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CHAPTER 3 ADDING A VIEW MODELI also moved the submit button so that it is under the basket, making it easier for the user to submittheir order. The style that I assigned to the basket elements uses the fixed value for the CSS positionproperty, meaning that the basket will always be visible, even as the user scrolls down the page. Toaccommodate the basket, I used jQuery to apply a new value for the CSS width property directly to thecheese category elements (but not the basket itself):$('div.cheesegroup').not("#basket").css("width", "50%");Removing Items from the BasketThe last set of changes builds on the a elements that are added to each table row in the basketRowTmpltemplate:$('#basketTable a').button({icons: {primary: "ui-icon-closethick"}, text: false}).click(function() {var targetId = $(this).closest('tr').attr("data-prodId");mapProducts(function(item) {if (item.id == targetId) {item.quantity(0);}});})I use jQuery to select all the a elements and use jQuery UI to create buttons from them. jQuery UIthemes include a set of icons, and the object that I pass to the jQuery UI button method creates a buttonthat uses one of these images and displays no text. This gives me a nice small button with a cross.In the click function, I use jQuery to navigate from the a element that triggered the click event tothe first ancestor tr element using the closest method. This selects the tr element that contains thecustom data attribute I inserted in the template earlier and that I read using the attr method:var targetId = $(this).closest('tr').attr("data-prodId");This statement lets me determine the id of the product the user wants to remove from the basket. Ithen use the mapProducts function to find the matching cheese object and set the quantity to zero. Sincequantity is an observable data item, KO disseminates the new value, which causes the subtotal value tobe recalculated and the visible binding on the corresponding tr element to be reevaluated. Since thequantity is zero, the table row will be hidden automatically. And, since subtotal is observable, the totalwill also be recalculated, and the new value is displayed to the user. As you can see, it is useful to have aview model where the dependencies between data values are managed seamlessly. The net result is adynamic basket that is always consistent with the values in the view model and so always presents thecorrect information to the user.Finishing the ExampleBefore I finish this topic, I just want to tweak a couple of things. First, the basket looks pretty poor whenno items have been selected by the user, as shown in Figure 3-6. To address this, I will display someplaceholder text when the basket is empty.71www.it-ebooks.info
CHAPTER 3 ADDING A VIEW MODELFigure 3-6. The empty basketSecond, the user has no way to clear the basket with a single action, so I will add a button that willreset the quantities of all of the products to zero. Finally, by moving the submit button outside the formelement, I have lost the ability to rely on the default action. I must add an event handler so that the usercan submit the form. Listing 3-10 shows the HTML elements that I have added to support these features.Listing 3-10. Adding Elements to Finish the Example...Gourmet European CheeseBasketNo products selectedCheeseSubtotalTotal:$72www.it-ebooks.info
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Contents at a Glance• About the A
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CHAPTER 1 GETTING READYWhat Do You
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CHAPTER 1 GETTING READYChapter 8:
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Page 77 and 78: C H A P T E R 4Using URL RoutingIn
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C H A P T E R 6Storing Data in the
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C H A P T E R 7Creating Responsive
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CHAPTER 7 CREATING RESPONSIVE WEB
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C H A P T E R 8Creating Mobile Web
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CHAPTER 8 CREATING MOBILE WEB APPS
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C H A P T E R 9Writing Better JavaS
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• INDEXHTML5 local storage featur
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• INDEXURL routing, CheeseLux (co
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Pro JavaScript for Web AppsCopyrigh
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Contents• About the Author.......
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• CONTENTS• Chapter 3: Adding a
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• CONTENTSUsing Persistence in th
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• CONTENTSAdding Tests for a Modu
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About the Technical Reviewer RJ Owe
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