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.

src/autocomplete/autocomplete.js

@@ -4,7 +4,7 @@ import { createAutocomplete } from '@geocodeearth/core-js'
 import debounce from 'lodash.debounce'
 import styles, { css } from './autocomplete.module.css'
 import strings from '../strings'
-import { LocationMarker } from '../icons'
+import { LocationMarker, Loading } from '../icons'
 
 const emptyResults = {
   text: '',
@@ -18,11 +18,12 @@ export default ({
   placeholder = strings.inputPlaceholder,
   debounce: debounceWait = 300,
   onSelect: userOnSelectItem,
-  onError = () => {},
+  onError: userOnError,
   environment = window
 }) => {
   const [results, setResults] = useState(emptyResults)
   const [searchTerm, setSearchTerm] = useState('')
+  const [isLoading, setIsLoading] = useState(false)
 
   // Geocode Earth Autocomplete Client
   const autocomplete = useMemo(() => {
@@ -38,6 +39,7 @@ export default ({
         return
       }
 
+      setIsLoading(false)
       setResults({ text, features })
     })
     .catch(onError)
@@ -52,10 +54,13 @@ export default ({
     const term = inputValue.trim()
     setSearchTerm(term)
 
+    if (term === '') setIsLoading(false)
+
     // only search if the input value actually changed and not if an item was selected,
     // 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)
     }
   }
@@ -67,6 +72,14 @@ 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
 
@@ -96,6 +109,7 @@ export default ({
 
       <div {...getComboboxProps()} >
         <input {...getInputProps()} spellCheck={false} placeholder={placeholder} className={styles.input} />
+        { isLoading && <Loading className={styles.loading} /> }
       </div>
 
       <ol {...getMenuProps()} className={showResults ? styles.results : styles.resultsEmpty}>

src/autocomplete/autocomplete.module.css

@@ -25,7 +25,7 @@
   width: 100%;
   height: 45px;
   border: solid 1px rgba(255,255,255,.5);
-  padding: 8px 12px;
+  padding: 8px 55px 8px 12px; /* 12 + 31 + 12 = 55, loading spinner is 31 wide */
   border-radius: 5px;
   appearance: none;
   -webkit-appearance: none;
@@ -34,6 +34,15 @@
   box-shadow: rgba(0, 0, 0, 0.2) 0px 1px 10px 0px, rgba(0, 0, 0, 0.1) 0px 2px 4px 0px;
 }
 
+.loading {
+  position: absolute;
+  right: 12px;
+  top: 7px;
+  width: 31px;
+  height: 31px;
+  stroke: #707f8e;
+}
+
 .results {
   font-size: 16px;
   position: absolute;

src/icons.js

@@ -12,3 +12,49 @@ 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>