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HTML 

              
                <link href='https://fonts.googleapis.com/css?family=Montserrat' rel='stylesheet' type='text/css'>
<h1>Puter Parts</h1>
  		<form>
    		<div class="search">
        		<input type="text" v-model="searchString" placeholder="Search" />
    		</div>
    	</form>
    	<button id="GPU" class="categories" @click="selectCategory('Graphics Card')">Graphics Cards</button>
    	<button id="CPU" class="categories" @click="selectCategory('Processor')">Processors</button>
    	<button id="Mobo" class="categories" @click="selectCategory('Motherboard')">Motherboards</button>
    	<div id="products">
    		<ul>
        		<li v-for="i in products | searchFor searchString | filterBy selectedCategory in 'category'">
            		<img v-bind:src="i.image" />
            		<p>{{i.product}}</p>
            		<p>£{{i.price}}
            			<select v-model="quantity[i.id].quantity" number>
            				<option selected>1</option>
            				<option>2</option>
            				<option>3</option>
            				<option>4</option>
            				<option>5</option>
            			</select>
            			<button id="GPU" class="categories" @click="addToCart(i.id)">Add To Cart</button>
            		</p>
        		</li>
    		</ul>
    	</div>
    
    	<div id="cart" v-show="shoppingCart.length > 0">
    		<h2>Shopping Cart</h2>
    		<ul>
    			<li v-for="i in shoppingCart">
    				<p id="cartQuan">{{i.quantity}} X {{i.name}}</p>
    				<p id="cartPrice">{{i.price}} <button @click="removeFromCart(i, i.productId)">X</button></p>
    			</li>
    			<li>Total: £{{ totalPrice }}</li>
    		</ul>
    	</div>

  		<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/1.0.21/vue.js"></script>
  		<script src="https://cdn.jsdelivr.net/lodash/4.11.2/lodash.min.js"></script>
!

CSS 

              
                body{
    font:15px/1.3 'Open Sans', sans-serif;
    color: #5e5b64;
    text-align:center;
}

section, footer, header, aside, nav{
    display: block;
}

h1{
    font-family: 'Montserrat', sans-serif;
    font-size: 40px;
    margin-bottom: 10px;
}

.search{
    background-color:#5c9bb7;

    background-image:-webkit-linear-gradient(top, #5c9bb7, #5392ad);
    background-image:-moz-linear-gradient(top, #5c9bb7, #5392ad);
    background-image:linear-gradient(top, #5c9bb7, #5392ad);

    box-shadow: 0 1px 1px #ccc;
    border-radius: 2px;
    width: 400px;
    padding: 14px;
    margin: 45px auto 20px;
    margin-top: 20px;
    position:relative;
}

.search input{
    background:#fff no-repeat 13px 13px;
    background-image:url(data:image/png;base64,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);

    border: none;
    width: 100%;
    line-height: 19px;
    padding: 11px 0;

    border-radius: 2px;
    box-shadow: 0 2px 8px #c4c4c4 inset;
    text-align: left;
    font-size: 14px;
    font-family: inherit;
    color: #738289;
    font-weight: bold;
    outline: none;
    text-indent: 40px;
}

#products ul{
    list-style: none;
    width: 500px;
    margin: 0 auto;
    text-align: left;
}

ul li{
    border-bottom: 1px solid #ddd;
    padding: 10px;
    overflow: hidden;
}

ul li img{
    float:left;
    border:none;
    margin-right: 15px;
}

#products ul li p{
    margin-left: 75px;
    font-weight: bold;
    padding-top: 5px;
    color:#6e7a7f;
}

