Bootstrap/less/forms.less

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


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

// Make all forms have space below them
form {
  margin: 0 0 @baseLineHeight;
}

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

// Groups of fields with labels on top (legends)
legend {
  display: block;
  width: 100%;
  padding: 0;
  margin-bottom: @baseLineHeight;
  font-size: @baseFontSize * 1.5;
  line-height: @baseLineHeight * 2;
  color: @grayDark;
  border: 0;
  border-bottom: 1px solid #e5e5e5;

  // Small
  small {
    font-size: @baseLineHeight * .75;
    color: @grayLight;
  }
}

// Set font for forms
label,
input,
button,
select,
textarea {
  #font > .shorthand(@baseFontSize,normal,@baseLineHeight); // Set size, weight, line-height here
}
input,
button,
select,
textarea {
  font-family: @baseFontFamily; // And only set font-family here for those that need it (note the missing label element)
}

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

// 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: @inputHeight; // Make inputs at least the height of their button counterpart (base line-height + padding + border)
  padding: 6px 9px;
  margin-bottom: @baseLineHeight / 2;
  font-size: @baseFontSize;
  line-height: @baseLineHeight;
  color: @gray;
  vertical-align: middle;
  background-color: @inputBackground;
  border-radius: @inputBorderRadius;
}

// Reset appearance properties for textual inputs and textarea
// Declare width for legacy (can't be on input[type=*] selectors or it's too specific)
input,
textarea,
.uneditable-input {
  width: 220px;
}
// 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 {
  border: 1px solid @inputBorder;
  .box-shadow(inset 0 1px 1px rgba(0,0,0,.075));
  .transition(~"border linear .2s, box-shadow linear .2s");

  // 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;
}

// 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
}

// Set the height of select and file controls to match text inputs
select,
input[type="file"] {
  height: @inputHeight; /* 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: @inputHeight;
}

// Make select elements obey height by applying a border
select {
  width: 220px; // default input width + 10px of padding that doesn't get applied
  border: 1px solid @inputBorder;
}

// 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(@inputBackground, 1%);
  border-color: @inputBorder;
  .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 {
  min-height: @baseLineHeight; // clear the floating input if there is no label text
  padding-left: 20px;
}
.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: @paddingLarge;
    padding-left: 14px;
    padding-right: 14px; // TODO: Resolve this override
    font-size: @fontSizeLarge;
    border-radius: @borderRadiusLarge;
  }
  &.input-small {
    padding: @paddingSmall;
    font-size: @fontSizeSmall;
    border-radius: @borderRadiusSmall;
  }
  &.input-mini {
    padding: @paddingMini;
    font-size: @fontSizeMini;
    border-radius: @borderRadiusSmall;
  }
}



// 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(@gridColumnWidth, @gridGutterWidth, @gridRowWidth);
}

// 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: 30px;
}
// 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
input[disabled],
select[disabled],
textarea[disabled],
input[readonly],
select[readonly],
textarea[readonly] {
  cursor: not-allowed;
  background-color: @inputDisabledBackground;
}
// Explicitly reset the colors here
input[type="radio"][disabled],
input[type="checkbox"][disabled],
input[type="radio"][readonly],
input[type="checkbox"][readonly] {
  background-color: transparent;
}




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

// Warning
.control-group.warning {
  .formFieldState(@warningText, @warningText, @warningBackground);
}
// Error
.control-group.error {
  .formFieldState(@errorText, @errorText, @errorBackground);
}
// Success
.control-group.success {
  .formFieldState(@successText, @successText, @successBackground);
}
// Success
.control-group.info {
  .formFieldState(@infoText, @infoText, @infoBackground);
}

// 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: (@baseLineHeight - 1) 20px @baseLineHeight;
  margin-top: @baseLineHeight;
  margin-bottom: @baseLineHeight;
  background-color: @formActionsBackground;
  border-top: 1px solid #e5e5e5;
  .clearfix(); // Adding clearfix to allow for .pull-right button containers
}



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

.help-block,
.help-inline {
  color: lighten(@textColor, 15%); // lighten the text some for contrast
}

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

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



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

// Allow us to put symbols and text within the input field for a cleaner look
.input-append,
.input-prepend {
  margin-bottom: 5px;
  font-size: 0; // white space collapse hack
  white-space: nowrap; // Prevent span and input from separating

  // Reset the white space collapse hack
  input,
  select,
  .uneditable-input,
  .dropdown-menu {
    font-size: @baseFontSize;
  }

  input,
  select,
  .uneditable-input {
    position: relative; // placed here by default so that on :focus we can place the input above the .add-on for full border and box-shadow goodness
    float: none; // Undo the float from grid sizing
    margin: 0; // Prevent bottom margin from screwing up alignment in stacked forms
    font-size: @baseFontSize;
    vertical-align: top;
    border-radius: 0 @inputBorderRadius @inputBorderRadius 0;
    // Make input on top when focused so blue border and shadow always show
    &:focus {
      z-index: 2;
    }
  }
  input[class*="span"],
  select[class*="span"],
  .uneditable-input[class*="span"] {
    margin: 0;
  }
  .add-on {
    display: inline-block;
    width: auto;
    height: @baseLineHeight;
    min-width: 16px;
    padding: 6px;
    font-size: @baseFontSize;
    font-weight: normal;
    line-height: @baseLineHeight;
    text-align: center;
    text-shadow: 0 1px 0 @white;
    background-color: @grayLighter;
    border: 1px solid #ccc;
  }
  .add-on,
  .btn,
  .btn-group > .dropdown-toggle {
    vertical-align: top;
    border-radius: 0;
  }
  .active {
    background-color: lighten(@green, 30);
    border-color: @green;
  }
}

