18:13
drake035drake035
489124198
edited Nov 13 '18 at 18:33
Bhojendra Rauniyar
50.8k2079125
asked Nov 13 '18 at 18:13
drake035drake035
489124198
edited Nov 13 '18 at 18:33
Bhojendra Rauniyar
50.8k2079125
edited Nov 13 '18 at 18:33
Bhojendra Rauniyar
50.8k2079125
edited Nov 13 '18 at 18:33
Bhojendra Rauniyar
50.8k2079125
50.8k2079125
asked Nov 13 '18 at 18:13
drake035drake035
489124198
asked Nov 13 '18 at 18:13
drake035drake035
489124198
asked Nov 13 '18 at 18:13
drake035drake035
489124198
489124198
add a comment |
add a comment |
1 Answer
1
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oldest
votes
Your return value isn't the return value for your computed property. It's the return value of the callback function.
You should be using data() and created() or mounted() to check this instead:
data () {
return {
isAuthenticated: false
};
},
created () {
firebase.auth().onAuthStateChanged((user) => {
this.isAuthenticated = !!user
});
}
answered Nov 13 '18 at 18:17
BrianBrian
3,2111225
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Your return value isn't the return value for your computed property. It's the return value of the callback function.
You should be using data() and created() or mounted() to check this instead:
data () {
return {
isAuthenticated: false
};
},
created () {
firebase.auth().onAuthStateChanged((user) => {
this.isAuthenticated = !!user
});
}
answered Nov 13 '18 at 18:17
BrianBrian
3,2111225
add a comment |
Your return value isn't the return value for your computed property. It's the return value of the callback function.
You should be using data() and created() or mounted() to check this instead:
data () {
return {
isAuthenticated: false
};
},
created () {
firebase.auth().onAuthStateChanged((user) => {
this.isAuthenticated = !!user
});
}
answered Nov 13 '18 at 18:17
BrianBrian
3,2111225
add a comment |
Your return value isn't the return value for your computed property. It's the return value of the callback function.
You should be using data() and created() or mounted() to check this instead:
data () {
return {
isAuthenticated: false
};
},
created () {
firebase.auth().onAuthStateChanged((user) => {
this.isAuthenticated = !!user
});
}
answered Nov 13 '18 at 18:17
BrianBrian
3,2111225
Your return value isn't the return value for your computed property. It's the return value of the callback function.
You should be using data() and created() or mounted() to check this instead:
data () {
return {
isAuthenticated: false
};
},
created () {
firebase.auth().onAuthStateChanged((user) => {
this.isAuthenticated = !!user
});
}
answered Nov 13 '18 at 18:17
BrianBrian
3,2111225
answered Nov 13 '18 at 18:17
BrianBrian
3,2111225
answered Nov 13 '18 at 18:17
BrianBrian
3,2111225
answered Nov 13 '18 at 18:17
BrianBrian
3,2111225
3,2111225
add a comment |
add a comment |
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