Adding event listener on 'Today' button in jquery-ui datapicker

Question

I'm using the datepicker form jQuery-ui-1.8.16.

I have the following code:

Site.Calendar = function() {

    // Set default setting for all calendars
    jQuery.datepicker.setDefaults({
        showOn : 'both',
        buttonImageOnly : true,
        buttonText: '',
        changeMonth : true,
        changeYear : true,
        showOtherMonths : true,
        selectOtherMonths : true,
        showButtonPanel : true,
        dateFormat : "D, d M, yy",
        showAnim : "slideDown",
        onSelect: Site.Calendar.customiseTodayButton
    });
};

Site.Calendar.customiseTodayButton = function(dateText, inst) {
    console.log("hello");
};

My customiseTodayButton function is only getting triggered when I select an actual date and NOT on the Today button.

Is there any way to override how the today button work's in the jQuery datepicker?

Thanks

Answer 1

I found the following posted here: Today button in jQuery Datepicker doesn't work

jQuery.datepicker._gotoToday = function(id) {
        var target = jQuery(id);
        var inst = this._getInst(target[0]);
        if (this._get(inst, 'gotoCurrent') && inst.currentDay) {
                inst.selectedDay = inst.currentDay;
                inst.drawMonth = inst.selectedMonth = inst.currentMonth;
                inst.drawYear = inst.selectedYear = inst.currentYear;
        }
        else {
                var date = new Date();
                inst.selectedDay = date.getDate();
                inst.drawMonth = inst.selectedMonth = date.getMonth();
                inst.drawYear = inst.selectedYear = date.getFullYear();
                this._setDateDatepicker(target, date);
                this._selectDate(id, this._getDateDatepicker(target));
        }
        this._notifyChange(inst);
        this._adjustDate(target);
    }

It simply rewrites the goToToday method and adds two new lines:

this._setDateDatepicker(target, date);
this._selectDate(id, this._getDateDatepicker(target));

Maybe there is a cleaner way to fix this with your original answer Mark?

Answer 2

There isn't a standard event for when the today button is clicked. However, taking a look at the jquery.ui.datepicker.js code, it appears that it calls $.datepicker._gotoToday. I'll assume by customizeTodayButton you're attempting to change the behavior of what it does currently (not the looks, the looks would be done with styling). To change the existing behavior, it's good to know what it does now. So, that in mind, this is the current code of the function used:

/* Action for current link. */
_gotoToday: function(id) {
    var target = $(id);
    var inst = this._getInst(target[0]);
    if (this._get(inst, 'gotoCurrent') && inst.currentDay) {
        inst.selectedDay = inst.currentDay;
        inst.drawMonth = inst.selectedMonth = inst.currentMonth;
        inst.drawYear = inst.selectedYear = inst.currentYear;
    }
    else {
        var date = new Date();
        inst.selectedDay = date.getDate();
        inst.drawMonth = inst.selectedMonth = date.getMonth();
        inst.drawYear = inst.selectedYear = date.getFullYear();
    }
    this._notifyChange(inst);
    this._adjustDate(target);
},

To override this function with your own functionality, you'll want to do update your code to something like this:

Site.Calendar = function() {
    //override the existing _goToToday functionality
    $.datepicker._gotoTodayOriginal = $.datepicker._gotoToday;
    $.datepicker._gotoToday = function(id) {
        // now, call the original handler
        $.datepicker._gotoTodayOriginal.apply(this, [id]);
        // invoke selectDate to select the current date and close datepicker.
        $.datepicker._selectDate.apply(this, [id]);
    };

    // Set default setting for all calendars
    jQuery.datepicker.setDefaults({
        showOn: 'both',
        buttonImageOnly: true,
        buttonText: '',
        changeMonth: true,
        changeYear: true,
        showOtherMonths: true,
        selectOtherMonths: true,
        showButtonPanel: true,
        dateFormat: "D, d M, yy",
        showAnim: "slideDown"
    });
};

Also, here's a working jsFiddle of what you're looking for.