Autocomplete dropdown for relations editor

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "@recogito/recogito-client-core",
-  "version": "0.1.5",
+  "version": "0.1.6",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -2315,6 +2315,11 @@
         }
       }
     },
+    "compute-scroll-into-view": {
+      "version": "1.0.14",
+      "resolved": "https://registry.npmjs.org/compute-scroll-into-view/-/compute-scroll-into-view-1.0.14.tgz",
+      "integrity": "sha512-mKDjINe3tc6hGelUMNDzuhorIUZ7kS7BwyY0r2wQd2HOH2tRuJykiC06iSEX8y1TuhNzvz4GcJnK16mM2J1NMQ=="
+    },
     "concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
@@ -2804,6 +2809,27 @@
       "integrity": "sha512-jnjyiM6eRyZl2H+W8Q/zLMA481hzi0eszAaBUzIVnmYVDBbnLxVNnfu1HgEBvCbL+71FrxMl3E6lpKH7Ge3OXA==",
       "dev": true
     },
+    "downshift": {
+      "version": "5.4.6",
+      "resolved": "https://registry.npmjs.org/downshift/-/downshift-5.4.6.tgz",
+      "integrity": "sha512-GtSCmZUQMulQQ0gX3N3jvUAABJNU8IfAMLzFLu0E2fcOTt98xropy0iriYW2PSClRUqJ4QwKAov7FDy9Gk9aOA==",
+      "requires": {
+        "@babel/runtime": "^7.10.2",
+        "compute-scroll-into-view": "^1.0.14",
+        "prop-types": "^15.7.2",
+        "react-is": "^16.13.1"
+      },
+      "dependencies": {
+        "@babel/runtime": {
+          "version": "7.10.4",
+          "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.10.4.tgz",
+          "integrity": "sha512-UpTN5yUJr9b4EX2CnGNWIvER7Ab83ibv0pcvvHc4UOdrBI5jb8bj+32cCwPX6xu0mt2daFNjYhoi+X7beH0RSw==",
+          "requires": {
+            "regenerator-runtime": "^0.13.4"
+          }
+        }
+      }
+    },
     "duplexify": {
       "version": "3.7.1",
       "resolved": "https://registry.npmjs.org/duplexify/-/duplexify-3.7.1.tgz",

package.json

@@ -42,6 +42,7 @@
   },
   "dependencies": {
     "axios": "^0.19.0",
+    "downshift": "^5.4.6",
     "node-polyglot": "^2.4.0",
     "preact": "^10.4.1",
     "react-contenteditable": "^3.3.3",

src/relations/editor/RelationAutocomplete.js

@@ -0,0 +1,55 @@
+import React, { useState, useEffect, useRef } from 'react'
+import { useCombobox } from 'downshift'
+
+const RelationAutocomplete = props => {
+
+  const element = useRef();
+
+  const [ inputItems, setInputItems ] = useState(props.vocabulary);
+
+  useEffect(() =>
+    element.current?.querySelector('input').focus(), []);
+
+  const onInputValueChange = ({ inputValue }) => {
+    props.onChange(inputValue);
+    setInputItems(
+      props.vocabulary.filter(item =>
+        item.toLowerCase().startsWith(inputValue.toLowerCase())))
+  }
+
+  const {
+    isOpen,
+    getMenuProps,
+    getInputProps,
+    getComboboxProps,
+    highlightedIndex,
+    getItemProps,
+  } = useCombobox({ items: inputItems, onInputValueChange });
+
+  return (
+    <div ref={element}>
+      <div {...getComboboxProps()}>
+        <input 
+          {...getInputProps({ onKeyDown: evt => { if (!isOpen) props.onKeyDown(evt); } })}
+          placeholder={props.placeholder}  
+          value={props.content} />
+      </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 RelationAutocomplete;

src/relations/editor/RelationEditor.jsx

@@ -1,6 +1,6 @@
 import React, { Component } from 'preact/compat';
-import ContentEditable from 'react-contenteditable';
 import { TrashIcon, CheckIcon } from '../../Icons';
+import RelationAutocomplete from './RelationAutocomplete';
 
 /**
  * Shorthand to get the label (= first tag body value) from the
@@ -54,13 +54,11 @@ export default class RelationEditor extends Component {
 
       el.style.top = `${midY}px`;
       el.style.left = `${midX}px`;
-
-      setTimeout(() => el.querySelector('.input').focus(), 0);
     }
   }
 
-  onChange = evt =>
-    this.setState({ content: evt.target.value });
+  onChange = value =>
+    this.setState({ content: value });
 
   onKeyDown = evt => {
     if (evt.which === 13) { // Enter = Submit
@@ -103,13 +101,12 @@ export default class RelationEditor extends Component {
     return(
       <div className="r6o-relation-editor" ref={this.element}>
         <div className="input-wrapper">
-          <ContentEditable
-            className="input"
-            html={this.state.content}
-            data-placeholder="Tag..."
+          <RelationAutocomplete 
+            content={this.state.content}
+            placeholder="Tag..."
             onChange={this.onChange}
-            onKeyDown={this.onKeyDown}
-          />
+            onKeyDown={this.onKeyDown} 
+            vocabulary={this.props.vocabulary || []} />
         </div>
 
         <div className="buttons">

themes/default/relations/_editor.scss

@@ -14,30 +14,56 @@
   }
 
   * {
-    line-height:31px;
     box-sizing:border-box;
   }
 
   .input-wrapper {
     height:34px;
-    padding:10px 6px;
+    padding:0 6px;
     margin-right:68px;
     font-size:14px;
-    min-width:80px;
     background-color:$blueish-white;
     cursor:text;
     @include rounded-corners-left(3px);
-  }
 
-  .input {
-    outline:none;
-    line-height:14px;
-    white-space:pre;
-  }
+    div[role=combobox] {
+      height:34px;
+    }
 
-  .input:empty:before {
-    content:attr(data-placeholder);
-    color:darken($lightgrey-border-darker, 15%);
+    input {
+      outline:none;
+      border:none;
+      width:80px;
+      height:100%;
+      line-height:14px;
+      white-space:pre;
+      box-sizing:border-box;
+      background-color:transparent;
+      font-size:14px;
+      color:$standard-type;
+    }
+
+    ul {
+      position:relative;
+      left:-6px;
+      margin:0;
+      padding:0;
+      list-style-type:none;
+      background-color:#fff;
+      min-width:100%;
+      border-radius:3px;
+      border:1px solid #d6d7d9;
+      box-sizing:border-box;
+      box-shadow:0 0 20px rgba(0,0,0,0.25);
+    }
+
+    li {
+      box-sizing:border-box;
+      padding:2px 12px;
+      width:100%;
+      cursor:pointer;
+    }
+  
   }
 
   .buttons {