Question

I would like to know, how can we validate the data, we can not get the data more than 20 lines using Textarea. we just want to validate the textarea with the help of Jquery.
Please suggest me, the proper way for validating the values.

Answer 1

Something like this, which has a maximum number of rows = 3

$("textarea").keydown(function(e){
   var rows = $(this).val().split("\n").length;
   if( e.which == 13 && rows == 3 )
   {
        alert( "TO MANY ROWS");
        return false;
   }
});

This does not check if there are to many characters in the textarea to see if there are more new rules then just enters used.

Live example: http://jsfiddle.net/hXjtv/

To call it as a function

function checkTextareaLength()
{
   var rows = $("textarea").val().split("\n").length;
   if( rows > 3 )
   {
        alert( "TO MANY ROWS");
        return false;
   }
}

The onsubmit will be something `onsubmit=”checkTextareaLength();”