Angular 7 - Dynamic Forms and passing a function through
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Using Angular's Dynamic forms I'm building a new input field
form.ts
usernameCallback(body) {
console.log(`hello ${body}`);
this.usernameService.post(body)
.subscribe(
data => {
console.log(data);
},
error => {
console.warn(`Error: ${error}`);
}
);
}
ngOnInit() {
new InputField({
key: 'username',
label: 'Username',
value: '',
placeholder: 'Enter username',
required: true,
callback: this.usernameCallback
}),
}
So this is the basics of the code.
I have inside UsernameService a method post() which sends an http post request.
usernameCallback() is added to the InputField and has the type of Function to it.
Within input.component.ts where the form is built I am doing
callback() {
console.log(this.field.callback);
this.field.callback('cheddar');
}
The console log prints out the content from usernameCallback which is fine but I get an error
ERROR TypeError: Cannot read property 'post' of undefined
It looks like it isn't able to process the usernameService but I cannot figure out why.
angular angular7 edited Nov 29 '18 at 17:03
Goncalo Peres
1,4771721
asked Nov 22 '18 at 18:00
ngDoughngDough
659
add a comment |
Using Angular's Dynamic forms I'm building a new input field
form.ts
usernameCallback(body) {
console.log(`hello ${body}`);
this.usernameService.post(body)
.subscribe(
data => {
console.log(data);
},
error => {
console.warn(`Error: ${error}`);
}
);
}
ngOnInit() {
new InputField({
key: 'username',
label: 'Username',
value: '',
placeholder: 'Enter username',
required: true,
callback: this.usernameCallback
}),
}
So this is the basics of the code.
I have inside UsernameService a method post() which sends an http post request.
usernameCallback() is added to the InputField and has the type of Function to it.
Within input.component.ts where the form is built I am doing
callback() {
console.log(this.field.callback);
this.field.callback('cheddar');
}
The console log prints out the content from usernameCallback which is fine but I get an error
ERROR TypeError: Cannot read property 'post' of undefined
It looks like it isn't able to process the usernameService but I cannot figure out why.
angular angular7 edited Nov 29 '18 at 17:03
Goncalo Peres
1,4771721
asked Nov 22 '18 at 18:00
ngDoughngDough
659
1
this.usernameCallback.bind(this)should do the trick
– yurzui
Nov 22 '18 at 18:01
Alternatively you can use instance arrow function likeusernameCallback = (body) => {More on this you can find everywhere:) github.com/Microsoft/TypeScript/wiki/%27this%27-in-TypeScript
– yurzui
Nov 22 '18 at 18:03
Where shouldthis.usernameCallback.bind(this)be places @yurzui
– ngDough
Nov 22 '18 at 18:07
callback: this.usernameCallback.bind(this)
– yurzui
Nov 22 '18 at 18:18
Possible duplicate of How to access the correct `this` inside a callback?
– ConnorsFan
Nov 22 '18 at 18:49
add a comment |
Using Angular's Dynamic forms I'm building a new input field
form.ts
usernameCallback(body) {
console.log(`hello ${body}`);
this.usernameService.post(body)
.subscribe(
data => {
console.log(data);
},
error => {
console.warn(`Error: ${error}`);
}
);
}
ngOnInit() {
new InputField({
key: 'username',
label: 'Username',
value: '',
placeholder: 'Enter username',
required: true,
callback: this.usernameCallback
}),
}
So this is the basics of the code.
I have inside UsernameService a method post() which sends an http post request.
usernameCallback() is added to the InputField and has the type of Function to it.
Within input.component.ts where the form is built I am doing
callback() {
console.log(this.field.callback);
this.field.callback('cheddar');
}
The console log prints out the content from usernameCallback which is fine but I get an error
ERROR TypeError: Cannot read property 'post' of undefined
It looks like it isn't able to process the usernameService but I cannot figure out why.
angular angular7 edited Nov 29 '18 at 17:03
Goncalo Peres
1,4771721
asked Nov 22 '18 at 18:00
ngDoughngDough
659
Using Angular's Dynamic forms I'm building a new input field
form.ts
usernameCallback(body) {
console.log(`hello ${body}`);
this.usernameService.post(body)
.subscribe(
data => {
console.log(data);
},
error => {
console.warn(`Error: ${error}`);
}
);
}
ngOnInit() {
new InputField({
key: 'username',
label: 'Username',
value: '',
placeholder: 'Enter username',
required: true,
callback: this.usernameCallback
}),
}
So this is the basics of the code.
I have inside UsernameService a method post() which sends an http post request.
usernameCallback() is added to the InputField and has the type of Function to it.
