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Whether a variable is undefined [duplicate]
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jQuery.val() and .text() will never return 'undefined' for an empty selection. It always returns an empty string (i.e. ""). .html() will return null if the element doesn't exist though.You need to do:
if(page_name != '')
For other variables that don't come from something like jQuery.val(...
Debugging doesn't start [closed]
...roperties -> Startup Project.
The ensuring Multiple startup projects is selected, move the web project to the top of the list.
In my web application solution I have 2 web projects and 5 code projects, one of my code projects was at the top, and as such debug would not start.
Hope others find ...
Where are the PostgreSQL logs on macOS?
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Just ask your database:
SELECT
*
FROM
pg_settings
WHERE
category IN( 'Reporting and Logging / Where to Log' , 'File Locations')
ORDER BY
category,
name;
In my case, it's in "/Library/PostgreSQL/8.4/data/pg_log"
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Virtualizing an ItemsControl?
...the sort of thing I was looking for! I was looking for a different kind of selection behavior than a listbox and at the time I thought it would be easiest to do with an items control.
– Rachel
May 7 '10 at 12:20
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Limit results in jQuery UI Autocomplete
...m a mysql query, it is more efficient to limit directly the mysql result:
select [...] from [...] order by [...] limit 0,10
where 10 is the max numbers of rows you want
Extreme wait-time when taking a SQL Server database offline
...s statistic update)
To find connections, use sys.sysprocesses
USE master
SELECT * FROM sys.sysprocesses WHERE dbid = DB_ID('MyDB')
To force disconnections, use ROLLBACK IMMEDIATE
USE master
ALTER DATABASE MyDB SET SINGLE_USER WITH ROLLBACK IMMEDIATE
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jQuery attr vs prop?
...ns (<1.6), we just had attr. To get to DOM properties such as nodeName, selectedIndex, or defaultValue you had to do something like:
var elem = $("#foo")[0];
if ( elem ) {
index = elem.selectedIndex;
}
That sucked, so prop was added:
index = $("#foo").prop("selectedIndex");
This was great, bu...
Entity Framework Timeouts
...istAsync();
}
Explanation:
Simply try to use Sql Profiler and check the Select statement generated by Entity frameeork. …
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character showing up in files. How to remove them?
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This solution worked for me. It is simpler than the selected answer. Thanks
– szydan
Nov 4 '14 at 10:04
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Go to back directory browsing after opening file in vim
...and press Enter, it does not work; if i open vim, then :e <dirname>, select file and Enter, it works. In both cases :buffers shows only one buffer. I'm not sure why it is so.
– mcmlxxxvi
Feb 5 '16 at 15:45
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