Beginning JavaScript with DOM Scripting and Ajax, 2nd Edition

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Chapter 5 ■ Presentation and Behavior (CSS and Event Handling) fixColumnHeight.js (excerpt) fixcolumns={ highest:0, moreClass:'more', init:function(){ if(!document.getElementById || !document.createTextNode){return;} fixcolumns.n=document.getElementById('news'); if(!fixcolumns.n){return;} fixcolumns.fix('h3'); fixcolumns.fix('p'); fixcolumns.fix('li'); }, The fix() method invokes two additional methods: one to find out the maximum height to apply to each of the items and another to apply this height. fixColumnHeight.js (excerpt) fix:function(elm){ fixcolumns.getHighest(elm); fixcolumns.fixElements(elm); }, The getHighest() method first sets the parameter highest to 0 and then loops through all the elements inside the list that match the element name that was sent as the elm parameter. It then retrieves the element’s height by reading the offsetHeight attribute. This attribute stores the height of the element after it has been rendered by the browser. The method then checks whether the height of the element is larger than the property highest and sets the property to the new value if that is the case. That way, you find out which element is the highest. fixColumnHeight.js (excerpt) getHighest:function(elm){ fixcolumns.highest=0; var temp=fixcolumns.n.getElementsByTagName(elm); for(var i=0;ifixcolumns.highest){ fixcolumns.highest=temp[i].offsetHeight; } } }, ■ ■Caution You need to reset the highest parameter to 0 here, because getHighest() needs to find the highest of the elements that were sent as a parameter, not of all the elements you fix. If by some freak accident an H3 is higher than the highest paragraph, you’ll get gaps between the paragraphs and the “more” links. 122 www.it-ebooks.info
Chapter 5 ■ Presentation and Behavior (CSS and Event Handling) The fixElements() method then applies the maximum height to all the elements with the given name. Notice that you need to test for the class determining the “more” links; otherwise, the links would get the same height as the highest content paragraph. fixElements:function(elm){ var temp=fixcolumns.n.getElementsByTagName(elm); for(var 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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The Date Object Chapter 2 ■ Data
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Generating a Random Number Chapter
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Chapter 2 ■ Data and Decisions Ja
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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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User Feedback Methods The user feed
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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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