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Articles indexed Saturday March 13 2010

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  • Jquery .text() call returns null?

    - by Alex
    Hey all, I'm practicing Jquery and I've written this simple Jquery statement: var someText = $("table tr td").text(); Should this not return all text of td elements found within tr's that are found within tables? How do I fix this? Currently when I run this, it says that table tr td is null, but I have a table on the page I'm testing on. Thanks!

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  • Would this hack for per-object permissions in django work?

    - by Edward
    According to the documentation, a class can have the meta option permissions, described as such: Options.permissions Extra permissions to enter into the permissions table when creating this object. Add, delete and change permissions are automatically created for each object that has admin set. This example specifies an extra permission, can_deliver_pizzas: permissions = (("can_deliver_pizzas", "Can deliver pizzas"),) This is a list or tuple of 2-tuples in the format (permission_code, human_readable_permission_name). Would it be possible to define permissions at run time by: permissions = (("can_access_%s" % self.pk, / "Has access to object %s of type %s" % (self.pk,self.__name__)),) ?

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  • Limiting the size of a python dictionary

    - by anthony
    I'd like to work with a dict in python, but limit the number of key/value pairs to X. In other words, if the dict is currently storing X key/value pairs and I perform an insertion, I would like one of the existing pairs to be dropped. It would be nice if it was the least recently inserted/accesses key but that's not completely necessary. If this exists in the standard library please save me some time and point it out!

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  • What is a columnar database?

    - by Raj More
    I have been working with warehousing for a while now. I am intrigued by Columnar Databases and the speed that they have to offer for data retrievals. I have multi-part question: How do Columnar Databases work? How do they differ from relational databases? Is there a trial version of a columnar database I can install to play around? (I am on Windows 7)

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  • Asynchronous PHP calls?

    - by UltimateBrent
    Is there a way to PHP make asynchronous http calls? I don't care about the response, I just want to do something like file_get_contents(), but not wait on the request to finish before executing the rest of my code. This would be super useful for setting off "events" of a sort in my application, or triggering long processes. Any ideas?

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  • Java NullPointerException. Why?

    - by user292844
    I am new to Java. I just read that class variables in Java have default value. I tried the following program. I was expecting to get the output as 0, which is the default value on an integer, but I get the NullPointerException. What am I missing? class Test{ static Integer iVar; public static void main(String...args) { System.out.println(iVar.intValue()); } }

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  • How to show printer properties/preferences dialog and save changes?

    - by Patrick Klug
    I can't figure out how to properly show the printer preference dialog of a given printer so that the user can change the printer settings. Most of the examples that I can find online manage to show the dialog but any changes the user might make are lost which makes it useless. Example: http://www.codeproject.com/KB/system/PrinterPropertiesWindow.aspx (I tried to change the code as suggested by BartJoy but that didn't fix it) Does anyone know how to do this properly?

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  • How do Scala parser combinators compare to Haskell's Parsec?

    - by artif
    I have read that Haskell parser combinators (in Parsec) can parse context sensitive grammars. Is this also true for Scala parser combinators? If so, is this what the "into" (aka "") function is for? What are some strengths/weaknesses of Scala's implementation of parser combinators, vs Haskell's? Do they accept the same class of grammars? Is it easier to generate error messages or do other miscellaneous useful things with one or the other? How does packrat parsing (introduced in Scala 2.8) fit into this picture? Is there a webpage or some other resource that shows how different operators/functions/DSL-sugar from one language's implementation maps onto the other's?

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  • remove specific field after clicking back in browser or using history.go(-1)

    - by Y.G.J
    i have a form with a capacha, if the capacha was entered wrong, after submit the page is doing a "history.go(-1)" and all fields include the capacha input are back on the screen right now i have a js that clear that - but now that i need it in several places, i want to know if it possible to clear a form field after back with something related to the html form or what ever thanks

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  • What are the issues when installing PEAR on Windows XP?

    - by paulhomebus
    I have a problem using the CLI with PEAR in a WAMP environment, I have tried different ways of getting pear to run in CLI but it doesn't want to go, I even have tried making a pear.bat file that points to the pear.bat file, using "%1 %2 %3" to capture extra info... I want to know what does the file called PEAR_ENV.reg do? It is mentioned in many places (forums, blogs etc) to set your environment variables so that you can use pear from CLI.

