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• document.form[0] is Null or Not an Object error when hiding a text field in ASP.Net

  - by grady

  Hey, I am hiding a TextBoxin my aspx page like this: myField.visible=false; Now I have a DropDown as well which tries to access the TextBox on IndexChange. The problem is, it cant access the hiffen TextBox and I am getting document.form[0] is Null or Not an Object. How can I solve that? Is the some check for that in JavaScript? Thanks :-)

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• Quickest way to dump Python dictionary (dict) object to a MySQL table?

  - by NJTechGuy

  I have a dict object. I dumped the data using this: for alldata in data: # print all data to screen print data[alldata] Each field had brackets [] and 'None' values for NULLS and date.datetime for date values. How do I dump this dict to MySQL table? Thank you!

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• Interview Question: Why we can not create object of abstract class.

  - by MAS1

  In interview someone ask me @ Abstract class. I told him @ abstract class and i also told that we can not create object of this class. his next question is why? because it may or may not include abstract methods.

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• How can you databind a single object in .NET ?

  - by Tomas Pajonk

  I would like to use a component that exposes the datasource property, but instead of supplying the datasource with whole list of objects, I would like to use only simple object. Is there any way to do this ? The mentioned component is DevExpress.XtraDataLayout.DataLayoutControl - this is fairly irrelevant to the question though.

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• What is a good way to ensure the background of a flash object matches the page?

  - by George Edison

  Since there is no way that you can make the flash object transparent, there needs to be some other means by which you can match the background. I thought of maybe creating a ActionScript/Javascript bridge, but I wonder if this is the route to take. Do I have a better option?

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• Can two managed object context share one single persistent store coordinator?

  - by mystify

  Example: I have one persistent store coordinator which uses one single persistent store. Now there are two managed object contexts, and both want to use the same persistent store. Could both simply use the same persistent store coordinator, or would I have to create two instances of NSPersistentStoreCoordinator? And if I had to, then: Would I also have to create two NSPersistentStore instances?

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• What is the easiest to transfer an object between two C# apps over the web?

  - by edude05

  I have written an application that basically gathers up a bunch of text and numerical data from the client PC and stores it as an object. Right now I'm implementing XML serialization so that the file can be saved. The issue is now, how do I get this data to the server? I have a server running IIS 7 setup but I don't quite understand the ASP.net life cycle, so I'm not sure how to implement the receiving app. What should I do? Thanks

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• Can I refer to an object in its constructor?

  - by Roman

  Can I do the following? public Manager(String userName) { game = new Game(userName); game.addManager(this); } The problem is that I refer to an object (this) in its constructor (before it was actually created).

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• In which situations does a managed object context have changes?

  - by dontWatchMyProfile

  In which situations does a managed object context have changes? What can happen that -hasChanges returns YES?

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• It is good programming practice to always check for null pointers before using an object in C++?

  - by jm1234567890

  This seems like a lot of work; to check for null each time an object is used. I have been advised that it is a good idea to check for null pointers so you don't have to spend time looking for where segmentation faults occur. Just wondering what the community here thinks?

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• Is it possible to call an object method this way in C++?

  - by Goose Bumper

  Here's my class definition: class A { public: void do_lengthy_work() { cout << "working." << endl; } }; I have an object of type A, and I want to call do_lengthy_work() on it: A a; a.do_lengthy_work(); Is it also possible to call the same method using some variant of the following? A::do_lengthy_work(a);

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• C++: Saving the class object in archived format which is having char * attributes and read it back f

  - by Manjunath

  Hi all, Assume I have a class class A { char *attr1,*attr2; public: . . . }; How to save the object of this class to file in a binary format and read it back? Thanks.

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• How to check if object has any properties in JavaScript?

  - by Ricky

  Assuming I declare var ad = {}; How can I check whether this object will contain any user-defined properties?

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• How to train software so it recognize the kind of object shown in a 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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• The type of the argument object [type] is not primitive.

  - by Abstract

  I'm trying to create a simple Guestbook web service using ASP.NET WebServices. When trying to serialize a list of objects, I get the following exception: System.InvalidOperationException: The type of the argument object 'GuestBookService.GuestBookEntry' is not primitive. How can I fix this error?

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• Is there a Pattern in Scala that add a method to an Array object?

  - by Fred Haslam

  Is there a Pattern in Scala that can add a method to an Array object? I am thinking of the implicit conversion of Int to RichInt. But that can't be done as Array is a final class.

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• How can I move an object left and right with silverlight?

  - by Craig

  I currently have two buttons that say left and right, and I want them to move a square object left and right respectively. What its currently doing when i press left is moving the square to the left, and if I press left again, it resets from the center and goes left. I want it so that when I press left, from where ever it is currently to go left and right. I know the principle is something like get current objects position and add the canvas coordinates respectively but how do I do this?

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• How one can add a new key:value pair in existing JSON object through Javascript.

  - by basit74

  I have a JSON Struct like appointerment= {ids: '15,16,17', appointments: {'15': '12.05.2010,14,05,2010'} } now in appointments object I want to add something like '16', '21.05.2010' what is the best possible way to do this.

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• I used shared object to drawing line. But some times syncevt.changeList[cl].name is "clear" insted o

  - by sachin

  I used shared object to drawing line. But some times syncevt.changeList[cl].name is "clear" insted of "success". and value of setproperty become undefined. Have any solution for this porblem

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• R: how to construct a mathematical expression from a character object?

  - by Rob Hyndman

  In R, I'm wanting to create a graph with x axis label expression(varname), where varname is a character object. For example: varname <- "beta[1]" hist(rnorm(20),xlab=expression(varname)) But that gives me a graph with xlab="varname" rather than xlab=expression(beta[1]). How to I convince expression() to evaluate the variable?

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• How to convert a JSON string to an object?

  - by BrunoLM

  How can I convert a JSON string to an object in JavaScript? Is there a method that does this? Something like: var x = "{ id: 5, name: 'hello' }"; var y = /*something*/(x); alert(y.id + " " + y.name);

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• Is there a way to get only the changed columns from an object using Hibernate?

  - by Vaishak Suresh

  In a persistent object, If i change only one field, Is it possible to find out the changed field only through Hibernate? I know I can get the entire old row and new row and compare.

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• Method parameter that can take an object or a nil?

  - by Dan Ray

  How do I spell a method whose argument can either be an object of a certain type, or nil? You see those all the time in framework classes, but I've just encountered my first instance where it would be useful to create one.

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• Is there any practical difference between an extension method on <T> or on Object?

  - by Scott Bilas

  Is there any practical difference between these two extension methods? class Extensions { public static void Foo<T>(this T obj) where T : class { ... } public static void Foo(this object obj) { ... } } I was poking around in Extension Overflow and I came across the first form, which I haven't used before. Curious what the difference is.

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• How do I get the index of the current Object in an NSEnumerator iteration?

  - by RexOnRoids

  Question: How do I get the index of the current Object in an NSEnumerator iteration? (I don't want to keep track of things using an integer counter or use a for loop due to speed reasons. I did it before I just cannot remember how I did it...)

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