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• Ruby On Rails: Ask for Confirmation When Table Entry Associated With Another Is Destroyed

  - by Train Main

  Hi all, I would like some assistance with the following problem: I have a table of groups that is self-associated with itself, so each group is (optionally) linked to another in a hierarchical fashion. I want to write some code that will somehow check before the destruction of a group entry, if it has any children, and ask the user for confirmation, or whether they wish to delete the child groups as well. I've looked at callbacks, but I don't know how to get the confirmation request to the end user in the view, and then get the response back to the model's callback. Thanks

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• Sync framework 2.0 smart device to server

  - by Oll

  We have a requirement very similar to that shown in the Occasionally Connected Application (OCA) diagram on the Introduction to Sync Framework Database Synchronization article. We can't however find any examples on how the clients at the bottom are syncing between each other. Particularly, how a smart device syncs with another client each having a local .sdf database. There are lots of examples of a smart device to a server over wcf where the server is running full sql but not smart device to server with local cache. Does anyone have any ideas or examples. Thanks

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• How to read a Dependency property from a method

  - by PaN1C_Showt1Me

  XAML: <my:Control ItemsSource="{StaticResource MySource}" A="true" /> Assume a Control with a dependency property A with a default value false; and a method to handle the Source Collection: protected override void OnItemsSourceChanged(System.Collections.IEnumerable oldValue, System.Collections.IEnumerable newValue) {} in which you want to look at A and readout its value (which is true). how would you ensure, that A is already initialized and has a given value? Or how should this be done correctly ? In my case A is something like AllowLateBinding .. Could coerce callback help me?

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• Extract data from uint8 to double

  - by HADJ AMOR HASSEN

  I have a C function receiving a uint8 pointer with another parameter which is its size (number of bytes). I want to extract double data from this buffer. Here is my code: Write(uint8* data, uint8 size) /* data and size are given by a callback to my function)*/ { double d; for (i = 0; i < size; i++) { d = ((double*)&data)[i]; printf(" d = %d\n"); } } The problem is that I am not receiving what I am sending within an external hardware. I guess that my cast is wrong. I tried other methods but without any good result. I am still not able to get what I send.

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• overriding callbacks avoiding attribute pollution

  - by pygabriel

  I've a class that has some callbacks and its own interface, something like: class Service: def __init__(self): connect("service_resolved", self.service_resolved) def service_resolved(self, a,b c): ''' This function is called when it's triggered service resolved signal and has a lot of parameters''' the connect function is for example the gtkwidget.connect, but I want that this connection is something more general, so I've decided to use a "twisted like" approach: class MyService(Service): def my_on_service_resolved(self, little_param): ''' it's a decorated version of srvice_resolved ''' def service_resolved(self,a,b,c): super(MyService,self).service_resolved(a,b,c) little_param = "something that's obtained from a,b,c" self.my_on_service_resolved(little_param) So I can use MyService by overriding my_on_service_resolved. The problem is the "attributes" pollution. In the real implementation, Service has some attributes that can accidentally be overriden in MyService and those who subclass MyService. How can I avoid attribute pollution? What I've thought is a "wrapper" like approach but I don't know if it's a good solution: class WrapperService(): def __init__(self): self._service = service_resolved # how to override self._service.service_resolved callback? def my_on_service_resolved(self,param): ''' '''

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• Gaining Reference to the Dialog from Dialog content

  - by coffeeaddict

  Here's my scenario: I've got a div on Page A. When an event happens (whatever I define, a click, whatever), I do a div.Dialog, set its properties and open it The data inside is returned from an async .ajax call that grabs the data from a url and appends it to the div by calling div.html(data) inside the .ajax callback, so it's essentially loading a PageB by getting the data (content) and appending it to the div that's calling the dialog("open")...nothing special here I don't think. My question: In Page B, how do I reference the dialog so I can do some things to it? For instance in Page B's content that I received back from that .ajax call and added to the div via .html(data), there is a button and when clicked I need to close the dialog. Right now my buttons are not working because one of them closes out the dialog and the other should redirect to a new page but both do not work now because I have no reference to the dialog that it's in to manipulate it.

