/*
        A "Reservation Date" example using two datePickers
        --------------------------------------------------

        * Functionality
        
        1. When the page loads:
                - We clear the value of the two inputs (to clear any values cached by the browser)
                - We set "onchange" event handler on the startDate input to call the setReservationDates function
        2. When a start date is selected
                - We set the low range of the endDate datePicker to be the start date the user has just selected
                - If the endDate input already has a date stipulated and the date falls before the new start date then we clear the input's value
                
        * Caveats (aren't there always)

        - This demo has been written for dates that have NOT been split across three inputs
        
*/

function makeTwoChars(inp) {
        return String(inp).length < 2 ? "0" + inp : inp;
}

function initialiseInputs() {
        
        // Add the onchange event handler to the start date input
        document.getElementById("datedebut1").onchange = setReservationDates;
        document.getElementById("datedebut2").onchange = setReservationDates;
        document.getElementById("datedebut3").onchange = setReservationDates;
}
function setReservationDates(e) {
		datedeb = this.getAttribute('id');
		datefin = this.getAttribute('id').replace("datedebut", "datefin");
		// Check the associated datePicker object is available (be safe)
        if(!(datedeb in datePickerController.datePickers)) {
                return;
        }
        
        // Check the value of the input is a date of the correct format
        var dt = datePickerController.dateFormat(this.value, datePickerController.datePickers[datedeb].format.charAt(0) == "m");
        
        // If the input's value cannot be parsed as a valid date then return
        if(dt == 0) return;

        // Grab the value set within the endDate input and parse it using the dateFormat method
        // N.B: The second parameter to the dateFormat function, if TRUE, tells the function to favour the m-d-y date format
        var edv = datePickerController.dateFormat(document.getElementById(datefin).value, datePickerController.datePickers[datefin].format.charAt(0) == "m");

        // Grab the end date datePicker Objects
        var ed = datePickerController.datePickers[datefin];

        ed.setRangeLow( dt );
        
        // If theres a value already present within the end date input and it's smaller than the start date
        // then clear the end date value
        if(edv < dt) {
                document.getElementById(datefin).value = "";
        }
}

datePickerController.addEvent(window, 'load', initialiseInputs);