Shift+Enter doing different function than just Enter from textarea

[eboyjr14]

I need to make it so that when you're entering data into a textarea, and press shift+enter it creates a new line where the caret is at, then when you press enter it sends a message. This is like most chat applications.

What's wrong with this code:

<textarea id="msginput" onkeypress="return onEnter(event,this.value,this);" onkeydown="chkShift(event);"></textarea>

and...

function chkShift( evt )
    {
    var key = null;
    if( evt.which )
        {
        key = evt.which;
        }
    else if( evt.keyCode )
        {
        key = evt.keyCode;
        }
    if ( key == 16 )
        {
        document.getElementById('shifter').value = "true"
        }
    else
        {
        document.getElementById('shifter').value = "false";
        }
    }
function onEnter( evt, msg, obj )
    {
    var keyCode = null;
    if( evt.which )
        {
        keyCode = evt.which;
        }
    else if( evt.keyCode )
        {
        keyCode = evt.keyCode;
        }
    if( 13 == keyCode )
        {
        if (document.getElementById('shifter').value == "true")
            {
            obj.value += "\n";
            document.getElementById('shifter').value = "false";
            }
        else
            {
            if (msg != "" && document.getElementById('titletext').innerHTML != "" )
                {
                sndMessage(msg, document.getElementById('titletext').innerHTML);
                obj.value = "";
                }
            }
            document.getElementById('shifter').value = "false";
        return false;
        }
    return true;
    }

[acoder]

Use event.shiftKey to detect the shift key.