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HTML

              
                
<header>
    <nav>
        <span><a href="index.html"></a></span>
    </nav>
</header>

<main>

    <div class="container">
        <h3> Formulaire de réservation de vols </h3><br>
        <form id="flightResa" method="POST" onsubmit="return searchFlights(flightResa)">
            <div class="flex">
                <label for="flightFrom">Aéroport de départ : </label>
                <input type="text" name="depart" id="autocomplete-airport-1" class="flight" required
                    onchange="checkDistance(this)">
                <label for="flightTo">Aéroport d'arrivée : </label>
                <input type="text" name="arrivee" id="autocomplete-airport-2" class="flight" required
                    onchange="checkDistance(this)">
                <strong id="distance" class="">...</strong>
                <strong>Km</strong>
            </div>
            <div class="flex">
                <label for="depart">Date de départ : </label>
                <input type="date" name="date" id="depart" class="flight" placeholder="JJ/MM/AAAA" max="2025-12-31"
                    required>
                <label for="retour">Date de retour : </label>
                <input type="date" name="date" id="retour" class="flight" placeholder="JJ/MM/AAAA" required>
            </div>
            <div class="flex">
                <label for="adulte">Nombre d'adultes (12 ans et +)</label>
                <input type="number" name="passager" id="adulte" class="nbr" min="0" value="0" required>
                <label for="enfant">Nombre d'enfants (- de 12 ans)</label>
                <input type="number" name="passager" id="enfant" class="nbr" min="0" value="0" required>
            </div>
            <div class="flex">
                <label for="eco">Classe éco</label>
                <input type="radio" name="classe" id="eco" class="choixClasse" checked>
                <label for="affaire">Classe affaire</label>
                <input type="radio" name="classe" id="affaire" class="choixClasse">
                <label for="premiere">Première classe</label>
                <input type="radio" name="classe" id="premiere" class="choixClasse">
            </div>
            <div class="flex" id="divSearch">
                <input type="submit" value="Rechercher" class="flight" id="search">
            </div>
            <div class="reset">
                <input type="reset" value="Effacer" class="flight" id="reset">
            </div>
        </form>
    </div>

    <div class="container" id="hide">

        <form action="" method="post">
            <div class="flex">
                <label for="recap" class="recap">Récapitulatif du vol et des coûts</label>

            </div>
            <div class="flex">
                <textarea name="Récapitulatif" class="recap" id="recap" cols="100" rows="10" disabled>

                    </textarea>
            </div>
        </form>

    </div>



</main>

<footer>


    <p>© 2019 Mathieu François</p>

<script src="https://cdn.jsdelivr.net/npm/airport-autocomplete-js@latest/dist/index.browser.min.js"></script>
    <script>
        AirportInput("autocomplete-airport-1");
        var options = {
            formatting: `<div class="$(unique-result)"
                     single-result" 
                     data-index="$(i)"> 
                   $(IATA) </div>`
        };
        AirportInput("autocomplete-airport-2", options);
        function distance(lat1, lon1, lat2, lon2) {
            var R = 6371e3; // metres
            lat1 = parseFloat(lat1)
            lat2 = parseFloat(lat2)
            lon1 = parseFloat(lon1)
            lon2 = parseFloat(lon2)
            var f1 = lat1.toRadians();
            var f2 = lat2.toRadians();
            var df = (lat2 - lat1).toRadians();
            var dl = (lon2 - lon1).toRadians();
            var a = Math.sin(df / 2) * Math.sin(df / 2) +
                Math.cos(f1) * Math.cos(f2) *
                Math.sin(dl / 2) * Math.sin(dl / 2);
            var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
            var d = R * c;
            return d;
        }
        if (typeof (Number.prototype.toRadians) === "undefined") {
            Number.prototype.toRadians = function () {
                return this * Math.PI / 180;
            }
        }
        function checkInputData(id) {
            var realId = "autocomplete-airport-" + id
            return ([document.getElementById(realId).getAttribute("data-lat"), document.getElementById(realId).getAttribute(
                "data-lon")])
        }
        function checkDistance(self) {
            console.log("Input changed: " + self["id"])
            setTimeout(function () {
                console.log(self.getAttribute("data-lon"))
                var idChanged = self["id"].slice(-1)
                console.log(checkInputData(1))
                console.log(checkInputData(2))
                if (checkInputData(1)[0] && checkInputData(2)[0]) {
                    var dst = distance(...checkInputData(1), ...
                        checkInputData(2)) / 1000;
                    document.getElementById("distance").innerHTML = parseInt(dst);
                }
            }, 200)
        }
    </script>
</footer>
              
            
!

