[Vuejs]-In my VUE application "this" keyword does select a DOM object

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As far as I know, Vue.js doesn’t have a built-in concept of a ‘selected’ element. You may be better off by using the date returned by the day-click event to figure out what the CSS selector is, and then using that to set the background-color. See below for some untested code based on the answer to a related SO question:

click: function(date, jsEvent, view) {
    $("#red").css('background-color', 'red');

    var moment = date.toDate();
    MyDateString = moment.getFullYear() + '-'
                   + ('0' + (moment.getMonth() + 1) ).slice(-2)
                   + "-" +('0' + moment.getDate()).slice(-2);
    $('[data-date='+MyDateString+']').css({'background-color', 'red'});
}

Source: Change day number color on click – not background

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