.categories {
    -moz-box-shadow:inset 0px 1px 0px 0px #97c4fe;
    -webkit-box-shadow:inset 0px 1px 0px 0px #97c4fe;
    box-shadow:inset 0px 1px 0px 0px #97c4fe;
    background:-webkit-gradient(linear, left top, left bottom, color-stop(0.05, #3d94f6), color-stop(1, #1e62d0));
    background:-moz-linear-gradient(top, #3d94f6 5%, #1e62d0 100%);
    background:-webkit-linear-gradient(top, #3d94f6 5%, #1e62d0 100%);
    background:-o-linear-gradient(top, #3d94f6 5%, #1e62d0 100%);
    background:-ms-linear-gradient(top, #3d94f6 5%, #1e62d0 100%);
    background:linear-gradient(to bottom, #3d94f6 5%, #1e62d0 100%);
    filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#3d94f6', endColorstr='#1e62d0',GradientType=0);
    background-color:#3d94f6;
    -moz-border-radius:6px;
    -webkit-border-radius:6px;
    border-radius:6px;
    border:1px solid #337fed;
    display:inline-block;
    cursor:pointer;
    color:#ffffff;
    font-family:Arial;
    font-size:15px;
    font-weight:bold;
    padding:6px 24px;
    text-decoration:none;
    text-shadow:0px 1px 0px #1570cd;
}
.categories:hover {
    background:-webkit-gradient(linear, left top, left bottom, color-stop(0.05, #1e62d0), color-stop(1, #3d94f6));
    background:-moz-linear-gradient(top, #1e62d0 5%, #3d94f6 100%);
    background:-webkit-linear-gradient(top, #1e62d0 5%, #3d94f6 100%);
    background:-o-linear-gradient(top, #1e62d0 5%, #3d94f6 100%);
    background:-ms-linear-gradient(top, #1e62d0 5%, #3d94f6 100%);
    background:linear-gradient(to bottom, #1e62d0 5%, #3d94f6 100%);
    filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#1e62d0', endColorstr='#3d94f6',GradientType=0);
    background-color:#1e62d0;
}
.categories:active {
    position:relative;
    top:1px;
}

.selected {
    -moz-box-shadow:inset 0px 1px 0px 0px #3dc21b;
    -webkit-box-shadow:inset 0px 1px 0px 0px #3dc21b;
    box-shadow:inset 0px 1px 0px 0px #3dc21b;
    background-color:#32ad1f;
    -moz-border-radius:6px;
    -webkit-border-radius:6px;
    border-radius:6px;
    border:1px solid #18ab29;
    display:inline-block;
    cursor:pointer;
    color:#ffffff;
    font-family:Arial;
    font-size:15px;
    font-weight:bold;
    padding:6px 24px;
    text-decoration:none;
    text-shadow:0px 1px 0px #2f6627;
}
.selected:hover {
    background-color:#30ad4d;
}
.selected:active {
    position:relative;
    top:1px;
}

#cart {
    position: fixed;
    right: 300px;
    top: 0px;
    width: 400px;
}
#cartName {
    width: 200px;
}
#cartName ul li p {
    margin-left: 0px;
    font-weight: normal;
    padding-top: 0px;
}
!

JS 

              
                Vue.filter('searchFor', function (value, searchString) {
    var result = [];
    if(!searchString){
        return value;
    }

    searchString = searchString.trim().toLowerCase();

    result = value.filter(function(item){
        if(item.product.toLowerCase().indexOf(searchString) !== -1){
            return item;
        }
    })
        return result;
})
    
new Vue({
    el: 'body',
    data: {
        searchString: "",
        selectedCategory: "",
        shoppingCart: [],

        quantity: [
            { "id": "0", "quantity": 1 }, { "id": "1", "quantity": 1 },
            { "id": "2", "quantity": 1 }, { "id": "3", "quantity": 1 },
            { "id": "4", "quantity": 1 }, { "id": "5", "quantity": 1 },
            { "id": "6", "quantity": 1 }, { "id": "7", "quantity": 1 },
            { "id": "8", "quantity": 1 }, { "id": "9", "quantity": 1 }
        ],

