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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(...
How do I remove  from the beginning of a file?
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Open your file in Notepad++. From the Encoding menu, select Convert to UTF-8 without BOM, save the file, replace the old file with this new file. And it will work, damn sure.
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Removing pip's cache?
...urge removes all the wheel files in the cache.
pip cache remove matplotlib selectively removes files related to a matplotlib from the cache.
In summary, pip provides a lot of ways to tweak how it uses the cache:
pip install --no-cache-dir <package>: install a package without using the cache...
Where does Chrome store extensions?
...a reference to its local paths, they are left in the place where there are selected from in all Operating Systems.
Ex: If i load a unpacked Extension from E:\Chrome Extension the unpacked Extension is still in the same location
Storage Location for Packed Extensions
Navigate to chrome://version/ ...
How to delete last character in a string in C#?
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build it with string.Join instead:
var parameters = sl.SelProds.Select(x=>"productID="+x.prodID).ToArray();
paramstr = string.Join("&", parameters);
string.Join takes a seperator ("&") and and array of strings (parameters), and inserts the seperator between each element of th...
How to change SmartGit's licensing option after 30 days of commercial use on ubuntu?
...d just delete that object. Of course only do this if you have accidentally selected commercial and you are genuinely a personal user
– user3265561
Jul 11 '16 at 12:42
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PHP date() format when inserting into datetime in MySQL
...FROM_UNIXTIME(1231634282));
Query OK, 1 row affected (0.00 sec)
mysql> select * from a_table;
+---------------------+
| a_date |
+---------------------+
| 2009-01-10 18:38:02 |
+---------------------+
shar...
Eclipse: have the same file open in two editors?
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Right click on your editor tab and select "New Editor".
... unless you have a newer version of eclipse, in which case do Window -> New Editor.
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How to easily truncate an array with JavaScript?
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If you want to selectively pull elements out of an array, you can use the jQuery.grep method.
(from the jQuery docs)
var arr = [ 1, 9, 3, 8, 6, 1, 5, 9, 4, 7, 3, 8, 6, 9, 1 ];
$("div").text(arr.join(", "));
arr = jQuery.grep(arr, functi...
Preventing console window from closing on Visual Studio C/C++ Console application
...ct
Properties > Configuration Properties > Linker > System
Select Console (/SUBSYSTEM:CONSOLE) in SubSystem option or you can just type Console in the text field!
Now try it...it should work
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