Array adds undefined element, angular 6
I have a problem with an array that is supposed to be empty, the problem is that it is not, and it has an undefined element inside so it does not allow me to query the backend correctly.
this is the component with problem and the console log:
export class AvailabilityVerifierComponent implements OnInit {
usersAvailabilities: UserAvailability = ;
users: Array<User> = ;
@Input()
set userToVerify(user: User){
console.log('users array in input');
console.log(this.users);
console.log('User en AvailabilityVerifierComponent');
console.log(user);
console.log('users componente after push ');
console.log(this.users);
this.users.push(user);
console.log('users componente before push ');
console.log(this.users);
this.verifyAvailabilitiesService.verify(this.users)
.subscribe(
response => {
this.usersAvailabilities = response;
},
error => {
console.log(error);
}
);
}
constructor(
private verifyAvailabilitiesService: VerifyAvailabilitiesService
) { }
ngOnInit() {
}
}
arrays angular angular6
asked Nov 21 '18 at 15:34
kmilo93sdkmilo93sd
89110
add a comment |
I have a problem with an array that is supposed to be empty, the problem is that it is not, and it has an undefined element inside so it does not allow me to query the backend correctly.
this is the component with problem and the console log:
export class AvailabilityVerifierComponent implements OnInit {
usersAvailabilities: UserAvailability = ;
users: Array<User> = ;
@Input()
set userToVerify(user: User){
console.log('users array in input');
console.log(this.users);
console.log('User en AvailabilityVerifierComponent');
console.log(user);
console.log('users componente after push ');
console.log(this.users);
this.users.push(user);
console.log('users componente before push ');
console.log(this.users);
this.verifyAvailabilitiesService.verify(this.users)
.subscribe(
response => {
this.usersAvailabilities = response;
},
error => {
console.log(error);
}
);
}
constructor(
private verifyAvailabilitiesService: VerifyAvailabilitiesService
) { }
ngOnInit() {
}
}
arrays angular angular6
asked Nov 21 '18 at 15:34
kmilo93sdkmilo93sd
89110
2
change users: Array<User> = in users: User; in theonInit-> this.users = ; and do a console.log(this.user). Is empty?
– Jacopo Sciampi
Nov 21 '18 at 15:37
now is empty, cool. but angular now it shows me an error when executing the input function because it can not use the .push method in undefined. After I add a user this is solved, but before that the error is present.
– kmilo93sd
Nov 21 '18 at 15:45
add a comment |
I have a problem with an array that is supposed to be empty, the problem is that it is not, and it has an undefined element inside so it does not allow me to query the backend correctly.
this is the component with problem and the console log:
export class AvailabilityVerifierComponent implements OnInit {
usersAvailabilities: UserAvailability = ;
users: Array<User> = ;
@Input()
set userToVerify(user: User){
console.log('users array in input');
console.log(this.users);
console.log('User en AvailabilityVerifierComponent');
console.log(user);
console.log('users componente after push ');
console.log(this.users);
this.users.push(user);
console.log('users componente before push ');
console.log(this.users);
this.verifyAvailabilitiesService.verify(this.users)
.subscribe(
response => {
this.usersAvailabilities = response;
},
error => {
console.log(error);
}
);
}
constructor(
private verifyAvailabilitiesService: VerifyAvailabilitiesService
) { }
ngOnInit() {
}
}
arrays angular angular6
asked Nov 21 '18 at 15:34
kmilo93sdkmilo93sd
89110
I have a problem with an array that is supposed to be empty, the problem is that it is not, and it has an undefined element inside so it does not allow me to query the backend correctly.
this is the component with problem and the console log:
export class AvailabilityVerifierComponent implements OnInit {
usersAvailabilities: UserAvailability = ;
users: Array<User> = ;
@Input()
set userToVerify(user: User){
console.log('users array in input');
console.log(this.users);
console.log('User en AvailabilityVerifierComponent');
console.log(user);
console.log('users componente after push ');
console.log(this.users);
this.users.push(user);
console.log('users componente before push ');
console.log(this.users);
this.verifyAvailabilitiesService.verify(this.users)
.subscribe(
response => {
this.usersAvailabilities = response;
},
error => {
console.log(error);
}
);
}
constructor(
private verifyAvailabilitiesService: VerifyAvailabilitiesService
) { }
ngOnInit() {
}
}
arrays angular angular6
arrays angular angular6
asked Nov 21 '18 at 15:34
kmilo93sdkmilo93sd
89110
asked Nov 21 '18 at 15:34
kmilo93sdkmilo93sd
89110
asked Nov 21 '18 at 15:34
kmilo93sdkmilo93sd
89110
asked Nov 21 '18 at 15:34
kmilo93sdkmilo93sd
89110
asked Nov 21 '18 at 15:34
kmilo93sdkmilo93sd
89110
89110
2
change users: Array<User> = in users: User; in theonInit-> this.users = ; and do a console.log(this.user). Is empty?
– Jacopo Sciampi
Nov 21 '18 at 15:37
now is empty, cool. but angular now it shows me an error when executing the input function because it can not use the .push method in undefined. After I add a user this is solved, but before that the error is present.