        products: [
            {
                "id": "0",
                "product": "Asus GeForce GTX 980Ti DS3 Strix",
                "price": 559.99,
                "category": "Graphics Card",
                "image": "https://www.overclockers.co.uk/media/image/thumbnail/GX388AS_119199_105x105.jpg",
                "inCart": false
            },
            {
                "id": "1",
                "product": "EVGA GeForce GTX 980Ti Superclocked ACX 2.0+",
                "price": 559.99,
                "category": "Graphics Card",
                "image": "https://www.overclockers.co.uk/media/image/thumbnail/GX288EA_112617_105x105.jpg",
                "inCart": false
            },
            {
                "id": "2",
                "product": "Asus Radeon R9390X DS3 OC Strix",
                "price": 329.99,
                "category": "Graphics Card",
                "image": "https://www.overclockers.co.uk/media/image/thumbnail/GX373AS_117053_105x105.jpg",
                "inCart": false
            },
            {
                "id": "3",
                "product": "Sapphire Radeon R9390X Nitro",
                "price": 349.99,
                "category": "Graphics Card",
                "image": "https://www.overclockers.co.uk/media/image/thumbnail/GX376SP_121594_105x105.jpg",
                "inCart": false
            },
            {
                "id": "4",
                "product": "Intel Core i7-6700K 4.0GHz (Skylake)",
                "price": 289.99,
                "category": "Processor",
                "image": "https://www.overclockers.co.uk/media/image/thumbnail/CP581IN_114995_105x105.jpg",
                "inCart": false
            },
            {
                "id": "5",
                "product": "Intel Core i5-6600K 3.9GHz (Skylake)",
                "price": 197.99,
                "category": "Processor",
                "image": "https://www.overclockers.co.uk/media/image/thumbnail/CP579IN_114994_105x105.jpg",
                "inCart": false
            },
            {
                "id": "6",
                "product": "AMD Piledriver FX-8 9590 Black Edition 4.70GHz (5.00GHz Turbo)",
                "price": 161.99,
                "category": "Processor",
                "image": "https://www.overclockers.co.uk/media/image/thumbnail/CP336AM_60876_105x105.jpg",
                "inCart": false
            },
            {
                "id": "7",
                "product": "AMD Piledriver FX-8 8350 Black Edition 4.00GHz",
                "price": 139.99,
                "category": "Processor",
                "image": "https://www.overclockers.co.uk/media/image/thumbnail/CP336AM_60876_105x105.jpg",
                "inCart": false
            },
            {
                "id": "8",
                "product": "Asus Maximus VIII Hero Intel Z170 (Socket 1151) ATX Motherboard",
                "price": 176.99,
                "category": "Motherboard",
                "image": "https://www.overclockers.co.uk/media/image/thumbnail/MB651AS_114892_105x105.jpg",
                "inCart": false
            },
            {
                "id": "9",
                "product": "Asus Crosshair V Formula Z AMD 990FX (Socket AM3+) Motherboard",
                "price": 184.99,
                "category": "Motherboard",
                "image": "https://www.overclockers.co.uk/media/image/thumbnail/MB554AS_83151_105x105.jpg",
                "inCart": false
            }
        ]
    },

    computed: {
        totalPrice: function() {
            var total = 0
            this.shoppingCart.forEach(function(item) {
                total += item.price * item.quantity
            })

            return total
        }
    },

    methods: {
        selectCategory: function(category) {
        	if(category == "Graphics Card"){
        		var button = 'GPU'
        		document.getElementById(button).className = "selected"
        		document.getElementById('CPU').className = "categories"
        		document.getElementById('Mobo').className = "categories"
        	}
        	else if(category == "Processor"){
        		var button = 'CPU'
        		document.getElementById(button).className = "selected"
        		document.getElementById('GPU').className = "categories"
        		document.getElementById('Mobo').className = "categories"
        	}
        	else{
        		var button = 'Mobo'
        		document.getElementById(button).className = "selected"
        		document.getElementById('GPU').className = "categories"
        		document.getElementById('CPU').className = "categories"
        	}
        	if(this.selectedCategory !== category){
        		this.selectedCategory = category
        	}
        	else{
        		this.selectedCategory = ""
        		document.getElementById(button).className = "categories"
        	}
        },

        addToCart: function(id) {
            var id = id
            var index = this.shoppingCart.length

            if(this.products[id].inCart == false) {
                this.products[id].inCart = true
                this.shoppingCart.$set(index, { 
                productId: id,
                quantity: this.quantity[id].quantity,
                name: this.products[id].product,
                price: this.products[id].price,
                })
            }
            else {
                product = _.find(this.shoppingCart, ['productId', id])
                product.quantity = product.quantity + this.quantity[id].quantity
            }
        },

        removeFromCart: function(i, productId) {
            id = productId
            this.products[id].inCart = false
            this.shoppingCart.$remove(i)
        }
    }
});
!
999px

Console