javascript - Tracking if backspace or delete key is pressed in an input field -

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i wondering how can track if users hit backspace or delete key in input field. afterwhich add variable called count each time buttons pressed. have code not seem work; great appreciated, thank you.

var count = 0;  var input = document.getelementbyid('display');  input.onkeydown = function() {     var key = event.keycode || event.charcode;      if( key == 8 || key == 46 )         count++;         return false; };

multiple lines inside conditional or loop, etc. need wrapped in braces:

if( key == 8 || key == 46 ) {     count++;     return false; }

you want add default return true last line differentiate whether entered if or not well.


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