Question

Can anyone please tell me what the problem is with this code:

function c(id)
{
    var empty = document.getElementById(id);
    if(empty.length<1)
    {
        window.alert ("This field cant be left empty");
        return true;
    }
    else
    {
        return false;
    }

}

This is my html code:

<textarea rows="3" cols="80" id="ta1" onChange="c('ta1');"></textarea>

Answer 1

The value property of the textarea should be checked to determine if it is empty.

   var content = document.getElementById(id).value;

   if(content.length<1)
   {
        window.alert ("This field cant be left empty");
        return true;
   }
   else
   {
        return false;
   }

Working Example: http://jsfiddle.net/35DFR/2/