javascript - Detect printable keys -

i need detect whether key has been pressed printable key, character, possibly accented, number, space, punctuation symbol , on, or non printable key, enter, tab or delete.

is there reliable way in javascript, other listing non printable keys , hope not forget some?

i answered similar question yesterday. note have use keypress event character-related; keydown won't do.

i argue enter printable, way, , function considers be. if disagree, can amend filter out keypresses which or keycode property of event set 13.

function ischaracterkeypress(evt) {     if (typeof evt.which == "undefined") {         // ie, fires keypress events printable keys         return true;     } else if (typeof evt.which == "number" && evt.which > 0) {         // in other browsers except old versions of webkit, evt.which         // greater 0 if keypress printable key.         // need filter out backspace , ctrl/alt/meta key combinations         return !evt.ctrlkey && !evt.metakey && !evt.altkey && evt.which != 8;     }     return false; }  var input = document.getelementbyid("your_input_id"); input.onkeypress = function(evt) {     evt = evt || window.event;      if (ischaracterkeypress(evt)) {         // stuff here         alert("character!");     } });