PHP Ajax XML解析器

Ajax XML示例

使用Ajax，我们可以从本地目录以及服务器解析xml。下面的示例演示如何使用Web浏览器解析xml。

<html>
   <head>

      <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>

   </head>
   <body>

      <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>

   </body>
</html>

上面的例子将使用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 ($i = 0;$i<$cd->length;$i++) {
      if ($cd->item($i)->nodeType == 1) {
         echo("<b>" . $cd->item($i)->nodeName . ":</b> ");
         echo($cd->item($i)->childNodes->item(0)->nodeValue);
         echo("<br>");
      }
   }
?>

的catalog.xml

XML文件，其中包含课程列表和详细信息。该文件由getcourse.php访问

<CATALOG>
   <SUBJECT>
      <COURSE>Android</COURSE>
      <COUNTRY>India</COUNTRY>
      <COMPANY>CodingDict</COMPANY>
      <PRICE>$10</PRICE>
      <YEAR>2015</YEAR>
   </SUBJECT>

   <SUBJECT>
      <COURSE>Html</COURSE>
      <COUNTRY>India</COUNTRY>
      <COMPANY>CodingDict</COMPANY>
      <PRICE>$15</PRICE>
      <YEAR>2015</YEAR>
   </SUBJECT>

   <SUBJECT>
      <COURSE>Java</COURSE>
      <COUNTRY>India</COUNTRY>
      <COMPANY>CodingDict</COMPANY>
      <PRICE>$20</PRICE>
      <YEAR>2015</YEAR>
   </SUBJECT>

   <SUBJECT>
      <COURSE>Microsoft</COURSE>
      <COUNTRY>India</COUNTRY>
      <COMPANY>CodingDict</COMPANY>
      <PRICE>$25</PRICE>
      <YEAR>2015</YEAR>
   </SUBJECT>
</CATALOG>

它会产生以下结果 -

XML解析器