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javascript读取xml实现javascript分页

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复制代码 代码如下:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>读取Xml并分页</title>

</head>

<body >
   <div id="gao">

   </div>
    <div>
       <table align="center">
          <tr>
             <td><input type="button" name="prev" id="prev" value="上一页"  onclick="showPage('false')"><input type="button" id="next" name="next" value="下一页" onclick="showPage('true')"> </td>
          </tr>
       </table>
    </div>
<script type="text/javascript">
     function LoadXML(url)
  {
  var xmlDoc;
  if(window.ActiveXObject)
  {
     xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
     xmlDoc.async="false";
     xmlDoc.load(url);     

  }else if(document.implementation&&document.implementation.createDocument)
  {
              xmlDoc=document.implementation.createDocument("","",null);
     xmlDoc.async=false;
     xmlDoc.load(url);
  }else
  {
     alert("You browser cannot handle this script!");
  }
  return xmlDoc;
  }


  var xmlDoc=LoadXML("student.xml");
  var students=xmlDoc.getElementsByTagName("student");
  var stuLength=students.length;
  var currentPage=0;
  var pageSize=2;
  var maxPage=Math.ceil(stuLength/pageSize);

  function showPage(page)
  {
  var mytable=document.getElementsByTagName("table")[1];
  if(mytable) document.body.removeChild(mytable);
  var table=document.createElement("table");
  table.setAttribute("id","mytable");
  table.setAttribute("width","600");
  table.setAttribute("border","1");
     document.body.appendChild(table);

  var header=table.createTHead();
  var headerrow=header.insertRow(0);
     headerrow.insertCell(0).appendChild(document.createTextNode("姓名"));
  headerrow.insertCell(1).appendChild(document.createTextNode("学校"));
  headerrow.insertCell(2).appendChild(document.createTextNode("成绩"))
       if(page=="true")
    currentPage++;
    else
      currentPage--;
    if(currentPage>=maxPage) currentPage=maxPage;
    else if(currentPage<=0) currentPage=1;
    var start=(currentPage-1)*pageSize;
    var end=currentPage*pageSize-1;

    for(var i=start;i<=end;i++)
    {
             var e=students[i];
    var name=e.getAttribute("name");
    var school=e.getElementsByTagName("school")[0].firstChild.data;
    var grade=e.getElementsByTagName("grade")[0].firstChild.data;
    var row=table.insertRow(i%pageSize+1);
    row.insertCell(0).appendChild(document.createTextNode(name));
    row.insertCell(1).appendChild(document.createTextNode(school));
    row.insertCell(2).appendChild(document.createTextNode(school));
    }

   
  }

  showPage("true");

</script>
</body>
</html>


在编写过程过,涉及到代码的处理上,由于我最初,将javascript代码放在了head标签里面,结果导致document.body对象为空!
我们都知道,javascript在执行的时候,页面会暂定加载而去执行html代码,所以当js代码放在head标签中的时候,html页面还没有执行到body,故而产生了错误!
后来将js代码,放在了body的尾部,这样,就能够正确引用到body对象了!
同时,在大型网站架构中,也是提高页面加载速度的一种方式!页面首页加载html标签内容,到页面最后,在执行js代码,能在很大程度上提升网页打开速度,提升用户体验!
另外的student.xml内容是
复制代码 代码如下:

<?xml version="1.0" encoding="utf-8"?>
<students>
   <student name="gaoxing">
       <school>西北大学1</school>
    <grade>76</grade>
   </student>
   <student name="gaoxing">
       <school>西北大学2</school>
    <grade>76</grade>
   </student>
   <student name="gaoxing">
       <school>西北大3学</school>
    <grade>76</grade>
   </student>
      <student name="gaoxing">
       <school>西北大学4</school>
    <grade>76</grade>
   </student>
      <student name="gaoxing">
       <school>西北大5学</school>
    <grade>76</grade>
   </student>
      <student name="gaoxing">
       <school>西北大6学</school>
    <grade>76</grade>
   </student>
      <student name="gaoxing">
       <school>西北大7学</school>
    <grade>76</grade>
   </student>
      <student name="gaoxing">
       <school>西北8大学</school>
    <grade>76</grade>
   </student>
      <student name="gaoxing">
       <school>西北9大学</school>
    <grade>76</grade>
   </student>
      <student name="gaoxing">
       <school>西北10大学</school>
    <grade>76</grade>
   </student>
      <student name="gaoxing">
       <school>西北大学</school>
    <grade>76</grade>
   </student>
      <student name="gaoxing">
       <school>西北大学</school>
    <grade>76</grade>
   </student>
      <student name="gaoxing">
       <school>西北大学</school>
    <grade>76</grade>
   </student>
      <student name="gaoxing">
       <school>西北大学</school>
    <grade>76</grade>
   </student>
</students>

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