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
Search for a W3Schools page in the input field below:
The results in the example above are found in an XML file (links.xml). To make this example small and simple, only six results are available.
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:
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="" . $y->item(0)->childNodes->item(0)->nodeValue . ""; } else { $hint=$hint . "
" . $y->item(0)->childNodes->item(0)->nodeValue . ""; } } } } } // Set output to "no suggestion" if no hint were found // or to the correct values if ($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 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"
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="" . $y->item(0)->childNodes->item(0)->nodeValue . ""; } else { $hint=$hint . "
" . $y->item(0)->childNodes->item(0)->nodeValue . ""; } } } } } // Set output to "no suggestion" if no hint were found // or to the correct values if ($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 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"
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