– kmilo93sd
Nov 21 '18 at 15:45
add a comment |
2
change users: Array<User> = in users: User; in theonInit-> this.users = ; and do a console.log(this.user). Is empty?
– Jacopo Sciampi
Nov 21 '18 at 15:37
now is empty, cool. but angular now it shows me an error when executing the input function because it can not use the .push method in undefined. After I add a user this is solved, but before that the error is present.
– kmilo93sd
Nov 21 '18 at 15:45
2
2
change users: Array<User> = in users: User; in the
onInit -> this.users = ; and do a console.log(this.user). Is empty?– Jacopo Sciampi
Nov 21 '18 at 15:37
change users: Array<User> = in users: User; in the
onInit -> this.users = ; and do a console.log(this.user). Is empty?– Jacopo Sciampi
Nov 21 '18 at 15:37
now is empty, cool. but angular now it shows me an error when executing the input function because it can not use the .push method in undefined. After I add a user this is solved, but before that the error is present.
– kmilo93sd
Nov 21 '18 at 15:45
now is empty, cool. but angular now it shows me an error when executing the input function because it can not use the .push method in undefined. After I add a user this is solved, but before that the error is present.
– kmilo93sd
Nov 21 '18 at 15:45
add a comment |
1 Answer
1
active
oldest
votes
Your console log sadly changes over time; it gets revaluated. There is no way your initial array has one undefined element in it. What happens here is that when your component is initialized, the input is called with undefined as a parameter. Thus you push "undefined" into your array. Change the this.users.push(user) into
if (user) {
this.users.push(user);
}
and you should be all set; except your server will be called twice. You might just want to add:
if (!user) {
return;
}
to the top of your userToVerify method.
answered Nov 21 '18 at 15:45
ArneArne
551212
this has solved the problem correctly, thank you very much for the help.
– kmilo93sd
Nov 21 '18 at 15:50
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 console log sadly changes over time; it gets revaluated. There is no way your initial array has one undefined element in it. What happens here is that when your component is initialized, the input is called with undefined as a parameter. Thus you push "undefined" into your array. Change the this.users.push(user) into
if (user) {
this.users.push(user);
}
and you should be all set; except your server will be called twice. You might just want to add:
if (!user) {
return;
}
to the top of your userToVerify method.
answered Nov 21 '18 at 15:45
ArneArne
551212
this has solved the problem correctly, thank you very much for the help.
– kmilo93sd
Nov 21 '18 at 15:50
add a comment |
Your console log sadly changes over time; it gets revaluated. There is no way your initial array has one undefined element in it. What happens here is that when your component is initialized, the input is called with undefined as a parameter. Thus you push "undefined" into your array. Change the this.users.push(user) into
if (user) {
this.users.push(user);
}
and you should be all set; except your server will be called twice. You might just want to add:
if (!user) {
return;
}
to the top of your userToVerify method.
answered Nov 21 '18 at 15:45
ArneArne
551212
this has solved the problem correctly, thank you very much for the help.
– kmilo93sd
Nov 21 '18 at 15:50
add a comment |
Your console log sadly changes over time; it gets revaluated. There is no way your initial array has one undefined element in it. What happens here is that when your component is initialized, the input is called with undefined as a parameter. Thus you push "undefined" into your array. Change the this.users.push(user) into
if (user) {
this.users.push(user);
}
and you should be all set; except your server will be called twice. You might just want to add:
if (!user) {
return;
}
to the top of your userToVerify method.
answered Nov 21 '18 at 15:45
ArneArne
551212
Your console log sadly changes over time; it gets revaluated. There is no way your initial array has one undefined element in it. What happens here is that when your component is initialized, the input is called with undefined as a parameter. Thus you push "undefined" into your array. Change the this.users.push(user) into
if (user) {
this.users.push(user);
}
and you should be all set; except your server will be called twice. You might just want to add:
if (!user) {
return;
}
to the top of your userToVerify method.
answered Nov 21 '18 at 15:45
ArneArne
551212
answered Nov 21 '18 at 15:45
ArneArne
551212
answered Nov 21 '18 at 15:45
ArneArne
551212
answered Nov 21 '18 at 15:45
ArneArne
551212
551212
this has solved the problem correctly, thank you very much for the help.
– kmilo93sd
Nov 21 '18 at 15:50
add a comment |
this has solved the problem correctly, thank you very much for the help.
– kmilo93sd
Nov 21 '18 at 15:50
this has solved the problem correctly, thank you very much for the help.
– kmilo93sd
Nov 21 '18 at 15:50
this has solved the problem correctly, thank you very much for the help.
– kmilo93sd
Nov 21 '18 at 15:50
add a comment |
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2
change users: Array<User> = in users: User; in the
onInit-> this.users = ; and do a console.log(this.user). Is empty?– Jacopo Sciampi
Nov 21 '18 at 15:37
now is empty, cool. but angular now it shows me an error when executing the input function because it can not use the .push method in undefined. After I add a user this is solved, but before that the error is present.
– kmilo93sd
Nov 21 '18 at 15:45