Beginning JavaScript with DOM Scripting and Ajax, 2nd Edition

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Chapter 5 ■ Presentation and Behavior (CSS and Event Handling) width: 1px !important; overflow: hidden; } li.current{ background:#ccf; } li.current h3{ background:#69c; } The script for collapsing the elements is not complex, but it uses all the event-handling elements I talked about: newsItemCollapse.js newshl={ // CSS classes overClass:'over', // Rollover effect hideClass:'hide', // Hide things currentClass:'current', // Open item init:function(){ var ps,i,hl; if(!document.getElementById || !document.createTextNode){return;} var newsList=document.getElementById('news'); if(!newsList){return;} var newsItems=newsList.getElementsByTagName('li'); for(i=0;i
Chapter 5 ■ Presentation and Behavior (CSS and Event Handling) hover:function(e){ var hl=e.target.parentNode.parentNode; var action=e.type=='mouseout'?'remove':'add'; DOMhelp.cssjs(action,hl,newshl.overClass); } } window.addEventListener ('load',newshl.init,false); The results are clickable news headings that show associated news excerpts when you click them. The “more” links stay unaffected and will send the visitor to the full news article when clicked. (See Figure 5-6.) Figure 5-6. Expanding new items by clicking the headings Let’s go through the whole script step by step. After defining the CSS class properties and checking for the necessary elements, you loop through the list items, grab the first link (which is the one inside the heading), and assign event listeners for click, mouseover, and mouseout. The click event should fire the newshl.toggleNews() method, while both mouseout and mouseover should trigger newshl.hover(). newsItemCollapse.js (excerpt) for(i=0;i
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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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Chapter 2 ■ Data and Decisions
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The Date Object Chapter 2 ■ Data
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Generating a Random Number Chapter
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Chapter 2 ■ Data and Decisions if
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Chapter 2 ■ Data and Decisions Ja
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Chapter 2 ■ Data and Decisions Ea
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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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Chapter 4 HTML and JavaScript In th
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Chapter 4 ■ HTML and JavaScript F
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Page 181 and 182: User Feedback Methods The user feed
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Chapter 6 ■ Common Uses of JavaSc
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Chapter 7 ■ JavaScript and User I
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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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Chapter 11 ■ Using Third-Party Ja
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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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