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  • Double "!!" in Ruby [closed]

    - by Alex Maslakov
    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

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  • Java / MySQL - How to access connection from another class?

    - by Alex
    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.

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  • Get home directory in Linux, C++

    - by Alex Farber
    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?

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  • javascript context menu in iframe

    - by alex
    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 :)

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  • in R, how can i save the value of "print"

    - by alex
    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)

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  • Using jQuery :contains selector

    - by Alex
    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.

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  • JQuery validation using is() and multiple CSS classes

    - by Alex
    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.

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  • compare date split across colums

    - by alex-tech
    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.

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