bootstrap-less-port/less/_forms.less

A Less port of Bootstrap v4

//
// Textual form controls
//

.form-control {
	display: block;
	width: 100%;
	height: @input-height;
	padding: @input-padding-y @input-padding-x;
	// LESS PORT: Less doesn’t strip “empty” property values so we have to check for a value first.
	& when not (@input-font-family = ~"") { font-family: @input-font-family; }
	#font-size(@input-font-size);
	font-weight: @input-font-weight;
	line-height: @input-line-height;
	color: @input-color;
	background-color: @input-bg;
	background-clip: padding-box;
	border: @input-border-width solid @input-border-color;

	// Note: This has no effect on <select>s in some browsers, due to the limited stylability of `<select>`s in CSS.
	#border-radius(@input-border-radius, 0);

	#box-shadow(@input-box-shadow);
	#transition(@input-transition);

	// Unstyle the caret on `<select>`s in IE10+.
	&::-ms-expand {
		background-color: transparent;
		border: 0;
	}

	// Remove select outline from select box in FF
	&:-moz-focusring {
		color: transparent;
		text-shadow: 0 0 0 @input-color;
	}

	// Customize the `:focus` state to imitate native WebKit styles.
	#form-control-focus(@ignore-warning: true);

	// Placeholder
	&::placeholder {
		color: @input-placeholder-color;
		// Override Firefox's unusual default opacity; see https://github.com/twbs/bootstrap/pull/11526.
		opacity: 1;
	}

	// Disabled and read-only inputs
	//
	// HTML5 says that controls under a fieldset > legend:first-child won't be
	// disabled if the fieldset is disabled. Due to implementation difficulty, we
	// don't honor that edge case; we style them as disabled anyway.
	&:disabled,
	&[readonly] {
		background-color: @input-disabled-bg;
		// iOS fix for unreadable disabled content; see https://github.com/twbs/bootstrap/issues/11655.
		opacity: 1;
	}
}

input[type="date"],
input[type="time"],
input[type="datetime-local"],
input[type="month"] {
	&.form-control {
		appearance: none; // Fix appearance for date inputs in Safari
	}
}


select.form-control {
	&:focus::-ms-value {
		// Suppress the nested default white text on blue background highlight given to
		// the selected option text when the (still closed) <select> receives focus
		// in IE and (under certain conditions) Edge, as it looks bad and cannot be made to
		// match the appearance of the native widget.
		// See https://github.com/twbs/bootstrap/issues/19398.
		color: @input-color;
		background-color: @input-bg;
	}
}

// Make file inputs better match text inputs by forcing them to new lines.
.form-control-file,
.form-control-range {
	display: block;
	width: 100%;
}


//
// Labels
//

// For use with horizontal and inline forms, when you need the label (or legend)
// text to align with the form controls.
.col-form-label {
	padding-top: add(@input-padding-y, @input-border-width);
	padding-bottom: add(@input-padding-y, @input-border-width);
	margin-bottom: 0; // Override the `<label>/<legend>` default
	#font-size(inherit); // Override the `<legend>` default
	line-height: @input-line-height;
}

.col-form-label-lg {
	padding-top: add(@input-padding-y-lg, @input-border-width);
	padding-bottom: add(@input-padding-y-lg, @input-border-width);
	#font-size(@input-font-size-lg);
	line-height: @input-line-height-lg;
}

.col-form-label-sm {
	padding-top: add(@input-padding-y-sm, @input-border-width);
	padding-bottom: add(@input-padding-y-sm, @input-border-width);
	#font-size(@input-font-size-sm);
	line-height: @input-line-height-sm;
}


// Readonly controls as plain text
//
// Apply class to a readonly input to make it appear like regular plain
// text (without any border, background color, focus indicator)

.form-control-plaintext {
	display: block;
	width: 100%;
	padding: @input-padding-y 0;
	margin-bottom: 0; // match inputs if this class comes on inputs with default margins
	#font-size(@input-font-size);
	line-height: @input-line-height;
	color: @input-plaintext-color;
	background-color: transparent;
	border: solid transparent;
	border-width: @input-border-width 0;

	&.form-control-sm,
	&.form-control-lg {
		padding-right: 0;
		padding-left: 0;
	}
}


// Form control sizing
//
// Build on `.form-control` with modifier classes to decrease or increase the
// height and font-size of form controls.
//
// Repeated in `_input_group.scss` to avoid Sass extend issues.

