PhotoGallery/Queue.html at master · likejean/PhotoGallery · GitHub

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<!DOCTYPE html>
<html lang="en">
   <head>
        <title>My Music List</title>
        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
        <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
        <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
        <link href="http://localhost:8082/Styling.css">
        <link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <meta charset="UTF-8">
        <style>
        img {
            border: 5px solid #ddd;
            border-radius: 25px;
            padding: 25px;
            width: 250px;
        }
        </style>
    </head>

    <body>
        <div class = "input">
            <form class = "w3-container">
                <input class ="w3-input w3-animate-input" id = "photo name" type = "text" name = "Photo Name" value="Insert Photo Name" style = "width: 250px"><br>
                <input class ="w3-input w3-animate-input" id = "file" type = "text" name = "filename" style = "width: 250px"><br>
            </form>
        </div>
        <div class = "button">
            <button class = "w3-button w3-white" id = "onload" onclick = "readSingleFile(e)">Onload</button></br></br>
            <button class = "w3-button w3-teal" id = "add" onclick = "Addition()">Add</button><br><br>
            <button class = "w3-button w3-red" id = "remove" onclick = "Removal()">Remove</button>
        </div>
        <div class="image">
            <div>
                <button class="w3-button w3-light-grey" id = "prev" onclick = "Previous()">Previous &laquo;</button>
            </div>
            <div>
                <h2></h2>
                <p></p>
                <img id = "img" src = "" class = "rounded" alt="Honda EX">
            </div><br>
            <div>
                <button class="w3-button w3-green" id = "next" onclick="Next()">Next &raquo;</button>
            </div>
        </div>
    </body>
</html>


<script type="text/javascript">

    function Addition(){
        let a = document.getElementById("add");
        let event = List.enqueue(document.getElementById("photo name").value);
        a.addEventListener("click", event, false);

    }

    function Removal(){
        document.getElementById("remove").addEventListener("click", List.dequeue());
        console.log(List);
    }


    function Previous(){
        let a = document.getElementById("prev");
        let event = List.forward();
        a.addEventListener("click", event, false);
    }


    function Next(){
        let a = document.getElementById("next");
        let event = List.backward();
        a.addEventListener("click", event, false);
    }


    function DLNode(value){
        this.value = value;
        this.index = null;
        this.next = null;
        this.prev = null;
        this.visible = null;
    };

    function DLQueue(){
        this.head = null; //front of the list - add property parameter
        this.tail = null; //back of the list - add property parameter;\
        this._size = 0;
    };

    DLQueue.prototype.IsEmpty = function(){
        if (!this.head || !this.tail){
            return true;
        }
        return false;
    };

    DLQueue.prototype.dequeue = function(){
        let temp = this.tail;
        if (List.IsEmpty()){
            throw "The List is Empty!";
            return false;
        }
        else if(this.head == this.tail){
            this.head = null;
            this.tail = null;
            this._size--;
            document.getElementById("img").src = "";
            document.getElementsByTagName("H2")[0].innerHTML = "No Photos Left";
        }
        else if(this._size == 2){
            this.head.next = this.tail;
            this.tail.prev = this.head;
            this._size--;
        }
        else{
            this.tail = temp.prev;
            temp.prev = null;
            this.tail.next = this.head;
            this.head.prev = this.tail;

            this._size--;
        }
        return this;
    };

    DLQueue.prototype.enqueue = function(val){
        let NewNode = new DLNode(val);
        if(List.IsEmpty()){
            this.tail = NewNode;
            this.head = NewNode;
            this.visible = NewNode;
            this._size++;
            this.head.index = this._size;
            document.getElementById("img").src = val;
            document.getElementsByTagName("H2")[0].innerHTML = "Photo #" + this.head.index;
            return NewNode;
        }
        else if (this._size == 1) {
            let temp = this.head;
            this.head = NewNode;
            this.visible = NewNode;
            NewNode.next = temp;
            temp.prev = NewNode;
            this._size++;
            NewNode.index = this._size;
            document.getElementById("img").src = val;
            document.getElementsByTagName("H2")[0].innerHTML = "Photo #" + NewNode.index;
        }
        else {
            let temp = this.head;
            this.head = NewNode;
            this.visible = NewNode;
            NewNode.next = temp;
            temp.prev = NewNode;
            this.head.prev = this.tail;
            this.tail.next = this.head;
            this._size++;
            NewNode.index = this._size;
            document.getElementById("img").src = val;
            document.getElementsByTagName("H2")[0].innerHTML = "Photo #" + NewNode.index;
        }
        return NewNode;
    };


    DLQueue.prototype.forward = function(){
        if (this._size == 0){
            throw "This list is empty!!!"
            return false;
        }
        else if (this._size == 1){
            throw "There is only one picture!"
            return false;
        }
        else {
            List.fwd_runner(this.visible);
        }
    };

    DLQueue.prototype.fwd_runner = function(curr){
        curr = curr.next;
        this.visible = curr;
        console.log(this.visible);
        document.getElementById("img").src = curr.value;
        document.getElementsByTagName("H2")[0].innerHTML = "Photo #" + curr.index;
        return curr;
    }

    DLQueue.prototype.backward = function(){
        if (this._size == 0){
            throw "This list is empty!!!"
            return false;
        }
        else if (this._size == 1){
            throw "There is only one picture!"
            return false;
        }
        else {
            List.bck_runner(this.visible);
        }
    };

    DLQueue.prototype.bck_runner = function(curr){
        curr = curr.prev;
        this.visible = curr;
        console.log(this.visible);
        document.getElementById("img").src = curr.value;
        document.getElementsByTagName("H2")[0].innerHTML = "Photo #" + curr.index;
        return curr;
    }


    var List = new DLQueue();
</script>