PHP Ajax XML解析器

Ajax XML示例

使用Ajax，我们可以解析本地目录和服务器上的XML。下面的示例演示了如何在Web浏览器中解析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>

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

<?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>");
      }
   }
?>

CATALOG.xml

包含课程列表和详细信息的XML文件。此文件由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>

它将产生如下结果−

PHP Ajax XML解析器