# GeoExt

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# GeoExt QuickStart

Welcome to GeoExt! This document is intended to help you get started with GeoExt. With GeoExt, you can start from nothing and have a rich mapping application in seconds.

## Getting GeoExt

GeoExt is built on top of the robust OpenLayers JavaScript mapping library and the rich graphical components of ExtJS. For licensing reasons, ExtJS cannot be included in the GeoExt download, so preparing GeoExt for use on your own web pages is a multi-step process:

1. Download GeoExt from the downloads page. For the purposes of this quickstart, the development version will be fine.
2. Download OpenLayers 2.10 or later from http://openlayers.org/.
3. Download the latest Ext 3.x from the ExtJS website.
4. Place both unpacked libraries in a directory that is published by your web server. For this tutorial, I will assume that this is the root of your web server, so that GeoExt.js is at http://localhost/GeoExt/lib/GeoExt.js and ext-all.js is at http://localhost/ext-3.3.1/ext-all.js. I will also assume that your web page is stored at the root of the web server, e.g. http://localhost/quickstart.html.
5. Now you’re ready to use GeoExt in your application!

Note

For production environments, the GeoExt team recommends that you use compressed and minified builds of GeoExt and ExtJS to optimize the download size of your page. A generic minified build containing all of GeoExt is available from the downloads page, but advanced users can build their own.

## Basic Example

Let’s build a simple web page that just embeds a map with interactive navigation.

1. Include the ExtJS libraries in your web page.

       <script src="ext-3.3.1/adapter/ext/ext-base.js" type="text/javascript"></script>
       <script src="ext-3.3.1/ext-all.js"  type="text/javascript"></script>
       <link rel="stylesheet" type="text/css" href="ext-3.3.1/resources/css/ext-all.css"></link>
       <script src="OpenLayers/OpenLayers.js" type="text/javascript"></script>
       <script src="GeoExt/lib/GeoExt.js" type="text/javascript"></script>
       <link rel="stylesheet" type="text/css" href="GeoExt/resources/css/geoext-all-debug.css"></link>

2. Create a `<div>` element in your web page with its `id` attribute set to `gxmap`. We will use the `id` to attach a GeoExt component to the `div`.

3. Attach a `MapPanel` object to the `div` with some JavaScript code:

       <script type="text/javascript">
           Ext.onReady(function() {
               var map = new OpenLayers.Map();
               var layer = new OpenLayers.Layer.WMS(
                   "Global Imagery",
                   "http://maps.opengeo.org/geowebcache/service/wms",
                   {layers: "bluemarble"}
               );
               map.addLayer(layer);

               new GeoExt.MapPanel({
                   renderTo: 'gxmap',
                   height: 400,
                   width: 600,
                   map: map,
                   title: 'A Simple GeoExt Map'
               });
           });
       </script>

The entire source of your page should look something like:

    <html>
    <head>

    <title> A Basic GeoExt Page </title>
    <script src="ext-3.3.1/adapter/ext/ext-base.js" type="text/javascript"></script>
    <script src="ext-3.3.1/ext-all.js"  type="text/javascript"></script>
    <link rel="stylesheet" type="text/css" href="ext-3.3.1/resources/css/ext-all.css"></link>
    <script src="OpenLayers/OpenLayers.js" type="text/javascript"></script>
    <script src="GeoExt/lib/GeoExt.js" type="text/javascript"></script>
    <link rel="stylesheet" type="text/css" href="GeoExt/resources/geoext-all-debug.css"></link>

    <script type="text/javascript">
        Ext.onReady(function() {
            var map = new OpenLayers.Map();
            var layer = new OpenLayers.Layer.WMS(
                "Global Imagery",
                "http://maps.opengeo.org/geowebcache/service/wms",
                {layers: "bluemarble"}
            );
            map.addLayer(layer);

            new GeoExt.MapPanel({
                renderTo: 'gxmap',
                height: 400,
                width: 600,
                map: map,
                title: 'A Simple GeoExt Map'
            });
        });
    </script>
    </head>
    <body>
    <div id="gxmap"></div>
    </body>
    </html>

And that’s it! You now have all of GeoExt, ready to bring your geospatial data to life. Go forth and prosper!

## Going Further

From here, there are a wide variety of options available for making customized, highly interactive mapping applications with GeoExt. To learn more take a look at Tutorials, examples and API Reference.

We also recommend reading Primer: Ext and Primer: OpenLayers to become acquainted with the libraries that form the foundation of GeoExt.

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