發(fā)一個(gè)簡(jiǎn)單案例:
前臺(tái):
%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
html>
head>
title>用戶登錄/title>
script type="text/javascript" src="../js/jquery-easyui-1.3.5/jquery.min.js">/script>
script type="text/javascript" src="../js/jquery-easyui-1.3.5/jquery.easyui.min.js">/script>
link rel="stylesheet" href="../js/jquery-easyui-1.3.5/themes/default/easyui.css" type="text/css">/link>
link rel="stylesheet" href="../js/jquery-easyui-1.3.5/themes/icon.css" type="text/css">/link>
script type="text/javascript" src="../js/jquery-easyui-1.3.5/locale/easyui-lang-zh_CN.js">/script>
meta http-equiv="content-type" content="text/html;charset=UTF-8" />
script type = "text/javascript" charset = "UTF-8">
$(function(){
var loginDialog;
loginDialog = $('#loginDialog').dialog({
closable : false , // 組件添加屬性:讓關(guān)閉按鈕消失
//modal : true, //模式化窗口
buttons : [{
text:'注冊(cè)',
handler:function(){
}
},
{
text:'登錄',
handler:function(){
$.ajax({
url:'../servlet/Login_Do',
data :{
name:$('#loginForm input[name=name]').val(),
password:$('#loginForm input[name=password]').val()
},
dataType:'json',
success:function(r){
//var dataObj=eval("("+data+")");
alert("進(jìn)來(lái)了");
},
error:function(){
alert("失敗");
}
});
//alert(data)
}
}]
});
});
/script>
/head>
body style=”width:100%;height:100%;" >
div id = "loginDialog" title = "用戶登錄" style = "width:250px;height:250px;" >
form id = "loginForm" method = "post">
table>
tr>
th>用戶名 :/th>
td>input type = "text" class = "easyui-validatebox" data-options="required:true" name = "name">br>/td>
/tr>
tr>
th>密碼: /th>
td> input type = "password" class = "easyui-validatebox" data-options="required:true" name = "password">br>/td>/td>
/tr>
/table>
/form>
/div>
/body>
/html>
后臺(tái):
public class Login_Do extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
String name =request.getParameter("name");
String password = request.getParameter("password");
String js = "{\"name\":name,\"password\":password}";
PrintWriter out = response.getWriter();
JSONObject json = new JSONObject();
json.put("name",name);
out.print(json.toString());
response.getWriter().write(json.toString());
}
}
點(diǎn)擊登錄時(shí):
解決辦法:彈出error信息一般有兩種可能:
第一種:url錯(cuò)誤,后臺(tái)直接得不到值
可以用火狐的firebug查看:如果響應(yīng)了信息,則不是這個(gè)問(wèn)題,那么就有可能是第二種情況:
返回?cái)?shù)據(jù)類型錯(cuò)誤:
在我這個(gè)例子中,返回的數(shù)據(jù)無(wú)意中打印了兩次,這兩句刪去一句就好了:
out.print(json.toString());
response.getWriter().write(json.toString());
造成了錯(cuò)誤。這時(shí)在firebug顯示的信息是:
以上就是為大家分析的用ajax返回驗(yàn)證的時(shí)候總是彈出error的原因,希望對(duì)大家解決此類問(wèn)題有所幫助。
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