img.js

java结合ajax编写的简易留言本

  var img_http_request = false;

  function img_send_request(url)
  {
    img_http_request = false;
    if(window.XMLHttpRequest)
    {
      img_http_request = new XMLHttpRequest();
      if (img_http_request.overrideMimeType)
      {
        img_http_request.overrideMimeType('text/xml');
      }
    }
    else if (window.ActiveXObject)
    {
      try
      {
        img_http_request = new ActiveXObject("Msxml2.XMLHTTP");
      }
      catch (e)
      {
        try
        {
          img_http_request = new ActiveXObject("Microsoft.XMLHTTP");
        } catch (e) {}
      }
    }
    if (!img_http_request)
    {
      window.alert("不能创建XMLHttpRequest对象实例.");
      return false;
    }
    img_http_request.onreadystatechange = img_processRequest;
	img_http_request.open("GET", url, true);
	img_http_request.send(null);
  }

  function img_processRequest()
  {
    if (img_http_request.readyState == 4)
    {
      if (img_http_request.status == 200)
      {
        //alert(img_http_request.responseText);
        img_init(img_http_request.responseXML);
      }
      else
      {
        alert("您所请求的页面有异常。");
      }
    }
  }

  function img_init(item)
  {

	//alert("img_init");
    var constants = item.getElementsByTagName("constants")[0];
    var title = constants.getElementsByTagName("title")[0];
    var imgs = constants.getElementsByTagName('image');
	//var titleItem = document.getElementById("title");
	//alert(titleItem);
	//titleItem.innerText = title;
	document.title = title + "::个性头像查看";

	var imgTable = document.getElementById("showImg");
	imgTable.deleteRow();
	imgTable.deleteRow();

	var len = imgs.length;
	var trItem;
	var tdItem;
	for(var i=0; i<len; i++)
	{
	  if(i%5==0)
	  {
		//alert("insertRow");
	    trItem = imgTable.insertRow();
		trItem.bgColor = "white";
	  }
	  var inner = "<img src=\"images/Image" + (i+1) + 
		  ".gif\" border=\"0\" width=\"32\" height=\"32\"><br>Image" + (i+1) + ".gif";
	  //alert(inner);
	  //var tmp = imgTable.insertCell().innerHTML = "<img src=\"images/Image" + (i+1) +
		//  ".gif\" border=\"0\" width=\"32\" height=\"32\"><br>Image" + (i+1) + ".gif";
	  tdItem = trItem.insertCell();
	  tdItem.innerHTML = inner;
	  tdItem.align = "center";
	}

    trItem = imgTable.insertRow();
	trItem.bgColor = "white";
	tdItem = trItem.insertCell();
	tdItem.innerHTML = "<button onClick=\"JavaScript:window.close(this.window);\">关闭窗口</button>";
	tdItem.colSpan = 5;
	tdItem.align = "center";

    //alert("76");
  }

  function solve_img()
  {
	//alert("solve_img");
    img_send_request("imgServlet");
  }