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• Deployment process

  - by Balaji

  We are having a massive system having around 15 servers hosting .Net WCF services, mvc application etc. When we do a deployment (out of office hours) we have to uninstall and install everything on the live servers. This takes lot of time and if something goes wrong we have to rollback everything. can you please suggest something different to this? like Deply into a other environment (whenever you like) and switch the URL to point to new servers [This comes with the overhead of cost of maintaining 2 copies of production (active and passive)] any other ideas please.

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• Tabs.url is undefined

  - by Notionwork

  I have no clue what I'm doing wrong here! This should be working I believe. I'm writing a chrome extension and this should get the current tab's url and set the html of #current-tab to the url (for testing purposes). The code successfully gets to the callback, but it says that tab.url is undefined when I put it in an alert box, and it does not put it's value in #current-tab. Here's the code I have: $('#get-tab').click(function(){ chrome.tabs.query({"active" : true}, function(tab){ for (var i = 0; i < tab.length; i++) { alert(tab.url); $('#current-tab').append(tab.url); }; }); });

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• how do i get textfield value then combine with regex

  - by klox

  i have this code for get data from textfield: <script type="text/javascript"> var mod=document.getElementById("mod").value; ajax(mod); function callback() { if(ajaxObj(mod) { document.getElementById("divResult").innerHTML=ajaxObj.responseText; }); }; </script> and this one for search character: <script> var str="KD-R435MUN2D"; var matches=str.match(/([EJU]).*(D)/i); if (matches) { var firstletter = matches [1]; var secondletter = matches [2]; var thirdletter = matches [3]; alert(firstletter + secondletter + thirdletter); }else{ alert (":("); } </script> how to combine both?please help...

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• Java and C# : how to decide

  - by Andrea

  I'm working in a company where i work on environment. Net; I found another company that offered me a job where, however, programming in Java. I do not know Java and want to understand what are the differences. With the. NET framework I can build Windows Forms applications, web (asp.net and asp.net MVC), Silverlight (also for the 7 Series phones), WPF, WCF services and more and I have also Intellisense and ReSharper. In java? It 'a language that has a future? You what would you do? Thanks

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• Wordpress: Issues trying to display all comments in one page

  - by KeyStroke

  Hi, I'm trying to modify my wordpress theme (inove) to display all comments in the same page instead of 50 comments per page. I opened the comments.php file, commented out calls to paginate_comments_links() and and set the wp_list_comments() as follows: wp_list_comments('type=comment&callback=custom_comments&per_page=100&page=1'); The problem is, whenever someone posts a comments, the comment form appends '/comment-page-2/' to the URL after submitting the comment, even though I've specified that all comments to be displayed on the same page. Any idea what I could be missing? Appreciate your help

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• Implementing an ActiveRecord before_find

  - by thaiyoshi

  I am building a search with the keywords cached in a table. Before a user-inputted keyword is looked up in the table, it is normalized. For example, some punctuation like '-' is removed and the casing is standardized. The normalized keyword is then used to find fetch the search results. I am currently handling the normalization in the controller with a before_filter. I was wondering if there was a way to do this in the model instead. Something conceptually like a "before_find" callback would work although that wouldn't make sense on for an instance level.

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• finding last loop through a jQuery object

  - by DA

  Sample jquery. Assume $cog is a cached selector of multiple items. $cog.fadeOut('slow',function(){ alert('hey'); }) In that example, of $cog is a jQuery object of 4 DOM elements, the above will fade each element out one by one, and trigger an alert each time on the callback (4 alerts). I'd like to only call the alert when all 4 elements are done with their fadeOut function. This: $cog.fadeOut('slow',function(){ }) alert('hey'); when run, will show an alert, then the $cog elements disappear (I'm guessing due to timing issues with the fadeOut animation) Is there a way when calling a function against multiple DOM objects in a jQuery object to know when it's done with the last item?

