Learn
/
ResetFieldDB.html

<!DOCTYPE html>
<html>
<head>
	<title>Learning Geospatial Analysis with Python 2nd Ed. Field Data Collection Example "Database" Reset</title>

	<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">

	<style>
		body {
			padding: 0;
			margin: 0;
			background-color: #000000;
			color: #FFFFFF;
			font-family: Verdana, Arial, Sans-serif;
		}
		html, body, #map {
			height: 80%;
		}
		h1, h2, h3, h4{
			color: #FFFFFF;
			font-family: Verdana, Arial, Sans-serif;
		}
		#info {
			background-color: #FFFF00;
			color: #FF0000;
			font-family: Verdana, Arial, Sans-serif;
		}
	</style>
</head>
<body onload="retrieveData()">
	<div>
	<h3>Field Data Collection Example "Database" Reset</h3>
	<font color="#009933">Learning Geospatial Analysis with Python 2nd Ed.</font>
	<p>
	This page resets the simple MyJSON.com storage for this cookbook example to a single geojson feature to fix the inevitable
	<a href="http://www.joelonsoftware.com/articles/fog0000000319.html">Shlemiel problem</a> with this simple design.  This approach
	keeps this example as simple and understandable as possible.</p>
	</div>
	<div id="form">
	<form id="dbReset">
	<input type="button" value="RESET" onclick="sendData()"><br/>
	</form>
	<b>Current stored geojson contents:</b><br/>
	</div>
	<div id="currentDb">
	</div>

	<script>
var myJsonUrl = 'https://api.myjson.com/bins/467pm';
var database = '';
info = '';

function retrieveData() {
    var xhr = new XMLHttpRequest();
    xhr.open("GET", myJsonUrl + "?pretty=1", false);
    xhr.send(null);
    data = xhr.responseText;
    info = document.getElementById("currentDb");
    info.innerHTML = "<pre>" + data + "</pre>";
}

function sendData() {
    frm_name = document.getElementById("name");
    frm_date = document.getElementById("date");
    frm_comment = document.getElementById("comment");
    observation = {"type": "FeatureCollection",
      "crs": { "type": "name",
      "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } },
      "features": [
      { "type": "Feature",
      "properties": { "popupContent": "NAME: Joel Lawhead<br> DATE: 2015-11-2<br> COMMENT: No ice found."},
      "geometry": { "type": "Point",
      "coordinates": [ -101.467289719626166, 39.596844824675088 ] } }
      ]};
    var xhr = new XMLHttpRequest();
    xhr.open("PUT", myJsonUrl, true);
    xhr.setRequestHeader('Content-Type', 'application/json; charset=UTF-8');
    // update the collected data as JSON
    obs = JSON.stringify(observation);
    xhr.send(obs);
    info.innerHTML = "<pre>" + obs + "</pre>";
}
	</script>
</body>
</html>