src/styles/mixins/input.less

.hover(@color: @input-hover-border-color) {
    border-color: tint(@color, 20%);
}
.hover-error() {
    border-color: @error-color;
}
.active(@color: @input-hover-border-color) {
    border-color: tint(@color, 20%);
    outline: 0;
    box-shadow: 0 0 0 2px fade(@color, 20%);
}
.active-error() {
    border-color: @error-color;
    outline: 0;
    box-shadow: 0 0 0 2px fade(@error-color, 20%);
}
.disabled() {
    background-color: @input-disabled-bg;
    opacity: 1;
    cursor: @cursor-disabled;
    color: #ccc;
    &:hover {
        .hover(@input-border-color);
    }
}
.input-large() {
    font-size: @font-size-base;
    padding: @input-padding-vertical-large @input-padding-horizontal;
    height: @input-height-large;
}
.input-small() {
    padding: @input-padding-vertical-small @input-padding-horizontal;
    height: @input-height-small;
    border-radius: @btn-border-radius-small;
}
.input() {
    display: inline-block;
    width: 100%;
    height: @input-height-base;
    line-height: @line-height-base;
    padding: @input-padding-vertical-base @input-padding-horizontal;
    font-size: @font-size-small;
    border: 1px solid @input-border-color;
    border-radius: @btn-border-radius;
    color: @input-color;
    background-color: @input-bg;
    background-image: none;
    position: relative;
    cursor: text;
    .placeholder();
    transition: border @transition-time @ease-in-out, background @transition-time @ease-in-out, box-shadow @transition-time @ease-in-out;
    &:hover {
        .hover();
    }
    &:focus {
        .active();
    }
    &[disabled],
    fieldset[disabled] & {
        .disabled();
    }
    // Reset height for textarea
    textarea& {
        max-width: 100%;
        height: auto;
        vertical-align: bottom;
        font-size: @font-size-base;
    }
    // Size
    &-large {
        .input-large();
    }
    &-small {
        .input-small();
    }
}
.input-error() {
    border: 1px solid @error-color;
    &:hover {
        .hover-error;
    }
    &:focus {
        .active-error;
    }
}
.input-group(@inputClass) {
    display: table;
    width: 100%;
    border-collapse: separate;
    position: relative;
    font-size: @font-size-small;
    top: 1px; // fixed when using in form inline,
    &-large{
        font-size: @font-size-base;
    }
    // Undo padding and float of grid classes
    &[class*="col-"] {
        float: none;
        padding-left: 0;
        padding-right: 0;
    }
    > [class*="col-"] {
        padding-right: 8px;
    }
    &-prepend,
    &-append,
    > .@{inputClass} {
        display: table-cell;
        &:not(:first-child):not(:last-child) {
            border-radius: 0;
        }
    }
    &-prepend .@{css-prefix}btn,
    &-append .@{css-prefix}btn
    {
        border-color: transparent;
        background-color: transparent;
        color: inherit;
        margin: -(@input-padding-vertical-base + 1) (-@input-padding-horizontal);
    }
    &-prepend,
    &-append
    {
        width: 1px; // To make addon/wrap as small as possible
        white-space: nowrap;
        vertical-align: middle;
    }
    .@{inputClass} {
        width: 100%;
        float: left;
        margin-bottom: 0;
        position: relative;
        z-index: 2;
    }
    &-prepend,
    &-append
    {
        padding: @input-padding-vertical-base @input-padding-horizontal;
        font-size: inherit;
        font-weight: normal;
        line-height: 1;
        color: @input-color;
        text-align: center;
        background-color: #eee;
        border: 1px solid @input-border-color;
        border-radius: @border-radius-base;
        // Reset Select's style in addon
        .@{css-prefix}select {
            margin: -(@input-padding-vertical-base + 1) (-@input-padding-horizontal);  // lesshint spaceAroundOperator: false
            &-selection {
                background-color: inherit;
                margin: -1px;
                border: 1px solid transparent;
            }
            &-visible .@{css-prefix}select-selection{
                box-shadow: none;
            }
        }
    }
    // Reset rounded corners
    > span > .@{inputClass}:first-child,
    > .@{inputClass}:first-child,
    &-prepend
    {
        border-bottom-right-radius: 0 !important;
        border-top-right-radius: 0 !important;
        // Reset Select's style in addon
        .@{css-prefix}-select .@{css-prefix}-select-selection {
            border-bottom-right-radius: 0;
            border-top-right-radius: 0;
        }
    }
    &-prepend {
        border-right: 0;
    }
    &-append {
        border-left: 0;
    }
    > .@{inputClass}:last-child,
    &-append
    {
        border-bottom-left-radius: 0 !important;
        border-top-left-radius: 0 !important;
        // Reset Select's style in addon
        .@{css-prefix}-select .@{css-prefix}-select-selection {
            border-bottom-left-radius: 0;
            border-top-left-radius: 0;
        }
    }
    // Sizing options
    &-large .@{inputClass},
    &-large > &-prepend,
    &-large > &-append
    {
        .input-large();
    }
    &-small .@{inputClass},
    &-small > &-prepend,
    &-small > &-append
    {
        .input-small();
    }
}
.input-group-error{
    &-prepend,
    &-append
    {
        background-color: #fff;
        border: 1px solid @error-color;
        .@{css-prefix}select {
            &-selection {
                background-color: inherit;
                border: 1px solid transparent;
            }
        }
    }
    &-prepend {
        border-right: 0;
    }
    &-append {
        border-left: 0;
    }
}