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  • Which MySQL Frontend shows foreign rows?

    - by Jeremy Rudd
    I once came across a MySQL Frontend app that displayed foreign linked rows within the parent row, if for instance the Events table has a foreign key to the Students table: Student ID Name DOB -- ---- --------- [+] 22 Bob 25-1-1984 [-] 21 Jane 25-1-1982 Event ID Student-ID Name Time -- ---------- ---- --------- 1 21 Event A 05:50 1 21 Event B 17:20 [+] 20 Jack 25-1-1980

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  • ABMultiValueCopyValueAtIndex gives message sent to deallocated instance.

    - by Mohammed Sadiq
    HI , I am getting a issue when trying to access the kABPersonInstantMessageProperty. The code is as follows : ABMultiValueRef IMS = ABRecordCopyValue(record, kABPersonInstantMessageProperty); CFRetain(IMS); if(IMS) { int IMSCount = ABMultiValueGetCount(IMS); MWLOG(5, @"**** IMS COunt **** : %d", IMSCount); for(int iIM =0; iIM < IMSCount; ++iIM) { MWLOG(5, @"index *** : %d", iIM); CFDictionaryRef dict = ABMultiValueCopyValueAtIndex(IMS, iIM); NSString* label = (NSString*)ABMultiValueCopyLabelAtIndex(IMS, iIM); NSString* service= (NSString*)CFDictionaryGetValue(dict, kABPersonInstantMessageServiceKey); NSString* username= (NSString*)CFDictionaryGetValue(dict, kABPersonInstantMessageUsernameKey); if(label) CFRelease(label); if(service) CFRelease(service); if(username) CFRelease(username); if(dict) CFRelease(dict); } CFRelease(IMS); } But I am getting the following error in console : 2010-03-13 12:39:16.731 mwp[1464:4f0b] * -[CFString retain]: message sent to deallocated instance 0x1582820 2010-03-13 12:49:12.219 mwp[1464:4f0b] * -[CFString _cfTypeID]: message sent to deallocated instance 0x15f0bf0 The stacktrace in the debugger is as follows : **#0 0x3026e017 in forwarding #1 0x3024a0a2 in __forwarding_prep_0___ *#2 0x30201368 in CFRetain * #3 0x325bdb6d in ABCCopyDictionaryWithTypes #4 0x325bdbe3 in ABCMultiDictionaryCreateCopy Is that the issue is with the api. I searched in the net but could nt find any solutions. I am getting this issue only in reading the InstantMessageProperty. Any help would be greatly appreciated .... Best Regards, Mohammed Sadiq.

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  • What 20 Lines (or less) of code did you find really useful?

    - by Ygam
    You can share your code or other's code. Here's a snippet from an array function in Kohana: public static function rotate($source_array, $keep_keys = TRUE) { $new_array = array(); foreach ($source_array as $key => $value) { $value = ($keep_keys === TRUE) ? $value : array_values($value); foreach ($value as $k => $v) { $new_array[$k][$key] = $v; } } return $new_array; } It was helpful when I was uploading multiple images using multiple file upload forms. It turned this array array('images' => array( 'name' => array( 0 => 'img1', 1 => 'img0', 2 =>'img2' ), 'error' => array( 0 => '', 1 => '', 2 => '' into : array('images' => array( 0 => array( 'name' => 'img1' 'error' => '' ),//rest goes here How about you? What 20 or less lines of code did you find useful?

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  • Looking for a file database

    - by Mitchell Skurnik
    A few years ago there was a PHP script around called paFileDB. Essentially it created a database of files that end users could download and rate. It would keep track of the number of downloads as well. I am looking for a replacement of this coded in ASP.net C#. For the last week I have been searching around for "asp.net C# file database" and have just gotten how to upload files to a database. I have also search with some other terms. I do not need a full blown CMS like DotNetNuke or SharePoint. All I have been looking for is a system I could easily add to my existing .net C# site. I have thought about coding one myself, but with me being rather busy at work and this being a personal project, I simply do not have the time to code this myself. I hope that you guys can help. Thank you!

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  • Tools to work with App Engine data dumps

    - by Thilo
    Using the bulkloader.py utility you can download all data from your application's Datastore. It is not obvious how the data is stored, however. From the looks of it, you get a SQLite file with all data in binary format in a single table: sqlite> .tables bulkloader_database_signature result sqlite> .schema result CREATE TABLE result ( id BLOB primary key, value BLOB not null, sort_key BLOB); Are there any tools to work with this data?

