Possible Duplicate:
What does !! mean in ruby?
Ruby, !! operator (a/k/a the double-bang)
Sometimes I see a Ruby code like this
def sent?
!!@sent_at
end
It seems to be not logical. Is it necessary to use here double !? As far as I'm concerned, it might be just
def sent?
@sent_at
end
UPDATE: then what is the difference between these
def sent?
!!@sent_at
end
def sent?
@sent_at.nil?
end
def sent?
@sent_at == nil
end
Hello there, I have a div with id kGrowl and inside that div I have a select element with name = mover. I try to use this selector:
$('#kGrowl:contains([name=mover])').length
But it is currently returning 0. How is my selector wrong?
Thanks.
I'm just getting my head around java (and OOP for that matter), the only thing I am familiar with is MySQL. I need to keep the DB connection open throughout the duration of the application, as well as a server socket.
I'm not even sure if they both need separate classes, but here's what I have so far:
http://pastebin.com/qzMFFTrY
(it wouldn't all go in a code tag)
The variable I need is con for line 86.
Hi,
I have a problem with JQuery Context Menu ( link text ) and iframe.
If i use it inside, the context menu is naturaly shown inside. But it will be partialy shown.
I am searching how to resolve it.
Please note that the context menu only appear when i click on specific iframe's elements.
thanks :)
I need a way to get user home directory in C++ program running on Linux. If the same code works on Unix, it would be nice. I don't want to use HOME environment value.
AFAIK, root home directory is /root. Is it OK to create some files/folders in this directory, in the case my program is running by root user?
Hi Folks,
Trying to debug something that basically .trim()'s, .val()'s and .length's a textarea input as HTML below (truncated):
<form id="Kontaktanfrage" method="post" action="tests/testform/">
...
<textarea cols="50" rows="8" id="el_12" name="FORM[Kontaktanfrage][el_12]" title="Ihre Nachricht: *" class="textarea required"></textarea>
...
</form>
JavaScript:
function validateField(formId, fieldId) {
if (fieldId) {
var element = "form#"+formId+" input#"+fieldId;
var fieldValue = jQuery.trim(jQuery(element).val());
var fieldLength = fieldValue.length;
var fieldError = "";
if ($(element).is('.textarea.required') && fieldLength == 0) {
fieldError = "error message";
}
}
}
The above if check is never true.
Using JQuery: 1.4.1.
Having seen other examples online, I can't see what the difference should be. Feel free to test it in FireBug at (http://www.initiat.de/tests/testform/). Any help appreciated, can't see what I'm doing wrong.
Hello, is there a good regex expression that would be able to compare two dates
like 3/27/2010 to 3/8/2010 to tell if the first date is greater then the second date?
I'd like to compare using javascript
in R , when i use "print", i can see all the values, but how can i save this as a vector
for example, in for loop,
for (i in 1:10), i want the value of A , when i= 1,2,3,4..... but if i use the x=A, it only have the final value of A which is the value when i = 10. so , how can i save the vaule in print(A)
I'd like everything to function correctly, except when it's mobile, the entire site will used a set of specific templates.
Also, I'd like to autodetect if it's mobile. If so, then use that set of templates throughout the entire site.
I've seen this all over the web
javascript:__doPostBack('ctl00$ContentPlaceHolder1$lnk2','')
Checking headers of the last place I saw it didn't reveal a server side language.
What server side language and/or framework encourages this style of link?
Greetings.
I am querying tables from Microsoft SQL 2008 which have date split across 3 columns: day, month and year. Unfortunately, I do not have control over this because data is coming in to the database daily from a 3rd party source in that format.
I need to add between to a where clause so user can pull records within a range. Would be easy enough if date was in a single column but finding it nearly impossible when its split across three columns.
To display the date, I am doing a
CAST(
CAST(year as varchar(4)) + '-' +
CAST(month as varchar(2)) + '-' +
CAST(day as varchar(2))
as date) AS "date"`
in a select. I tried to put it as a parameter for datediff function or just the regular between but get no results.
Thanks for any help.
sorry, im sure this is asked a bunch, but i couldnt find it.
in myModule.py:
from myModule.subModule import myClass
i am working on myClass, and want to stay in my ipython session and test it. reload(myModule) doesnt re-compile myClass.
how can i do this?
I have noticed that the quality of the images produced by the JPEGEncoder does not match that of other encoders available (i.e. php's built in image compression functions from the gd library)
Any explanation ? or hints/workarounds for improving the quality of compressed images by JPEGEncoder ??
Suppose I have this:
<select id="myselect">
<option rel="a">1</option>
<option rel="b">2</option>
<select>
How do I use JQuery so that onchange $("#myselect"), I alert the "rel" part of the option (not 1 or 2)
I have a search engine that searches albums.
For each music album, I have a page.
So, the work flow goes like this:
People search for music titles
The search engine displays a list of albums.
People click on an album to go to a details page.
I want google to index my front page and the details page. I want the details page to be highly ranked. How can I build a sitemap for this?
By the way, I have about 5 million albums (but I want the top 1000 ones to be highly ranked on google)
With a long but plain html document opened on a mobile device (webkit), how do I ensure that text doesn't crop vertically when scrolling?
I think this should be possible by either adjusting line spacing or adding extra padding.
TIA.
d3 = dict(d1, **d2)
I understand that this merges the dictionary. But, is it unique? What if d1 has the same key as d2 but different value? I would like d1 and d2 to be merged, but d1 has priority if there is duplicate key.
| random_code | varchar(200) | YES | UNI | NULL | |
MyTable.objects.filter(random_code = None)
Is this correct? Will this SELECT where there is no random code set? Above is my table.