overleaf/services/web/frontend/stylesheets/components/forms.less

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

// Normalize non-controls
//
// Restyle and baseline non-control form elements.

fieldset {
  padding: 0;
  margin: 0;
  border: 0;
  // Chrome and Firefox set a `min-width: -webkit-min-content;` on fieldsets,
  // so we reset that to ensure it behaves more like a standard block element.
  // See https://github.com/twbs/bootstrap/issues/12359.
  min-width: 0;
}

legend {
  display: block;
  width: 100%;
  padding: 0;
  margin-bottom: @line-height-computed;
  font-size: (@font-size-base * 1.5);
  line-height: inherit;
  color: @legend-color;
  border: 0;
  border-bottom: 1px solid @legend-border-color;
}

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

  // also update .legend-as-label if changes are made to label
}

.legend-as-label {
  // display a legend like a label
  &:extend(label);
  font-size: @font-size-base;
  color: @text-color;
  border: 0;
  margin-bottom: 0;
  line-height: @line-height-01;
}

// Normalize form controls
//
// While most of our form styles require extra classes, some basic normalization
// is required to ensure optimum display with or without those classes to better
// address browser inconsistencies.

// Override content-box in Normalize (* isn't specific enough)
input[type='search'] {
  .box-sizing(border-box);
}

// 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 file controls to match text inputs
input[type='file'] {
  display: block;
}

// Make range inputs behave like textual form controls
input[type='range'] {
  display: block;
  width: 100%;
}

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

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

// Adjust output element
output {
  display: block;
  padding-top: (@padding-base-vertical + 1);
  font-size: @font-size-base;
  line-height: @line-height-base;
  color: @input-color;
}

// Common form controls
//
// Shared size and type resets for form controls. Apply `.form-control` to any
// of the following form controls:
//
// 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"]

.form-control {
  display: block;
  width: 100%;
  height: @input-height-base;
  padding: @padding-base-vertical @input-padding;
  font-size: @font-size-base;
  line-height: @line-height-base;
  color: @input-color;
  background-color: @input-bg;
  border: @input-border-size solid @input-border;
  border-radius: @input-border-radius;
  .transition(~'border-color ease-in-out .15s, box-shadow ease-in-out .15s');

  // Customize the `:focus` state to imitate native WebKit styles.
  .form-control-focus();

  // Placeholder
  .placeholder();

  // 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],
  fieldset[disabled] & {
    cursor: not-allowed;
    background-color: @input-bg-disabled;
    border-color: @input-bg-disabled;
    opacity: 1; // iOS fix for unreadable disabled content
    .placeholder(@neutral-40);
  }

  // Reset height for `textarea`s, and smaller border-radius
  textarea& {
    height: auto;
    border-radius: @border-radius-base;
  }

  // Smaller border-radius for `select` inputs
  select& {
    border-radius: @border-radius-base;
  }
}

// Search inputs in iOS
//
// This overrides the extra rounded corners on search inputs in iOS so that our
// `.form-control` class can properly style them. Note that this cannot simply
// be added to `.form-control` as it's not specific enough. For details, see
// https://github.com/twbs/bootstrap/issues/11586.

input[type='search'] {
  -webkit-appearance: none;
}

// Special styles for iOS date input
//
// In Mobile Safari, date inputs require a pixel line-height that matches the
// given height of the input.

input[type='date'] {
  line-height: @input-height-base;
}

// 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: 15px;
.form-group {
  margin-bottom: @form-group-margin-bottom;
}

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

.radio,
.checkbox {
  display: block;
  min-height: @line-height-computed; // clear the floating input if there is no label text
  margin-top: 10px;
  margin-bottom: 10px;
  padding-left: 20px;
  label {
    display: inline;
    font-weight: normal;
    cursor: pointer;
  }
}
.fake-disabled-checkbox {
  opacity: 0.5;
}
.radio input[type='radio'],
.radio-inline input[type='radio'],
.checkbox input[type='checkbox'],
.checkbox-inline input[type='checkbox'] {
  float: left;
  margin-left: -20px;
}
.radio + .radio,
.checkbox + .checkbox {
  margin-top: -5px; // Move up sibling radios or checkboxes for tighter spacing
}

// Radios and checkboxes on same line
.radio-inline,
.checkbox-inline {
  display: inline-block;
  padding-left: 20px;
  margin-bottom: 0;
  vertical-align: middle;
  font-weight: normal;
  cursor: pointer;
}
.radio-inline + .radio-inline,
.checkbox-inline + .checkbox-inline {
  margin-top: 0;
  margin-left: 10px; // space out consecutive inline controls
}

// Apply same disabled cursor tweak as for inputs
//
// Note: Neither radios nor checkboxes can be readonly.
input[type='radio'],
input[type='checkbox'],
.radio,
.radio-inline,
.checkbox,
.checkbox-inline {
  &[disabled],
  fieldset[disabled] & {
    cursor: not-allowed;
  }
}

// Form control sizing
//
// Build on `.form-control` with modifier classes to decrease or increase the
// height and font-size of form controls.

.input-sm {
  .input-size(
    @input-height-small; @padding-small-vertical; @padding-small-horizontal;
      @font-size-small; @line-height-small; @border-radius-small
  );
}

.input-lg {
  .input-size(
    @input-height-large; @padding-large-vertical; @padding-large-horizontal;
      @font-size-large; @line-height-large; @border-radius-large
  );
}

// Form control feedback states
//
// Apply contextual and semantic states to individual form controls.

