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home > news > java technology > busy status indicator with jsf 2

Busy status indicator with JSF 2

I've had a few requests on how to write a busy status indicator - you know, the little spinning ball that's there while an Ajax call is active, and which goes away once the request is complete. So, I spent about two hours today, and did just that - including putting it into a component so it's reusable. As usual, it involved no Java, and only a minimal amount of JavaScript. First, I needed an animated gif for a spinning image - there were a number at http://mentalized.net/activity-indicators - I just picked one. They're all in the public domain, and there are other sites which offer similar animated gif spinners. After that, I tried to imagine what it would look like in the using page. Something like this seemed appropriate: 1 6 7 Busy Busy 8 9 10 11 12 13 14 15 16 17 18 On line 13, you see a component, busystatus, with a single attribute, "for", which is pointing at the rendered ID of the component I want to monitor. Otherwise, it's a straightforward JSF Ajax app - Ajaxify the "in" component, write to the the "out" component. I had to use the rendered ID (busyForm:in) rather than the JSF id (in), because there was no easy way to do ID resolution inside the component, but we've had to deal with that often enough at this point that the difference shouldn't be too confusing. We...


Date: September, 02 2009
Url: http://www.java.net/blog/driscoll/archive/2009/09/02/busy-status-indicator-jsf-2


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