.input-prepend {
  .add-on,
  .btn {
    margin-right: -1px;
  }
  .add-on:first-child,
  .btn:first-child {
    // FYI, `.btn:first-child` accounts for a button group that's prepended
    border-radius: @inputBorderRadius 0 0 @inputBorderRadius;
  }
}

.input-append {
  input,
  select,
  .uneditable-input {
    border-radius: @inputBorderRadius 0 0 @inputBorderRadius;
    + .btn-group .btn,
    + .btn-group .btn:last-child {
      border-radius: 0 @inputBorderRadius @inputBorderRadius 0;
    }
  }
  .add-on,
  .btn,
  .btn-group {
    margin-left: -1px;
  }
  .add-on:last-child,
  .btn:last-child,
  .btn-group:last-child > .dropdown-toggle {
    border-radius: 0 @inputBorderRadius @inputBorderRadius 0;
  }
}

// Remove all border-radius for inputs with both prepend and append
.input-prepend.input-append {
  input,
  select,
  .uneditable-input {
    border-radius: 0;
    + .btn-group .btn {
      border-radius: 0 @inputBorderRadius @inputBorderRadius 0;
    }
  }
  .add-on:first-child,
  .btn:first-child {
    margin-right: -1px;
    border-radius: @inputBorderRadius 0 0 @inputBorderRadius;
  }
  .add-on:last-child,
  .btn:last-child {
    margin-left: -1px;
    border-radius: 0 @inputBorderRadius @inputBorderRadius 0;
  }
  .btn-group:first-child {
    margin-left: 0;
  }
}




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

input.search-query {
  padding-right: 14px;
  padding-right: 4px \9;
  padding-left: 14px;
  padding-left: 4px \9; /* IE8 doesn't have border radius, so don't indent the padding */
  margin-bottom: 0; // Remove the default margin on all inputs
  border-radius: @inputSearchBorderRadius;
}

/* Allow for input prepend/append in search forms */
.form-search .input-append .search-query,
.form-search .input-prepend .search-query {
  border-radius: 0; // Override due to specificity
}
.form-search .input-append .search-query {
  border-radius: @inputSearchBorderRadius 0 0 @inputSearchBorderRadius;
}
.form-search .input-append .btn {
  border-radius: 0 @inputSearchBorderRadius @inputSearchBorderRadius 0;
}
.form-search .input-prepend .search-query {
  border-radius: 0 @inputSearchBorderRadius @inputSearchBorderRadius 0;
}
.form-search .input-prepend .btn {
  border-radius: @inputSearchBorderRadius 0 0 @inputSearchBorderRadius;
}




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

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

.form-search,
.form-inline,
.form-horizontal {
  input,
  textarea,
  select,
  .help-inline,
  .uneditable-input,
  .input-prepend,
  .input-append {
    display: inline-block;
    margin-bottom: 0;
    vertical-align: middle;
  }
  // Re-hide hidden elements due to specifity
  .hide {
    display: none;
  }
}
.form-search label,
.form-inline label,
.form-search .btn-group,
.form-inline .btn-group {
  display: inline-block;
}
// Remove margin for input-prepend/-append
.form-search .input-append,
.form-inline .input-append,
.form-search .input-prepend,
.form-inline .input-prepend {
  margin-bottom: 0;
}
// Inline checkbox/radio labels (remove padding on left)
.form-search .radio,
.form-search .checkbox,
.form-inline .radio,
.form-inline .checkbox {
  padding-left: 0;
  margin-bottom: 0;
  vertical-align: middle;
}
// Remove float and margin, set to inline-block
.form-search .radio input[type="radio"],
.form-search .checkbox input[type="checkbox"],
.form-inline .radio input[type="radio"],
.form-inline .checkbox input[type="checkbox"] {
  float: left;
  margin-right: 3px;
  margin-left: 0;
}


// Margin to space out fieldsets
.control-group {
  margin-bottom: @baseLineHeight / 2;
}

// Legend collapses margin, so next element is responsible for spacing
legend + .control-group {
  margin-top: @baseLineHeight;
  -webkit-margin-top-collapse: separate;
}

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

.form-horizontal {
  // Increase spacing between groups
  .control-group {
    margin-bottom: @baseLineHeight;
    .clearfix();
  }
  // Float the labels left
  .control-label {
    float: left;
    width: @horizontalComponentOffset - 20;
    padding-top: 5px;
    text-align: right;
  }
  // Move over all input controls and content
  .controls {
    margin-left: @horizontalComponentOffset;
  }
  // Remove bottom margin on block level help text since that's accounted for on .control-group
  .help-block {
    margin-bottom: 0;
  }
  // And apply it only to .help-block instances that follow a form control
  input,
  select,
  textarea {
    + .help-block {
      margin-top: @baseLineHeight / 2;
    }
  }
  // Move over buttons in .form-actions to align with .controls
  .form-actions {
    padding-left: @horizontalComponentOffset;
  }
}