Question

Focus is coming on validate datepicker field in jquery and it showing me opening calendar. I want only validate message not popup of datepicker.

Answer 1

A quick hack from your method:

$.validator.addMethod("endDate", function(value, element) { 

        var startDate = $('#txt_reg_form').val(), 
        ret = Date.parse(startDate) <= Date.parse(value) || value == ""; 

        if(!ret){ /*IF NOT VALID DATE*/

            /*TRY DISABLING DATEPICKER FOR A MOMENT*/
            $("#txt_reg_form").datepicker('disable');

            /*SET TIMEOUT TO ENABLE IT AFTER 1 SECOND*/
            setTimeout(function(){
                   $("#txt_reg_form").datepicker('enable');
               }, 1000);
        }
        return ret;
   }
    , "To date should be greater then From date"
);

If a datepicker is associated with a field, it will popup calender on focusing on the field. You can change the default behaviour of showing popup on focus to show it on clicking button/icon by following code:

$( "#datepicker" ).datepicker({
    showOn: "button",
    buttonImage: "images/calendar.gif",
    buttonImageOnly: true
});