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KO Custom Component

custome_component.html


<!DOCTYPE html>
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and open the template in the editor.—>
<html>
    <head>
        <title>TODO supply a title</title>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <style>

            .main{
                margin: 0 auto;
                width: 435px; 
            }

            .inputbg{
                background: #ff33ff;
            }

            .header{
                background: bisque;
                margin: 0 auto;
                width: 435px;
                padding: 5px;
            }

            .content{
                padding: 5px;
                background: #99ffff;
                width: 435px;

            }

            input{
                height: 40px;
                text-align: center;
                font-size: 18px;

            }

            .input-small{
                width: 100px;
                text-align: center;

            }

            button{
                height: 38px;
                margin-left: 5px;
            }
        </style>
        <script src="js/knockout-3.3.0.js"></script>
        <script src="js/jquery-2.1.4.min.js"></script>
    </head>
    <body>
        <div class="main">
            <div class="header">
                <input type="text" placeholder="Item Name" data-bind="value:itemName"><input type="text" placeholder="Price" data-bind="value:itemPrice"><button data-bind="click:addItem">Add</button>
            </div>

            <div class="content" data-bind="foreach:itemsArray">
                <item-box params="itemId:item_id,item_name:item_name,item_qty:item_qty,item_unit_price:item_unit_price,item_total_price:item_total_price"></item-box>
            </div>
            <div class="header">

                <span data-bind="text:total"></span>
              
            </div>
            <div class="header">

            </div>
        </div>
        
        <script type="text/html" id="itemrows">
            ‘<tr>’+
             ‘<td><span data-bind="text:item_name"></span></td>’+
                            ‘<td><input type="text" class="input-small" data-bind="textInput:item_qty,calculateTotal:{count:item_qty}"/></td>’+
                            ‘<td><span data-bind="text:item_unit_price"></span></td>’+
                             ‘<td><span data-bind="text:item_total_price"></span></td>’+
                        ‘</tr>’;
        </script>
        <script>
            
            ko.components.register(‘item-box’,{
                viewModel:function(params){
                    var self = this;
                    self.item_id = params.itemId;
                    self.item_name = params.item_name;
                    self.item_qty = params.item_qty;
                    self.item_unit_price = params.item_unit_price;
                    self.item_total_price = params.item_total_price;
                    
                    
                    
                },
                template:’<div style="width: 250; background-color: #dedede">\
    <p style="width: 100%"><span data-bind="text:item_name"></span></p>\
    <p style="width: 100%"><input type="text" class="input-small" data-bind="textInput:item_qty,calculateTotal:{count:item_qty}"/></p>\
    <p style="width: 100%"><span data-bind="text:item_unit_price"></span></p>\
    <p style="width: 100%"><span data-bind="text:item_total_price"></span></p>\
</div>’
            });

            ko.bindingHandlers.calculateTotal = {
                init: function (element, valueAccessor, allBindings, viewModel, bindingContext) {
                    // This will be called when the binding is first applied to an element
                    // Set up any initial state, event handlers, etc. here
                    //console.log(valueAccessor().some);
                    //console.log(valueAccessor());
                },
                update: function (element, valueAccessor, allBindings, viewModel, bindingContext) {
                    // This will be called once when the binding is first applied to an element,
                    // and again whenever any observables/computeds that are accessed change
                    // Update the DOM element based on the supplied values here.
                    if (valueAccessor().count === "0") {
                        $(element).filter(‘input’).addClass(‘inputbg’);
                    } else {
                        $(element).filter(‘input’).removeClass(‘inputbg’);
                    }
                    console.log(bindingContext.$root.itemsArray());
                    var itemsArray = bindingContext.$root.itemsArray();
                    var total = 0;
                    for(var index in itemsArray){
                        total = total+parseInt(itemsArray[index].item_total_price());
                    }
                    
                    bindingContext.$root.total(total);

                }
            };
            var Item = function (itemId, itemName, itemQty, itemPrice) {
                var self = this;
                self.item_id = itemId;
                self.item_name = ko.observable(itemName);
                self.item_qty = ko.observable(itemQty);
                self.item_unit_price = ko.observable(itemPrice);
                self.item_total_price = ko.computed(function () {
                    return parseInt(self.item_qty()) * (self.item_unit_price());
                });
            }

            var ViewModel = function () {
                var self = this;

                self.itemName = ko.observable();
                self.itemPrice = ko.observable();
                self.itemQty = ko.observable(1);
                self.itemsArray = ko.observableArray();
                self.total = ko.observable(0);
                self.selectedOptionValue = ko.observable();
                
                self.selectedOptionValue.subscribe(function(newvalue){
                    console.log(newvalue);
                });
                self.addItem = function () {

                    var item = new Item(-1, self.itemName(), self.itemQty(), self.itemPrice());

                    self.itemsArray.push(item);
                    self.itemName("");
                    self.itemPrice("");
                };

                self.save = function () {
                    //console.log(JSON.stringify(ko.toJS((self.itemsArray()))));
                    
                };
                
                

            };
            
            var vm = new ViewModel();
            ko.applyBindings(vm);
        </script>
    </body>
</html>

HTML5

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