dom events - Key code check in JavaScript not working for IE - Stack Overflow

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I tried to write a function to check key code with JavaScript. It's working fine for Firefox but not IE. Does anyone know what is going wrong with my code? Please see below code for more details:

function textCheck(e)
{
 var e = window.event || e
 alert("CharCode value: "+e.charCode)
 alert("Character: "+String.fromCharCode(e.charCode))
}

I tried to write a function to check key code with JavaScript. It's working fine for Firefox but not IE. Does anyone know what is going wrong with my code? Please see below code for more details:

function textCheck(e)
{
 var e = window.event || e
 alert("CharCode value: "+e.charCode)
 alert("Character: "+String.fromCharCode(e.charCode))
}

• javascript
• dom-events

Share Improve this question Follow edited Jan 21, 2023 at 0:08 Brian Tompsett - 汤莱恩 5,8937272 gold badges6161 silver badges133133 bronze badges asked May 8, 2009 at 1:04 Jin YongJin Yong 43.8k7272 gold badges144144 silver badges194194 bronze badges 1

• 1 Please add your call site so we can see how you are calling this function. – Adam Markowitz Commented May 8, 2009 at 1:09

Add a ment  | 

2 Answers 2

Sorted by: Reset to default 3

switch your first line of code:

...

var e = e || window.event;

...

and see if that helps.

Also, if it is a unicode character try something like the following:

function displayunicode(e) {
    var unicode=e.keyCode? e.keyCode : e.charCode
    alert(unicode)
}

If you're handling keydown instead of keypress, then things get a bit more plex... See: http://unixpapa./js/key.html

keyCode and charCode values behave slightly differently in different browsers and return different values for various events. Older versions of IE in particular don't support charCode. The first suggestion I have is to use a tool like jQuery to handle normalization of the key values across browsers. With jQuery you can use the e.which property on the event object to get the normalized value.

The other thing to do is use a key code checker to pare the values returned for each event for each browser. I built a handy online tool to do this and found it extremely useful to show all the keycodes/charcodes for each of the events at a glance:

http://www.west-wind./WestwindWebToolkit/samples/Ajax/html5andCss3/keycodechecker.aspx

Makes it real easy to experiment with different key binations and see how they pare on different browsers. jQuery's which and keypress tend to be the one that works most consistently.

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