Improve User Experience of the List and Detail Page

Localized strings are necessary to translate the application in various languages. You need to bind all exposed strings to the i18n model and avoid hard-coded strings so that the web app can be translated easily. This tutorial’s views already come with bound strings, so you only need to add the properties file.

Replace the content of the webapp/webapp/i18n/i18n.properties file with the following lines.

appTitle=Products
appDescription=Displays products


Currency=EUR
Discontinued=Discontinued
Available=Available

# List View
ListTitle=Product Overview

# Detail View
DetailTitle=Product Details
Ordered=Ordered
NotOrdered=Not Ordered
OrderButtonText=Order
OrderDialogTitle=Order Product
OrderDialogMsg=Do you want to order this product now?
OrderDialogSuccessMsg=The product has been ordered

You can use language codes to add more i18n files.

In this step, we will add a search field on the top of the list to make it searchable and more appealing by using custom list items. You will add a <SearchField> control to the initial page of the application. We’ll add it as a child within the pages subHeader aggregation, which expects a <Bar> control.

1. Open the webapp/webapp/view/List.view.xml file, and change the highlighted lines.

   <mvc:View controllerName="sap.cp.webapp.controller.List"
   	xmlns:mvc="sap.ui.core.mvc" displayBlock="true"
   	xmlns="sap.m">
   	<Page id="listPage" title="{i18n>ListTitle}">
   		<subHeader>
   			<Bar>
   				<contentLeft>
   					<SearchField search="handleSearch"/>
   				</contentLeft>
   			</Bar>
   		</subHeader>
   		<List id="list" items="{/Products}">
   			<ObjectListItem type="Navigation" press="handleListItemPress" title="{ProductName}" number="{= ((${UnitPrice} * 100) / 100).toFixed(2) }" numberUnit="{i18n>Currency}">
   				<attributes>
   					<ObjectAttribute text="{QuantityPerUnit}"/>
   				</attributes>
   				<firstStatus>
   					<ObjectStatus  text="{= ${Discontinued} ? ${i18n>Discontinued} : ${i18n>Available} }"  state="{= ${Discontinued}? 'Error' : 'Success' }"/>
   				</firstStatus>
   			</ObjectListItem>
   		</List>
   	</Page>
   </mvc:View>
   

2. To handle the search, we’ll specify a handler for the search field’s ‘search’ event. This handler, handleSearch, is defined in the view’s controller, and the search effect is achieved by adding a ‘contains string’ filter to the binding of the List control’s items aggregation. Add a listener for the search event in the webapp/webapp/controller/List.controller.js.

   sap.ui.define([
   "sap/ui/core/mvc/Controller",
   "sap/ui/model/Filter",
   "sap/ui/model/FilterOperator"
   ],
   function (Controller, Filter, FilterOperator) {
       "use strict";
   
       return Controller.extend("sap.cp.webapp.controller.List", {
           handleSearch: function (evt) {
               // create model filter
               var filters = [];
               var query = evt.getParameter("query");
               if (query && query.length > 0) {
                   filters.push(new Filter({
                       path: "ProductName",
                       operator: FilterOperator.Contains,
                       value1: query
                   }));
               }
   
               // update list binding
               var list = this.getView().byId("list");
               var binding = list.getBinding("items");
               binding.filter(filters);
           },
   
           handleListItemPress: function (oEvent) {
               var oRouter = sap.ui.core.UIComponent.getRouterFor(this);
               var selectedProductId = oEvent.getSource().getBindingContext().getProperty("ProductID");
               oRouter.navTo("detail", {
                   productId: selectedProductId
               });
           }
       });
   });
   

Similarly to the previous step, this step will add additional controls to the existing page. Add an ObjectHeader and a footer to use the full width of the page for the content.

1. Open the webapp/webapp/view/Detail.view.xml file, and replace the highlighted lines.

   <mvc:View controllerName="sap.cp.webapp.controller.Detail"
   xmlns:mvc="sap.ui.core.mvc" displayBlock="true"
   xmlns="sap.m">
   	<Page id="detail" title="{i18n>DetailTitle}" showNavButton="true" navButtonPress="handleNavButtonPress">
   		<ObjectHeader title="{ProductName}" number="{= ((${UnitPrice} * 100) / 100).toFixed(2) }" numberUnit="{i18n>Currency}">
   			<statuses>
   				<ObjectStatus text="{= ${Discontinued} ? ${i18n>Discontinued} : ${i18n>Available} }" state="{= ${Discontinued} ? 'Error' : 'Success' }"/>
   				<ObjectStatus text="{= (${UnitsOnOrder} > 0) ?  ${i18n>Ordered} : ${i18n>NotOrdered} }" state="Success"/>
   			</statuses>
   			<attributes>
   				<ObjectAttribute text="Product #{ProductID}"/>
   				<ObjectAttribute text="Category #{CategoryID}"/>
   				<ObjectAttribute text="Supplier #{SupplierID}"/>
   			</attributes>
   		</ObjectHeader>
   		<footer>
   			<Bar>
   				<contentRight>
   					<Button text="{i18n>OrderButtonText}" type="Accept" icon="sap-icon://accept" press="handleOrder"/>
   				</contentRight>
   			</Bar>
   		</footer>
   	</Page>
   </mvc:View>
   

   1. The previous snippet contains a button. Let’s implement the logic to display a MessageBox once this button has been pressed. Add a missing imports and the listener for the press event in the webapp/webapp/controller/Detail.controller.js.

      sap.ui.define([
          "sap/ui/core/mvc/Controller",
          "sap/m/MessageBox",
          "sap/m/MessageToast"
      ],
          function (Controller, MessageBox, MessageToast) {
              "use strict";
      
              return Controller.extend("sap.cp.webapp.controller.Detail", {
                  onInit: function () {
                      var oRouter = sap.ui.core.UIComponent.getRouterFor(this);
                      oRouter.getRoute("detail").attachMatched(this._onRouteMatched, this);
                  },
                  _onRouteMatched: function (oEvent) {
                      var oArgs, oView;
                      oArgs = oEvent.getParameter("arguments");
                      oView = this.getView();
                      oView.bindElement({
                          path: "/Products(" + oArgs.productId + ")",
                          events: {
                              dataRequested: function () {
                                  oView.setBusy(true);
                              },
                              dataReceived: function () {
                                  oView.setBusy(false);
                              }
                          }
                      });
                  },
                  handleNavButtonPress: function (evt) {
                      var oRouter = sap.ui.core.UIComponent.getRouterFor(this);
                      oRouter.navTo("home");
                  },
      
                  handleOrder: function (evt) {
                      // show confirmation dialog
                      var bundle = this.getView().getModel("i18n").getResourceBundle();
                      MessageBox.confirm(
                          bundle.getText("OrderDialogMsg"),
                          function (oAction) {
                              if (MessageBox.Action.OK === oAction) {
                                  // notify user
                                  var successMsg = bundle.getText("OrderDialogSuccessMsg");
                                  MessageToast.show(successMsg);
                                  // TODO call proper service method and update model (not part of this tutorial)
                              }
                          },
                          bundle.getText("OrderDialogTitle")
                      );
                  }
              });
          });