Ajax no flush determines whether NULL is used when registering a username _ajax related

Source: Internet
Author: User
Tags flush
Copy code code as follows:

var xmlHttp;
UName ()//user name loses focus
{
if (all.uname.==)
{
All.l1.innerhtml= ' cannot be empty! ";
SetTimeout ("Close (1)", 1500);
return;
}
Else
{
xmlhttp=new activexobject ("Microsoft.XMLHTTP");
Xmlhttp.onreadystatechange=deal//callback function
var url= "ajax.aspx?user=" +all.uname.+ "";//the page that is going to detect the user name
Xmlhttp.open ("Get", url,true); Submits the form to the URL in get mode, and initiates a step to process
Xmlhttp.send (null);//Send
}
}
Deal ()
{
//alert (XMLHTTP.R eadystate+ "__" +xmlhttp.status);
if (xmlhttp.readystate!=4)
{return;}

if (xmlhttp.status!=200)//equals 500 is an error of the SQL statement or database
{return;}
//

var num = xmlhttp.responsetext;///Receive server send information
//alert (num);
all.l1.innertext= ""; The
if (num>0)
{
all.l1.innertext= ' secondary username is already in use! ";
}
Else
{
all.l1.innertext= "√";
}

}
Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.