scss/forms/_validation.scss

@use "../config" as *;
@use "../functions" as *;
@use "../mixins/border-radius" as *;
@use "../mixins/focus-ring" as *;
@use "form-variables" as *;
@use "../tooltip" as *; // bring in tooltip variables

// Form validation
//
// Provide feedback to users when form field values are valid or invalid. Works
// primarily for client-side validation via scoped `:invalid` and `:valid`
// pseudo-classes but also includes `.is-invalid` and `.is-valid` classes for
// server-side validation.

// This mixin uses an `if()` technique to be compatible with Dart Sass
// See https://github.com/sass/sass/issues/1873#issuecomment-152293725 for more details

// scss-docs-start form-validation-mixins
@mixin form-validation-state-selector($state) {
  @if ($state == "valid" or $state == "invalid") {
    .was-validated #{if(sass(&): "&"; else: "")}:#{$state},
    #{if(sass(&): "&"; else: "")}.is-#{$state} {
      @content;
    }
  } @else {
    #{if(sass(&): "&"; else: "")}.is-#{$state} {
      @content;
    }
  }
}

@mixin form-validation-state(
  $state,
  $color,
  $icon,
  $tooltip-color: color-contrast($color),
  $tooltip-bg-color: rgba($color, $form-feedback-tooltip-opacity),
  $focus-ring-color: null, // mdo-do: fix
  $border-color: $color
) {
  .#{$state}-feedback {
    display: none;
    width: 100%;
    margin-top: $form-feedback-margin-top;
    font-size: $form-feedback-font-size;
    font-style: $form-feedback-font-style;
    color: $color;
  }

  .#{$state}-tooltip {
    position: absolute;
    top: 100%;
    z-index: 5;
    display: none;
    max-width: 100%; // Contain to parent when possible
    padding: $form-feedback-tooltip-padding-y $form-feedback-tooltip-padding-x;
    margin-top: .1rem;
    font-size: $form-feedback-tooltip-font-size;
    line-height: $form-feedback-tooltip-line-height;
    color: $tooltip-color;
    background-color: $tooltip-bg-color;
    @include border-radius($form-feedback-tooltip-border-radius);
  }

  @include form-validation-state-selector($state) {
    ~ .#{$state}-feedback,
    ~ .#{$state}-tooltip {
      display: block;
    }
  }

  .form-control {
    @include form-validation-state-selector($state) {
      border-color: $border-color;

      @if $enable-validation-icons {
        padding-inline-end: calc(var(--control-padding-x) * 3.5);
        background-image: escape-svg($icon);
        background-repeat: no-repeat;
        background-position: right var(--control-padding-x) center;
        background-size: 1rem;
      }

      &:focus-visible {
        @include focus-ring(true, $color: $focus-ring-color);
        border-color: $border-color;
      }
    }

    &::-webkit-contacts-auto-fill-button {
      @if $enable-validation-icons {
        // margin-inline-end: calc(var(--control-padding-x) * 3);
      }
    }
  }

  // stylelint-disable-next-line selector-no-qualifying-type
  textarea.form-control {
    @include form-validation-state-selector($state) {
      @if $enable-validation-icons {
        // padding-inline-end: $input-height-inner;
        background-position: right var(--control-padding-x) top var(--control-padding-x);
        // background-position: top $input-height-inner-quarter right $input-height-inner-quarter;
      }
    }
  }

  .form-control-color {
    @include form-validation-state-selector($state) {
      @if $enable-validation-icons {
        // width: calc($form-color-width + $input-height-inner);
      }
    }
  }

  .form-check-input {
    @include form-validation-state-selector($state) {
      border-color: $border-color;

      &:checked {
        background-color: $color;
      }

      &:focus {
        // box-shadow: $focus-box-shadow;
      }

      ~ .form-check-label {
        color: $color;
      }
    }
  }
  .form-check-inline .form-check-input {
    ~ .#{$state}-feedback {
      margin-inline-start: .5em;
    }
  }

  .input-group {
    > .form-control:not(:focus),
    > .form-select:not(:focus),
    > .form-floating:not(:focus-within) {
      @include form-validation-state-selector($state) {
        @if $state == "valid" {
          z-index: 3;
        } @else if $state == "invalid" {
          z-index: 4;
        }
      }
    }
  }
}
// scss-docs-end form-validation-mixins

@layer components {
  // scss-docs-start form-validation-states-loop
  @each $state, $data in $form-validation-states {
    @include form-validation-state($state, $data...);
  }
  // scss-docs-end form-validation-states-loop
}