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  • Understanding Linker Map File (MS Visual Studio 2005)

    - by jeshop
    All - I'm trying to understand the first section of the Map file produced by the MS Visual Studio 2005 linker. I know it has something to do with memory sections, but can someone help me decipher it? Timestamp is 4b4f8d2b (Thu Jan 14 14:31:23 2010) Preferred load address is 00400000 Start Length Name Class 0001:00000000 0028b752H .text CODE 0002:00000000 000001b4H .idata$5 DATA 0002:000001b4 00000004H .CRT$XCA DATA 0002:000001b8 00000004H .CRT$XCAA DATA 0002:000001bc 00000004H .CRT$XCC DATA 0002:000001c0 00000004H .CRT$XCZ DATA 0002:000001c4 00000004H .CRT$XIA DATA 0002:000001c8 00000004H .CRT$XIAA DATA 0002:000001cc 00000004H .CRT$XIC DATA 0002:000001d0 00000004H .CRT$XIZ DATA 0002:000001d8 00025288H .rdata DATA 0002:00025460 00000004H .rdata$sxdata DATA 0002:00025464 00000004H .rtc$IAA DATA 0002:00025468 00000004H .rtc$IZZ DATA 0002:0002546c 00000004H .rtc$TAA DATA 0002:00025470 00000004H .rtc$TZZ DATA 0002:00025478 0000007cH .xdata$x DATA 0002:000254f4 00000028H .idata$2 DATA 0002:0002551c 00000014H .idata$3 DATA 0002:00025530 000001b4H .idata$4 DATA 0002:000256e4 00000542H .idata$6 DATA 0002:00025c26 00000000H .edata DATA 0003:00000000 000f070cH .data DATA 0003:000f0720 001f1280H .bss DATA

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  • what are the difficulties of operating system multithreading?

    - by ghedas
    I am reading a book that compares two ways of implementing threads, Middleware Threads and OS Threads. I have a question about these sentences: "A difficulty of operating system multithreading, however, is performance overhead. Since it is the operating system that is involved in switching threads, this involves system calls. These are generally more expensive than thread operations executed at the user level, which is where the transactional middleware is operating."

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  • WCF REST RestChess.com

    - by conradt
    I saw a few WCF REST presentations referencing source code at restchess.com. Unfortunately, that website is not available anymore. Does anyone know where else I can can go to download the source code?

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  • Tab bar in a View instead of Window

    - by kayue
    Is it possible to use tab bar in a view instead of window? Seems everyone add tab bar to their window. My first screen is a login screen, which doesn't need tab bar. After user login, it change to the second screen, which contain a tabbar. Thank you for your time :)

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  • Silverlight datagrid don't show any data with anonymous query RIA services

    - by user289082
    Hi all! I have an anonymous linq query that I bind to a datagrid, when I debug it brings alright the data but it doesn't show in the datagrid, I suspect that the request to RIA services isn't completed before I bound it to the datagrid. I could use the LoadOperation<() Completed event. But it only works with Defined Entities so how can I do that? For reference here is the last post: http://stackoverflow.com/questions/2403903/linq-query-null-reference-exception Here is the query: var bPermisos = from b in ruc.Permisos where b.IdUsuario == SelCu.Id select new { Id=b.Id, IdUsuario=b.IdUsuario, IdPerfil=b.IdPerfil, Estatus=b.Estatus, Perfil=b.Cat_Perfil.Nombre, Sis=b.Cat_Perfil.Cat_Sistema.Nombre }; I'm a totally newbie sorry if is a very simple question. Thanks!!

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  • Check for Block Ads/Scripts (Browser Addons, Compatibility)

    - by acidzombie24
    I'm conflicted. you guys decide if this should migrate to SU or not. I would like to test my site against popular browser ad ons. ATM i have tested against noscript and adblock plus for firefox. What other popular ad ons should i check compatibility with? By compatibility i mean to work as intent on browsers i support (opera, firefox, chrome, IE 7/8) which include ads. NoScript broke my site and for adblock plus i ask once per week to consider allowing ads. When i see IE6 i notify the user the site is known to be unusable with that browser (The site is script heavy by nature and i wouldnt want to accidentally serve ads to infect users of IE6 with a virus).

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