PART II: LEARNING THE JQUERY FUNDAMENTALS in Java

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PART II: LEARNING THE JQUERY FUNDAMENTALS
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<li><a href= /index >Home</a></li> <li><a href= /about >About Us</a></li> <li><a href= /customer-service >Customer Service</a></li> <li><a href= /contact >Contact Us</a></li> <li><a href= /coupons >Coupons</a></li> </ul> </div> </body> </html>
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Figure 3-10: The browser output after the rst and last lters have been applied to the list
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FILTERING ELEMENTS THAT CONTAIN A SPECIFIC ELEMENT
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You may want to add a filter that finds only elements that have a specific element inside of them. In these cases, you can use the has() filter. The child element contained within does not have to be a direct child of the parent container: It could instead be a descendent. In the following HTML example, I want to add a filter that increases the font size of only p tags that are found within div s with the class name (.content). Figure 3-11 shows the browser output of the p tag contained within the specified element.
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<!doctype html> <html> <head> <script src= http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js ></
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CHAPTER 3: USING SELECTORS, FILTERS, AND CSS: JQUERY AT ITS CORE
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script> <script> $(document).ready(function() { $( .content:has(p) ).css( font-size , 18px ); }); </script> <body> <div id= main > <div class= content > <p>This is my content</p> </div> <div class= alternate > <p>This is alternate content.</p> </div> </div> </body> </html>
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Figure 3-11: The browser output of the p tag contained within the speci ed element
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FILTERING ELEMENTS THAT DO NOT CONTAIN ANY ELEMENTS OR TEXT
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Finding empty elements in the DOM can be useful. If you have an empty element on your page, you can use the :empty filter to find it. In the following HTML example, I want to hide the error div if it is empty. I just need to select the .error class and add the :empty filter. If the error message has content, it
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PART II: LEARNING THE JQUERY FUNDAMENTALS
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remains showing; otherwise, the display:none CSS is applied to it. Figure 3-12 shows the browser output when the selector encounters an empty element.
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<!doctype html> <html> <head> <script src= http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js ></ script> <script> $(document).ready(function() { $( .error:empty) ).css( display , none ); }); </script> <body> <div id= main > <div class= error ></div> <div class= error >This is my error message</div> <div class= content > <p>This is my content</p> </div> <div class= alternate > <p>This is alternate content.</p> </div>
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</div> </body> </html>
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Figure 3-12: The browser output when the selector encounters an empty element
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CHAPTER 3: USING SELECTORS, FILTERS, AND CSS: JQUERY AT ITS CORE FILTERING ELEMENTS THAT CONTAIN TEXT
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In some cases, you may want to filter selectors based on the text that the element contains. You can do so using the :contains filter. The text that you pass to the :contains filter can be enclosed in quotes or just plain text. In the following HTML example, I want to hide the error div if it s empty. I just need to select the .error class and add the :empty filter. If the error message has content, it displays otherwise, the display:none CSS is applied to it. Figure 3-13 shows the browser output after the filter finds a td cell containing the specified string Paper Towels .
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<!doctype html> <html> <head> <script src= http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js ></ script> <script> $(document).ready(function() { $( tr td:contains( Paper Towels ) ).css( border , 1px dashed #333 ); }); </script> <body> <table> <tr> <th>Product</th> <th>Description</th> <th>Price</th> </tr> <tr> <td>Paper Towels</td> <td>The most absorbent paper towels.</td> <td>$18.99</td> </tr> <tr> <td>Paper Napkins</th> <td>Perfect for your outdoor gathering.</th> <td>$16.99</th> </tr> <tr> <td>Paper Plates</td> <td>The best value.</td> <td>$5.99</td> </tr> <tr> <td>Plastic Forks</td> <td>The essential picnic accessory.</td> <td>$2.99</td> </tr>
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PART II: LEARNING THE JQUERY FUNDAMENTALS
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</table> </body> </html>
Figure 3-13: The browser output after the lter nds a td cell containing the speci ed string 'Paper Towels'
SELECTING ELEMENTS IN THE DOM BY THEIR ATTRIBUTES
Attributes of a tag are useful for passing extra information about the tag, or for interacting with JavaScript. A common HTML tag is the <a> anchor tag, which can have such attributes as href, rel, id, class, title, hreflang. Selecting by attribute works well with form fields because you can search inputs by name, type, attribute, class, ID, and so on. You can use any of the attributes in Table 3.3 when selecting elements from the DOM. I focus on attributes in more in-depth tutorials later in the book, but for now, I m going to go over two common examples of how to work with attributes.