Fixes #74

src/editor/widgets/Autocomplete.jsx

@@ -1,102 +1,93 @@
-import React, { Component, createRef } from 'react';
+import React, { useEffect, useRef, useState } from 'react';
 import { useCombobox } from 'downshift';
 
-export default class Autocomplete extends Component {
+const Autocomplete = props => {
 
-  constructor(props) {
-    super(props);
+  const element = useRef();
 
-    this.element = createRef();
+  const [ inputItems, setInputItems ] = useState(props.vocabulary || []);
 
-    this.state = {
-      inputItems: props.vocabulary || []
-    }
-  }
-
-  componentDidMount() {
-    if (this.element.current) {
-      if (this.props.initialValue)
-        this.element.current.querySelector('input').value = this.props.initialValue;
-
-      if (this.props.focus)
-        this.element.current.querySelector('input').focus({ preventScroll: true });
-    }
-  }
+  useEffect(() => {
+    if (props.initialValue)
+      element.current.querySelector('input').value = props.initialValue;
+
+    if (props.focus)
+      element.current.querySelector('input').focus({ preventScroll: true });
+  }, [])
 
-  onInputValueChange = ({ inputValue }) => {
+  const onInputValueChange = ({ inputValue }) => {
     if (inputValue.length > 0) {
-      const prefixMatches = this.props.vocabulary.filter(item => {
+      const prefixMatches = props.vocabulary.filter(item => {
         return item.toLowerCase().startsWith(inputValue.toLowerCase());
       });
 
-      this.setState({ inputItems: prefixMatches });
+      setInputItems(prefixMatches);
     } else {
       // ...or none, if the input is empty
-      this.setState({ inputItems: [] });
+      setInputItems([]);
     }      
   }
 
-  render() {
-
-    const {
-      isOpen,
-      getMenuProps,
-      getInputProps,
-      getComboboxProps,
-      highlightedIndex,
-      getItemProps,
-      setInputValue
-    } = useCombobox({ 
-      items: this.state.inputItems, 
-      onInputValueChange: this.onInputValueChange, 
-      onSelectedItemChange: ({ inputValue }) => {
-        onSubmit(inputValue);
-        setInputValue('');
-      } 
-    });
-
-    const onSubmit = inputValue => {
+  const {
+    isOpen,
+    getMenuProps,
+    getInputProps,
+    getComboboxProps,
+    highlightedIndex,
+    getItemProps,
+    setInputValue
+  } = useCombobox({ 
+    items: inputItems, 
+    onInputValueChange: onInputValueChange, 
+    onSelectedItemChange: ({ inputValue }) => {
+      onSubmit(inputValue);
       setInputValue('');
-      if (inputValue.trim().length > 0)
-        this.props.onSubmit(inputValue);
-    }
+    } 
+  });
 
-    const onKeyUp = evt => {
-      const { value } = evt.target;
-
-      if (evt.which == 13 && highlightedIndex == -1) {
-        onSubmit(value);
-      } else if (evt.which == 40 && value.length == 0) {
-        this.setState({ inputItems: this.props.vocabulary }); // Show all options on key down
-      } else if (evt.which == 27) {
-        this.props.onCancel && this.props.onCancel();
-      } else {
-        this.props.onChange && this.props.onChange(value);
-      }
+  const onSubmit = inputValue => {
+    setInputValue('');
+    if (inputValue.trim().length > 0)
+      props.onSubmit(inputValue);
+  }
+
+  const onKeyUp = evt => {
+    const { value } = evt.target;
+
+    if (evt.which == 13 && highlightedIndex == -1) {
+      onSubmit(value);
+    } else if (evt.which == 40 && value.length == 0) {
+      setInputItems(props.vocabulary); // Show all options on key down
+    } else if (evt.which == 27) {
+      props.onCancel && props.onCancel();
+    } else {
+      props.onChange && props.onChange(value);
     }
+  }
 
-    return (
-      <div className="r6o-autocomplete" ref={this.element}>
-        <div {...getComboboxProps()}>
-          <input 
-            {...getInputProps({ onKeyUp })}
-            placeholder={this.props.placeholder} />
-        </div>
-        <ul {...getMenuProps()}>
-          {isOpen && this.state.inputItems.map((item, index) => (
-            <li style={
-                  highlightedIndex === index
-                    ? { backgroundColor: '#bde4ff' }
-                    : {}
-                }
-                key={`${item}${index}`}
-                {...getItemProps({ item, index })}>
-              {item}
-            </li>
-          ))}
-        </ul>
+  return (
+    <div className="r6o-autocomplete" ref={element}>
+      <div {...getComboboxProps()}>
+        <input 
+          {...getInputProps({ onKeyUp })}
+          placeholder={props.placeholder} />
       </div>
-    )
-  }
+      <ul {...getMenuProps()}>
+        {isOpen && inputItems.map((item, index) => (
+          <li style={
+                highlightedIndex === index
+                  ? { backgroundColor: '#bde4ff' }
+                  : {}
+              }
+              key={`${item}${index}`}
+              {...getItemProps({ item, index })}>
+            {item}
+          </li>
+        ))}
+      </ul>
+    </div>
+  )
 
 }
+
+export default Autocomplete;