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• What's the best way to return stuff from a PHP function, and simultaneously trigger a jQuery action?

  - by Jack Webb-Heller

  So the title is a tad ambiguous, but I'll try and give an example. Basically, I have an 'awards' system (similar to that of StackOverflow's badges) in my PHP/CodeIgniter site, and I want, as soon as an award is earned, a notification to appear to the user. Now I'm happy to have this appear on the next page load, but, ideally I'd like it to appear as soon as the award is transactioned since my site is mostly Ajax-powered and there may not be page reloads very often. The way the system works currently, is: 1) If the user does something to trigger the earning of an award, CodeIgniter does this: $params['user_id'] = $this->tank_auth->get_user_id(); $params['award_id'] = 1; // (I have a database table with different awards in) $this->awards->award($params); 2) My custom library, $this->awards, runs the award function: function award($params) { $sql = $this->ci->db->query("INSERT INTO users_awards (user_id, award_id) VALUES ('".$params['user_id']."','".$params['award_id']."') ON DUPLICATE KEY UPDATE duplicate=duplicate+1"); $awardinfo = $this->ci->db->query("SELECT * FROM awards WHERE id = ".$params['award_id']); // If it's the 'first time' the user has gotten the award (e.g. they've earnt it) if ($awardinfo->row('duplicate') == 0) { $params['title'] = $awardinfo->row('title'); $params['description'] = $awardinfo->row('description'); $params['iconpath'] = $awardinfo->row('iconpath'); $params['percentage'] = $awardinfo->row('percentage'); return $params; } } So, it awards the user (and if they've earnt it twice, updates a useless duplicate field by one), then checks if it's the first time they've earnt it (so it can alert them of the award). If so, it gets the variables (title of the award, the award description, the path to an icon to display for the award, and finally the percentage of users who have also got this award) and returns them as an array. So... that's that. Now I'd like to know, what's the best way to do this? Currently my Award-giving bit is called from a controller, but I guess if I want this to trigger via Ajax, then the code should be placed in a View file...? To sum it up: I need the returned award data to appear without a page refresh. What's the best way of doing this? (I'm already using jQuery on my page). Thanks very much everybody! Jack

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• Is there a javascript function that can pad a string to get to a determined length?

  - by Anthony Potts

  I am in need of a javascript function which can take a value and pad it to a given length (I need spaces, but anything would do). I found this: http://jsfromhell.com/string/pad But I have no idea what the heck it is doing and it doesn't seem to work for me.

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• Django: How do I access the request object or any other variable in a form's clean() method?

  - by nubela

  I am trying to request.user for a form's clean method, but how can I access the request object? Can I modify the clean method to allow variables input? Thanks.

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• Back-to-back ajax long poll without a recursive callback function.

  - by Teddy

  I'm trying to make long poll ajax calls, back to back. The problem with the current way I'm doing it is that I make each successive call from the callback function of the previous call. Is this a problem? Firebug doesn't show any of my ajax calls as completed, even thought the data is returned and the callback is executed. The recursive structure seems inefficient. Any ideas?

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• How can you tell if an XMLlist object in AS3 contains a node?

  - by Dimitree

  How can you tell if an XMLlist object in AS3 contains a specific node? For ex: you have this XML file <items> <item>one</items> </items> And want to check if in this file exists a child with tag ?

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• How to define an extern, C struct returning function in C++ using MSVC?

