PHP-Ajax XML解析器

Ajax XML示例

与Ajax一起使用，我们可以解析本地目录和服务器中的xml，下面的示例演示如何使用Web浏览器解析xml。

<script>
         function showCD(str) {
            if (str == "") {
               document.getElementById("txtHint").innerHTML = "";
               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("txtHint").innerHTML = xmlhttp.responseText;
               }
            }
            xmlhttp.open("GET","getcourse.php?q="+str,true);
            xmlhttp.send();
         }
      </script>
   
   
   
      
      <form>
         Select a Course:
         <select name="cds" onchange="showCD(this.value)">
            <option value="">Select a course:</option>
            <option value="Android">Android </option>
            <option value="Html">HTML</option>
            <option value="Java">Java</option>
            <option value="Microsoft">MS technologies</option>
         </select>
      </form>
      
      <div id="txtHint"><b>Course info will be listed here...</b></div>
      
   

上面的示例将使用GET方法调用getcourse.php。 getcourse.php文件加载catalog.xml。 getcourse.php如下所示-

<?php $q = $_GET["q"];
   
   $xmlDoc = new DOMDocument();
   $xmlDoc-?>load("catalog.xml");
   
   $x = $xmlDoc->getElementsByTagName('COURSE');
   
   for ($i = 0; $i<=$x->length-1; $i++) {
      =
      if ($x->item($i)->nodeType == 1) {
         if ($x->item($i)->childNodes->item(0)->nodeValue == $q) {
            $y = ($x->item($i)->parentNode);
         }
      }
   }
    
   $cd = ($y->childNodes);
   
   for ($i = 0;$ilength;$i++) {
      if ($cd->item($i)->nodeType == 1) {
         echo("<b>" . $cd->item($i)->nodeName . ":</b> ");
         echo($cd->item($i)->childNodes->item(0)->nodeValue);
         echo("<br>");
      }
   }
?>

Catalog.xml

具有课程列表和详细信息的XML文件。此文件可通过getcourse.php访问

<catalog>
   <subject>
      <course>Android</course>
      <country>India</country>
      <company>TutorialsPoint</company>
      <price>$10</price>
      <year>2015</year>
   </subject>
   
   <subject>
      <course>Html</course>
      <country>India</country>
      <company>TutorialsPoint</company>
      <price>$15</price>
      <year>2015</year>
   </subject>
   
   <subject>
      <course>Java</course>
      <country>India</country>
      <company>TutorialsPoint</company>
      <price>$20</price>
      <year>2015</year>
   </subject>
   
   <subject>
      <course>Microsoft</course>
      <country>India</country>
      <company>TutorialsPoint</company>
      <price>$25</price>
      <year>2015</year>
   </subject>
</catalog>

它将产生以下结果-