javascript - Styling mat-form-field input in Angular/Material

Question

I have a mat-form-field with input that I am wanting to add a custom style to, however I cannot find any documentation regarding this on the official Angular Material website.

My eventual goal is to:

• Change the underline colour after the input box is selected
• Remove the floating label (if possible - I know this was a feature but now deprecated).

I'm not the most adept with Angular just yet, but if things need changing in JS, then I can always give it my best shot.

I just need a little guidance.

Current Code:

<form class="search-form">
  <mat-form-field class="example-full-width">
    <input class="toolbar-search" type="text" matInput>
    <mat-placeholder>Search</mat-placeholder>
    <mat-icon matSuffix style="font-size: 1.2em">search</mat-icon>
  </mat-form-field>
</form>

Current CSS:

// Change text colour when inputting text
.toolbar-search, mat-placeholder {
  color: white;
}

// Changes the underline and placeholder colour before input is selected
/deep/ .mat-input-underline {
    background-color: white;
}

Answer 1

For change the styles of material inputs with scss:

Standard:

::ng-deep .mat-form-field {
    .mat-input-element {
        color: slategray;
    }
    .mat-form-field-label {
        color: slategray;
    }
    .mat-form-field-underline {
        background-color: slategray;
    }
    .mat-form-field-ripple {
        background-color: slategray;
    }
    .mat-form-field-required-marker {
        color: slategray;
    }
}

Focused: (when selected)

::ng-deep .mat-form-field.mat-focused {
    .mat-form-field-label {
        color: #ff884d;
    }
    .mat-form-field-ripple {
        background-color: #ff884d;
    }
    .mat-form-field-required-marker {
        color: #ff884d;
    }
    .mat-input-element {
        color: #ff884d;
    }
}

Invalid:

::ng-deep .mat-form-field.mat-form-field-invalid {
    .mat-input-element {
        color: #ff33cc;
    }
    .mat-form-field-label {
        color: #ff33cc;
        .mat-form-field-required-marker {
            color: #ff33cc;
        }
    }
    .mat-form-field-ripple {
        background-color: #ff33cc;
    }
}

DEMO

you can also use ViewEncapsulation.None to avoid ::ng-deep which is deprecated:

import { ViewEncapsulation } from '@angular/core';

@Component({
    ...
    encapsulation: ViewEncapsulation.None
})