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CHAPTER 2 GETTING STARTED...Submit Order...• Tip If the selector that I passed to the appendTo method had matched multiple elements, then jQuery wouldduplicate the elements from the HTML fragment and insert a copy as the last child of every matched element.jQuery defines a number of methods that you can use to insert child elements into the document,and the most useful of these are described in Table 2-2. When you append elements, they become thelast children of their parent element. When you prepend elements, they become the first children of theirparents. (I’ll explain why there are two append and two prepend methods later in this chapter.)Table 2-2. jQuery Methods <strong>for</strong> Inserting Elements in the DocumentMethodappend(HTML)append(jQuery)prepend(HTML)prepend(jQuery)appendTo(HTML)appendTo(jQuery)prependTo(HTML)prependTo(jQuery)DescriptionInserts the specified elements as the last children of all the elementsin the DOMInserts the specified elements as the first children of all the elementsin the DOMInserts the elements in the jQuery object as the last children of theelements specified by the argumentInserts the elements in the jQuery object as the first children of theelements specified by the argumentApplying a CSS ClassIn the previous example, I inserted an a element, but I did not assign it to a CSS class. Listing 2-6 showshow I can correct this omission by making a call to the addClass method.22www.it-ebooks.info
CHAPTER 2 GETTING STARTEDListing 2-6. Chaining jQuery Method Calls...$(document).ready(function() {$('#buttonDiv input:submit').hide();$('Submit Order').appendTo("#buttonDiv").addClass("button");})...Notice how I have simply added the call to the addClass method to the end of the statement. This isknown as method chaining, and a library that supports method chaining is said to have a fluent API.Most jQuery methods return the same jQuery object on which the method was called. In theexample, I create the jQuery object by passing an HTML fragment to the $ function. This produces ajQuery object that contains an a element. The appendTo method inserts the element into the documentand returns a jQuery object that contains the same a element as its result. This allows me to make furthermethod calls, such as the one to addClass. Fluent APIs can take a while to get used to, but they enableconcise and expressive code and reduce duplication.The addClass method adds the class specified by the argument to the selected elements, like this:...Submit Order...The a.button class is defined in styles.css and brings the appearance of the a element into linewith the rest of the document.UNDERSTANDING METHOD PAIRS AND METHOD CHAININGIf you look at the methods described in Table 2-2, you will see that you can append or prepend elements intwo ways. The elements you are inserting either can be contained in the jQuery object on which you call amethod or can be in the method argument. jQuery provides different methods so you can select whichelements are contained in the jQuery object <strong>for</strong> method chaining. In my example, I used the appendTomethod, which means I can arrange things so that the jQuery object contains the element parsed from theHTML fragment, allowing me to chain the call to the addClass method and have the class applied to the aelement.The append method reverses the relationship between the parent and child elements, like this:$('#buttonDiv').append('Submit Order').addClass("button");In this statement, I select the parent element and provide the HTML fragment as the method argument.The append method returns a jQuery object that contains the buttonDiv element, so the addClass takeseffect on the parent div element rather than the new a element.23www.it-ebooks.info
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Page 3 and 4: Contents at a Glance• About the A
Page 5 and 6: CHAPTER 1 GETTING READYWhat Do You
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Page 9 and 10: CHAPTER 1 GETTING READYWould you l
Page 11 and 12: CHAPTER 1 GETTING READYThe server-
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Page 15 and 16: CHAPTER 1 GETTING READY{{each prop
Page 17 and 18: C H A P T E R 2Getting StartedIn th
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Page 49 and 50: CHAPTER 3 ADDING A VIEW MODELCreat
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C H A P T E R 4Using URL RoutingIn
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CHAPTER 4 USING URL ROUTINGwe requ
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CHAPTER 4 USING URL ROUTINGAdding
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CHAPTER 4 USING URL ROUTINGApplyin
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CHAPTER 4 USING URL ROUTINGConsoli
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CHAPTER 4 USING URL ROUTINGThe app
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C H A P T E R 5Creating Offline Web
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CHAPTER 5 CREATING OFFLINE WEB APP
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C H A P T E R 6Storing Data in the
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CHAPTER 6 STORING DATA IN THE BROW
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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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CHAPTER 9 WRITING BETTER JAVASCRIP
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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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