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• Understanding memory leak in Android app.

  - by sat

  After going through few articles about performance, Not able to get this statement exactly. "When a Drawable is attached to a view, the view is set as a callback on the drawable" Soln: "Setting the stored drawables’ callbacks to null when the activity is destroyed." What does that mean, e.g. In my app , I initialize an imageButton in onCreate() like this, imgButton= (ImageButton) findViewById(R.id.imagebtn); At later stage, I get an image from an url, get the stream and convert that to drawable, and set image btn like this, imgButton.setImageDrawable(drawable); According to the above statement, when I am exiting my app, say in onDestroy() I have to set stored drawables’ callbacks to null, not able to understand this part ! In this simple case what I have to set as null ? I am using Android 2.2 Froyo, whether this technique is required, or not necessary.

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• Dart js.interop callbacks

  - by basheps

  How can I translate the following jquery code to Dart? I'm having difficulty getting the alert callback to work using js.interop. <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script> <script> $(function () { $('p').hide('slow', function() { alert("The paragraph is now hidden"); }); }); </script> Any help is appreciated.

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• Help with memory leak (malloc)

  - by user146780

  I'v followed a tutorial to use OGL tesselaton. In one of the callbacks there is a malloc and it creates a leak every time I render a new frame. void CALLBACK combineCallback(GLdouble coords[3], GLdouble *vertex_data[4], GLfloat weight[4], GLdouble **dataOut) { GLdouble *vertex; vertex = (GLdouble *) malloc(6 * sizeof(GLdouble)); vertex[0] = coords[0]; vertex[1] = coords[1]; vertex[2] = coords[2]; for (int i = 3; i < 6; i++) { vertex[i] = weight[0] * vertex_data[0][i] + weight[1] * vertex_data[0][i] + weight[2] * vertex_data[0][i] + weight[3] * vertex_data[0][i]; } *dataOut = vertex; } I'v tried to free(vertex) but then the polygons did not render. I also tried allocating on the heap then doing delete(vertex) but then the polygon rendered awkwardly. I'm not sure what to do. Thanks

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• jQuery Animation and Classes

  - by ehdv

  Assume you have a list item, <li id="foo"> which you want to fade from one color to another when moused over, and that you are using jQuery. This is fairly easy: $('li#foo').bind('mouseenter' , function(e) { $(this).animate({backgroundColor: '#F00'} , 300); }); However, what if you wanted to get the resulting color or other style rules from a class defined in CSS without also declaring them in JavaScript? It seems there's no way to learn style information from CSS rules without having an example of the rule already in the document, which would require you to animate the <li> to the target appearance, then in the animation-finished callback, set the class which leads to redundant style declarations and can foul up your CSS at "runtime". Sorry if this question's unclear: It doesn't occur in the context of any specific project, I'm just curious how you'd go about this. Also, I know CSS3 hypothetically includes support for such transitions but using CSS for dynamic behavior like this seems such an ugly hack.

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• JQuery - How do I count the number of elements selected by a selector?

  - by Josh

  I am using $().fadeOut() to fade items out in a list ( < li < /li). When the list is empty I wish to hide a parent object. I plan on doing this by checking in my trigger event that fades the list if the count of the objects is 0 then hide the parent element. I can use the fadeOut callback to remove the elements if necessary. The to the point question: How do I select li tags inside a ul and then get the total count of them using jquery?

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• Iterators over a LInked List in a Game in Java

  - by Matthew

  I am using OpenGl in android and they have a callback method called draw that gets called with out my control. (As fast as the device can handle if I am not mistaken) I have a list of "GameObjects" that have a .draw method and a .update method. I have two different threads that handle each of those. So, the question is, can I declare two different iterators in two different methods in two different threads that iterate over the same Linked List? If so, do I simply declare ListIterator<GameObject> l = objets.listIterator() each time I want a new iterator and it won't interfere with other iterators?

