Bootstrap/less/forms.less

//
// Forms
// --------------------------------------------------


// Non-controls
// -------------------------

form {
  margin: 0 0 @line-height-base;
}

fieldset {
  padding: 0;
  margin: 0;
  border: 0;
}

legend {
  display: block;
  width: 100%;
  padding: 0;
  margin-bottom: @line-height-base;
  font-size: @font-size-base * 1.5;
  line-height: @line-height-base * 2;
  color: @grayDark;
  border: 0;
  border-bottom: 1px solid #e5e5e5;
}

label {
  display: inline-block;
  margin-bottom: 5px;
  font-weight: bold;
}

// Form controls
// -------------------------

// Shared size and type resets
select,
textarea,
input[type="text"],
input[type="password"],
input[type="datetime"],
input[type="datetime-local"],
input[type="date"],
input[type="month"],
input[type="time"],
input[type="week"],
input[type="number"],
input[type="email"],
input[type="url"],
input[type="search"],
input[type="tel"],
input[type="color"],
.uneditable-input {
  display: inline-block;
  .box-sizing(border-box); // Makes inputs behave like true block-level elements
  min-height: @input-height; // Make inputs at least the height of their button counterpart (base line-height + padding + border)
  padding: 6px 9px;
  margin-bottom: @line-height-base / 2;
  font-size: @font-size-base;
  line-height: @line-height-base;
  color: @gray;
  vertical-align: middle;
  background-color: @input-background;
  border: 1px solid @input-border;
  border-radius: @input-border-radius;
  .box-shadow(inset 0 1px 1px rgba(0,0,0,.075));
  .transition(~"border linear .2s, box-shadow linear .2s");
}

// Reset appearance properties for textual inputs and textarea
// Can't be on input[type=*] selectors or it's too specific
input,
select,
textarea,
.uneditable-input {
  width: 100%;
}

// Reset width of input images, buttons, radios, checkboxes
input[type="file"],
input[type="image"],
input[type="submit"],
input[type="reset"],
input[type="button"],
input[type="radio"],
input[type="checkbox"] {
  width: auto; // Override of generic input selector
}

// Reset height since textareas have rows
textarea {
  height: auto;
}

// Everything else
textarea,
input[type="text"],
input[type="password"],
input[type="datetime"],
input[type="datetime-local"],
input[type="date"],
input[type="month"],
input[type="time"],
input[type="week"],
input[type="number"],
input[type="email"],
input[type="url"],
input[type="search"],
input[type="tel"],
input[type="color"],
.uneditable-input {
  // Focus state
  &:focus {
    border-color: rgba(82,168,236,.8);
    outline: 0;
    outline: thin dotted \9; /* IE6-9 */
    .box-shadow(~"inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px rgba(82,168,236,.6)");
  }
}

// Position radios and checkboxes better
input[type="radio"],
input[type="checkbox"] {
  margin: 4px 0 0;
  margin-top: 1px \9; /* IE8-9 */
  line-height: normal;
}

// Set the height of select and file controls to match text inputs
select,
input[type="file"] {
  height: @input-height; /* In IE7, the height of the select element cannot be changed by height, only font-size. TODO: Check if this is still needed when dropping IE7 support */
  line-height: @input-height;
}

// Make select elements obey height by applying a border
// TODO: See if this can be part of the above selector stack
select {
  border: 1px solid @input-border;
}

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

// Focus for select, file, radio, and checkbox
select:focus,
input[type="file"]:focus,
input[type="radio"]:focus,
input[type="checkbox"]:focus {
  .tab-focus();
}


// Uneditable inputs
// -------------------------

// Make uneditable inputs look inactive
.uneditable-input,
.uneditable-textarea {
  color: @grayLight;
  background-color: darken(@input-background, 1%);
  border-color: @input-border;
  .box-shadow(inset 0 1px 2px rgba(0,0,0,.025));
  cursor: not-allowed;
}

