Tabbed forms are awesome. When you have a data-entry intensive web application – they can sometimes make the difference between a dull looking application and a friendly one. However – they are not a good fit for every scenario.
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Baa.. took a lot of searching in code, and I don’t particularly like the result – but it is what it is. The main issue is that my designer wanted us to get clever with how form validation error messages are displayed to the user. the <form:errors> tag is very useful for most cases – where you basically only want to display the errors to the users, perhaps with a specific class in mind. You can also ask it to change its default rendering of a <span> element to, say, a <div> element – but my designer wanted something else completely, and sent me on a wild goose chase.
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This took a whole day for me. Hopefully I can save you the pain. I added quite a few possible search terms here for maximum coverage, so the text may get a bit repetitive. I mean – when I tried to look for a solution, I didn’t even know what to look for – so I tried googling for every symptom I saw, to no avail.
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Double submit is when a user submits a form on your web page twice (well, technically they can do it more than twice, but you can’t call it a double submit…)
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If you followed part 2 of this tutorial, you have an appengine application that displays a Google map in your browser, and lets you click the map to add markers to it.
While extremely useful on long, cold Winter nights, you probably want more from your application. For example, you’d probably like to be able to save those markers somewhere, so you can share them with your users.
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Google’s appengine is the Google cloud offering. It is highly scalable, and provides a free entry level cloud application platform. However, it is not very trivial to develop for and deploy on.
Google maps API version 3 is the current (June 2011) officially supported version of integrating with Google maps. The API allows you to display and manipulate maps in may ways.
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