[求助]一个很简单的验证问题,就是要报错啊!求救!(页 1) - Ajax论坛 - 编程论坛

独孤无痕 发表于 2007-1-30 17:16

[求助]一个很简单的验证问题,就是要报错啊!求救!

HTML代码是这样的
<html> <head> <title>Using Ajax for validation</title> <script type="text/javascript"> var xmlHttp=false;
 function createXMLHttpRequest() { if (window.ActiveXObject) { xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); } else if (window.XMLHttpRequest) { xmlHttp = new XMLHttpRequest(); } if (!xmlHttp) { // 异常，创建对象实例失败 window.alert("不能创建XMLHttpRequest对象实例."); return false; } } function validate() { createXMLHttpRequest(); var f = document.form1; var birthDate = f.birthDate.value; var url = "servlet/Servlet1?birthDate"+birthDate; xmlHttp.open("GET", url, true); xmlHttp.onreadystatechange = callback; xmlHttp.send(null); }
 function callback() { if (xmlHttp.readyState == 4) { if (xmlHttp.status == 200) { var mes = xmlHttp.responseXML.getElementsByTagName("message")[0].firstChild.data; var val = xmlHttp.responseXML.getElementsByTagName("passed")[0].firstChild.data; alert(mes); alert(val); } } } 
 </script> </head> <body> <h1>Ajax Validation Example</h1> <form name="form1" action="" method="POST"> Birth date: <input type="text" size="10" id="birthDate" onchange="validate();"/>
 </form> </body> </html>

servlet代码是这样的:
package mypackage; import java.text.ParseException; import java.text.SimpleDateFormat; import javax.servlet.*; import javax.servlet.http.*; import java.io.PrintWriter; import java.io.IOException;
public class Servlet1 extends HttpServlet { private static final String CONTENT_TYPE = "text/html; charset=GBK";
 public void init(ServletConfig config) throws ServletException { super.init(config); }
 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType(CONTENT_TYPE); PrintWriter out = response.getWriter(); boolean passed = validateDate(request.getParameter("birthDate"));//调用方法检验 response.setHeader("Cache-Control","no-cache"); request.setCharacterEncoding("UTF-8"); //设置输出的信息的格式及字符集 response.setContentType("text/xml; charset=UTF-8"); String message = "You have entered an invalid date."; if (passed) { message = "You have entered a valid date."; } out.println("<response>"); out.println("<passed>" + Boolean.toString(passed) + "</passed>"); out.println("<message>" + message + "</message>"); out.println("</response>"); out.close(); } private boolean validateDate(String date) { boolean isValid = true; if(date != null) { SimpleDateFormat formatter= new SimpleDateFormat("MM/dd/yyyy"); try { formatter.parse(date); } catch (ParseException pe) { System.out.println(pe.toString()); isValid = false; } } else { isValid = false; } return isValid; } } 运行HTML没有问题,但是输入字符后网页左下角就提示出错了真的不晓得是怎么回事了.谢谢[em01]

qjq001 发表于 2007-2-9 19:32

过来看看

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[求助]一个很简单的验证问题,就是要报错啊!求救!