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// Clean up the request and make sure it's not longer than four characters $code = trim($_REQUEST['code']); $code = preg_replace("/[^a-z0-9]/i","",$code); $code = strtoupper($code); $code = substr($code,0,4); // Connect to the database require($_SERVER['DOCUMENT_ROOT'] . '/db_credentials.php'); $conn = mysql_connect("localhost", $db_name, $db_pass); mysql_select_db("googlemapsbook", $conn); // Look up the provided code $result = mysql_query("SELECT * FROM uk_postcodes WHERE outcode = '$code'"); if (!$result || mysql_num_rows($result) == 0) die("<Error>No Matches</Error></ResultSet>"); // Output the match that was found $row = mysql_fetch_array($result,MYSQL_ASSOC); echo "<Result> <Latitude>{$row['latitude']}</Latitude> <Longitude>{$row['longitude']}</Longitude> <OutCode>{$row['outcode']}</OutCode> </Result>"; // Close our response echo "</ResultSet>"; > The comments are fairly complete, so we ll elaborate on only the parts that need a bit more explanation. For security, safety, and sanity, the four $code = lines simply take off any whitespace around the edges, strip out characters that are not necessary (like dashes and interior spaces), convert the string to uppercase, and then reduce the length to four characters (the largest outcode in our data set), so we re not making more SQL queries than are needed. Next, we simply query the database looking for an exact match and output the answer if we find one. That s it. After importing the data into a SQL table, it takes a mere 20 lines of code to give you a fairly robust and reliable, XML-returning REST service. A good example of how this sort of data can be used in a mapping application is the Virgin Radio VIP club members map found at http://www.virginradio.co.uk/vip/map.html. It shows circles of varying sizes based on the number of members in a given outcode. Other uses might include calculating rough distances between two people or grouping people, places, or things by region.

In Flex, ActionScript classes correspond to MXML tags. When you create a Flex application, the application interrogates the MXML tags to generate the appropriate ActionScript classes. These tags help to shape and structure the different Flex components that are used within an application. The structure may define the height and width of a component or container, as well as all attributes that the specified ActionScript class has defined. Listing 4-4 shows an example of using MXML tags. Listing 4-4. Flex MXML Tag Example < xml version="1.0" > <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:local="*"> <mx:Panel id="mainPnl" title="MXML Tags" height="200" width="200" paddingLeft="10" paddingRight="10" paddingBottom="10" paddingTop="10" horizontalAlign="center"> <mx:RadioButton id="rb" label="On" /> <mx:Button id="submitBtn" label="Do It" /> </mx:Panel> </mx:Application>

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If you would prefer to allow people to match on partial strings, you ll need to be a bit more creative Something like the following code snippet could replace your single lookup in Listing 11-4 and allow you to be more flexible with your user s query // Look up the provided code $result = mysql_query("SELECT * FROM uk_postcodes WHERE outcode LIKE '$code%'"); while (strlen($code) > 0 && mysql_num_rows($result) == 0) { // That code was not found.

Changing Forms with form_alter()

Namespaces in MXML are used to locate components and containers for you to use in your applications. They act as an alias to the location of the core components that come with Flex Builder, or a series of custom components you have defined yourself. The default namespace in Flex is xmlns:mx="http://www.adobe.com/2006/mxml". You will notice the alias mx is the namespace object to access all components in the mx object, thus: <mx:Button id="btnNamespace" /> <mx:VBox id="vbxNamespace" /> To define a custom namespace, we need to create a new folder. Let s call the folder views. In the views folder, create a new MXML component called NamespaceTest.mxml. We fill out the NamespaceTest.mxml component as shown in Listing 4-5, and add it to a new Flex application as shown in Listing 4-6.

Trim one character off the end and try again $modified_request = true; $code = substr($code,0,strlen($code)-1); $result = mysql_query("SELECT * FROM uk_postcodes WHERE outcode = '$code'"); } // If the $code has been completely eaten, then there are no matches at all if (strlen($code) == 0) die("<Error>No Matches</Error></ResultSet>"); // Output the match(es) found while($row = mysql_fetch_array($result,MYSQL_ASSOC)) { echo "<Result> <Latitude>{$row['latitude']}</Latitude> <Longitude>{$row['longitude']}</Longitude> <OutCode>{$row['outcode']}</OutCode> </Result>"; } Basically, you query the database table with a wildcard at the end of the requested code This will allow you to return all results that match the prefix given For example, if someone requests $code=AB1, there are seven matches in the database, but if their exact request yields no results, then our sample code strips one character off the end and tries again Only if the length of the request code is zero do we give up and return an error.

Listing 4-5. NamespaceTest.mxml Component < xml version="1.0" encoding="utf-8" > <mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml" width="400" height="300"> <mx:Panel title="Namespace Example" paddingLeft="10" paddingRight="10" paddingBottom="10" paddingTop="10" horizontalAlign="center"> mx:Button label="Do It"/> </mx:Panel> </mx:Canvas> Listing 4-6. Main Application for the NamespaceTest.mxml Component < xml version="1.0" > <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:view="view.*" horizontalAlign="center" verticalAlign="middle"> <view:NamespaceTest width="100%" height="100%" /> </mx:Application> If you are using Flex Builder, you should notice that the new namespace is in the code completion menu when you start typing <Namespa.... Selecting your new component will add the view namespace to the <mx:Application> beginning MXML tag automatically. You now have access to any component you put in the view folder through the namespace alias. This is a key point, as you will be using namespaces consistently as you progress to larger applications.

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