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CHAPTER 3 PHP AND AJAX
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< php //validator.php //A list of valid names. //Again, this would usually come from a database. $names = array ("Lee Babin","Joe Smith","John Doe"); if (!in_array (strtolower ($_GET['sstring']), strtolower ($names))){ //Then return with an error. ><span style="color: #FF0000;">Name not found...</span>< php } else { //At this point we would go to the processing script. ><span style="color: #FF0000;">Form would now submit...</span>< php } >
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All the PHP script does is check for a valid match from the passed-in Your Name field. If a match is found, the script would merely submit the form using JavaScript (in this case, it merely displays a message I will discuss more on submitting a form using JavaScript later in this book). If an error is found, you can output the error seamlessly and rather quickly. The nice thing about this little bit of functionality is that your form stays populated (since the form has not been submitted yet). This saves you a lot of time from a coding perspective and makes things seamless and intuitive for the user (see Figure 3-3).
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Figure 3-3. As you can see, names that are not supposed to be entered can be validated against.
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CHAPTER 3 PHP AND AJAX
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Tool Tips
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One of the more common DHTML tricks you will see on the Internet is the tool tip. This is basically a little box filled with information that will appear above a properly placed cursor. While this is all fine and dandy, the information contained within said box in non-Ajax enabled web sites is usually either hard-coded in or potentially loaded through some serverside trickery. What you will do in the next example is load the box dynamically using Ajax. As a useful addition to your calendar application, it would be nice to dynamically display a box with all currently assigned tasks when a user hovers over a certain date. The PHP script would henceforth have to scour the database and return any instances of tasks associated with said day. Since I m not going to get into databases just yet, I ll have you build the script to accommodate an array of tasks for now, just to showcase the tool tip functionality. First off, let s have a look at the calendar.php file in order to view the changes to the calendar code:
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//Let's make an appropriate number of rows... for ($k = 1; $k <= $numrows; $k++){ ><tr>< php //Use 7 columns (for 7 days)... for ($i = 0; $i < 7; $i++){ $startdate++; if (($startdate <= 0) || ($startdate > $lastday)){ //If we have a blank day in the calendar. ><td style="background: #FFFFFF;"> </td>< php } else { if ($startdate == date("j") && $month == date("n") && $year == date("Y")){ <td onclick="createform(event)" class="calendartodayoff" onmouseover="this.className='calendartodayover'; checkfortasks ('< php echo $year . "-" . $month . "-" . $startdate; >',event);" onmouseout="this.className='calendartodayoff'; hidetask();"> < php echo date ("j"); ></td>< php } else { <td onclick="createform(event)" class="calendaroff" onmouseover="this.className='calendarover'; checkfortasks ('< php echo $year . "-" . $month . "-" . $startdate; >',event);" onmouseout="this.className='calendaroff'; hidetask();"> < php echo $startdate; ></td>< php } } } ></tr>< php }
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CHAPTER 3 PHP AND AJAX
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The major change made here is calling a checkfortasks function that is fired by the onmouseover event, and a hidetask function that fires on the onmouseout event. Basically, the current date that a user is hovering over will be passed to the appropriate functions, which are located within the functions.js file (shown following):
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//functions.js function checkfortasks (thedate, e){ theObject = document.getElementById("taskbox"); theObject.style.visibility = "visible"; var posx = 0; var posy = 0; posx = e.clientX + document.body.scrollLeft; posy = e.clientY + document.body.scrollTop; theObject.style.left = posx + "px"; theObject.style.top = posy + "px"; serverPage = "taskchecker.php thedate=" + thedate; objID = "taskbox"; var obj = document.getElementById(objID); xmlhttp.open("GET", serverPage); xmlhttp.onreadystatechange = function() { if (xmlhttp.readyState == 4 && xmlhttp.status == 200) { obj.innerHTML = xmlhttp.responseText; } } xmlhttp.send(null); } function hidetask (){ tObject = document.getElementById("taskbox"); tObject.style.visibility = "hidden"; tObject.style.height = "0px"; tObject.style.width = "0px"; }
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