add loading spinner

the spinner is shown as the user types (and requests are being made) and
is hidden when a request comes back with results, as well as when an
error occurs.

to hide it on error required wrapping the user-supplied error callback
in our own function.

the color can be changed using the --loading-color variable.

example/index.html

@@ -11,10 +11,11 @@
     <div class="logo"></div>
 
     <ge-autocomplete
-      apiKey='ge-2550bcc43e8dd92e'
+      apiKey='ge-9ccf84885004f273'
       size='4'
       lang='en'
       boundary.country='de'
+      __host='api.dev.geocode.earth'
     ></ge-autocomplete>
     <pre id="result"></pre>
   </div>

src/autocomplete/autocomplete.css

@@ -29,6 +29,8 @@
     rgba(0, 0, 0, 0) 0px 0px 0px 0px,
     rgba(0, 0, 0, 0.05) 0px 1px 2px 0px;
 
+  --loading-color: var(--gray-500);
+
   --results-bg: #fff;
   --results-z-index: 10;
   --results-shadow:
@@ -75,7 +77,7 @@
   display: block;
   width: 100%;
   border: 1px solid var(--input-border-color);
-  padding: 13px 12px;
+  padding: 13px 55px 13px 12px; /* 12 + 31 + 12 = 55, loading spinner is 31 wide */;
   border-radius: var(--border-radius);
   appearance: none;
   -webkit-appearance: none;
@@ -84,6 +86,15 @@
   box-shadow: var(--input-shadow);
 }
 
+.loading {
+  position: absolute;
+  right: 12px;
+  top: 7px;
+  width: 31px;
+  height: 31px;
+  stroke: var(--loading-color);
+}
+
 .results {
   font-size: 16px;
   position: absolute;

src/autocomplete/autocomplete.js

@@ -4,7 +4,7 @@ import { createAutocomplete } from '@geocodeearth/core-js'
 import debounce from 'lodash.debounce'
 import css from './autocomplete.css'
 import strings from '../strings'
-import { LocationMarker } from '../icons'
+import { LocationMarker, Loading } from '../icons'
 
 const emptyResults = {
   text: '',
@@ -20,10 +20,11 @@ export default ({
   debounce: debounceWait = 300,
   onSelect: userOnSelectItem,
   onChange: userOnChange,
-  onError = () => {},
+  onError: userOnError,
   environment = window
 }) => {
   const [results, setResults] = useState(emptyResults)
+  const [isLoading, setIsLoading] = useState(false)
   const inputRef = useRef()
 
   // Geocode Earth Autocomplete Client
@@ -40,6 +41,7 @@ export default ({
         return
       }
 
+      setIsLoading(false)
       setResults({ text, features })
     })
     .catch(onError)
@@ -53,6 +55,7 @@ export default ({
   const onInputValueChange = ({ type, inputValue }) => {
     const term = inputValue.trim()
     if (term === '') {
+      setIsLoading(false)
       setResults(emptyResults)
     }
 
@@ -65,6 +68,7 @@ export default ({
     // which also fires this callback. this prevents an additional request after the user has already
     // selected an item.
     if (type === useCombobox.stateChangeTypes.InputChange && term.length > 0) {
+      setIsLoading(true)
       debouncedSearch(term)
     }
   }
@@ -76,6 +80,14 @@ export default ({
     }
   }
 
+  // call user-supplied error callback
+  const onError = (error) => {
+    setIsLoading(false) // hide loading indicator as this normally happens after a successful request
+    if (typeof userOnError === 'function') {
+      userOnError(error)
+    }
+  }
+
   // turns an autocomplete result (feature) into a string
   const itemToString = ({ properties: { label } }) => label
 
@@ -112,6 +124,7 @@ export default ({
 
       <div {...getComboboxProps()} >
         <input {...getInputProps({ref: inputRef})} spellCheck={false} placeholder={placeholder} className='input' />
+        {isLoading && <Loading className={'loading'} />}
       </div>
 
       <ol {...getMenuProps()} className={showResults ? 'results' : 'results-empty'}>

src/icons.js

@@ -12,3 +12,48 @@ export const LocationMarker = ({className}) =>
     <path fillRule="evenodd" d="M5.05 4.05a7 7 0 119.9 9.9L10 18.9l-4.95-4.95a7 7 0 010-9.9zM10 11a2 2 0 100-4 2 2 0 000 4z" clipRule="evenodd" />
   </svg>
 
+/**
+ * SVG Loaders (github.com/SamHerbert/SVG-Loaders)
+ * Copyright (c) 2014 Sam Herbert
+ *
+ * @license MIT
+ */
+
+// this is the `puff` loader
+export const Loading = ({ className }) =>
+  <svg width="44" height="44" viewBox="0 0 44 44" xmlns="http://www.w3.org/2000/svg" stroke="currentColor" className={className}>
+    <g fill="none" fillRule="evenodd" strokeWidth="2">
+      <circle cx="22" cy="22" r="1">
+        <animate attributeName="r"
+          begin="0s" dur="1.4s"
+          values="1; 20"
+          calcMode="spline"
+          keyTimes="0; 1"
+          keySplines="0.165, 0.84, 0.44, 1"
+          repeatCount="indefinite" />
+        <animate attributeName="stroke-opacity"
+          begin="0s" dur="1.4s"
+          values="1; 0"
+          calcMode="spline"
+          keyTimes="0; 1"
+          keySplines="0.3, 0.61, 0.355, 1"
+          repeatCount="indefinite" />
+      </circle>
+      <circle cx="22" cy="22" r="1">
+        <animate attributeName="r"
+          begin="-0.7s" dur="1.4s"
+          values="1; 20"
+          calcMode="spline"
+          keyTimes="0; 1"
+          keySplines="0.165, 0.84, 0.44, 1"
+          repeatCount="indefinite" />
+        <animate attributeName="stroke-opacity"
+          begin="-0.7s" dur="1.4s"
+          values="1; 0"
+          calcMode="spline"
+          keyTimes="0; 1"
+          keySplines="0.3, 0.61, 0.355, 1"
+          repeatCount="indefinite" />
+      </circle>
+    </g>
+  </svg>