I am posting a wonderful post on Jquery datepicker.
Because I am using Jquery in ASP.NET application, I added a regular expression for date to validate whether user entered date is valid or not. Because of adding the validation on the text box, whenever I select a date from datepicker, the datepicker events are firing like onselect, change etc.. So, generally what validation framework is doing, whenever some event fires on the page, validations will execute. The same thing happening here. Whenever I change or select date from the date picker, it will fire some events and at the same time validation framework trying to validate the validations. But, it is not the right event to do validations. So, always we will get the exception at “vals.length” in a for loop of the built-in code. vals is the object of all the validators on the page. It always fails to load in Jquery date picker event trigger, because it is not the right event for validation. And the result is vals is undefined, you always get exception at vals.length as “length is null or not an object”. I think now you got very clear idea of why it is happening. Now, move to the next step i.e. solution for it.
Solution is very simple, I read all the documentation of Jquery datepicker and found an event named onSelect. So, whenever I select date this is the event firing. So, there I got a clue and started thinking towards it. And below is the result.
In your datepicker initialization statement add onSelect event which don’t do anything means empty function as shown above. There problem solved. Isn’t a good find? Please let me know your thoughts on this.
Ref : praveenbattula