// For text that needs to appear as an input but should not be an input
.uneditable-input {
  overflow: hidden; // prevent text from wrapping, but still cut it off like an input does
  white-space: nowrap;
}

// Make uneditable textareas behave like a textarea
.uneditable-textarea {
  width: auto;
  height: auto;
}


// Placeholder
// -------------------------

// Placeholder text gets special styles because when browsers invalidate entire lines if it doesn't understand a selector
input,
textarea {
  .placeholder();
}


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

// Indent the labels to position radios/checkboxes as hanging
.radio,
.checkbox {
  display: block;
  min-height: @line-height-base; // clear the floating input if there is no label text
  padding-left: 20px;
}
.radio label,
.checkbox label {
  margin-bottom: 0;
  font-weight: normal;
}
.radio input[type="radio"],
.checkbox input[type="checkbox"] {
  float: left;
  margin-left: -20px;
}

// Move the options list down to align with labels
.controls > .radio:first-child,
.controls > .checkbox:first-child {
  padding-top: 5px; // has to be padding because margin collaspes
}

// Radios and checkboxes on same line
// TODO v3: Convert .inline to .control-inline
.radio.inline,
.checkbox.inline {
  display: inline-block;
  padding-top: 5px;
  margin-bottom: 0;
  vertical-align: middle;
}
.radio.inline + .radio.inline,
.checkbox.inline + .checkbox.inline {
  margin-left: 10px; // space out consecutive inline controls
}



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

select,
textarea,
input[type="text"],
input[type="password"],
input[type="datetime"],
input[type="datetime-local"],
input[type="date"],
input[type="month"],
input[type="time"],
input[type="week"],
input[type="number"],
input[type="email"],
input[type="url"],
input[type="search"],
input[type="tel"],
input[type="color"],
.uneditable-input {
  &.input-large {
    padding: @padding-large;
    padding-left: 14px;
    padding-right: 14px; // TODO: Resolve this override
    font-size: @font-size-large;
    border-radius: @border-radius-large;
  }
  &.input-small {
    padding: @padding-small;
    font-size: @font-size-small;
    border-radius: @border-radius-small;
  }
  &.input-mini {
    padding: @padding-mini;
    font-size: @font-size-mini;
    border-radius: @border-radius-small;
  }
}



// GRID SIZING FOR INPUTS
// ----------------------

// Grid style input sizes
input[class*="span"],
select[class*="span"],
textarea[class*="span"],
.uneditable-input[class*="span"] {
  float: none;
  margin-left: 0;
  margin-right: 0;
}

.controls-row {
  #grid > .input(@grid-column-width, @grid-gutter-width, @grid-row-width);
}

// Ensure input-prepend/append never wraps
.input-append input[class*="span"],
.input-append .uneditable-input[class*="span"],
.input-prepend input[class*="span"],
.input-prepend .uneditable-input[class*="span"] {
  display: inline-block;
}

input[class*="span"],
select[class*="span"],
textarea[class*="span"],
.uneditable-input[class*="span"] {
  height: @input-height;
}
// Control row for multiple inputs per line
.controls-row {
  .clearfix(); // Clear the float from controls
}

// Float to collapse white-space for proper grid alignment
.controls-row [class*="span"] {
  float: left;
}
// Explicity set top padding on all checkboxes/radios, not just first-child
.controls-row .checkbox[class*="span"],
.controls-row .radio[class*="span"] {
  padding-top: 5px;
}




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

// Disabled and read-only inputs
// Note: HTML5 says that inputs 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.
input,
select,
textarea {
  &[disabled],
  &[readonly],
  fieldset[disabled] & {
    cursor: not-allowed;
    background-color: @input-background-disabled;
  }
}
// Explicitly reset the colors here
input[type="radio"],
input[type="checkbox"] {
  &[disabled],
  &[readonly],
  fieldset[disabled] & {
    background-color: transparent;
  }
}




