Bootstrap/lib/forms.less

// Forms.less
// Base styles for various input types, form layouts, and states
// -------------------------------------------------------------


// GENERAL STYLES
// --------------

// Make all forms have space below them
form {
  margin-bottom: @baseLineHeight;
}

// Groups of fields with labels on top (legends)
legend {
  display: block;
  width: 100%;
  margin-bottom: @baseLineHeight * 1.5;
  font-size: @baseFontSize * 1.5;
  line-height: @baseLineHeight * 2;
  color: @grayDark;
  border-bottom: 1px solid #eee;
}

// Set font for forms
label,
input,
select,
textarea {
  #font > .sans-serif(normal,@baseFontSize,@baseLineHeight);
}

// Identify controls by their labels
label {
  display: block;
  margin-bottom: 5px;
  color: @grayDark;
}

// Inputs, Textareas, Selects
input,
textarea,
select,
.uneditable-input {
  display: block;
  width: 210px;
  height: @baseLineHeight;
  padding: 4px;
  margin-bottom: 9px;
  font-size: @baseFontSize;
  line-height: @baseLineHeight;
  color: @gray;
  border: 1px solid #ccc;
  .border-radius(3px);
}

// Mini reset for unique input types
input[type=image],
input[type=checkbox],
input[type=radio] {
  width: auto;
  height: auto;
  padding: 0;
  margin: 3px 0;
  *margin-top: 0; /* IE6-7 */
  line-height: normal;
  border: none;
  cursor: pointer;
}

// Reset the file input to browser defaults
input[type=file] {
  padding: initial;
  line-height: initial;
  border: initial;
  background-color: @white;
  background-color: initial;
  .box-shadow(none);
}

// Help out input buttons
input[type=button],
input[type=reset],
input[type=submit] {
  width: auto;
  height: auto;
}

// Set the height of select and file controls to match text inputs
select,
input[type=file] {
  height: @baseLineHeight * 1.5; // In IE7, the height of the select element cannot be changed by height, only font-size
  *margin-top: 4px; /* For IE7, add top margin to align select with labels */
  line-height: @baseLineHeight * 1.5;
}

// Chrome on Linux and Mobile Safari need background-color
select {
  background-color: @white;
  vertical-align: middle;
}

// Make multiple select elements height not fixed
select[multiple],
select[size] {
  height: inherit;
}

// Remove shadow from image inputs
input[type=image] {
  .box-shadow(none);
}

textarea {
  height: auto;
}



// CHECKBOXES & RADIOS
// -------------------

// Indent the labels to position radios/checkboxes as hanging
.radio,
.checkbox {
  padding-left: 18px;
}
.radio input[type=radio],
.checkbox input[type=checkbox] {
  float: left;
  margin-left: -18px;
}

// Move the options list down to align with labels
.controls > .radio:first-child,
.controls > .checkbox:first-child {
  padding-top: 6px; // has to be padding because margin collaspes
}



// FOCUS STATE
// -----------

input,
textarea {
  .box-shadow(inset 0 1px 3px rgba(0,0,0,.1));
  @transition: border linear .2s, box-shadow linear .2s;
  .transition(@transition);
}
input:focus,
textarea:focus {
  border-color: rgba(82,168,236,.8);
  @shadow: inset 0 1px 3px rgba(0,0,0,.1), 0 0 8px rgba(82,168,236,.6);
  .box-shadow(@shadow);
  outline: 0;
}
input[type=file]:focus,
input[type=checkbox]:focus,
select:focus {
  .box-shadow(none); // override for file inputs
  outline: 1px dotted #666; // Selet elements don't get box-shadow styles, so instead we do outline
}



// INPUT SIZES
// -----------

// General classes for quick sizes
.input-mini       { width: 60px; }
.input-small      { width: 90px; }
.input-medium     { width: 150px; }
.input-large      { width: 210px; }
.input-xlarge     { width: 270px; }
.input-xxlarge    { width: 530px; }

// Grid style input sizes
// This is a duplication of the main grid .columns() mixin, but subtracts 10px to account for input padding and border
.formColumns(@columnSpan: 1) {
  float: none;
  width: ((@gridColumnWidth) * @columnSpan) + (@gridGutterWidth * (@columnSpan - 1)) - 10;
  margin-left: 0;
}
input,
textarea,
select,
.uneditable-input {
  // Default columns
  &.span1     { .formColumns(1); }
  &.span2     { .formColumns(2); }
  &.span3     { .formColumns(3); }
  &.span4     { .formColumns(4); }
  &.span5     { .formColumns(5); }
  &.span6     { .formColumns(6); }
  &.span7     { .formColumns(7); }
  &.span8     { .formColumns(8); }
  &.span9     { .formColumns(9); }
  &.span10    { .formColumns(10); }
  &.span11    { .formColumns(11); }
  &.span12    { .formColumns(12); }
  &.span13    { .formColumns(13); }
  &.span14    { .formColumns(14); }
  &.span15    { .formColumns(15); }
  &.span16    { .formColumns(16); }
}



