Ajax submission form implementation web page with no refresh registration example

  • 2020-03-30 02:53:59
  • OfStack

Ajax no refresh


var xmlHttp;  
uName() //When the username loses focus & NBSP;
{  
 if(all.uname.=="")  
 {  
  all.l1.innerHTML=" Can't be empty! ";  
  setTimeout("close(1)",1500);  
  return;  
 }  
 else  
 {  
  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");  
  xmlHttp.onreadystatechange=deal; //Callback function & NBSP;
  var url="aJax.aspx?user='"+all.uname.+"'"; //You will jump to the page that detects the username & NBSP;
  xmlHttp.open("get",url,true); //Submit the form to the url in get mode; And start a one-step process & NBSP;
  xmlHttp.send(null); //Send  
 }  
}  
deal()  
{  
 //alert(xmlHttp.readystate+"__"+xmlHttp.status);  
 if(xmlHttp.readystate!=4)  
 {return; }  
 if(xmlHttp.status!=200)  //Equals 500 is an SQL statement or database error & NBSP;
 {return;}  
 //  
 var num = xmlHttp.responseText; //Receive the message sent by the server & NBSP;
 //alert(num);  
 all.l1.innerText="";  
 if(num>0)  
 {  
  all.l1.innerText=" The secondary username has been used! ";  
 }  
 else   
 {  
  all.l1.innerText=" Square root ";  
 }  
}


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