Input original version, later modified

(function ($) {
function Inputauto (obj) {
init={
Inputclass: ". Js_input",
Password_tag: "Password",
pswhtml: ' <input class= "input" type= "text" value= "" placeholder= ""/> ",
Pswclass: ' ADDPSW ',
Wrapclass: ' Psw_wrap ',
Wrap: ' <span></span> '
}
This.init=$.extend (Init,obj);
}

inputauto.prototype={
Main:function () {
var _this=this,i=this.init,
Initval= ";

$ (I.inputclass). each (function () {

Initval=_this.getholder (this);
_this.input_def (This,initval);
})
_this.focus ();
_this.blur ();
},
Focus:function () {
var _this=this,i=this.init, $tempInput;
$ (I.inputclass). On ("Focus", function () {
var init=$ (this). attr ("Data-placeholder"),
Initusr= "";

if (_this.getholder (this)! = "") {
Initusr=_this.getholder (this);
}else{
initusr=$ (This). attr ("Data-placeholder-old");
}

if ($ (this). val ()! = "" && $ (this). Val ()!=initusr && Init!=i.password_tag) {//have new input to save input value
$ (this). attr ("Data-userval", $ (this). Val ());
};

$ (this). Val ("");
$ (this). attr (' Data-placeholder-old ', initusr);

if (_this.placeholder ()) {
$ (this). attr (' placeholder ', ');
}

if (Init==i.password_tag) {
if (_this.navie () && $ (this). Hasclass (I.pswclass)) {//ie78 replaces the TXT element of PWD
var $prev =$ (this). Prev ();
var t=_this.getholder ($prev [0]);
var $tobj =$ (this). Prev ();

$tobj. Show (). Val (""). attr (' Data-placeholder-old ', t);
$ (this). attr (' Data-placeholder-old ', T). Hide ();
$tobj. focus ();

}else{
$ (this). attr ("type", "password");
}
}//
})
},
Blur:function () {
var _this=this,i=this.init;
$ (I.inputclass). On ("Blur", function () {
var init=$ (this). attr ("Data-placeholder"),
Holder=_this.getholder (This),
initusr=$ (This). attr ("Data-placeholder-old"),
usrval=$ (This). attr ("Data-userval");

if ($ (this). val () = = "" && (! ( _this.navie ()) | | Init!=i.password_tag)) {
Usrval?_this.input_def (This,usrval): _this.input_def (THIS,INITUSR);
};

if (Init==i.password_tag && (This). val () = = "" | | $ (this). Val () ==initusr)) {//password blank display prompt

if (_this.navie () &&!$ (this). Hasclass (I.pswclass)) {//ie78 under PWD element
Alert (Usrval)
$ (this). Next (). Show (). val (holder). End (). hide ();
}else{
$ (this). attr ("type", "text");
}
}
})
},
Placeholder:function () {
Return ' placeholder ' in document.createelement (' input ');
},
Input_def:function (obj,init) {
var _this=this,i=this.init;
$ (obj). Val ("");
if (!_this.placeholder ()) {
$ (obj). val (init);
if ($ (obj). attr ("type") = = = "Password") {
_this.chagetype (Obj,init);
}
}else{
$ (obj). attr (' placeholder ', init);
($ (obj). attr ("type") = = "Password")? $ (obj). Val (""): $ (obj). val (init);
}
},
Chagetype:function (obj,init) {
var _this=this,i=this.init;

If (_this.navie ()) {
if (!$ (obj). Parent (). Hasclass (I.wrapclass)) {
$ (obj). Wrap (I.wrap);
$ (obj). Parent (). addclass (I.wrapclass). Append (i.pswhtml). End (). Next (). addclass (I.pswclass). Val (init). attr (" ID "," psw_ "+$ (obj). attr (" id ")). attr (" Data-placeholder ", I.password_tag). End (). hide ();
}
}else{
if ($ (obj). attr ("type") = = "Password") $ (obj). attr ("type", "text");
}
},
Navie:function () {
if (navigator.appname = = "Microsoft Internet Explorer" && ( Navigator.appVersion.split (";") [1].replace (/[]/g, "") = = "MSIE7.0" | | Navigator.appVersion.split (";") [1].replace (/[]/g, "") = = "MSIE8.0")) {
return true;
} else{
return false;
}
},
Getholder:function (obj) {
var _this=this, initval= "";
if (!_this.placeholder ()) {
Initval= obj.attributes[' placeholder '].nodevalue;
}else{
initval=$ (obj). attr ("placeholder");
}
return initval;
}
}

var inputauto_inst=new inputauto ({inputclass: ". Input"});
Inputauto_inst.main ();

}) (JQuery);

Input original version, later modified