// DISABLED STATE
// --------------

// Disabled and read-only inputs
input[disabled],
select[disabled],
textarea[disabled],
input[readonly],
select[readonly],
textarea[readonly] {
  background-color: #f5f5f5;
  border-color: #ddd;
  cursor: not-allowed;
}




// FORM FIELD FEEDBACK STATES
// --------------------------

// Mixin for form field states
.formFieldState(@textColor: #555, @borderColor: #ccc, @backgroundColor: #f5f5f5) {
  // Set the text color
  > label,
  .help-block,
  .help-inline {
    color: @textColor;
  }
  // Style inputs accordingly
  input,
  textarea {
    color: @textColor;
    border-color: @borderColor;
    &:focus {
      border-color: darken(@borderColor, 10%);
      .box-shadow(0 0 6px lighten(@borderColor, 20%));
    }
  }
  // Give a small background color for input-prepend/-append
  .input-prepend .add-on,
  .input-append .add-on {
    color: @textColor;
    background-color: @backgroundColor;
    border-color: @textColor;
  }
}
// Error
.control-group.error {
  .formFieldState(#b94a48, #ee5f5b, lighten(#ee5f5b, 30%));
}
// Warning
.control-group.warning {
  .formFieldState(#c09853, #ccae64, lighten(#CCAE64, 5%));
}
// Success
.control-group.success {
  .formFieldState(#468847, #57a957, lighten(#57a957, 30%));
}



// FORM ACTIONS
// ------------

.form-actions {
  padding: (@baseLineHeight - 1) 20px @baseLineHeight;
  margin-top: @baseLineHeight;
  margin-bottom: @baseLineHeight;
  background-color: #f5f5f5;
  border-top: 1px solid #ddd;
}

// For text that needs to appear as an input but should not be an input
.uneditable-input {
  display: block;
  background-color: @white;
  border-color: #eee;
  .box-shadow(inset 0 1px 2px rgba(0,0,0,.025));
  cursor: not-allowed;
}

// Placeholder text gets special styles; can't be bundled together though for some reason
input:-moz-placeholder {
  color: @grayLight;
}
input::-webkit-input-placeholder {
  color: @grayLight;
}



// HELP TEXT
// ---------

.help-block {
  margin-top: 5px;
  margin-bottom: 0;
  color: @grayLight;
}

.help-inline {
  *position: relative; /* IE6-7 */
  *top: -5px; /* IE6-7 */
  display: inline;
  padding-left: 5px;
}



// INPUT GROUPS
// ------------

// Allow us to put symbols and text within the input field for a cleaner look
.input-prepend,
.input-append {
  margin-bottom: 5px;
  .clearfix(); // Clear the float to prevent wrapping
  input {
    .border-radius(0 3px 3px 0);
  }
  .add-on {
    float: left;
    display: block;
    width: auto;
    min-width: 16px;
    height: @baseLineHeight;
    margin-right: -1px;
    padding: 4px 4px 4px 5px;
    font-weight: normal;
    line-height: @baseLineHeight;
    color: @grayLight;
    text-align: center;
    text-shadow: 0 1px 0 @white;
    background-color: #f5f5f5;
    border: 1px solid #ccc;
    .border-radius(3px 0 0 3px);
  }
  .active {
    background-color: lighten(@green, 30);
    border-color: @green;
  }
}
.input-prepend {
  .add-on {
    *margin-top: 1px; /* IE6-7 */
  }
}
.input-append {
  input {
    float: left;
    .border-radius(3px 0 0 3px);
  }
  .add-on {
    margin-right: 0;
    margin-left: -1px;
    .border-radius(0 3px 3px 0);
  }
}



// SEARCH FORM
// -----------

.search-form .search-query {
  padding-left: 14px;
  padding-right: 14px;
  .border-radius(14px);
}



// HORIZONTAL & VERTICAL FORMS
// ---------------------------

// Common properties
// -----------------

.search-form,
.inline-form,
.horizontal-form {
  input,
  textarea,
  select,
  .uneditable-input {
    display: inline-block;
    margin-bottom: 0;
  }
}

// Margin to space out fieldsets
.control-group {
  margin-bottom: @baseLineHeight;
}
// Bold the labels so they stand out
.control-group > label {
  font-weight: bold;
}

// Horizontal-specific styles
// --------------------------

.horizontal-form {
  // Float the labels left
  .control-group > label {
    float: left;
    width: 130px;
    padding-top: 5px;
    text-align: right;
  }
  // Move over all input controls and content
  .controls {
    margin-left: 150px;
  }
  // Move over buttons in .form-actions to align with .controls
  .form-actions {
    padding-left: 150px;
  }
}