Jquery UI Date Picker... only allow Fridays?

I want to only allow users to select Friday开发者_JS百科s. Basically they are choosing the start date for a schedule, and the schedules always must start on a Friday.

I am not really concerned with whether the other days are displayed or not as long as if they are displayed, then they are disabled.

You can use the beforeShowDate option, like this:

​$("#datepicker").datepicker({
    beforeShowDay: function(date) {
        return [date.getDay() == 5];
    }
})​​​​​;​

You can try a demo here, we're just checking if the .getDay() on the date it's trying to show is 5 (Friday), and if so true is the first element in the array, false otherwise, which disables the date in the picker.