I'm just starting to learn javascript API and copy/pasted some very simple code to test and run. On click of the button the map suppose to zoom in but after a second or 2 it just zooms back to it's initial extent. What have I done wrong? Please help! Thanks in advance.
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no"/>
<title>Simple Map</title>
<link rel="stylesheet" href="https://js.arcgis.com/3.16/esri/css/esri.css">
<style>
html, body, #map {
height: 100%;
margin: 0;
padding: 0;
}
</style>
<script src="https://js.arcgis.com/3.16/"></script>
<script>
var map;
require(["esri/map", "dojo/domReady!"], function (Map) {
map = new Map("map", {
basemap: "topo", //For full list of pre-defined basemaps, navigate to http://arcg.is/1JVo6Wd
center: [-122.45, 37.75], // longitude, latitude
zoom: 13
});
});
function zoomIn() {
var extent = map.extent;
map.setExtent(extent.expand(0.5));
}
</script>
</head>
<body>
<form runat="server">
<div id="map"></div>
<div>
<asp:Button runat="server" ID="zoomIn" Text="Zoom to extent" OnClientClick="zoomIn();" />
</div>
</form>
</body>
</html>
after setting onsubmit="return false" the setExtent only works the first time the button is clicked then nothing after that. Any idea why and how to fix it?