I have a project that will use the geolocation API in Firefox 3.5, Google Gears and other JS frameworks. It will need to keep the user's position updated using the watchPosition API, fetching nearby POIs and such whenever the position changes.
I'm actually fairly new to AJAX, and am trying to figure out the best way to do this. Most of the AJAX examples I've seen involve user interaction, such as entering into a text field than removing focus, or waiting on state updates, as with comet. In this case, there's state that may update often or never, and those updates will be triggered by a callback function in the background, with no user interaction into which I can hook. I also don't want to leave a Comet connection open to the app waiting on updates, since the app may see mobile use, and I can't imagine holding open a connection being great for battery life. I'm wondering what the best way to do this would be, while staying fairly close to what Lift offers? Thus far I have two options. 1. Create a REST API and have the Javascript call a specified URL whenever the position changes, inserting the resulting JSON into the page at appropriate places. This works, but seems like it'd involve lots of extra effort, as well as straying away from Lift/Scala's added benefits into the dynamicity of JS, which I'm not entirely comfortable with. 2. Create a hidden JSON form on the page. When the position changes, the JS callback function fills out and submits the form in the background. This seems a bit hackish, with the hidden form and all, but this makes the problem one that is on a bit less shaky Lift ground. I can then use Lift's provided functionality to generate JS for replacing page contents with the results of evaluating the form submission. I'm basically going from the Lift book here. Most ideal, I'd think, would be if there was some way to have my callback function call a snippet directly and be handed back the JS needed, without having to create a separate web service API for this one call. Is the JSON form method the best option here? Or is there some new shiny in 1.1 that isn't documented in the Lift book yet? (or perhaps it *is* documented and I'm just missing it. :) Thanks. -- Nolan Darilek http://thewordnerd.info --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Lift" group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~----------~----~----~----~------~----~------~--~---
