Created
October 21, 2019 14:12
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Scrape the current page for h-geo data and plot the result as a polyline on a Stamen watercolour map.
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| (function (win, doc) { | |
| win.addEventListener('load', function() { | |
| var latlons = []; | |
| doc.querySelectorAll('.h-geo').forEach( function(geo) { | |
| var lat = geo.querySelector('data.p-latitude').getAttribute('value'); | |
| var lon = geo.querySelector('data.p-longitude').getAttribute('value'); | |
| if (lat && lon) { | |
| latlons.push([lat, lon]); | |
| } | |
| }); | |
| if (latlons.length > 2) { | |
| var div = doc.createElement('div'); | |
| div.setAttribute('id', 'map'); | |
| div.style.height = '50vh'; | |
| doc.querySelector('aside').appendChild(div); | |
| var link = doc.createElement('link'); | |
| link.setAttribute('rel', 'stylesheet'); | |
| link.setAttribute('href', '/leaflet/leaflet.css'); | |
| doc.head.appendChild(link); | |
| var script = doc.createElement('script'); | |
| script.setAttribute('src', '/leaflet/leaflet.js'); | |
| doc.head.appendChild(script); | |
| script.addEventListener('load', function() { | |
| var map = L.map(document.getElementById('map'), { zoom: 12 }); | |
| L.tileLayer('https://stamen-tiles-{s}.a.ssl.fastly.net/watercolor/{z}/{x}/{y}.png').addTo(map); | |
| var polyline = L.polyline(latlons, { | |
| color: '#b52', | |
| weight: 5, | |
| opacity: 0.75 | |
| }).addTo(map); | |
| map.fitBounds(polyline.getBounds()); | |
| latlons.forEach( function(latlon) { | |
| L.circle([latlon[0], latlon[1]], { | |
| color: '#b52', | |
| weight: 10, | |
| opacity: 0.5 | |
| }).addTo(map); | |
| }); | |
| }) | |
| } | |
| }); | |
| }(this, this.document)); |
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