CSS

              
                /* ===================================
		General
==================================== */
* {
	box-sizing: border-box;
  font-family: 'Open Sans', sans-serif;
}

body {
	margin: 0;
  background-color: #ffffff;
}

a {
	text-decoration: none;
}

p,
ul li,
ol li {
	font-size: 18px;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Russo One', sans-serif;
}



/* ===================================
		Navigation bar
==================================== */
nav {
	background-color: #ffffff;
	display: flex;
	flex-flow: row nowrap;
	height: 100px;
  top: 0;
  position: fixed;
	width: 100%;
  border-bottom: 5px solid #0190b8;
}

nav span {
	color: #0190b8;
	height: 100%;
	font-size: 40px;
	line-height: 100px;
	padding-left: 40px;
	width: 60%;
}

nav span a {
	color: #0190b8;
}

img {
	height: 90%;
	width: 280px;
}

/* ===================================
		Main
==================================== */
main {
  margin-top: 130px;
}

h3 {
	color: #0190b8;
	font-size: 40px;
	text-align: center;
	margin: 15px;
}

.container {
	margin: 0 auto;
	width: 90%;
	box-shadow: 3px 5px 10px #0190b8;
}

.flex {
		display: flex;
		justify-content: space-evenly;
		margin-bottom: 30px;
}

.flexPaypal {
	display: flex;
	justify-content: center;
}

.reset {
	margin-left: 20px;
}

.flight {
	width: 200px;
	height: 30px;
	border-radius: 10px 3px;
	margin-bottom: 50px;
}

.nbr {
	width: 60px;
	height: 30px;
	border-radius: 15px 3px;
	margin-bottom: 50px;
}

.choixClasse {
	border-radius: 15px 3px;
	margin-bottom: 50px;
}

#search {
	background-color: rgb(0, 140, 255);
	color: #ffffff;
	width: 400px;
	height: 50px;
	margin-bottom: 1px;
	font-size: 25px;

}

#divSearch {
	margin-bottom: 2px;
}

.recap {
	margin-top: 10px;
	margin-bottom: 20px;
}

#recap {
	font-size: 15px;
}
/* ===================================
		Footer
==================================== */
p {
	text-align: center;
}
              
            
!

JS

              
                //==================================On Open==============================
document.getElementById("recap").innerHTML = "Voici un récapitulatif de votre dernière commande : " + localStorage.getItem("recapStore");
var date = new Date();
var day = date.getDate();
var dayReturn = date.getDate() + 1;
var month = date.getMonth() + 1;
var year = date.getFullYear();

var input1 = "";
var startDateEntered = "";
 
document.getElementById("depart").min = year + "-0" + month + "-" + day;
document.getElementById("retour").min = year + "-0" + month + "-" + dayReturn;

document.getElementById("depart").addEventListener("change", function () {
    input1 = this.value;
    startDateEntered = new Date(input1);
    dayReturn = startDateEntered.getDate() + 1;
    month = startDateEntered.getMonth() + 1;
    year = startDateEntered.getFullYear();

    document.getElementById("retour").min = year + "-0" + month + "-" + dayReturn;
});

//=======================================================================


//==============================On submit================================
function searchFlights(form) {
    var dateDepart = new Date(document.getElementById("depart").value);
    var dateRetour = new Date(document.getElementById("retour").value);
    var distance = parseInt(document.getElementById("distance").innerHTML);
    var cout;
    var airport1 = document.getElementById("autocomplete-airport-1");
    var airport2 = document.getElementById("autocomplete-airport-2");
    var classe;

    var dateComp = dateRetour.getTime() - dateDepart.getTime();


    if (airport1.value == airport2.value) {
        alert("Les aéroports doivent être différents");
        return false;
    } else {

        if (form.adulte.value == 1 && form.enfant.value > 3) {
            alert("Un adulte ne peut pas voyager seul avec plus de 3 enfants");
            return false;
        } else {
            if (dateRetour.getTime() < dateDepart.getTime() || dateDepart.getTime() < date.getTime()-60*60*24*1000) {
                alert("La date de retour ne peut pas être égale ou inférieure à la date de départ qui ne peut être inférieure à la date du jour");
                return false;
            } else {
                if (dateComp < 60 * 60 * 24 * 7 * 1000) {
                    if (distance < 3000) {
                        cout = form.adulte.value * 249 + form.enfant.value * 188;
                    } else {
                        cout = form.adulte.value * 350 + form.enfant.value * 270;
                    }
                } else {
                    if (distance < 3000) {
                        cout = form.adulte.value * 550 + form.enfant.value * 470;
                    } else {
                        cout = form.adulte.value * 680 + form.enfant.value * 600;
                    }
                }
                if (form.eco.checked) {
                    cout = cout;
                    classe = "classe éconimique";
                } else if (form.affaire.checked) {
                    cout = cout * 1.3;
                    classe = "classe affaire";
                } else {
                    cout = cout * 1.7;
                    classe = "première classe";
                }


                var recap = "\nUn vol aller-retour de " + airport1.value + " à " + airport2.value + " pour " + form.adulte.value + " adulte(s) et " + form.enfant.value + " enfant(s) en " + classe + "\nDu " + document.getElementById("depart").value + " au " + document.getElementById("retour").value + " \nPour un total de " + cout + " euros \n \nBon voyage !"
                var recapHTML = "Voici un récapitulatif de votre commande : <br>Un vol aller-retour de " + airport1.value + " à " + airport2.value + " pour " + form.adulte.value + " adulte(s) et " + form.enfant.value + " enfant(s) <br>Du " + document.getElementById("depart").value + " au " + document.getElementById("retour").value + " <br>Pour un total de " + cout + " euros <br> <br>Bon voyage !"
                alert("Voici un récapitulatif de votre commande : " + recap);
                document.getElementById("recap").innerHTML = "Voici un récapitulatif de votre commande : " + recap;
                localStorage.setItem("recapStore", recap);
                localStorage.setItem("prix", cout);
            }
        }

    }
}
              
            
!
999px

Console