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

// Warning
.control-group.warning {
  .formFieldState(@state-warning-text, @state-warning-text, @state-warning-background);
}
// Error
.control-group.error {
  .formFieldState(@state-error-text, @state-error-text, @state-error-background);
}
// Success
.control-group.success {
  .formFieldState(@state-success-text, @state-success-text, @state-success-background);
}
// Success
.control-group.info {
  .formFieldState(@state-info-text, @state-info-text, @state-info-background);
}

// HTML5 invalid states
// Shares styles with the .control-group.error above
input:focus:invalid,
textarea:focus:invalid,
select:focus:invalid {
  color: #b94a48;
  border-color: #ee5f5b;
  &:focus {
    border-color: darken(#ee5f5b, 10%);
    @shadow: 0 0 6px lighten(#ee5f5b, 20%);
    .box-shadow(@shadow);
  }
}



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

.form-actions {
  padding: (@line-height-base - 1) 20px @line-height-base;
  margin-top: @line-height-base;
  margin-bottom: @line-height-base;
  background-color: @form-actions-background;
  border-top: 1px solid #e5e5e5;
  .clearfix(); // Adding clearfix to allow for .pull-right button containers
}



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

.help-block,
.help-inline {
  color: lighten(@text-color, 25%); // lighten the text some for contrast
}

.help-block {
  display: block; // account for any element using help-block
  margin-bottom: @line-height-base / 2;
}

.help-inline {
  display: inline-block;
  vertical-align: middle;
  padding-left: 5px;
}




// Input groups
// --------------------------------------------------

// Base styles
// -------------------------
.input-group {
  display: table;

  // Undo padding and float of grid classes
  &[class*="span"] {
    float: none;
    padding: 0;
  }

  input,
  select,
  .uneditable-input {
    width: 100%;
  }
}

// Display as table-cell
// -------------------------
.input-group-addon,
.input-group-btn,
.input-group input,
.input-group .uneditable-input {
  display: table-cell;
  margin: 0;
  border-radius: 0;
}
// Addon and addon wrapper for buttons
.input-group-addon,
.input-group-btn {
  width: 1%;
  vertical-align: middle; // Match the inputs
}

// Text input groups
// -------------------------
.input-group-addon {
  .box-sizing(border-box);
  padding: 6px 8px;
  font-size: @font-size-base;
  font-weight: normal;
  line-height: @line-height-base;
  text-align: center;
  text-shadow: 0 1px 0 #fff;
  background-color: @grayLighter;
  border: 1px solid #ccc;
}

// Reset rounded corners
.input-group input:first-child,
.input-group .uneditable-input:first-child,
.input-group-addon:first-child {
  .border-left-radius(@border-radius-base);
}
.input-group-addon:first-child {
  border-right: 0;
}
.input-group input:last-child,
.input-group .uneditable-input:last-child,
.input-group-addon:last-child {
  .border-right-radius(@border-radius-base);
}
.input-group-addon:last-child {
  border-left: 0;
}

// Button input groups
// -------------------------
.input-group-btn,
.input-group-btn .btn {
  white-space: nowrap;
}
.input-group-btn > .btn {
  float: left; // Collapse white-space
  border-radius: 0;
  + .btn {
    border-left: 0;
  }
}
.input-group-btn.btn-group {
  display: table-cell;
}
// Prepend
.input-group-btn {
  &:first-child > .btn,
  &.btn-group:first-child > .btn {
    border-right: 0;
  }
  &:first-child > .btn,
  &.btn-group:first-child > .btn {
    border-radius: @border-radius-base 0 0 @border-radius-base;
  }
}
// Append
.input-group-btn {
  &:last-child > .btn,
  &.btn-group:last-child > .btn:first-child {
    border-left: 0;
  }
  &:last-child > .btn,
  &.btn-group:last-child > .btn {
    border-radius: 0 @border-radius-base @border-radius-base 0;
  }
}