Within input.component.ts where the form is built I am doing
callback() {
console.log(this.field.callback);
this.field.callback('cheddar');
}
The console log prints out the content from usernameCallback which is fine but I get an error
ERROR TypeError: Cannot read property 'post' of undefined
It looks like it isn't able to process the usernameService but I cannot figure out why.
angular angular7 angular angular7 edited Nov 29 '18 at 17:03
Goncalo Peres
1,4771721
asked Nov 22 '18 at 18:00
ngDoughngDough
659
edited Nov 29 '18 at 17:03
Goncalo Peres
1,4771721
asked Nov 22 '18 at 18:00
ngDoughngDough
659
edited Nov 29 '18 at 17:03
Goncalo Peres
1,4771721
edited Nov 29 '18 at 17:03
Goncalo Peres
1,4771721
edited Nov 29 '18 at 17:03
Goncalo Peres
1,4771721
1,4771721
asked Nov 22 '18 at 18:00
ngDoughngDough
659
asked Nov 22 '18 at 18:00
ngDoughngDough
659
asked Nov 22 '18 at 18:00
ngDoughngDough
659
659
1
this.usernameCallback.bind(this)should do the trick
– yurzui
Nov 22 '18 at 18:01
Alternatively you can use instance arrow function likeusernameCallback = (body) => {More on this you can find everywhere:) github.com/Microsoft/TypeScript/wiki/%27this%27-in-TypeScript
– yurzui
Nov 22 '18 at 18:03
Where shouldthis.usernameCallback.bind(this)be places @yurzui
– ngDough
Nov 22 '18 at 18:07
callback: this.usernameCallback.bind(this)
– yurzui
Nov 22 '18 at 18:18
Possible duplicate of How to access the correct `this` inside a callback?
– ConnorsFan
Nov 22 '18 at 18:49
add a comment |
1
this.usernameCallback.bind(this)should do the trick
– yurzui
Nov 22 '18 at 18:01
Alternatively you can use instance arrow function likeusernameCallback = (body) => {More on this you can find everywhere:) github.com/Microsoft/TypeScript/wiki/%27this%27-in-TypeScript
– yurzui
Nov 22 '18 at 18:03
Where shouldthis.usernameCallback.bind(this)be places @yurzui
– ngDough
Nov 22 '18 at 18:07
callback: this.usernameCallback.bind(this)
– yurzui
Nov 22 '18 at 18:18
Possible duplicate of How to access the correct `this` inside a callback?
– ConnorsFan
Nov 22 '18 at 18:49
1
1
this.usernameCallback.bind(this) should do the trick– yurzui
Nov 22 '18 at 18:01
this.usernameCallback.bind(this) should do the trick– yurzui
Nov 22 '18 at 18:01
Alternatively you can use instance arrow function like
usernameCallback = (body) => { More on this you can find everywhere:) github.com/Microsoft/TypeScript/wiki/%27this%27-in-TypeScript– yurzui
Nov 22 '18 at 18:03
Alternatively you can use instance arrow function like
usernameCallback = (body) => { More on this you can find everywhere:) github.com/Microsoft/TypeScript/wiki/%27this%27-in-TypeScript– yurzui
Nov 22 '18 at 18:03
Where should
this.usernameCallback.bind(this) be places @yurzui– ngDough
Nov 22 '18 at 18:07
Where should
this.usernameCallback.bind(this) be places @yurzui– ngDough
Nov 22 '18 at 18:07
callback: this.usernameCallback.bind(this)– yurzui
Nov 22 '18 at 18:18
callback: this.usernameCallback.bind(this)– yurzui
Nov 22 '18 at 18:18
Possible duplicate of How to access the correct `this` inside a callback?
– ConnorsFan
Nov 22 '18 at 18:49
Possible duplicate of How to access the correct `this` inside a callback?
– ConnorsFan
Nov 22 '18 at 18:49
add a comment |
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1
this.usernameCallback.bind(this)should do the trick– yurzui
Nov 22 '18 at 18:01
Alternatively you can use instance arrow function like
usernameCallback = (body) => {More on this you can find everywhere:) github.com/Microsoft/TypeScript/wiki/%27this%27-in-TypeScript– yurzui
Nov 22 '18 at 18:03
Where should
this.usernameCallback.bind(this)be places @yurzui– ngDough
Nov 22 '18 at 18:07
callback: this.usernameCallback.bind(this)– yurzui
Nov 22 '18 at 18:18
Possible duplicate of How to access the correct `this` inside a callback?
– ConnorsFan
Nov 22 '18 at 18:49