Yuri Katkov ganqqwerty
ganqqwerty
/ form.html
Created
June 18, 2019 08:34
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| <h2>My form</h2> | |
| <form [formGroup]="myForm" | |
| (ngSubmit)="onSubmit()"> | |
| <div> | |
| Make email mandatory <input formControlName="myCheckbox" | |
| type="checkbox"> | |
| </div> | |
| <div> | |
| Email: <input formControlName="myEmailField" |
ganqqwerty
/ app.component.ts
Created
June 18, 2019 08:42
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| ngOnInit() { | |
| this.myForm = this.fb.group({ | |
| myCheckbox: [''], | |
| myEmailField: ['', [ | |
| Validators.maxLength(250), | |
| Validators.minLength(5), | |
| Validators.pattern(/.+@.+\..+/) | |
| ]] | |
| }); | |
| } |
ganqqwerty
/ app.component.ts
Created
June 18, 2019 09:05
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| this.myForm.get('myCheckbox').valueChanges | |
| .subscribe(value => { | |
| if(value) { | |
| this.myForm.get('myEmailField').setValidators(Validators.required) | |
| } else { | |
| this.myForm.get('myEmailField').clearValidators(); | |
| } | |
| } | |
| ); |
ganqqwerty
/ app.component.ts
Last active
June 19, 2019 21:01
Naive and buggy approach to dynamic validator
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| this.myForm.get('myCheckbox').valueChanges | |
| .subscribe(value => { | |
| if(value) { | |
| this.myForm.get('myEmailField').setValidators(Validators.required) | |
| } else { | |
| this.myForm.get('myEmailField').clearValidators(); | |
| } | |
| } | |
| ); |
ganqqwerty
/ app.component.ts
Last active
June 19, 2019 21:02
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| private emailValidators = [ | |
| Validators.maxLength(250), | |
| Validators.minLength(5), | |
| Validators.pattern(/.+@.+\..+/) | |
| ]; | |
| ngOnInit() { | |
| this.myForm = this.fb.group({ | |
| myCheckbox: [''], | |
| myEmailField: ['', this.emailValidators] |
ganqqwerty
/ app.component.ts
Created
June 18, 2019 11:49
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| this.myForm.get('myCheckbox').valueChanges | |
| .subscribe(value => { | |
| if(value) { | |
| this.myForm.get('myEmailField').setValidators(this.emailValidators.concat(Validators.required)) | |
| } else { | |
| this.myForm.get('myEmailField').setValidators(this.emailValidators); | |
| } | |
| }); |
ganqqwerty
/ app.component.ts
Last active
June 19, 2019 21:18
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| this.myForm = this.fb.group({ | |
| myCheckbox: [''], | |
| myEmailField: ['', [ | |
| Validators.maxLength(250), | |
| Validators.minLength(5), | |
| Validators.pattern(/.+@.+\..+/) | |
| ]] | |
| }, { | |
| validators: [emailConditionallyRequiredValidator] // <----- | |
| } |
ganqqwerty
/ app.component.ts
Created
June 18, 2019 13:31
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| this.myForm = this.fb.group({ | |
| myCheckbox: [''], | |
| myEmailField: ['', [ | |
| Validators.maxLength(250), | |
| Validators.minLength(5), | |
| Validators.pattern(/.+@.+\..+/) | |
| ]] | |
| }, { | |
| validators: [emailConditionallyRequiredValidator] // <----- | |
| }); |
ganqqwerty
/ app.component.ts
Last active
June 18, 2019 13:42
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| function emailConditionallyRequiredValidator(formGroup: FormGroup) { | |
| if (formGroup.value.myCheckbox) { | |
| return Validators.required(formGroup.get('myEmailField')) ? { | |
| myEmailFieldConditionallyRequired: true, | |
| } : null; | |
| } | |
| return null; | |
| } |
ganqqwerty
/ app.component.ts
Created
June 18, 2019 14:01
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| this.myForm = this.fb.group({ | |
| myCheckbox: [''], | |
| myEmailField: ['', [ | |
| Validators.maxLength(250), | |
| Validators.minLength(5), | |
| Validators.pattern(/.+@.+\..+/), | |
| emailConditionallyRequiredValidator | |
| ]] | |
| }) |
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