Now I'm is develop a AuthenticationFilter, If user browse the page when he did not login the web,the filter where alert a dialog in the current page,and then user input his username and password in the dialog form then skip to the page (best the page will not refresh). I know how the filter redirect to the login page when users didn't logined. But I don't know how the filter can alert a dialog. Can anyone help me. Are there any examples for me ,thanks a lot.
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