New PDF release: Beginning Google Maps Applications with Rails and Ajax: From

By Andre Lewis, Cameron Turner, Jeffrey Sambells, Michael Purvis

ISBN-10: 1590597877

ISBN-13: 9781590597873

The Google Maps API continues to be one of many show off examples of the net 2.0 improvement paradigm. starting Google Maps functions with Rails and Ajax: From amateur to specialist is the 1st publication to comprehensively introduce the carrier from a developer viewpoint, displaying you the way you could combine mapping positive factors into your Rails-driven net applications.Proceeding a long way past simplistic map demonstrate, you are going to how to draw from quite a few info assets resembling the U.S. Census Bureau's TIGER/Line info and Google's personal geocoding function to construct entire geocoding prone for mapping many destinations round the world.The e-book additionally steers you thru a number of examples that exhibit how one can motivate consumer interplay similar to via pinpointing map destinations, including reviews, and construction community-driven maps. you need to decide up a duplicate of this booklet simply because * this is often the 1st ebook to comprehensively introduce the Google Maps software improvement utilizing the Rails improvement framework. * you will be brought to the very most recent alterations to the Google Maps API, embodied within the model 2 free up. * it really is written through 4 builders actively concerned with the production of location-based mapping companies.

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Extra resources for Beginning Google Maps Applications with Rails and Ajax: From Novice to Professional

Example text

Figure 3-5). Figure 3-5. qxd 44 2/2/07 9:35 AM Page 44 CHAPTER 3 ■ INTERACTING WITH THE USER AND THE SERVER Embedding a Form into the Info Window When geocachers want to create a new marker, you’ll first prompt them to enter some information about their treasure. You’ll want to know the geocache’s location (this will be determined using the point where they clicked the map), what they found at the location, and what they left behind. To accomplish this in your form, you’ll need the following: • A text field for entering information about what they found • A text field for entering information about what they left behind • A hidden field for the longitude • A hidden field for the latitude • A Submit button The HTML form used for the example is shown in Listing 3-3, but as you can see in Listing 3-4, you are going to use the JavaScript DOM object and methods to create the form element.

Firefox and Safari both seem to struggle with this, but the worst culprit is Internet Explorer. Even up to version 6, simply closing a web page is not enough to free all the memory associated with its JavaScript objects. An extended period of surfing JavaScript-heavy sites such as Google Maps could slowly consume all system memory until Internet Explorer is manually closed and restarted. Fortunately, JavaScript objects can be manually destroyed by setting them equal to null. The Google Maps API now has a special function that will destroy most of the API’s objects, which helps keep browsers happy.

BID=194). addListener() method to react to clicks by the users, so that people who visit the map can mark their finds on the map. • Ask users for additional information about their finds using an info window and an embedded HTML form. • Create a MySQL table to store information about the points on the map. • Save the latitude, longitude, and additional information in an HTML form to your server using the GXmlHttp Asynchronous JavaScript and XML (Ajax) object on the client side and a Rails action on the server.

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Beginning Google Maps Applications with Rails and Ajax: From Novice to Professional by Andre Lewis, Cameron Turner, Jeffrey Sambells, Michael Purvis


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