.has-feedback {
  // Enable absolute positioning
  position: relative;

  // Feedback icon (requires .glyphicon classes)
  .form-control-feedback {
    position: absolute;
    top: (@line-height-computed + 5); // Height of the `label` and its margin
    right: 0;
    display: block;
    width: @input-height-base;
    height: @input-height-base;
    line-height: @input-height-base;
    text-align: center;
  }

  // Position the feedback inside the input element when there's no label
  &.hidden-label .form-control-feedback {
    margin-top: -(@line-height-computed + 5);
  }
}

.has-feedback-left {
  position: relative;
  .form-control {
    padding-left: @input-height-base;
  }
  .form-control-feedback-left {
    position: absolute;
    top: (@line-height-computed + 5); // Height of the `label` and its margin
    left: 0;
    display: block;
    width: @input-height-base;
    height: @input-height-base;
    line-height: @input-height-base;
    text-align: center;
  }
}

// Feedback states
.has-success {
  .form-control-validation(@brand-success);
}
.has-warning {
  .form-control-validation(@brand-warning);
}
.has-error {
  .form-control-validation(@brand-danger);
}

.form-control.ng-dirty.ng-invalid:not(:focus),
.form-control[data-ol-dirty]:invalid:not(:focus) {
  border-color: @state-danger-text;
  .box-shadow(
    inset 0 1px 1px rgba(0, 0, 0, 0.075)
  ); // Redeclare so transitions work
  &:focus {
    border-color: darken(@state-danger-text, 10%);
    @shadow:
      inset 0 1px 1px rgba(0, 0, 0, 0.075),
      0 0 6px lighten(@state-danger-text, 20%);
    .box-shadow(@shadow);
  }
}

// Static form control text
//
// Apply class to a `p` element to make any string of text align with labels in
// a horizontal form layout.

.form-control-static {
  margin-bottom: 0; // Remove default margin from `p`
}

// Help text
//
// Apply to any element you wish to create light text for placement immediately
// below a form control. Use for general help, formatting, or instructional text.

.help-block {
  display: block; // account for any element using help-block
  margin-top: 5px;
  margin-bottom: 10px;
  color: lighten(@text-color, 25%); // lighten the text some for contrast

  // Hide help blocks used as validation messages by default
  &.invalid-only {
    display: none;

    .has-error & {
      display: block;
    }
  }
}

// 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).
//
// Heads up! This is mixin-ed into `.navbar-form` in navbars.less.

.form-inline {
  // Kick in the inline
  @media (min-width: @screen-sm-min) {
    // Inline-block all the things for "inline"
    .form-group {
      display: inline-block;
      margin-bottom: 0;
      vertical-align: middle;
    }

    // In navbar-form, 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;
    }
    // Input groups need that 100% width though
    .input-group > .form-control {
      width: 100%;
    }

    .control-label {
      margin-bottom: 0;
      vertical-align: middle;
    }

    // Remove default margin on radios/checkboxes that were used for stacking, and
    // then undo the floating of radios and checkboxes to match (which also avoids
    // a bug in WebKit: https://github.com/twbs/bootstrap/issues/1969).
    .radio,
    .checkbox {
      display: inline-block;
      margin-top: 0;
      margin-bottom: 0;
      padding-left: 0;
      vertical-align: middle;
    }
    .radio input[type='radio'],
    .checkbox input[type='checkbox'] {
      float: none;
      margin-left: 0;
    }

    // Validation states
    //
    // Reposition the icon because it's now within a grid column and columns have
    // `position: relative;` on them. Also accounts for the grid gutter padding.
    .has-feedback .form-control-feedback {
      top: 0;
    }
  }
}

// Horizontal forms
//
// Horizontal forms are built on grid classes and allow you to create forms with
// labels on the left and inputs on the right.

.form-horizontal {
  // Consistent vertical alignment of labels, radios, and checkboxes
  .control-label,
  .radio,
  .checkbox,
  .radio-inline,
  .checkbox-inline {
    margin-top: 0;
    margin-bottom: 0;
    padding-top: (@padding-base-vertical + 1); // Default padding plus a border
  }
  // Account for padding we're adding to ensure the alignment and of help text
  // and other content below items
  .radio,
  .checkbox {
    min-height: (@line-height-computed + (@padding-base-vertical + 1));
  }

  // Make form groups behave like rows
  .form-group {
    .make-row();
  }

  .form-control-static {
    padding-top: (@padding-base-vertical + 1);
  }

  // Only right align form labels here when the columns stop stacking
  @media (min-width: @screen-sm-min) {
    .control-label {
      text-align: right;
    }
  }

  // Validation states
  //
  // Reposition the icon because it's now within a grid column and columns have
  // `position: relative;` on them. Also accounts for the grid gutter padding.
  .has-feedback .form-control-feedback {
    top: 0;
    right: (@grid-gutter-width / 2);
  }
  .has-feedback-left .form-control-feedback-left {
    top: 0;
    left: (@grid-gutter-width / 2);
  }
}

.invalid-feedback {
  display: flex;
  align-items: baseline;
  font-size: @font-size-small;
  .text-emphasis-variant(@state-danger-text);
}