Download PDF by Andre Lewis, Cameron Turner, Jeffrey Sambells, Michael: 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 exhibit examples of the internet 2.0 improvement paradigm. starting Google Maps functions with Rails and Ajax: From amateur to specialist is the 1st booklet to comprehensively introduce the provider from a developer point of view, exhibiting you ways you could combine mapping good points into your Rails-driven internet applications.Proceeding a long way past simplistic map reveal, you are going to draw from numerous information resources similar to the U.S. Census Bureau's TIGER/Line facts and Google's personal geocoding function to construct entire geocoding companies for mapping many destinations round the world.The ebook additionally steers you thru numerous examples that convey find out how to motivate consumer interplay similar to via pinpointing map destinations, including reviews, and development community-driven maps. you might want to decide up a duplicate of this ebook simply because * this can be the 1st ebook to comprehensively introduce the Google Maps software improvement utilizing the Rails improvement framework. * you may be brought to the very most up-to-date adjustments to the Google Maps API, embodied within the model 2 free up. * it's written by way of 4 builders actively fascinated about the production of location-based mapping providers.

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Listing 2-3. onload = init; Although the behavior is almost identical, the JavaScript code in Listing 2-3 has two important changes: • The starting center point for latitude, longitude, and start zoom level of the map are stored in var variables at the top of the script, so it will be more straightforward to change the initial center point the next time. You won’t need to hunt down a setCenter() call that’s buried somewhere within the code. js file. onload event. Once the page has loaded, this function will be called and the map will be initialized.

The Google Maps API is 100% JavaScript, and you need to get familiar with JavaScript to fully leverage all the API’s mapping goodness. Likewise, there are some Google Maps-related plug-ins listed on RubyForge, which will provide Google Maps-specific helpers. org/ projects/ym4r/). Cartographer has been around longer (according to RubyForge), but YM4R is more mature and full-featured. YM4R also seems to be more up-to-date and actively maintained. YM4R provides an attractive way to begin working with Google Maps on Rails with minimal upfront JavaScript programming.

For this example, the latitude and longitude is not important, so feel free to change it to some other location if you wish. Figure 3-2. Starting map with controls centered on Palo Alto, California Listening to User Events The purpose of your map is to allow visitors to add markers wherever they click. To capture the clicks on the map, you’ll need to trigger a JavaScript function to execute whenever the map area is clicked. addListener() method. qxd 40 2/2/07 9:35 AM Page 40 CHAPTER 3 ■ INTERACTING WITH THE USER AND THE SERVER can add event listeners for a variety of events, including move and click, but in this case, you are interested only in users clicking on the map, not moving it or dragging it around.

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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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