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How to check a not-defined variable in JavaScript
...nly be done with try/catch, since typeof will treat an undeclared variable and a variable declared with the value of undefined as equivalent.
But, to check if a variable is declared and is not undefined:
if (yourvar !== undefined) // Any scope
Previously, it was necessary to use the typeof opera...
Windows Forms - Enter keypress activates submit button?
How can I capture enter keypresses anywhere on my form and force it to fire the submit button event?
9 Answers
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Compare two folders which has many files inside contents
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To get summary of new/missing files, and which files differ:
diff -arq folder1 folder2
a treats all files as text, r recursively searched subdirectories, q reports 'briefly', only when files differ
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Ruby ampersand colon shortcut [duplicate]
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Your question is wrong, so to speak. What's happening here isn't "ampersand and colon", it's "ampersand and object". The colon in this case is for the symbol. So, there's & and there's :foo.
The & calls to_proc on the object, and passes it as a block to the method. In Rails, to_proc is im...
Keeping it simple and how to do multiple CTE in a query
I have this simple T-SQL query, it emits a bunch of columns from a table and also joins information from other related tables.
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Error starting jboss server
I've just finished re-installing my OS, and as always install and test standard tools which I use, and now I get this error like never before when I tried to start Jboss 5 from eclipse, its quite big exeption :
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CSS “color” vs. “font-color”
... {
border: 1px solid;
color: red;
}
Yields both a red font color and a red border.
Alternatively, it could just be that the W3C's CSS standards are completely backwards and nonsensical as evidenced elsewhere.
shar...
Referenced Project gets “lost” at Compile Time
I have a C# solution with two projects: a service (the main project) and a logger. The service uses classes from the logger. I've added a Reference to the logger project within the service project. At design time, autocomplete works fine: the logger's classes are visible, references that I use are c...
Reset all changes after last commit in git
...the last commit, including deleting added files, resetting modified files, and adding back deleted files?
3 Answers
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Javascript date.getYear() returns 111 in 2011? [duplicate]
... have this javascript for automatically setting a date filter to the first and last day of the previous month:
3 Answers
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