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POclear polygons with setMap(null) before updating with new geojson
 

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  1. POclear polygons with setMap(null) before updating with new geojson
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    <p>I'm trying to clear all my polygon objects before I import new geoJSON data and create new objects. I can't seem to get the setMap(null) function to work correctly. Hopefully someone can kindly let me know where I am failing.</p> <p>Thank you</p> <pre><code>var map; function removeAllMarkers(){// removes all markers from map //console.log(data); for( var i = 0; i &lt; data.length; i++ ){ delpolygon = new google.maps.Poly({ position: data[i] }) delpoly.setMap(null) } data.length = 0; //markersInfoArray.length = 0; }; // ajax request to load json data var data; function pullNewData () { var newRequest = new XMLHttpRequest(); newRequest.open('GET', 'json_template.json', true); newRequest.onload = function() { //data = eval("(" + xhr.responseText + ")") data = JSON.parse(newRequest.responseText) console.log(data); sector_callback(data); removeAllMarkers(data); }; newRequest.send(); }; //setInterval(pullNewData,5000); // function to load map into body when page loads function initialize() { var kansas_city = new google.maps.LatLng(39.316858,-94.963194); var mapOptions = { zoom: 13, center: kansas_city, mapTypeId: google.maps.MapTypeId.TERRAIN }; map = new google.maps.Map(document.getElementById('map_canvas'), mapOptions); } // ajax request to load json data var data; var xhr = new XMLHttpRequest(); xhr.open('GET', 'json_template.json', true); xhr.onload = function() { //data = eval("(" + xhr.responseText + ")") data = JSON.parse(xhr.responseText) //console.log(data); sector_callback(data); }; xhr.send(); function createClickablePoly(poly, html) { google.maps.event.addListener(poly, 'click', function(evt) { infowindow.setContent(html); infowindow.setPosition(evt.latLng); infowindow.open(map); }); } var infowindow = new google.maps.InfoWindow({}); var allPolygons = []; function sector_callback() { var bounds = new google.maps.LatLngBounds(); for (var i = 0, len = data.features.length; i &lt; len; i++) { var coords = data.features[i].geometry.coordinates[0]; siteNames = data.features[i].properties.Name; // added for site names var path = []; //console.log(siteNames); //console.log(coords); for ( var j = 0, len2 = coords.length; j &lt; len2; j++ ){ // pull out each set of coords and create a map object var pt = new google.maps.LatLng(coords[j][1], coords[j][0]) bounds.extend(pt); path.push(pt); //path.push(new google.maps.LatLng(coords[j][1], coords[j][0])); } var polygons = new google.maps.Polygon({ path: path, strokeColor: "#000000", strokeOpacity: 0.8, strokeWeight: 1, fillColor: "#000000", fillOpacity: 0.35, map: map }); createClickablePoly(polygons, siteNames); google.maps.event.addListener(polygons, 'mouseover', function() { var currentPolygon = this; currentPolygon.setOptions({ // setOptions is a method and properties below fillOpacity: 0.45, fillColor: "#FF0000" }) }); google.maps.event.addListener(polygons, 'mouseout', function() { var currentPolygon = this; currentPolygon.setOptions({ fillOpacity: 0.35, fillColor: "#000000" }) }); allPolygons.push(polygons); } } console.log(allPolygons); </code></pre>
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