Difference between revisions of "Tutorials webOS Debugging 101"
m (Fixed some punctuation and spelling. Added <code> tags to commands that are to be issued in PuTTY.) |
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| − | If | + | If your results are not what you expected, use JavaScript's try/catch/finally block statements to localize the problem. The first thing you want to do is get as close as possible to where you believe the error is occurring. If you're not sure where, start at the beginning. |
| Line 13: | Line 13: | ||
<p>connection type: ssh</p> | <p>connection type: ssh</p> | ||
| − | <p>when command line opens type root</p> | + | <p>when command line opens, type <code>root</code></p> |
<p>no password just hit enter</p> | <p>no password just hit enter</p> | ||
| − | <p>type: cat /var/log/messages | grep payment</p> | + | <p>type: <code>cat /var/log/messages | grep payment</code></p> |
<p>"payment" is the string you are searching for with grep</p> | <p>"payment" is the string you are searching for with grep</p> | ||
<p>after you log in to putty:</p> | <p>after you log in to putty:</p> | ||
| − | <p> | + | <p>Mojo.Log.error writes to /var/log/messages</p> |
<p>cat: types the file out</p> | <p>cat: types the file out</p> | ||
Revision as of 20:09, 30 July 2010
If your results are not what you expected, use JavaScript's try/catch/finally block statements to localize the problem. The first thing you want to do is get as close as possible to where you believe the error is occurring. If you're not sure where, start at the beginning.
Add mojo.logs to your code and evaluate them in putty.
Mojo.Log.error("****V" + " my variable: " + this.variable );
putty.exe
(for emulator)
ip address "localhost" port 5522
connection type: ssh
when command line opens, type root
no password just hit enter
type: cat /var/log/messages | grep payment
"payment" is the string you are searching for with grep
after you log in to putty:
Mojo.Log.error writes to /var/log/messages
cat: types the file out
grep: searches it for the string following grep and prints out those lines
| (vertical bar): says pass the output of cat over to grep
SIDE NOTE: if you copy text into the clipboard, you can paste it into putty by right-clicking in putty.