After max characters per line in textarea, text in next line

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I have a Radtextbox. I have implemented the maximum characters per line and limit in number of lines.

But I need your help that, after the maximum character limit per line text should go to next line.

For Example:

My Character per line is 10, if I entered 11 character it should go to next line instead of alert.

Code:

function ValidationAddress() {

var allText;

allText = document.getElementById("<%= txtAdd1.ClientID %>").value;

allText = document.getElementById('<%=txtAdd1.ClientID%>').value;

var A = allText.split('\n');

var L = A.length;

if (L > 3 && event.keyCode != 8 && event.keyCode != 46) {

alert("You have exceeded maximum limit.Cannot insert more than 3 lines.");

valert = false;

return false;

}

var arr = allText.split("\n");

for (var i = 0; i < arr.length; i++) {

if (arr[i].length > 10) {

alert("You have exceeded the Maximum Limit..Characters per line is 70 in Address Field !");

valert = false;

return false;

}