Sharepoint multiple lines of text column validation using JQuery

This post will help us on below validations:

1. Required field validation
2. clear the multiline of text value

//Get the multiline of text value
var multilineoftext = RTE_GetRichEditTextOnly("<%= txtComments.ClientID %>");

if (multilineoftext == '') {

alert("Multiline of text value is required");

}

//To clear multi line of text value

RTE_GetEditorDocument("<%=txtComments.ClientID %>").body.innerText = "";