Original method (missing cursor verification database)

Last Update:2018-12-06 Source: Internet

Author: User

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Page code:

<HTML xmlns = "http://www.w3.org/1999/xhtml">
<Head runat = "server">
<Title> </title>
<SCRIPT type = "text/JavaScript">
Function $ (e ){
Return document. getelementbyid? Document. getelementbyid (e): NULL;
}
Function check (name ){
VaR XMLHTTP = false;
VaR url = "handler1.ashx? Name = "+ name +" & RD = "+ math. Random ();
Createxmlhttp ();
Ajax_process (URL );
}
Function ajax_process (URL ){
XMLHTTP. Open ("Post", URL, true );
XMLHTTP. onreadystatechange = ajax_sumbitemployment;
XMLHTTP. Send (null );
Function ajax_sumbitemployment (){
If (XMLHTTP. readystate = 4 ){
If (XMLHTTP. Status = 200 ){
If (XMLHTTP. responsetext = "validatenull "){
$ ('Label1'). innertext = "the user name cannot be blank! ";
Return;
}

If (XMLHTTP. responsetext = "smalllength "){
// $ ('Label1'). innertext = "cannot be less than 2 Characters! ";
Alert ("5432323 ");
Return;
}
If (XMLHTTP. responsetext = "exist "){
$ ('Label1'). innertext = "the user name already exists. Please select another user name! ";
Return;
}
Else {
$ ('Label1'). innertext = "Congratulations, you can use the user name! ";
}
}
}
}
}
// Create an Ajax object
Function createxmlhttp (){
Try {XMLHTTP = new activexobject ("msxml2.xmlhttp ");}
Catch (e ){
Try {XMLHTTP = new activexobject ("Microsoft. XMLHTTP ");}
Catch (e ){
Try {XMLHTTP = new XMLHttpRequest ();}
Catch (e) {XMLHTTP = false ;}
}
}
}
</SCRIPT>
</Head>
<Body>
<Form ID = "form1" runat = "server">
<Div>
<Asp: Label id = "label1" runat = "server" text = "label"> </ASP: Label>
<Asp: textbox id = "txtusernaem" runat = "server" onblur = "Return check (this. Value)"> </ASP: textbox>

<Asp: textbox id = "textbox1" runat = "server"> </ASP: textbox>
</Div>
</Form>
</Body>
</Html>

Processing file: handler1.ashx

  public class Handler1 : IHttpHandler
    {

public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";
//context.Response.Write("Hello World");
            string Name = context.Request.QueryString["Name"];
if (!String.IsNullOrEmpty(Name))
            {
if (Name.Length < 2)
                {
                    context.Response.Write("smallLength");
                }
else
                {
                    context.Response.Write("exist");
                }

// Maticsoft.BLL.Personnel person = new Maticsoft.BLL.Personnel();
// Maticsoft.Model.personnelDate personDate = person.GetModel(Name);

//if (personDate != null)
//{
//    context.Response.Write("exist");
//}
            }
else
            {

                context.Response.Write("validateNull");
            }

        }

public bool IsReusable
        {
get
            {
return false;
            }
        }
    }

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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Original method (missing cursor verification database)

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