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method by passing the method the attribute name alone. Had there been multiple elements in the document, the attr() method would access the first matched element. The code when loaded into a browser will alert() the value that we set for the href attribute. Now, since most elements have more than one attribute available, it’s also possible to set multiple attribute values using a single attr() method. For example, we could also set the title attribute in the previous example by passing the attr() method an object instead of two string parameters: jQuery('a').attr({'href':'http://www.jquery.com','title':'jquery.com'}).attr('href') With the ability to add attributes to elements also comes the ability to remove attributes and their values. The removeAttr() method can be used to remove attributes from HTML elements. To use this method, simply pass it a string value of the attribute you’d like to remove (e.g., jQuery('a')removeAttr('title')). Discussion In addition to the attr() method, jQuery provides a very specific set of methods for working with the HTML element class attribute. Since the class attribute can contain several values (e.g., class="class1 class2 class3"), these unique attribute methods are used to manage these values. These jQuery methods are as follows: addClass() Updates the class attribute value with a new class/value including any classes that were already set hasClass() Checks the value of the class attribute for a specific class removeClass() Removes a unique class from the class attribute while keeping any values already set toggleClass() Adds the specified class if it is not present; removes the specified class if it is present 1.15 Getting and Setting HTML Content Problem You need to get or set a chunk of HTML content in the current web page. 30 | Chapter 1: jQuery Basics
Solution jQuery provides the html() method for getting and setting chunks (or DOM structures) of HTML elements. In the following code, we use this method to set and then get the HTML value of the element found in the HTML document: jQuery('p').html('Hello World, I am a element.'); alert(jQuery('p').html()); Running this code in a browser will result in a browser alerting the HTML content contained within the element, which we set using the html() method and then retrieved using the html() method. Discussion This method uses the DOM innerHTML property to get and set chunks of HTML. You should also be aware that html() is not available on XML documents (although it will work for XHTML documents). 1.16 Getting and Setting Text Content Problem You need to get or set the text that is contained inside of an HTML element(s). Solution jQuery provides the text() method for getting and setting the text content of elements. In the following code, we use this method to set and then get the text value of the element found in the HTML document: 1.16 Getting and Setting Text Content | 31
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Solutions & Examples for jQuery Dev
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Page 8 and 9: 2.3 Selecting Elements by Index Ord
Page 10 and 11: 8.5 Passing Dynamic Data to Event H
Page 12 and 13: 16.5 Using HTML Fragments and jQuer
Page 14 and 15: This is largely what makes somethin
Page 16 and 17: on client-side optimization techniq
Page 18 and 19: Tech Editors Karl Swedberg, after h
Page 20 and 21: What You’ll Learn We’ll start o
Page 22 and 23: If none of this works, it’s possi
Page 24 and 25: 800-998-9938 (in the United States
Page 26 and 27: traversing and manipulation, browse
Page 28 and 29: • Using the jQuery wrapper and im
Page 30 and 31: The jQuery wrapper set A good major
Page 32 and 33: — Attr — Class — HTML — Tex
Page 34 and 35: alert('jQuery ' + jQuery.fn.jquery)
Page 36 and 37: alert(jQuery('p').text()); }); T
Page 38 and 39: You should be aware that the first
Page 40 and 41: "4 inputs" alert('selected' + jQuer
Page 42 and 43: 1.6 Finding Descendant Elements Wit
Page 44 and 45: .end().end().length); //alerts 3
Page 46 and 47: Now, let’s select the second ele
Page 48 and 49: jQuery('jQuery').find('a').attr('hr
Page 50 and 51: • While the elements selected are
Page 52 and 53: Discussion The cloning method is ac
Page 56 and 57: jQuery('p').text('Hello World,
Page 59 and 60: 2.0 Introduction CHAPTER 2 Selectin
Page 61 and 62: It’s worth noting that combinator
Page 63 and 64: all siblings that follow, not just
Page 65 and 66: Discussion As mentioned, an element
Page 67 and 68: 2.6 Selecting Elements by What They
Page 69 and 70: The preceding selector would select
Page 71 and 72: These filters can also be used with
Page 73 and 74: Solution As well as passing a selec
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Page 78 and 79: alert(urls.join(",")); We were able
Page 80 and 81: Even though this may be the most ob
Page 82 and 83: Figure 3-2. Code output As you can
Page 84 and 85: Chapter 3 - Recipe 3 - Converting a
Page 86 and 87: Figure 3-4. Code output 3.4 Getting
Page 88 and 89: Discussion The core method index()
Page 90 and 91: Figure 3-6. Code output In the prec
Page 92 and 93: ligula. Aenean mattis pulvinar est
Page 94 and 95: Solution Let’s say you inherit a
Page 96 and 97: If you use this technique, you will
Page 98 and 99: available on the Web. jQuery hosts
Page 100 and 101: Discussion In the preceding example
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}); })(jQuery); 4.3 Filtering Array
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Discussion In this example, we have
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}); }); })(jQuery); Discussion Upon
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Discussion In this recipe, we use t
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Solution The if/else statement and
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var foo = new Foo( 'bar' ); foo.ale
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} $('#province').toggle( value == '
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Did jQuery invent chaining? No. jQu
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Whether the idea comes from elsewhe
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}; return object; That could also b
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null or undefined, remove the attri
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The +new Date in this code is just
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(function() { var log = [], index =
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The page also contains a large numb
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you could use this: $('.clientX') /
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And you have this HTML code in your
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when you discover the slow parts, y
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A Warning About for..in Loops Never
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Other code here calls maxMagnitude
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matter, but in performance-critical
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console.log( $foo ); $foo.css({ fon
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Solution 1 You’re using the minif
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After the page loads, you are down
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5.19 Writing Unobtrusive JavaScript
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Documentation Tutorials We’ve
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Beware that you don’t make the us
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+ $(document).scrollLeft() }) .show
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Want to read more? You can find thi
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