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JSON-P is a really handy technique However, to call it anything other than a trick, even a hack, would mean we aren t being quite honest! It s most definitely thinking outside the box, that s for sure! As neat a trick as it is, it has one significant flaw: error handling That is to say, there really is none There is no error callback as with a typical Ajax request, no interrogating HTTP status codes, or any of that Your script simply doesn t do something you expected it to do Oh, you may well see a failed outbound request in a debug tool such as Firebug, but that s about it, and that won t generally help your end users I m talking here about hard errors in other words, HTTP errors.

You build Linux frontends in the same manner as you built the MythTV machine in s 2 and 3. When you re compiling the MythTV code, you don t need to build the backend as well as the frontend, and the backend on these machines won t be used. Unfortunately, there is no easy way to disable compiling the backend code, so we ll just show how to compile it and then never use the backend. Frontends don t need their own copies of MySQL running or XMLTV and the guide data setup, so don t install them on the new frontend machine. Here is a brief overview of the relevant steps to build MythTV for your new frontend. You can find a more complete discussion in s 2 and 3. $ sudo apt-get build-dep mythtv Password: Reading package lists... Done Building dependency tree... Done The following NEW packages will be installed: ... Need to get 37.9MB of archives. After unpacking 135MB of additional disk space will be used. Do you want to continue [Y/n] y Get:1 http://security.ubuntu.com dapper-security/main libfreetype6-dev 2.1.10-1ubuntu2.2 [677kB] ... $ sudo apt-get install libqt3-mt-mysql Reading package lists... Done Building dependency tree... Done The following NEW packages will be installed: libqt3-mt-mysql 0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded. Need to get 51.9kB of archives. After unpacking 139kB of additional disk space will be used. Get:1 http://archive.ubuntu.com dapper-updates/universe libqt3-mt-mysql 3:3.3.6-1ubuntu6 [51.9kB] Fetched 51.9kB in 1s (47.0kB/s) Selecting previously deselected package libqt3-mt-mysql.

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Anything the remote service can handle is okay because the service will usually define some sort of error element(s) in the JSON for you to check for But for the hard failures, it s a whole different ballgame There is one way you can get at least some degree of hard error handling: use a time-out In other words, you fire off a request, and you start a JavaScript time-out, say to fire some function in 5 seconds In the callback to the JSON-P request, you cancel the time-out So, if the request takes longer than 5 seconds to execute, you take that to mean that the call failed, and the function the time-out fires is essentially your error handler (If the response comes back in less than 5 seconds, that function will never fire because the timeout is canceled first.

) This clearly isn t ideal: who s to say the request didn t just go long and is taking a little more than 5 seconds to complete In fact, you could arguably make matters worse because you might flash an error message and then a short time later process a completed request that you just told the user had failed! You could code for this possibility too and avoid it with a system of status flags, but hopefully you see that in any case, this simply isn t a robust error-handling mechanism Even with Ext JS in the mix, it can t overcome the underlying limitation of the <script> tag injection technique that underlies ScriptTagProxy So, as an FYI, in this application I took the tact that because the error-handling scheme is pretty poor anyway, I simply went with none at all no timer tricks, nothing.

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