/
inline.html
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inline.html
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<!DOCTYPE html>
<html>
<head>
<title>Data Layer: Drag and Drop GeoJSON</title>
<script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
<link
href="https://unpkg.com/material-components-web@6.0.0/dist/material-components-web.css"
rel="stylesheet"
/>
<link
rel="stylesheet"
href="https://fonts.googleapis.com/icon?family=Material+Icons"
/>
<style type="text/css">
html {
height: 100%;
}
body {
height: 100%;
margin: 0;
padding: 0;
overflow: hidden;
}
#map {
height: 100%;
}
#map.over {
opacity: 0.5;
background-color: rgba(100, 100, 100, 0.5);
}
#sidebar {
flex-direction: column;
align-items: center;
justify-content: center;
overflow: auto;
}
.file {
display: flex;
flex-flow: column;
margin-top: 1em;
cursor: move;
text-align: center;
}
.file:hover .material-icons {
color: darkorange;
}
.file:hover .filename {
font-weight: bold;
}
.file .material-icons {
font-size: 50px;
color: orange;
}
.file .material-icons:hover {
color: darkorange;
}
.file .filename {
margin-top: 0.5em;
font-size: 20px;
color: #333333;
}
/* Optional: Makes the sample page fill the window. */
html,
body {
height: 100%;
margin: 0;
padding: 0;
}
#container {
height: 100%;
display: flex;
}
#sidebar {
flex-basis: 15rem;
flex-grow: 1;
padding: 1rem;
max-width: 30rem;
height: 100%;
box-sizing: border-box;
display: flex;
}
#map {
flex-basis: 0;
flex-grow: 4;
height: 100%;
}
</style>
<script>
let map;
function initMap() {
// set up the map
map = new google.maps.Map(document.getElementById("map"), {
center: new google.maps.LatLng(0, 0),
zoom: 4,
});
}
function loadGeoJsonString(geoString) {
try {
const geojson = JSON.parse(geoString);
map.data.addGeoJson(geojson);
} catch (e) {
alert("Not a GeoJSON file!");
}
zoom(map);
}
/**
* Update a map's viewport to fit each geometry in a dataset
*/
function zoom(map) {
const bounds = new google.maps.LatLngBounds();
map.data.forEach((feature) => {
const geometry = feature.getGeometry();
if (geometry) {
processPoints(geometry, bounds.extend, bounds);
}
});
map.fitBounds(bounds);
}
/**
* Process each point in a Geometry, regardless of how deep the points may lie.
*/
function processPoints(geometry, callback, thisArg) {
if (geometry instanceof google.maps.LatLng) {
callback.call(thisArg, geometry);
} else if (geometry instanceof google.maps.Data.Point) {
callback.call(thisArg, geometry.get());
} else {
geometry.getArray().forEach((g) => {
processPoints(g, callback, thisArg);
});
}
}
/* DOM (drag/drop) functions */
function initEvents() {
[...document.getElementsByClassName("file")].forEach((fileElement) => {
fileElement.addEventListener(
"dragstart",
(e) => {
e.dataTransfer.setData(
"text/plain",
JSON.stringify(files[Number(e.target.dataset.value)])
);
console.log(e);
},
false
);
});
// set up the drag & drop events
const mapContainer = document.getElementById("map");
mapContainer.addEventListener("dragenter", addClassToDropTarget, false);
mapContainer.addEventListener("dragover", addClassToDropTarget, false);
mapContainer.addEventListener("drop", handleDrop, false);
mapContainer.addEventListener(
"dragleave",
removeClassFromDropTarget,
false
);
}
function addClassToDropTarget(e) {
e.stopPropagation();
e.preventDefault();
document.getElementById("map").classList.add("over");
return false;
}
function removeClassFromDropTarget(e) {
document.getElementById("map").classList.remove("over");
}
function handleDrop(e) {
e.preventDefault();
e.stopPropagation();
removeClassFromDropTarget(e);
const files = e.dataTransfer.files;
if (files.length) {
// process file(s) being dropped
// grab the file data from each file
for (let i = 0, file; (file = files[i]); i++) {
const reader = new FileReader();
reader.onload = function (e) {
loadGeoJsonString(reader.result);
};
reader.onerror = function (e) {
console.error("reading failed");
};
reader.readAsText(file);
}
} else {
// process non-file (e.g. text or html) content being dropped
// grab the plain text version of the data
const plainText = e.dataTransfer.getData("text/plain");
console.log(plainText);
if (plainText) {
loadGeoJsonString(plainText);
}
}
// prevent drag event from bubbling further
return false;
}
function initialize() {
initMap();
initEvents();
}
const files = [
{
type: "FeatureCollection",
features: [
{
type: "Feature",
properties: {},
geometry: {
type: "Polygon",
coordinates: [
[
[-99.49218749999999, -11.867350911459294],
[24.960937499999996, -11.867350911459294],
[24.960937499999996, 47.517200697839414],
[-99.49218749999999, 47.517200697839414],
[-99.49218749999999, -11.867350911459294],
],
],
},
},
],
},
{
type: "FeatureCollection",
features: [
{
type: "Feature",
properties: {},
geometry: {
type: "Point",
coordinates: [81.2109375, 50.064191736659104],
},
},
{
type: "Feature",
properties: {},
geometry: {
type: "Point",
coordinates: [103.35937499999999, -47.98992166741417],
},
},
{
type: "Feature",
properties: {},
geometry: {
type: "Point",
coordinates: [-46.05468749999999, 64.01449619484472],
},
},
{
type: "Feature",
properties: {},
geometry: {
type: "Point",
coordinates: [-113.203125, 37.996162679728116],
},
},
{
type: "Feature",
properties: {},
geometry: {
type: "Point",
coordinates: [-73.828125, -32.249974455863295],
},
},
],
},
{
type: "FeatureCollection",
features: [
{
type: "Feature",
properties: {},
geometry: {
type: "LineString",
coordinates: [
[147.65625, -5.266007882805485],
[118.47656249999999, 43.83452678223682],
[80.85937499999999, -30.145127183376115],
[35.15625, 51.83577752045248],
[-15.468749999999998, -23.563987128451217],
[-29.53125, 44.33956524809713],
[-73.47656249999999, -32.842673631954305],
[-104.765625, 35.460669951495305],
],
},
},
],
},
];
</script>
</head>
<body>
<div id="container">
<div id="map"></div>
<div id="sidebar" class="mdc-typography">
<div class="file" draggable="true" data-value="0">
<span class="material-icons">text_snippet</span>
<div class="filename">polygons.geojson</div>
</div>
<div class="file" draggable="true" data-value="1">
<span class="material-icons">text_snippet</span>
<div class="filename">points.geojson</div>
</div>
<div class="file" draggable="true" data-value="2">
<span class="material-icons">text_snippet</span>
<div class="filename">polyline.geojson</div>
</div>
</div>
</div>
<!-- Async script executes immediately and must be after any DOM elements used in callback. -->
<script
src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initialize&libraries=&v=weekly"
async
></script>
</body>
</html>