spring - Thymeleaf - Conditional Attributes only showing for a split second in html -

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i working on spring web application. tried write function checks whether if entered password correct. code controller:

@requestmapping(value = "/login", method = requestmethod.post) public modelandview loginuser(@modelattribute user user) throws filenotfoundexception {     if (patient.getpasswort().equals(patient.getpasswortconfirm())) {         service.login(user);         modelandview modelandview = new modelandview("mainpage");         modelandview.addobject("user", user);         return modelandview;     } else {         modelandview modelandview = new modelandview("login");         modelandview.addobject("wrongpw", true);         return modelandview;     }  }

this code html page:

<!doctype html> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org"> <head> <link rel="shortcut icon" type="image/ico" href="image/favicon.ico" /> <meta charset="utf-8" /> <link rel="stylesheet" href="css/main.css" /> <script src="lib/jquery-2.1.4.js"></script>   </head>  <body> <div id="menuebg"></div>   <p th:if="${wrongpw}"><font color="red">password wrong</font></p> <div id="menue">  <form action="01erstellen" method="post"  th:object="${patient}">   <table border="0px">     <tr height="20px"> <td>name: <input th:field="*{nachname}" onchange="namelive();"   type="text" id="txtname" value="" /> </td> </tr>  <tr height="20px"> <td>vorname: <input th:field="*{vorname}" onchange="vornamelive();" type="text" id="txtvorname" value="" /> </td> </tr>  <tr height="20px"> <td>email: <input th:field="*{email}" type="text" />  </td>  </tr>   <tr height="20px">  <td><label for="gebdat"> geburtsdatum: <input th:field="*{geburtstag}" type="date" id="gebdat" /> </label></td> </tr>  <tr height="20px"> <td><label for="passwd">passwort: <input th:field="*{passwort}" type="password" id="passwd" size="20" maxlength="40" /> </label></td> </tr>  <tr height="20px"> <td><label for="passwd-confirm">wiederholen: <input th:field="*{passwortconfirm}"                                                                type="password" id="passwd-confirm" size="20" maxlength="40" /> </label></td> </tr>  <tr height="20px"> <td></td> </tr> <tr height="20px"> <td> <br/> <input id="btn-send" type="submit" value="finish" /> </td> </tr>  <tr height="20px"> <td></td> </tr>  </table>  </form> </div>   </body> </html>

my problem if type in wrong password text shows split second disappears. can me? thank you!


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