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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...
Tool to read and display Java .class versions
Do any of you know of a tool that will search for .class files and then display their compiled versions?
9 Answers
...
Center content in responsive bootstrap navbar
...ng for. You need to remove the float: left from the inner nav to center it and make it a inline-block.
.navbar .navbar-nav {
display: inline-block;
float: none;
vertical-align: top;
}
.navbar .navbar-collapse {
text-align: center;
}
http://jsfiddle.net/bdd9U/2/
Edit: if you only want th...
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
...
How can I convert a character to a integer in Python, and viceversa?
...
Use chr() and ord():
>>> chr(97)
'a'
>>> ord('a')
97
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Compare two folders which has many files inside contents
...
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.
...
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 :
...
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...