1. 页面 *.aspx 前台代码如下: 1＜body＞ 2 ＜form id="form1" runat="server"＞ 3 ＜script type="text/javascript"＞ 4 var cbo = new CallBackObject(); 5 cbo.OnComplete=Cbo_Complete; 6 cbo.OnError=Cbo_Error; 7 function CheckUserName(UserName) 8 { 9 var msg = document.getElementById(‘lblMessage‘); 10 if( UserName.length ＞ 0 ) 11 { 12 cbo.DoCallBack(‘tbUsername‘,‘‘); 13 } 14 else 15 { 16 cbo.AbortCallBack(); 17 msg.innerHTML = ‘‘; 18 } 19 } 20 function Cbo_Complete(responseText, responseXML) 21 { 22 var msg = document.getElementById(‘lblMessage‘); 23 if( responseText == ‘0‘ ) 24 { 25 msg.innerHTML = ‘合法用户!‘; 26 msg.style.color=‘green‘; 27 } 28 else if( responseText == ‘1‘ ) 29 { 30 msg.innerHTML = ‘用户名长度必须在 3 到 15 之间, 且不包含字母/数字/下划线以外的字符!‘; 31 msg.style.color = ‘red‘; 32 } 33 else 34 { 35 msg.innerHTML = ‘用户名不存在!‘; 36 msg.style.color = ‘red‘; 37 } 38 } 39 function Cbo_Error( status, statusText, responseText ) 40 { 41 //alert( ‘status=‘ + status + ‘ responseText=‘ + responseText + ‘ statusText=‘ + statusText ); 42 }
