Custom range input

docs/4.0/components/forms.md

@@ -1171,6 +1171,29 @@ As is the `size` attribute:
 </select>
 {% endexample %}
 
+### Range
+
+Create custom `<input type="range">` controls with `.custom-range`. The track (the background) and thumb (the value) are both styled to appear the same across browsers. As only IE and Firefox support "filling" their track from the left or right of the thumb as a means to visually indicate progress, we do not currently support it.
+
+{% example html %}
+<label for="customRange1">Example range</label>
+<input type="range" class="custom-range" id="customRange1">
+{% endexample %}
+
+Range inputs have implicit values for `min` and `max`—`0` and `100`, respectively. You may specify new values for those using the `min` and `max` attributes.
+
+{% example html %}
+<label for="customRange2">Example range</label>
+<input type="range" class="custom-range" min="0" max="5" id="customRange2">
+{% endexample %}
+
+By default, range inputs "snap" to integer values. To change this, you can specify a `step` value. In the example below, we double the number of steps by using `step="0.5"`.
+
+{% example html %}
+<label for="customRange3">Example range</label>
+<input type="range" class="custom-range" min="0" max="5" step="0.5" id="customRange3">
+{% endexample %}
+
 ### File browser
 
 The file input is the most gnarly of the bunch and requires additional JavaScript if you'd like to hook them up with functional *Choose file...* and selected file name text.

scss/_custom-forms.scss

@@ -295,3 +295,120 @@
     @include border-radius(0 $custom-file-border-radius $custom-file-border-radius 0);
   }
 }
+
+// Range
+//
+// Style range inputs the same across browsers. Vendor-specific rules for psuedo
+// elements cannot be mixed. As such, there are no shared styles for focus or
+// active states on prefixed selectors.
+
+.custom-range {
+  width: 100%;
+  padding-left: 0; // Firefox specific
+  background-color: transparent;
+  appearance: none;
+
+  &:focus {
+    outline: none;
+  }
+
+  &::-moz-focus-outer {
+    border: 0;
+  }
+
+  &::-webkit-slider-thumb {
+    width: $custom-control-indicator-size;
+    height: $custom-control-indicator-size;
+    margin-top: -($custom-control-indicator-size * .25);
+    @include gradient-bg($custom-control-indicator-checked-bg);
+    border: 0;
+    border-radius: $custom-control-indicator-size;
+    appearance: none;
+
+    &:focus {
+      outline: none;
+      box-shadow: $custom-control-indicator-focus-box-shadow;
+    }
+
+    &:active {
+      @include gradient-bg($custom-control-indicator-active-bg);
+    }
+  }
+
+  &::-webkit-slider-runnable-track {
+    width: 100%;
+    height: $custom-control-indicator-size * .5;
+    color: transparent;
+    cursor: pointer;
+    background-color: $custom-control-indicator-bg;
+    border-color: transparent;
+    border-radius: $custom-control-indicator-size;
+  }
+
+  &::-moz-range-thumb {
+    width: $custom-control-indicator-size;
+    height: $custom-control-indicator-size;
+    @include gradient-bg($custom-control-indicator-checked-bg);
+    border: 0;
+    border-radius: $custom-control-indicator-size;
+    appearance: none;
+
+    &:focus {
+      outline: none;
+      box-shadow: $custom-control-indicator-focus-box-shadow;
+    }
+
+    &:active {
+      @include gradient-bg($custom-control-indicator-active-bg);
+    }
+  }
+
+  &::-moz-range-track {
+    width: 100%;
+    height: $custom-control-indicator-size * .5;
+    color: transparent;
+    cursor: pointer;
+    background-color: $custom-control-indicator-bg;
+    border-color: transparent;
+    border-radius: $custom-control-indicator-size;
+  }
+
+  &::-ms-thumb {
+    width: $custom-control-indicator-size;
+    height: $custom-control-indicator-size;
+    @include gradient-bg($custom-control-indicator-checked-bg);
+    border: 0;
+    border-radius: $custom-control-indicator-size;
+    appearance: none;
+
+    &:focus {
+      outline: none;
+      box-shadow: $custom-control-indicator-focus-box-shadow;
+    }
+
+    &:active {
+      @include gradient-bg($custom-control-indicator-active-bg);
+    }
+  }
+
+  &::-ms-track {
+    width: 100%;
+    height: $custom-control-indicator-size * .5;
+    color: transparent;
+    cursor: pointer;
+    background-color: transparent;
+    border-color: transparent;
+    border-width: ($custom-control-indicator-size * .5);
+  }
+
+  &::-ms-fill-lower {
+    background-color: $custom-control-indicator-bg;
+    border-radius: $custom-control-indicator-size;
+  }
+
+  &::-ms-fill-upper {
+    margin-right: 15px;
+    background-color: $custom-control-indicator-bg;
+    border-radius: $custom-control-indicator-size;
+  }
+}