132 lines
3.3 KiB
ReStructuredText
132 lines
3.3 KiB
ReStructuredText
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**********************
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Leaflet and PHP
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**********************
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.. contents:: Table of Contents
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Access
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=================
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A web application employing PostGIS, PHP, and LeafletJS.
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This application uses the PHP-Database-GeoJSON file from https://github.com/bmcbride/PHP-Database-GeoJSON
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It can be access via http://domain.com/LeafletPHPDemo.html
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.. image:: _static/leaflet-geojson-europe.png
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Initialize
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=================
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If you any issues connecting to PostGIS, check line 12 of get-json.phpbelow:
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$conn = new PDO('pgsql:host=localhost;dbname=postgisftw','pgis','<YourPgisPassword>');
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Replace <YourPgisPassword> with the password for user pgis.
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The password for user pgis is auto-generated and can be found at /home/pgis/.pgpass
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Security
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=================
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This map loads GeoJson generated from PostGIS directly and does not employ the pg_featurserv or GeoServer urls.
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As you may have noticed, it is identical to our LeafletGeoJson.html map except for the GeoJson source url.
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While urls for pg_featurserv and GeoServer can be secured, the url will always be exposed to your users as it is required for map rendering.
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Conversely, the PostGIS PHP application uses the get-json.php file to establish a connection to PostGIS in the background.
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You can employ the same method for loading GeoJson from pg_featurserv, GeoServer, or any other json url.
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There is performance penalty, however, as the GeoJson is loaded into the end users browser and for large data sets, this can become extremely slow.
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Structure
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=============
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The app is located at::
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/vaw/www/html/LeafletPHPDemo.html
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This is just a basic Leafletjs map in which we are pulling in geojson from get-json.php::
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$.getJSON("get-json.php", function(data) {
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Content
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=========
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The content of the html page is displayed below.
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.. code-block:: console
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:linenos:
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<!doctype html>
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<html>
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<head>
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<style type="text/css">
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body {
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padding: 0;
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margin: 0;
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}
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html, body, #map {
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height: 100%;
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}
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</style>
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<link rel="stylesheet" href="https://unpkg.com/leaflet@1.1.0/dist/leaflet.css"
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integrity="sha512-wcw6ts8Anuw10Mzh9Ytw4pylW8+NAD4ch3lqm9lzAsTxg0GFeJgoAtxuCLREZSC5lUXdVyo/7yfsqFjQ4S+aKw=="
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crossorigin=""/>
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<script src="https://unpkg.com/leaflet@1.1.0/dist/leaflet.js"
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integrity="sha512-mNqn2Wg7tSToJhvHcqfzLMU6J4mkOImSPTxVZAdo+lcPlk+GhZmYgACEe0x35K7YzW1zJ7XyJV/TT1MrdXvMcA=="
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crossorigin=""></script>
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</head>
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<script src="http://code.jquery.com/jquery-2.1.0.min.js"></script>
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</head>
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<body>
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<div id="map"></div>
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<script>
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var osmUrl='http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png';
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var osmAttrib='Data © <a href="http://openstreetmap.org">OpenStreetMap</a> contributors';
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var osm = new L.TileLayer(osmUrl, {minZoom: 2, maxZoom: 8, attribution: osmAttrib});
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$.getJSON("get-json.php", function(data) {
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function onEachFeature(feature, layer) {
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layer.bindPopup("Name: " + feature.properties.name + "<br>" + "Abbreviation: " + feature.properties.abbrev);
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}
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var geojson = L.geoJson(data, {
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onEachFeature: onEachFeature
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});
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var map = L.map('map').fitBounds(geojson.getBounds());
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osm.addTo(map);
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geojson.addTo(map);
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});
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</script>
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</body>
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</html>
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Documentation
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==============
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https://leafletjs.com/
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https://leafletjs.com/examples/geojson/
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