onKeyPress event not working in Firefox

问题

I have the following javascript code...Here I am using onKeyPress="someFunction( )" in the body tag to get the keyCode of the key that is pressed.

The code is working fine in IE8 but this is not working in Firefox.

Please give some solution to this.

<html>
<head>
<title>onKeyPress( ) event not working in firefox..</title>
<script>
function printDiv()
{
  var divToPrint=document.getElementById('prnt');
  newWin=window.open(''+self.location,'PrintWin','left=50,top=20,width=590,height=840,toolbar=1,resizable=1,scrollbars=yes');
  newWin.document.write(divToPrint.outerHTML);
  newWin.print();
  //newWin.close();
}
</script>

<script>
function keypress()
{
  alert(event.keyCode);
  var key=event.keyCode;
  if(key==112 || key==80)
 printDiv();
  else if(key==101 || key==69)
    window.location="http://google.com";
  else if(key==114 || key==82)
    window.reset();  
}
</script>
</head>
<body bgcolor="lightblue" onkeypress="keypress()">

Thanks in advance.....

Here is the total code which is working fine in IE8 and not working in Firefox.

<!DOCTYPE html>
<html>
    <head>
    <title>Please help me out</title>
    <script type="text/javascript">
    function printDiv()
    {
      var divToPrint=document.getElementById('prnt');
      newWin=window.open(''+self.location,'PrintWin','left=50,top=20,width=590,height=840,toolbar=1,resizable=1,scrollbars=yes');
      newWin.document.write(divToPrint.outerHTML);
      newWin.print();
    }
    </script>

    <script type="text/javascript">
    function keypress(val)
    {
      //-----------------------------------------------------   
      //alert('nnnn');
      //alert(window.event ? event.keyCode : val.which);  
      //if(val.which != 0 && val.charCode != 0)
      // alert('Firefox'+String.fromCharCode(val.which));
      //else
      // alert('IE'); 
      //------------------------------------------------------- 
      var key=event.keyCode;
      if(key==112 || key==80 || val=="print")
        printDiv();
      else if(key==101 || key==69 || val=="exit")
        window.location="http://google.co.in";
      else if(key==114 || key==82 || val=="refresh")
        document.forms[0].reset();  
      else
        event.returnValue=true;
    }
    </script>
</head>
<body bgcolor="lightblue" topmargin="0" leftmargin="0"marginwidth="0px" marginheight="0px" onkeypress="keypress(null)">
<table align="left" border="1" cellpadding="5" cellspacing="0" style="width: 100%;height:100%">
<tbody>
<tr><td width="20%" valign="top">ccccccccccc</td>
    <td width="80%" align="center">
        <table style="width: 100%" border="0" valign="top">
        <tr align="right">
        <td valign="top">
        <button value="refresh" accesskey="R" onclick="keypress(this.value)">
            <b><u>R</u></b>efresh
        </button>
        <button value="print" accesskey="P" onclick="keypress(this.value)">
            &nbsp;&nbsp;<b><u>P</u></b>rint&nbsp;&nbsp;
        </button>
        <button value="exit" accesskey="E" onclick="keypress(this.value)">
            &nbsp;&nbsp;&nbsp;<b><u>E</u></b>xit&nbsp;&nbsp;&nbsp;
        </button>
        </td></tr>
        </table> 
        <h3>Press the letters P->Print , E->Exit etc....</h3>   
        <h1>Just a test for keypress event</h1>
        <form action="http://google.co.in" method="Post">
            <div id="prnt">
                zzzzzzzzzzzzzzz
            </div>
        </form>
    </td>
</tr>
</tbody>
</table></body></html>

回答1:

When problems like this show up, I start to use any kind of a JavaScript framework. Those frameworks are build to avoid problems with different browsers.

To catch all different keypress() apis, like the link from Emmett shows, can be very difficult.

Example:

In HTML head:

<script src="http://code.jquery.com/jquery-1.4.4.js"></script>

In the JS tag:

$(document).keydown(function(event) {
 alert('You pressed '+event.keyCode);
 event.preventDefault();
});

回答2:

Browsers have different ways of handling keyboard events. Have a look at http://unixpapa.com/js/key.html for more info.

For example, these changes to your code will get it working in Firefox:

<body bgcolor="lightblue" onkeypress="keypress(e)">

and

function keypress(e) {
    alert(window.event ? event.keyCode : e.which);
    // other stuff
}

回答3:

Pass event object as an parameter and your code will work in IE as well as firefox. The code example is as follows :

<body bgcolor="lightblue" onkeypress="keypress(event)">

function keypress(event) {
  alert(event.keyCode);
  var key=event.keyCode;
  if(key==112 || key==80)
      printDiv();
  else if(key==101 || key==69)
      window.location="http://google.com";
  else if(key==114 || key==82)
      window.reset();  
}

回答4:

I think Firefox are not caring programmers... and this is the reason why so, In Firefox navigator.appName returns "Netscape". so user can edit his code like,

if(navigator.appName == "Netscape") 
    Key = event.charCode; //or e.which; (standard method)
else 
    Key = event.keyCode;

来源：https://stackoverflow.com/questions/4496910/onkeypress-event-not-working-in-firefox

标签

javascript

firefox

javascript-events

onkeypress