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1414 Part V . Putting JavaScript to Work (Web hosting providers)

Sunday, July 22nd, 2007 } document.write(output) This page has a lot of code to digest in one reading. Run the application, study the structure of the source code listing file, and re-read the previous explanations. It may take several readings for a mental picture of the application to form. Lessons Learned As soon as the external cross-platform API was in place, it helped frame a lot of the other code in the main program. The APIs provided great comfort in that they encouraged me to reference a complex object fully in the main code as a platform- shared value (for example, the selectedObj and selectedStateLabelglobal variables). At the same time, I could reference top-level elements (that is, non-nested objects) simply by their names when passing them to API functions. In many respects, the harder task was defining the style sheet attributes and syntax that both browsers would treat similarly. In the case of the label objects, I couldn t reach complete parity in a cross-platform environment (the labels look different in NN4), and in the case of the help object, I had to code the HTML separately for each platform. Therefore, when approaching this kind of project, work first with the HTML and CSS syntax to build the look that works best for all platforms. Then start connecting the scripted wires. You may have to adjust the CSS code if you find odd behavior in one platform or the other with your scripting, but starting with a good layout is still easier. But without a doubt the biggest lesson you learn from working on a project like this is how important it is to test an application on as many browsers and operating systems as possible. Designing a cross-platform application on one browser and having it run flawlessly on the other the first time is nearly impossible. Be prepared to go back and forth among multiple browsers, breaking and repairing existing working code along the way until you eventually reach a version that works on every browser that you can test. …
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