AJAX real-time search

PHP Example-AJAX Real-time Search

Example Explanation-HTML Page

When the user is in When characters are typed in the input box above, the "showResult()" function will be executed. This function is triggered by the "onkeyup" event:

<html>
 <head>
     <script>
         function showResult(str)
         {
             if (str.length==0)
             {
                 document.getElementById("livesearch").innerHTML="";
                 document.getElementById("livesearch").style.border="0px";
                 return;
             }
             if (window.XMLHttpRequest)
             {// IE7+, Firefox, Chrome, Opera, Safari 浏览器执行
                 xmlhttp=new XMLHttpRequest();
             }
             else
             {// IE6, IE5 浏览器执行
                 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 box is empty (str.length==0), this function will Clear the contents of the livesearch placeholder and exit the function.

If the input box is not empty, then showResult() will perform the following steps:

· Create an XMLHttpRequest object

· Create a function to be executed when the server response is ready

# ·

PHP file

The server page called through JavaScript above is a PHP file named "livesearch.php".

The source code in "livesearch.php" searches the XML file for titles that match the search string and returns the results:

<?php
$xmlDoc=new DOMDocument();
$xmlDoc->load("links.xml");
 
$x=$xmlDoc->getElementsByTagName('link');
 
// 从 URL 中获取参数 q 的值
$q=$_GET["q"];
 
// 如果 q 参数存在则从 xml 文件中查找数据
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)
               {
                       // 找到匹配搜索的链接
                       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>";
                               }
                       }
               }
        }
}
 
// 如果没找到则返回 "no suggestion"
if ($hint=="")
{
        $response="no suggestion";
}
else
{
        $response=$hint;
}
 
// 输出结果
echo $response;
?>

If JavaScript sends any text (i.e. strlen($q ) > 0), what will happen:

· Load the XML file into a new XML DOM object

· using using using using using using using ‐ ‐ ‐ ‐ ‐ - to find the text that matches the text passed by JavaScript

· Set 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 match is found, set the $response variable to "no suggestion".

Continuing Learning

new file

<html> <head> <script> function showResult(str) { if (str.length==0) { document.getElementById("livesearch").innerHTML=""; document.getElementById("livesearch").style.border="0px"; return; } if (window.XMLHttpRequest) {// IE7+, Firefox, Chrome, Opera, Safari 浏览器执行 xmlhttp=new XMLHttpRequest(); } else {// IE6, IE5 浏览器执行 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>

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AJAX real-time search

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