  - by DK

  The following source file will not compile with the MSVC compiler (v15.00.30729.01): /* stest.c */ #ifdef __cplusplus extern "C" { #endif struct Test; extern struct Test make_Test(int x); struct Test { int x; }; extern struct Test make_Test(int x) { struct Test r; r.x = x; return r; } #ifdef __cplusplus } #endif Compiling with cl /c /Tpstest.c produces the following error: stest.c(8) : error C2526: 'make_Test' : C linkage function cannot return C++ class 'Test' stest.c(6) : see declaration of 'Test' Compiling without /Tp (which tells cl to treat the file as C++) works fine. The file also compiles fine in DigitalMars C and GCC (from mingw) in both C and C++ modes. I also used -ansi -pedantic -Wall with GCC and it had no complaints. For reasons I will go into below, we need to compile this file as C++ for MSVC (not for the others), but with functions being compiled as C. In essence, we want a normal C compiler... except for about six lines. Is there a switch or attribute or something I can add that will allow this to work? The code in question (though not the above; that's just a reduced example) is being produced by a code generator. As part of this, we need to be able to generate floating point nans and infinities as constants (long story), meaning we have to compile with MSVC in C++ mode in order to actually do this. We only found one solution that works, and it only works in C++ mode. We're wrapping the code in extern "C" {...} because we want to control the mangling and calling convention so that we can interface with existing C code. ... also because I trust C++ compilers about as far as I could throw a smallish department store. I also tried wrapping just the reinterpret_cast line in extern "C++" {...}, but of course that doesn't work. Pity. There is a potential solution I found which requires reordering the declarations such that the full struct definition comes before the function foward decl., but this is very inconvenient due to the way the codegen is performed, so I'd really like to avoid having to go down that road if I can.

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• Spring batch datareader returns extra null object on end of collection of read items?

  - by tll

  I'm using Spring batch - using datareaders to load up lists of items. For each of my readers, they all return an extra null object on the end of the list. Has anybody seen this before? What am I doing wrong?

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• calculate the distance between the place where I am taking photo and the object I am taking.

  - by ZHAO Xiaojian

  I can get the latitude and longitude where I am taking photo. I can also get the Exif information of the photo I took. I want to know how can I calculate the distance between the place I am taking photo and the object I am taking by above informations? give me some constructive opinions. thanks very much.

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• C# 4 default parameter values: How to assign a default DateTime/object value?

  - by Dr. Zim

  If DateTime is an object and default C# parameters can only be assigned compile-time constants, how do you provide default values for objects like DateTime? I am trying to initialize values in a POCO with a constructor, using named parameters with default values.

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• Is it safe to access asp.net session variables through static properties of a static object?

  - by Ronnie Overby

  Is it safe to access asp.net session variables through static properties of a static object? Here is what I mean: public static class SessionHelper { public static int Age { get { return (int)HttpContext.Current.Session["Age"]; } set { HttpContext.Current.Session["Age"] = value; } } public static string Name { get { return (string)HttpContext.Current.Session["Name"]; } set { HttpContext.Current.Session["Name"] = value; } } } Is it possible that userA could access userB's session data this way?

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• Get String in YYYYMMDD format from JS date object?

  - by IVR Avenger

  Hi, all. I'm trying to use JS to turn a date object into a String in YYYMMDD format. Is there an easier way than concatenating Date.getYear() Date.getMonth(), and Date.getDay()? Thanks, IVR Avenger

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• Why do we have contains(Object o) instead of contains(E e)?

  - by Vivin Paliath

  Is it to maintain backwards compatibility with older (un-genericized) versions of Collection? Or is there a more subtle detail that I am missing? I see this pattern repeated in remove also (remove(Object o)), but add is genericized as add(E e).

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• who can tell me how to training a kind of object in the picture ?

  - by carl

  I want to detect one kind of object such as person in the picture, who can tell me how to training a kind of people classifier for use,so we can use the classifier to detect people in any picture.

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• How can I specify how many levels deep the timespan() function in Codeigniter should go?

  - by Shamoon

  I'm using Codeigniter's "timespan()" function to give a human readable phrase of how much time has elapsed since an event: "5 days, 3 hours, 12 minutes, 1 second", but I don't need to go down to the minute or second level. Is there any way to turn that off?

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• Given a property, how to find to which object the property belongs?

  - by Paul

  I've got a few DOM elements, say text-field input A, B, C, and all of them have the property of 'onclick'. How do I find to which object a particular 'onclick' belongs?

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• Can I automatically insert all members of a object somehow in Visual Studio?

  - by joeriks

  I like to insert all members of a object automatically, so I dont need to type them (or even click them). Ctrl+J gives me the dropdown, but I like them all in code with a default value, MyObject.Member1=0; MyObject.Member2=""; MyObject.Member3=0; Any Add-In or existing shortcut that can help me with that?

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• Should I add try/catch around when casting on an attribute of JSP implicit object?

