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Javascript 'keyCode' and 'onkeypress' Browser Incosistencies

I have this Javascript funtion that checks keyboard input to verify numbers only and then sets a textbox on the page.

I have this function working fine in IE7 but in FireFox 2.x it does not work.
I get an error message in the FireFox console: "setting a property that only has a getter" and the line in question contains:
evt.keyCode = 0;

I have tried changing the Javascript function from firing at 'onkeypress' to 'onkeyup' / 'onkeydown' but it still won't work in FireFox.

function cmvFireFox(maskControl, evt) {
     var strText = maskControl.value;
      if ((evt.keyCode < 48) || (evt.keyCode > 58))
      {
            evt.keyCode = 0;
      }
      if (evt.keyCode < 58)
      {            
            //It's a number
            if(strText.length == 1)
            {
                if(parseInt(strText) > 2)
                {
                    strText = '0' + strText + ':';
                    maskControl.value = strText;
                }
                else if(parseInt(strText) == 2)
                {
                    if (evt.keyCode > 51)
                    {
                        evt.keyCode = 0;
                    }
                }
            }
            
            if(strText.length == 2)
            {
                if (strText.search(/:/) < 0)
                {
                    strText = strText + ':';
                    maskControl.value = strText;
                }
            }
            
            if(strText.length == 3)
            {
                if (evt.keyCode > 53)
                {
                    evt.keyCode = 0;
                }
            }
      }
      else
      {
            //It's a ":"
            if (strText.search(/:/)>-1)
            {
            //Only Allow one ":"
                evt.keyCode = 0;
                return;
            }
            if (strText.length < 1 || strText.length > 2)
            {
                evt.keyCode = 0;
                return;
            }
            else
            {
                if(strText.length == 1)
                {
                    maskControl.value = '0' + strText;
                }
            }
      }
}

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vibrazy

Hi,

I think its basically saying that you cannot assign a variable to a event keycode(evt.keyCode = 0;)

Why are you assigning this variable? can you replace it with var keyCodeTemp = 0;?

Regards,
Dan

svelarsen

You can use this:

var tmpKeyCode = evt.keyCode;

Then you can later use that variable instead of evt.keyCode and you can assign values to it.

ASKER CERTIFIED SOLUTION

SreejithG

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