dwr防止註冊用戶重複，並防止表單提交

dwr框架配置很容易，就不介紹了

 

javascript代碼

 

function sameUserName()
{   
	
	var  user = dwr.util.getValue('user');
	userName.validateName(user,hello);
}

 function hello(result){
               if(result){
            document.getElementById("userName").innerHTML="<font size='2' color='green'> 用戶可以被註冊</font>"
            	document.getElementById("submit_btn").removeAttribute("disabled");      //回覆提交按鈕
        }else{
			document.getElementById("userName").innerHTML="<font size='2' color='red'> 用戶已經被註冊</font>"
				document.getElementById("submit_btn").disabled = "true";;//阻止submit按鈕  
        }
       
  }    
  

 

 <tr><td width="40%" align="right"><font color="red">*</font>用戶名:</td><td><input type="text" id="user" name="user"  οnblur="sameUserName()"></input></td>
  <td> <div id="userName"></div> </td></tr>
  <td><input type="submit" id="submit_btn" name ="submit_btn" value="註冊" />