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• AJAX Closures and targeting 'this'

  - by Nick Lowman

  In the code example below the success callback function logs 'input#04.update' four times rather than each individual input, which makes sense seeing how closures work but how would I go about targeting each individual input using this. <input type="text" name="" id="01" class="update"> <input type="text" name="" id="02" class="update"> <input type="text" name="" id="03" class="update"> <input type="text" name="" id="04" class="update"> function updateFields(){ $('input.update').each(function(){ $this = $(this); $.ajax({ data: 'id=' + this.id, success: function(resp){ console.log($this); $this.val(resp) } }); }); }

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• jquery animate() problem

  - by meo

  $('#somediv').stop(false, true).animate({marginLeft: '-=' + e.width() + 'px'}, options.speed, function(){ options.onNewSlide() }) e.with() returns 640 opctions.speed contains 800 options.onNewSlide() contains a a custom callback function It works fine in firefox. But i debugged it with jquery.lint because it was throwing some random error in IE. lint tells me: When I called animate(...) with your args, an error was thrown! TypeError: c.speed is not a function { message="c.speed is not a function", more...} You passed: [Object { marginLeft="-=640px"}, 800, function()] and it indicates me the line i have posted. I have checked the jquery doc, but my syntax seams ok. Do you know what i am doing wrong?

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• Button stops working after loading div via ajax

  - by asovgir

  I have two divs on the page: main div and secondary, which loads a separate html page using ajax. All the links within the main div trigerred by a click event continue to work correctly and reference the appropriate content, but none of the jquery outside this div works (such as the navigation). Here's my jQuery: var url; $('.main a').live('click',function() { url = $(this).attr('href'); $('.secondary').load(url); return false; }); Can anyone help me why this isn't working? I think I am supposed to trigger a callback event but I am not sure how to do so. I know this question has been asked multiple times already (usually suggesting to use .live() or .on()), but none of those solutions seemed to work for me.

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• Getting URL of executing JavaScript file (IE6-7 problem mostly)...

  - by TooTallNate

  Hey all, I've been trying to throw together a generic function that retrieves the absolute URL of an executing JavaScript file on a web page: http://gist.github.com/433486 It works great in almost all the browsers I've tested (Firefox, Chrome, Safari, Opera v10 at least, and IE 8). It seems to fail, however, in IE 6 and 7. The callback function gets executed, but the retrieved name is simple the URL to the main HTML page, not the JavaScript file. So all I'm really asking is if there's some other way of getting the URL of the current JavaScript file (which could be IE 6 and 7 specific)? Thanks in advance!

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• If I write a framework that gets information from the Internet, should I make a degelate or use blocks?

  - by Time Machine

  Say I'm writing a publicly available framework for the Vimeo API. This framework needs to get information from the Internet. Because this can take some time, I need to use threadin to prevent the UI from hanging. Foundation uses delegates for this, like NSURLConnectionDelegate. However, Game Kit uses blocks as callback functions. What is the recommended way of doing this? I know blocks aren't supported in standard GCC versions, but they require less, much less code for the one that uses my framework. Delegates, on the other hand, are real methods and when protocols are used, I'm sure the methods are implemented. Thanks.

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• Know of any open source projects written in C#, that don’t use any other .Net related technologies

  - by AspOnMyNet

  Do you know of any open source code that would go beyond the basic exercises (aka demonstrations of how particular C# construct works), thus a C# code that would have some real world value? I did read similar threads ( http://stackoverflow.com/questions/1391909/as-a-net-beginner-what-should-i-learn-and-where-can-i-find-open-source-projects ) and the sites suggested (like http://www.codeplex.com and http://sourceforge.net), but all the apps I’ve found there are built using C# in conjunction with other technologies ( such as WinForms, Asp.Net, WCF, WPF, F#,Javascript ), while at the moment all I know is C#, a bit of Html and a bit of Ado.Net. I do plan to learn these technologies also, but that could take months while I’d like to create some useful C# apps right now. thanx

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