Add postcode search box

app/src/frontend/map.js

@@ -3,10 +3,12 @@ import { Map, TileLayer, ZoomControl, AttributionControl } from 'react-leaflet-u
 
 import '../../node_modules/leaflet/dist/leaflet.css'
 import './map.css'
-import ThemeSwitcher from './theme-switcher';
-import { parseCategoryURL } from '../parse';
-import Legend from './legend';
+
 import { HelpIcon } from './icons';
+import Legend from './legend';
+import { parseCategoryURL } from '../parse';
+import SearchBox from './search-box';
+import ThemeSwitcher from './theme-switcher';
 
 const OS_API_KEY = 'NVUxtY5r8eA6eIfwrPTAGKrAAsoeI9E9';
 
@@ -24,9 +26,18 @@ class ColouringMap extends Component {
             zoom: 16
         };
         this.handleClick = this.handleClick.bind(this);
+        this.handleLocate = this.handleLocate.bind(this);
         this.themeSwitch = this.themeSwitch.bind(this);
     }
 
+    handleLocate(lat, lng, zoom){
+        this.setState({
+            lat: lat,
+            lng: lng,
+            zoom: zoom
+        })
+    }
+
     handleClick(e) {
         const is_edit = this.props.match.url.match('edit')
         const mode = is_edit? 'edit': 'view';
@@ -132,6 +143,11 @@ class ColouringMap extends Component {
                 }
                 <Legend slug={cat} />
                 <ThemeSwitcher onSubmit={this.themeSwitch} currentTheme={this.state.theme} />
+                {
+                    this.props.match.url !== '/'? (
+                        <SearchBox onLocate={this.handleLocate} is_building={is_building} />
+                    ) : null
+                }
             </Fragment>
         );
     }

app/src/frontend/search-box.css

@@ -0,0 +1,29 @@
+.search-box {
+    position: absolute;
+    top: 3.625rem;
+    left: 25.5rem;
+    z-index: 1000;
+}
+.building.search-box {
+    top: 0.5rem;
+}
+.search-box form,
+.search-box .search-box-results {
+    border-radius: 4px;
+    background: #fff;
+    box-shadow: 0px 0px 1px 1px #222222;
+}
+.search-box button {
+    margin-bottom: 0;
+}
+.search-box .search-box-results {
+    margin-top: 0.25rem;
+    list-style: none;
+    padding: 0;
+    overflow: hidden;
+}
+.search-box-result {
+    display: block;
+    padding: 0.25rem 0.5rem;
+    border-bottom: 1px solid #eee;
+}

app/src/frontend/search-box.js

@@ -0,0 +1,111 @@
+import React, { Component } from 'react';
+
+import './search-box.css';
+
+/**
+ * Search for location
+ */
+class SearchBox extends Component {
+
+    constructor(props) {
+        super(props);
+        this.state = {
+            q: "",
+            results: [],
+            fetching: false
+        }
+        this.handleChange = this.handleChange.bind(this);
+        this.search = this.search.bind(this);
+    }
+
+    // Update search term
+    handleChange(e) {
+        this.setState({
+            q: e.target.value
+        })
+    }
+
+    // Query search endpoint
+    search(e) {
+        e.preventDefault();
+        this.setState({
+            fetching: true
+        })
+
+        fetch(
+            '/search?q='+this.state.q
+        ).then(
+            (res) => res.json()
+        ).then((data) => {
+            if (data && data.results){
+                this.setState({
+                    results: data.results,
+                    fetching: false
+                })
+            } else {
+                console.error(data);
+
+                this.setState({
+                    results: [],
+                    fetching: false
+                })
+            }
+        }).catch((err) => {
+                console.error(err)
+
+                this.setState({
+                    results: [],
+                    fetching: false
+                })
+        })
+    }
+
+    render() {
+        const resultsList = this.state.results.length?
+            <ul className="search-box-results">
+            {
+                this.state.results.map((result) => {
+                    const label = result.attributes.label;
+                    const lng = result.geometry.coordinates[0];
+                    const lat = result.geometry.coordinates[1];
+                    const zoom = result.attributes.zoom;
+                    const href = `?lng=${lng}&lat=${lat}&zoom=${zoom}`
+                    return (
+                        <li key={result.attributes.label}>
+                            <a
+                                className="search-box-result"
+                                onClick={(e) => {
+                                    e.preventDefault();
+                                    this.props.onLocate(lat, lng, zoom);
+                                }}
+                                href={href}
+                                >{`${label.substring(0,4)} ${label.substring(4, 7)}`}</a>
+                        </li>
+                    )
+                })
+            }
+            </ul>
+        : null;
+        return (
+            <div className={`search-box ${this.props.is_building? "building" : ""}`}>
+                <form action="/search" method="GET" onSubmit={this.search}
+                    class="form-inline">
+                    <input
+                        className="form-control"
+                        type="search"
+                        id="search-box-q"
+                        name="q"
+                        value={this.state.q}
+                        placeholder="Search for a postcode"
+                        aria-label="Search for a postcode"
+                        onChange={this.handleChange}
+                        />
+                    <button class="btn btn-outline-dark" type="submit">Search</button>
+                </form>
+                { resultsList }
+            </div>
+        )
+    }
+}
+
+export default SearchBox;