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CHAPTER 4 DATABASE-DRIVEN AJAX
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} catch (e) { //If not, then use the older active x object. try { //If we are using IE. xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); } catch (E) { //Else we must be using a non-IE browser. xmlhttp = false; } } //If we are using a non-IE browser, create a javascript instance of the object. if (!xmlhttp && typeof XMLHttpRequest != 'undefined') { xmlhttp = new XMLHttpRequest(); } //Function to run a word grabber script. function grabword (theelement){ //If there is nothing in the box, run Ajax to populate it. if (document.getElementById(theelement).innerHTML.length == 0){ //Change the background color. document.getElementById(theelement).style.background = "#CCCCCC"; serverPage = "wordgrabber.php"; var obj = document.getElementById(theelement); xmlhttp.open("POST", serverPage); xmlhttp.onreadystatechange = function() { if (xmlhttp.readyState == 4 && xmlhttp.status == 200) { obj.innerHTML = xmlhttp.responseText; } } xmlhttp.send(null); } else { //Change the background color. document.getElementById(theelement).style.background = "#FFFFFF"; //If the box is already populated, clear it. document.getElementById(theelement).innerHTML = ""; } }
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CHAPTER 4 DATABASE-DRIVEN AJAX
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You first create an XMLHttpRequest object and then check to see if the box already has content. If the box is already filled with content, the grabword function merely sets the innerHTML property of the object to blank. If it is empty, however, the function makes an Ajax request to populate the box with the results of the output from the wordgrabber.php file. Let s have a look at the wordgrabber.php file to see how the query is executed:
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< php //wordgrabber.php //Require in the database connection. require_once ("dbconnector.php"); //Open the database. $db = opendatabase(); //Then perform a query to grab a random word from our database. $querystr = "SELECT content FROM block ORDER BY RAND() LIMIT 1"; if ($myquery = mysql_query ($querystr)){ $mydata = mysql_fetch_array ($myquery); echo $mydata['content']; } else { echo mysql_error(); } >
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The PHP script first requires the database connection script built in the previous code block (dbconnector.php), and then calls the opendatabase function to allow a valid connection to the database. From there, you simply build a SQL query to grab the content of a random word from your block table. Last, the content is outputted; Figure 4-3 shows the effects of clicking and unclicking the different boxes.
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CHAPTER 4 DATABASE-DRIVEN AJAX
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Figure 4-3. Clicking the individual boxes results in random words being put in through Ajax-controlled PHP database access.
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While working with Ajax-based MySQL connectivity, there are several aspects to keep in mind. First off, it is worth noting that making connections to databases through Ajaxbased interfaces can quickly become a processing nightmare for the database server if you are not careful about it. When you consider that you could have multiple processes going on in the same page for the same user, the possibility for multiple connections bogging down the server increases dramatically. Consider a web page that has three spots on a single page through which the database can be accessed with Ajax. This would mean that a single page could generate three open requests per user, whenever the functionality was processed. If you think of that across a busy site, the possibility for database server overload becomes higher. As more advanced connection handling becomes available to keep up with the rise in Ajax functionality, this should become less of an issue, but it is important to note anyway so that you don t potentially go overboard without realizing the possible problems involved. Next, you have to consider the ergonomics of what you re loading a MySQL result into. For instance, if you re working with a full page refresh and you want to output an error message, it would be simple to load the error message somewhere into the page where it might be quite visible. However, when working with Ajax, you will frequently be loading content into smaller, more contained, less evident enclosures. Therefore, you will have to be more vigilant in keeping the user s attention on what is going on. In particular, MySQL errors can be quite large, and so it might be a better idea to have any MySQL errors e-mailed to an administrator, and have a small warning message outputted to the user.
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