AJAX Live Search

The following example will demonstrate a live search, where you get search results while you type.

Live search has many benefits compared to traditional searching:

Results are shown as you type
Results narrow as you continue typing
If results become too narrow, remove characters to see a broader result

Example Explained – The HTML Page

When a user types a character in the input field above, the function “showResult()” is executed. The function is triggered by the “onkeyup” event:

<html>
 <head>
 <script type="text/javascript">
 function showResult(str)
 {
 if (str.length==0)
   {
   document.getElementById("livesearch").innerHTML="";
   document.getElementById("livesearch").style.border="0px";
   return;
   }
 if (window.XMLHttpRequest)
   {// code for IE7+, Firefox, Chrome, Opera, Safari
   xmlhttp=new XMLHttpRequest();
   }
 else
   {// code for IE6, IE5
   xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
   }
 xmlhttp.onreadystatechange=function()
   {
   if (xmlhttp.readyState==4 && xmlhttp.status==200)
     {
     document.getElementById("livesearch").innerHTML=xmlhttp.responseText;
     document.getElementById("livesearch").style.border="1px solid #A5ACB2";
     }
   }
 xmlhttp.open("GET","livesearch.php?q="+str,true);
 xmlhttp.send();
 }
 </script>
 </head>
 <body>

 <form>
 <input type="text" size="30" onkeyup="showResult(this.value)" />
 <div id="livesearch"></div>
 </form>

 </body>
 </html>

Source code explanation:

If the input field is empty (str.length==0), the function clears the content of the livesearch placeholder and exits the function.

If the input field is not empty, the showResult() function executes the following:

Create an XMLHttpRequest object
Create the function to be executed when the server response is ready
Send the request off to a file on the server
Notice that a parameter (q) is added to the URL (with the content of the input field)

The PHP File

The page on the server called by the JavaScript above is a PHP file called “livesearch.php”.

The source code in “livesearch.php” searches an XML file for titles matching the search string and returns the result:

<?php
 $xmlDoc=new DOMDocument();
 $xmlDoc->load("links.xml");

 $x=$xmlDoc->getElementsByTagName('link');

 //get the q parameter from URL
 $q=$_GET["q"];

 //lookup all links from the xml file if length of q>0
 if (strlen($q)>0)
 {
 $hint="";
 for($i=0; $i<($x->length); $i++)
   {
   $y=$x->item($i)->getElementsByTagName('title');
   $z=$x->item($i)->getElementsByTagName('url');
   if ($y->item(0)->nodeType==1)
     {
     //find a link matching the search text
     if (stristr($y->item(0)->childNodes->item(0)->nodeValue,$q))
       {
       if ($hint=="")
         {
         $hint="<a href='" .
         $z->item(0)->childNodes->item(0)->nodeValue .
         "' target='_blank'>" .
         $y->item(0)->childNodes->item(0)->nodeValue . "</a>";
         }
       else
         {
         $hint=$hint . "<br /><a href='" .
         $z->item(0)->childNodes->item(0)->nodeValue .
         "' target='_blank'>" .
         $y->item(0)->childNodes->item(0)->nodeValue . "</a>";
         }
       }
     }
   }
 }

 // Set output to "no suggestion" if no hint were found
 // or to the correct values
 if ($hint=="")
   {
   $response="no suggestion";
   }
 else
   {
   $response=$hint;
   }

 //output the response
 echo $response;
 ?>

If there is any text sent from the JavaScript (strlen($q) > 0), the following happens:

Load an XML file into a new XML DOM object
Loop through all <title> elements to find matches from the text sent from the JavaScript
Sets the correct url and title in the “$response” variable. If more than one match is found, all matches are added to the variable

If no matches are found, the $response variable is set to “no suggestion”.

Obtain the most well-liked custom wordpress plugin readily available today, you'll find both free and exceptional plugins listed here. We have actually inspected the entire web, examined hundreds of suggested Wordpress plugins and picked the best.

Locate new products the most up to date technology news, including new item launches, revenues figures and tech industry performance details. Check out posts on new gizmos and prototypes for future technology.

seo tips people ought to and need to not be doing on your Websites to make them rate higher in online search engine. In a constantly transforming SEO landscape, it is very important to stay updated with the altering techniques and approaches of optimization.

Right here is a listing of software network management from a central area. There are WordPress control panels, in addition to multisite tools to take care of domains, motifs, campaigns, and a lot more. features one-click gain access to, tracking, data backup, implementation, posting, and safety features. Testimonial which of your websites have styles and plugins that need focus. Along with one click, upgrade all of your plugins, themes or center WordPress software.