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Angular 5 and 4 CSS Classes for Forms Validation - CSS Style

The forms are building blocks of any web and mobile applications and Angular 5 and 4 provides us two approaches for developing apps(Angular forms) -
1)      Template Driven Forms
2)      Model Driven/Reactive forms

The Css Classes for Angular Control
Just like AngularJs 1.x, Angular automatically shiners many control properties onto the form control element as CSS Classes. These Angular classes look like –
1)      .ng-valid
2)      .ng-invalid
3)      .ng-pending
4)      .ng-pristine
5)      .ng-dirty
6)      .ng-untouched
7)      .ng-touched

The example looks like
.ng-valid[required], .ng-valid.required  {
    font-size: 16px;
    text-align: center;
    border-left: 10pxsolid rgb(218, 200, 43); /* yellow */
}

.ng-invalid:not(form)  {
    font-size: 16px;
    text-align: center;
    border-left: 10pxsolid #e94646; /* red */
}

In the above example, the “ng-valid” and “ng-invalid” classes is used to set the fonts size, color and align of each form control's.

In the HTML page looks like
//The .ng-valid[required] rule is valid for
inputclass="ng-valid"required>

//The .ng-valid.required rule is valid for
inputclass="ng-valid required">

//Both rules are valid for
inputclass="ng-valid required" required>


Reference – https://angular.io/guide/form-validation

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Angular 5 and 4 CSS Classes for Forms Validation - CSS Style

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