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How to disable the default browser help function

I want to disable or override the default browsers help function.

I tried to look at some examples on the Internet, but they do not work for me. (The following code works on Firefox and Chrome, but not on Opera and IE)

<html> <title> </title> <body> <script src = "jquery-1.7.1.min.js" text="type="text/javascript""></script> <script language="javascript" type="text/javascript"> document.onkeydown = function(event) { if(window.event && window.event.keyCode == 112) { event.stopPropagation(); event.preventDefault(); event.keyCode = 0; return false; //document.onhelp = new Function("return false;"); //window.onhelp = new Function("return false;"); //helpFunction(); } else if(event.which == 112) { helpFunction(); } }; var false_function = new function(){"return false";}; shortcut.add("f1",false_function); var helpFunction = function() { alert('help'); } </script> <h2>Test</h2> </body>

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I found here this code that was hacked to work in every version of IE and FF

 <script type="text/javascript"> function avoidInvalidKeyStorkes(evtArg) { var evt = (document.all ? window.event : evtArg); var isIE = (document.all ? true : false); var KEYCODE = (document.all ? window.event.keyCode : evtArg.which); var element = (document.all ? window.event.srcElement : evtArg.target); var msg = "We have disabled this key: " + KEYCODE; if (KEYCODE == "112") { if (isIE) { document.onhelp = function() { return (false); }; window.onhelp = function() { return (false); }; } evt.returnValue = false; evt.keyCode = 0; window.status = msg; evt.preventDefault(); evt.stopPropagation(); alert(msg); } window.status = "Done"; } if (window.document.addEventListener) { window.document.addEventListener("keydown", avoidInvalidKeyStorkes, false); } else { window.document.attachEvent("onkeydown", avoidInvalidKeyStorkes); document.captureEvents(Event.KEYDOWN); } </script>

JSFiddle work. Note that you must test it by clicking the result tab.

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Source: https://habr.com/ru/post/1393174/

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