{"id":12582,"date":"2022-10-01T05:07:59","date_gmt":"2022-09-30T23:37:59","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-angular-2-why-doesnt-material-want-to-show-error-message\/"},"modified":"2022-10-01T05:07:59","modified_gmt":"2022-09-30T23:37:59","slug":"solved-angular-2-why-doesnt-material-want-to-show-error-message","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-angular-2-why-doesnt-material-want-to-show-error-message\/","title":{"rendered":"[Solved] Angular 2+, why doesn’t material want to show error message?"},"content":{"rendered":"

[ad_1]
\n<\/p>\n

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<\/div>\n
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\n

*Update<\/strong><\/p>\n

To create a customFormControl over a control, we use parent, see an example<\/p>\n

checkPasswords(): ValidatorFn {\n    \/\/see that the argument is a FormControl\n    return (control: FormControl): ValidationErrors => {\n      \/\/the formGroup is control.parent\n      const group = control.parent as FormGroup;\n      \/\/but we must sure that is defined\n      if (!group) return null;\n      console.log(group.get(\"password\").value);\n      let pass = group.get(\"password\").value;\n      let confirmPass = group.get(\"passwordConfirm\").value;\n\n      return confirmPass ? pass === confirmPass ? null : { mismatch: true } : null;\n    };\n  }\n<\/code><\/pre>\n
As we want to make check when password change too<\/p>\n
ngOnInit() {\n    this.form.get(\"password\").valueChanges.subscribe(() => {\n      this.form.get(\"passwordConfirm\").updateValueAndValidity();\n    });\n  }\n<\/code><\/pre>\n
See that the form is like<\/p>\n
form = new FormGroup({\n    password: new FormControl(\"\", Validators.required),\n    passwordConfirm: new FormControl(\"\", [\n      Validators.required,\n      this.checkPasswords()\n    ])\n  });\n<\/code><\/pre>\n
And the .html<\/p>\n
<form [formGroup]=\"form\" class=\"example-form\">\n  <mat-form-field class=\"example-full-width\">\n    <input matInput placeholder=\"password\" formControlName=\"password\">\n        <mat-error >\n      required\n    <\/mat-error>\n\n  <\/mat-form-field>\n  <mat-form-field class=\"example-full-width\">\n    <input matInput placeholder=\"repeat password\" formControlName=\"passwordConfirm\"\n           >\n    <mat-error *ngIf=\"form.get('passwordConfirm').hasError('mismatch')\">\n      must matcher\n    <\/mat-error>\n    <mat-error *ngIf=\"form.get('passwordConfirm').hasError('required')\">\n      required\n    <\/mat-error>\n  <\/mat-form-field>\n<\/form>\n<\/code><\/pre>\n
The stackblitz here<\/a><\/p>\n
The other way is using a custom errorStateMatcher<\/p>\n
Update 2<\/strong> I said that other way is “use a errorStateMatcher.” A erroStateMatcher is a simple function that return true or false. If return true, our control will be marked as if he was invalid(*)<\/p>\n
Imagine we has a form like<\/p>\n
form = new FormGroup({\n    password: new FormControl(\"\", Validators.required),\n    passwordConfirm: new FormControl(\"\", [\n      Validators.required,\n\n    ])\n  },this.checkPasswords());\n<\/code><\/pre>\n
See that error is belong to formGroup, we can create a customErrorMatcher that return true if control is invalid or if form.hasError(‘mismatch`)<\/p>\n
export class MyErrorStateMatcher implements ErrorStateMatcher {\n  isErrorState(control: FormControl | null, form: FormGroupDirective | NgForm | null): boolean {\n    return !!((control && form.hasError('mismatch') || control.invalid) && control.touched );\n  }\n}\n<\/code><\/pre>\n
Well, the .html<\/p>\n
<form [formGroup]=\"form\" class=\"example-form\">\n  <mat-form-field class=\"example-full-width\">\n    <input matInput placeholder=\"password\" formControlName=\"password\">\n        <mat-error >\n      required\n    <\/mat-error>\n\n  <\/mat-form-field>\n<!--see that the \"errorStateMatcher\" is applied to the input \"passwordConfirm\"-->\n  <mat-form-field class=\"example-full-width\">\n    <input matInput placeholder=\"repeat password\" formControlName=\"passwordConfirm\"\n    [errorStateMatcher]=\"matcher\"\n           >\n      <!--here show the error is form.hasError('mismatch')-->\n    <mat-error *ngIf=\"form.hasError('mismatch')\">\n      must matcher\n    <\/mat-error>\n       <!--here show the error is form.get('passwordConfirm').hasError-->\n    <mat-error *ngIf=\"form.get('passwordConfirm').hasError('required')\">\n      required\n    <\/mat-error>\n  <\/mat-form-field>\n<\/form>\n<\/code><\/pre>\n
As always I can, the stackblitz<\/a><\/p>\n
(*) check in the stackblitz form.get(‘passwordConfirm’).invalid<\/p>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            5<\/span> <\/p><\/div>\n<\/div>\n
[ad_2]<\/p>\n
solved Angular 2+, why doesn’t material want to show error message? <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] *Update To create a customFormControl over a control, we use parent, see an example checkPasswords(): ValidatorFn { \/\/see that the argument is a FormControl return (control: FormControl): ValidationErrors => { \/\/the formGroup is control.parent const group = control.parent as FormGroup; \/\/but we must sure that is defined if (!group) return null; console.log(group.get(“password”).value); let pass … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[732,2238,1289],"class_list":["post-12582","post","type-post","status-publish","format-standard","hentry","category-solved","tag-angular","tag-angular-material","tag-angular-reactive-forms"],"yoast_head":"\n[Solved] Angular 2+, why doesn't material want to show error message? - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-angular-2-why-doesnt-material-want-to-show-error-message\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Angular 2+, why doesn't material want to show error message? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] *Update To create a customFormControl over a control, we use parent, see an example checkPasswords(): ValidatorFn { \/\/see that the argument is a FormControl return (control: FormControl): ValidationErrors => { \/\/the formGroup is control.parent const group = control.parent as FormGroup; \/\/but we must sure that is defined if (!group) return null; console.log(group.get("password").value); let pass ... 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