.form-control-sm {
	height: @input-height-sm;
	padding: @input-padding-y-sm @input-padding-x-sm;
	#font-size(@input-font-size-sm);
	line-height: @input-line-height-sm;
	#border-radius(@input-border-radius-sm);
}

.form-control-lg {
	height: @input-height-lg;
	padding: @input-padding-y-lg @input-padding-x-lg;
	#font-size(@input-font-size-lg);
	line-height: @input-line-height-lg;
	#border-radius(@input-border-radius-lg);
}

select.form-control {
	&[size],
	&[multiple] {
		height: auto;
	}
}

textarea.form-control {
	height: auto;
}

// Form groups
//
// Designed to help with the organization and spacing of vertical forms. For
// horizontal forms, use the predefined grid classes.

.form-group {
	margin-bottom: @form-group-margin-bottom;
}

.form-text {
	display: block;
	margin-top: @form-text-margin-top;
}


// Form grid
//
// Special replacement for our grid system's `.row` for tighter form layouts.

.form-row {
	display: flex;
	flex-wrap: wrap;
	margin-right: (-@form-grid-gutter-width / 2);
	margin-left: (-@form-grid-gutter-width / 2);

	> .col,
	> [class*="col-"] {
		padding-right: (@form-grid-gutter-width / 2);
		padding-left: (@form-grid-gutter-width / 2);
	}
}


// Checkboxes and radios
//
// Indent the labels to position radios/checkboxes as hanging controls.

.form-check {
	position: relative;
	display: block;
	padding-left: @form-check-input-gutter;
}

.form-check-input {
	position: absolute;
	margin-top: @form-check-input-margin-y;
	margin-left: -@form-check-input-gutter;

	// Use [disabled] and :disabled for workaround https://github.com/twbs/bootstrap/issues/28247
	&[disabled] ~ .form-check-label,
	&:disabled ~ .form-check-label {
		color: @text-muted;
	}
}

.form-check-label {
	margin-bottom: 0; // Override default `<label>` bottom margin
}

.form-check-inline {
	display: inline-flex;
	align-items: center;
	padding-left: 0; // Override base .form-check
	margin-right: @form-check-inline-margin-x;

	// Undo .form-check-input defaults and add some `margin-right`.
	.form-check-input {
		position: static;
		margin-top: 0;
		margin-right: @form-check-inline-input-margin-x;
		margin-left: 0;
	}
}


// 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.

//@each $state, $data in $form-validation-states {
//  @include form-validation-state($state, $data[color], $data[icon]);
//}
each(@form-validation-states, #(@data, @state) {
	@state-name: replace(@state, "@", "");
	#form-validation-state(@state-name, @data[color], @data[icon]);
});

// Inline forms
//
// Make forms appear inline(-block) by adding the `.form-inline` class. Inline
// forms begin stacked on extra small (mobile) devices and then go inline when
// viewports reach <768px.
//
// Requires wrapping inputs and labels with `.form-group` for proper display of
// default HTML form controls and our custom form controls (e.g., input groups).

.form-inline {
	display: flex;
	flex-flow: row wrap;
	align-items: center; // Prevent shorter elements from growing to same height as others (e.g., small buttons growing to normal sized button height)

	// Because we use flex, the initial sizing of checkboxes is collapsed and
	// doesn't occupy the full-width (which is what we want for xs grid tier),
	// so we force that here.
	.form-check {
		width: 100%;
	}

	// Kick in the inline
	#media-breakpoint-up(sm, {
		label {
			display: flex;
			align-items: center;
			justify-content: center;
			margin-bottom: 0;
		}

		// Inline-block all the things for "inline"
		.form-group {
			display: flex;
			flex: 0 0 auto;
			flex-flow: row wrap;
			align-items: center;
			margin-bottom: 0;
		}

		// Allow folks to *not* use `.form-group`
		.form-control {
			display: inline-block;
			width: auto; // Prevent labels from stacking above inputs in `.form-group`
			vertical-align: middle;
		}

		// Make static controls behave like regular ones
		.form-control-plaintext {
			display: inline-block;
		}

		.input-group,
		.custom-select {
			width: auto;
		}

		// Remove default margin on radios/checkboxes that were used for stacking, and
		// then undo the floating of radios and checkboxes to match.
		.form-check {
			display: flex;
			align-items: center;
			justify-content: center;
			width: auto;
			padding-left: 0;
		}
		.form-check-input {
			position: relative;
			flex-shrink: 0;
			margin-top: 0;
			margin-right: @form-check-input-margin-x;
			margin-left: 0;
		}

		.custom-control {
			align-items: center;
			justify-content: center;
		}
		.custom-control-label {
			margin-bottom: 0;
		}
	});
}