I am trying to create a page that shows google map and allows users to draw lines on the map and save them.. but when I try to run the page, the map doesn't show up at all. What am I doing wrong? the page is literally blank with the form at the end.
I was having a look online for a solution.. I found this code and modified it with my api key
<!DOCTYPE html>
<html>
<head>
<title>Draw </title>
<script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<style>
html,
body,
#map-canvas {
height: 90%;
margin: 0px;
padding: 0px
}
</style>
<script type="text/javascript">
var map; // Global declaration of the map
var iw = new google.maps.InfoWindow(); // Global declaration of the infowindow
var lat_longs = new Array();
var markers = new Array();
var drawingManager;
function initialize() {
var myLatlng = new google.maps.LatLng(40.9403762, -74.1318096);
var myOptions = {
zoom: 13,
center: myLatlng,
mapTypeId: google.maps.MapTypeId.ROADMAP}
map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
drawingManager = new google.maps.drawing.DrawingManager({
drawingMode: google.maps.drawing.OverlayType.POLYGON,
drawingControl: true,
drawingControlOptions: {
position: google.maps.ControlPosition.TOP_CENTER,
drawingModes: [google.maps.drawing.OverlayType.POLYGON]
},
polygonOptions: {
editable: true
}
});
drawingManager.setMap(map);
google.maps.event.addListener(drawingManager, "overlaycomplete", function(event) {
var newShape = event.overlay;
newShape.type = event.type;
});
google.maps.event.addListener(drawingManager, "overlaycomplete", function(event){
overlayClickListener(event.overlay);
$('#vertices').val(event.overlay.getPath().getArray());
});
}
function overlayClickListener(overlay) {
google.maps.event.addListener(overlay, "mouseup", function(event){
$('#vertices').val(overlay.getPath().getArray());
});
}
initialize();
$(function(){
$('#save').click(function(){
//iterate polygon vertices?
});
});
</script>
<script src="https://maps.googleapis.com/maps/api/js?key=[my api key]&libraries=drawing"></script>
<div id="map_canvas" style="width:500px; height:450px;"></div>
<form method="post" accept-charset="utf-8" id="map_form">
<input type="text" name="vertices" value="" id="vertices" />
<input type="button" name="save" value="Save!" id="save" />
</form>
</body>
</html>
CodePudding user response:
- your HTML is invalid (no end tag for head, no start tag for body).
- when you are loading the API synchronously, you need to include it before you use it.
- when you are loading the API synchronously, you need to move the javascript after the DOM
code snippet:
<!DOCTYPE html>
<html>
<head>
<title>Draw </title>
<script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<style>
html,
body,
#map-canvas {
height: 90%;
margin: 0px;
padding: 0px
}
</style>
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&libraries=drawing"></script>
</head>
<body>
<div id="map_canvas" style="width:500px; height:450px;"></div>
<form method="post" accept-charset="utf-8" id="map_form">
<input type="text" name="vertices" value="" id="vertices" />
<input type="button" name="save" value="Save!" id="save" />
</form>
<script type="text/javascript">
var map; // Global declaration of the map
var iw = new google.maps.InfoWindow(); // Global declaration of the infowindow
var lat_longs = new Array();
var markers = new Array();
var drawingManager;
function initialize() {
var myLatlng = new google.maps.LatLng(40.9403762, -74.1318096);
var myOptions = {
zoom: 13,
center: myLatlng,
mapTypeId: google.maps.MapTypeId.ROADMAP}
map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
drawingManager = new google.maps.drawing.DrawingManager({
drawingMode: google.maps.drawing.OverlayType.POLYGON,
drawingControl: true,
drawingControlOptions: {
position: google.maps.ControlPosition.TOP_CENTER,
drawingModes: [google.maps.drawing.OverlayType.POLYGON]
},
polygonOptions: {
editable: true
}
});
drawingManager.setMap(map);
google.maps.event.addListener(drawingManager, "overlaycomplete", function(event) {
var newShape = event.overlay;
newShape.type = event.type;
});
google.maps.event.addListener(drawingManager, "overlaycomplete", function(event){
overlayClickListener(event.overlay);
$('#vertices').val(event.overlay.getPath().getArray());
});
}
function overlayClickListener(overlay) {
google.maps.event.addListener(overlay, "mouseup", function(event){
$('#vertices').val(overlay.getPath().getArray());
});
}
initialize();
$(function(){
$('#save').click(function(){
//iterate polygon vertices?
});
});
</script>
</body>
</html>
<iframe name="sif1" sandbox="allow-forms allow-modals allow-scripts" frameborder="0"></iframe>