Cannot read the property in the typescript in Angular

Question

I created a static array in the class in typescipt. But I couldn't read its property.

The error is shown below.

ERROR TypeError: Cannot read property 'forbiddenProjectNames' of undefined

Here is my code snippet shown below.

export class CustomValidator {

  private static forbiddenProjectNames = ['Test'];

  static forbiddenNames(control: FormControl): {[s: string]: boolean} {
    if (this.forbiddenProjectNames.indexOf(control.value) !== -1) {
      return { 'nameIsForbidden': true };
    } else {
      return null;
    }
  }

How can I fix it?

Why do you mark the property and the method as static? At least for the property it does not make sense, because you mark it as private anyway, so you don't want to instatiate it from outside. — dave0688
– dave0688, Commented Oct 4, 2019 at 12:21
your code is working fine stackblitz.com/edit/angular-cnxev8 — jitender
– jitender, Commented Oct 4, 2019 at 12:25

Totati · Accepted Answer · 2019-10-04 12:19:14Z

2

You marked it as static, so you can refer to it like this: CustomValidator.forbiddenProjectNames

answered Oct 4, 2019 at 12:19

Totati

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1 Comment

jitender Over a year ago

its working fine in even if he use this keyword stackblitz.com/edit/angular-cnxev8

jitender · Accepted Answer · 2019-10-04 14:31:10Z

0

I can solve it by using this

 static forbiddenNames(control: FormControl): {[s: string]: boolean} {
    if (CustomValidator.forbiddenProjectNames.indexOf(control.value) !== -1) {
      return { 'projectNameIsForbidden': true };
    } else {
      return null;
    }
  }

edited Oct 4, 2019 at 14:31

jitender

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answered Oct 4, 2019 at 12:24

Sercan Noyan Germiyanoğlu

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