15
votes
7answers
631 views

How the user should be informed that the file she submitted is not an image?

In a given web application, the user can upload images. Currently, when the user uploads something which is not an image, the JavaScript alert box with the message "Please Select only Image Files!!" ...
6
votes
2answers
200 views

Question mark in alert's caption

My doubt might seems a bit silly, but still... Should the caption of an alert/prompt popup have question mark at the end? For example, let's say that I have to issue a prompt to as for confirmation ...
8
votes
1answer
305 views

Message Fade Timing

Sometimes one wishes to display a message for some time before removing it in some way (in my case fading). When implementing this idea, a problem arises: how long should the message remain fully ...