Beginning JavaScript with DOM Scripting and Ajax, 2nd Edition

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Chapter 6 ■ Common Uses of JavaScript: Images and Windows newimg.setAttribute('src', t.getAttribute('href') ); document.body.appendChild( pop.popContainer ); pop.positionPopup( t ); If the popContainer already exists, all the method does is call the killPopup() method, reset the link to its original content, and remove the class that indicates that the photo is shown. Calling cancelClick() prevents the link from simply showing the photo in the browser. picturePopup.js (continued) } else { pop.killPopup(); t.innerHTML = t.preset; DOMhelp.cssjs('remove', t,pop.openPopupLinkClass ); } DOMhelp.cancelClick( e ); }, The positionPopup() method defines two variables (x and y), initializes them both to 0, and then reads the height of the element from its offsetHeight property. It next reads the vertical and horizontal position of the element and all its parent elements and adds those to x and y. The result is the position of the element relative to the document. The method then positions the photo container below the original link by adding the height of the link to the vertical variable y and altering the popContainer style properties: picturePopup.js (continued) positionPopup : function( o ) { var x = 0; var y = 0; var h = o.offsetHeight; while ( o != null ) { x += o.offsetLeft; y += o.offsetTop; o = o.offsetParent; } pop.popContainer.style.left = x + 'px'; pop.popContainer.style.top = y + h + 'px'; }, The killPopup() method removes the popContainer from the document—clearing the property by setting its value to null—and prevents the default link action from taking place by calling cancelClick(). ■ ■Note You can remove a node from the document by calling the removeChild() method of its parent node, with the node itself as the child node to remove. However, because you use a property that points to the node rather than checking for the node itself, you also need to set this property to null. 194 www.it-ebooks.info
Chapter 6 ■ Common Uses of JavaScript: Images and Windows picturePopup.js (continued) killPopup : function( e ) { pop.popContainer.parentNode.removeChild( pop.popContainer ); pop.popContainer = null; DOMhelp.cancelClick( e ); } } DOMhelp.addEvent( window, 'load', pop.init, false ); The result is that you can click any image pointing to a photo with the correct class, and it’ll show the image below it. Figure 6-17 shows an example. Figure 6-17. An example of a dynamically displayed photo The beauty of this approach is that it is not only limited to photos. With just a simple modification, you can display other documents inside the current one. The trick is to dynamically add an IFRAME element to the photoContainer and set its src attribute to the document you want to embed. The demonstration exampleIframeForPopup.html does exactly that to show a lengthy terms-and-conditions document inside the main one. The only differences (apart from different property names, because the method does not show a photo) are in the openPopup method, where you add the new IFRAME: iframeForPopup.js (excerpt) var ifr = document.createElement('iframe'); pop.ifrContainer.appendChild( ifr ); ifr.setAttribute('src', t.getAttribute('href') ); Figure 6-18 shows what this could look like. www.it-ebooks.info 195
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Contents at a Glance About the Auth
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Chapter 1 Getting Started with Java
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Chapter 1 ■ Getting Started with
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Chapter 2 Data and Decisions Data a
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The Date Object Chapter 2 ■ Data
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Generating a Random Number Chapter
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Chapter 3 From DHTML to DOM Scripti
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Chapter 3 ■ From DHTML to DOM Scr
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Variable and Function Scope Chapter
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Changing Attributes of Elements Cha
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Shortening Your Scripts via InnerHT
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DOMhelp: Your Own Helper Library Ch
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Chapter 5 Presentation and Behavior
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Chapter 8 Back-End Interaction with
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Chapter 8 ■ Back-End Interaction
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Replacing XML with JSON Chapter 8
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Summary Chapter 8 ■ Back-End Inte
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Chapter 9 ■ Data Validation Techn
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Chapter 10 Modern JavaScript Case S
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Chapter 10 ■ Modern JavaScript Ca
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APPENDIX A ■ Debugging JavaScript
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Index • A Anonymous function, 67
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■ Index • F Flash of unstyled c
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■ Index initialization method, 17
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Beginning JavaScript with DOM Scrip
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For Dad. Thanks for Saturdays full
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■ Contents The Composite Data Typ
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■ Contents Slide Shows 160 Summar
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■ Contents ■■Chapter 10: Mode
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About the Authors Russ Ferguson is
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Acknowledgments I want to thank eve
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Beginning JavaScript with DOM Scripting and Ajax, 2nd Edition

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