Front desk:
<TD class= "IN-CTT" width= "35%" ><input type= "text" name= "email" id= "email" required= "required"/><div ID = "Content" ></div>
Ajax:
$ (document). Ready (function () {
$ ("#email"). blur (function () {
$ ("#email"). CSS ("Background-color", "#D6D6FF");
$.ajax ({type: "post", url: "check_email.do", data:{' email ': $ ("#email"). Val ()},
Success:function (data) {
if (data==2) {
$ ("#content"). HTML ("<p> mailbox already exists </p>");
$ (". Btn"). attr ("Disabled", true);
}
if (data==1)
{
$ ("#content"). HTML ("<p></p>");
$ (". Btn"). attr ("disabled", false);
}
if (data==13)
{
$ ("#content"). HTML ("<p> mailbox cannot be empty </p>");
$ (". Btn"). attr ("Disabled", true);
}
}
});
});
});
Background data processing:
@RequestMapping ("Check_email.do")
public void Checkemail (HttpServletRequest request, httpservletresponse response) throws IOException {
PrintWriter out= Response.getwriter ();
String email= request.getparameter ("email");
Check if the database has duplicate names
Boolean exist = service.emailexist (email);
if (!exist) {
Servlets.writehtml (Response, "1");
} else {
Servlets.writehtml (Response, "2");
}
if (Stringutils.isblank (email))
Servlets.writehtml (Response, "3");
Out.close ();
/*if (Stringutils.isblank (email)) {
Servlets.writehtml (response, "false");
Return
}
if (stringutils.equals (email, original)) {
Servlets.writehtml (Response, "true");
Return
}
Check if the database has duplicate names
Boolean exist = service.emailexist (email);
if (!exist) {
Servlets.writehtml (Response, "true");
} else {
Servlets.writehtml (response, "false");
}*/
}
Yuan Sheng Backstage:
protected void doget (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException {
Response.setcontenttype ("Text/html:charset=utf-8");
Response.setcharacterencoding ("Utf-8");
PrintWriter out= Response.getwriter ();
Request.setcharacterencoding ("Utf-8");
String username= request.getparameter ("username");
String password= request.getparameter ("password");
if (Username.equals ("Hong Fan"))
{
/*out.println ("<p>" +username+ "</p>"); */
Out.println ("1");
/*out.println ("<p>" +password+ "</p>");
Out.println ("<p>" + "User name accurate" + "</p>"); */
}else{
Out.print (username);
Out.print ("User name or password error");
}
Out.close ();
}
jquery Check textarea required
<script type= "Text/javascript" >
$ ("#sub1)." Click (function () {
var text1=$ ("#text1"). Val ();
if (text1== "") {
Alert ("Cannot be empty!");
$ ("#text1"). Select ();
$ ("#text1"). focus ();
}else{
$ ("#form1"). Submit ();
}
})
</script>
<body>
<form id= "Form1" method= "Post" action= "" >
<input type=text id= "Text1"/>
<input type= "Submit" id= "Sub1" value= "Commit" >
</form>
</body>
Email Ajax Transfer Data deduplication and non-null judgments