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嗨,我開始使用jsp今天,我想編寫一個簡單的登錄jsp頁面。我應該如何使用我的腳本來顯示警報?
現在我試圖在沒有成功登錄時顯示警報。
,這裏是我的jsp頁面
<body contenteditable="false">
<p><%= request.getAttribute(Constants.ERROR)%></p>
<script>
if (!$(<%= request.getAttribute(Constants.ERROR)%>).isEmptyObject()) {
alert("Veuillez confirmer mot de passe et le username");
}
</script>
<!-- Static container -->
<div class="login-wrap">
<div class="login-html">
<input id="tab-1" type="radio" name="tab" class="sign-in" checked="" contenteditable="false"><label contenteditable="false" for="tab-1" class="tab">Se connecter </label>
<input id="tab-2" type="radio" name="tab" class="sign-up" contenteditable="false" ><label contenteditable="false" for="tab-2" class="tab">S'inscrire</label>
<div class="login-form">
<div class="sign-in-htm">
<form action="./UserConnect" name="login">
....
</form>
這裏是我的servlet用戶登陸:
@WebServlet(name = "UserConnect", urlPatterns = {"/UserConnect"})
public class UserConnect extends HttpServlet {
@EJB
private UtilisateurFacadeLocal utilisateurFacade;
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username = request.getParameter(Constants.USERNAME);
String password = request.getParameter(Constants.PASSWORD);
String email ="";
boolean doLogin = utilisateurFacade.doLogin(username, password, email);
System.out.println("do login "+doLogin);
if (doLogin) {
response.sendRedirect("https://www.google.fr");
}else{
request.setAttribute(Constants.ERROR, "login ou mot de passe incorrecte");
RequestDispatcher requestDispatcher = getServletContext().getRequestDispatcher("/Login.jsp");
requestDispatcher.forward(request, response);
}
}
`
我<p>
很好顯示的消息,但沒有警告我該怎麼辦?