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Why isn't backspace being detected using jquery keypress event?
$("#field").keypress(function(event){alert(event.which);}); 
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Try "onkeydown" instead of "onkeypress". KeyPress event is invoked only for character (printable) keys, KeyDown event is raised for all including nonprintable such as Control, Shift, Alt, BackSpace, etc. Using a variety of different examples, we have learned how to solve the Javascript Keypress Backspace Not Working.
The KeyPress event is not raised by non-character keys other than space and backspace; however, the non-character keys do raise the KeyDown and KeyUp events.
The keypress() method in jQuery triggers the keypress event whenever browser registers a keyboard input. So, Using keypress() method it can be detected if any key is pressed or not.
Try using keydownand keyupfunctions instead for IE.
Javascript e.keyCode doesn't catch Backspace/Del in IE
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