  - by Michael Mao

  Hi all: Basically what I mean is like this: List<String[]> routes = (List<String[]>)application.getAttribute("routes"); For the above code, it tries to get an attribute named "routes" from the JSP implicit object - application. But as everyone knows, after this line of code, routes may very well contains a null - which means this application hasn't got an attribute named "routes". Is this "casting on null" good programming practice in Java or not? Basically I try to avoid exceptions such as java.io.InvalidCastException I reckon things like this are more as "heritage" of Java 1.4 when generic types were not introduced to this language. So I guess everything stored in application attributes as Objects (Similar to traditional ArrayList). And when you do "downcast", there might be invalid casts. What would you do in this case? Update: Just found that although in the implicit object application I did store a List of String arrays, when I do this : List<double[]> routes = (List<double[]>)application.getAttribute("routes"); It doesn't produce any error... And I felt not comfortable already... And even with this code: out.print(routes.get(0)); It does print out something strange : [Ljava.lang.String;@18b352f Am I printing a "pointer to String"? I can finally get an exception like this: out.print(routes.get(0)[1]); with error : java.lang.ClassCastException: [Ljava.lang.String; Because it was me to add the application attribute, I know which type should it be cast to. I feel this is not "good enough", what if I forget the exact type? I know there are still some cases where this sort of thing would happen, such as in JSP/Servlet when you do casting on session attributes. Is there a better way to do this? Before you say:"OMG, why you don't use Servlets???", I should justify my reason as this: - because my uni sucks, its server can only work with Servlets generated by JSP, and I don't really want to learn how to fix issues like that. look at my previous question on this , and this is uni homework, so I've got no other choice, forget all about war, WEB-INF,etc, but "code everything directly into JSP" - because the professors do that too. :)

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• Parsing an xs:duration datatype into a Python datetime.timedelta object?

  - by Rezzie

  As per the title, I'm trying to parse an XML file containing an xs:duration data type. I'd like to convert that into a Python timedelta object, which I can then use in further calculations. Is there any built-in way of doing this? If not, what is the best way to achieve this?

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• How to implement a timeout in read function call?

  - by sasayins

  Hi, I want to use serial com port for communication and I want to implement a timeout every time I call the read function call. int filedesc = open( "dev/ttyS0", O_RDWR ); read( filedesc, buff, len ); Thanks

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• What should the retainCount be when returning an object in Objective-C?

  - by Yakattak

  See title. To be more specific, I am trying to return the mutableCopy of an object, however it's returned with a retainCount of 1 and I am worrying that it will leak.

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• Can I get an arithmetic expression as a string computed with the Javascript Math object?

  - by chimerical

  If I have an arithmetic expression as a string ("2+3*4/5"), is there a way to get this computed with the Javascript Math object without parsing that entire string to separate everything out?

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• Can I debug multiple instances of a same object that is of type thread with GDB?

  - by yan bellavance

  program runs fine. When I put a breakpoint a segmentation fault is generated. Is it me or GDB? At run time this never happens and if I instantiate only one object then no problems. Im using QtCreator on ubuntu x86_64 karmic koala.

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• Is there a naming convention for a method that should set the properties of the passed object.

  - by Genady Sergeev

  Hello, I am writing a method that will set the properties of an object passed as a parameter. The method accepts one parameter of type interface and the return type of the method is the same interface. I was wondering if there is some kind of a naming convention for such methods. I was thinking of something like: FillInInterfaceTypeData or InitInterfaceTypeData but both sound clumsy to me. How do you think?

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• How does EJB home object reference knows the server details to which it should connect ?

  - by Jijoy

  Hi , After I do a JNDI look up , what I get is a reference to the Home of EJB Object. But when I do an API call on Home/Remote , how does it find the URL/port of the server ? Thanks J

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• How can I send a json string to view as a json object?

  - by yapiskan

  I have a json string in an action of MVC controller. I want to send it to view as a JSON object. How can I solve this? public JsonResult Json() { ... some code here ... string jsonString = "{\"Success\":true, \"Msg\":null}"; return new JsonResult() { Data = jsonString, JsonRequestBehavior = JsonRequestBehavior.AllowGet }; }

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