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问题 When a web form is written to the browser, the browsers remembers what the initial values are of a text INPUT box. ie. when it receives HTML like this: <input type="text" value="something"> The browser remembers "something" as the initial/default value. When the user starts typing over it, then hits ESC, the browser reverts the field to the initial value (or blank if it was initially blank of course). However, when creating a text input box programatically, hitting ESC always seems to blank

问题 Let's say that I would prefer geom_point to use circles ( pch=1 ) instead of solid dots ( pch=16 ) by default. You can change the shape of the markers by passing a shape argument to geom_point , e.g. ggplot(diamonds, aes(depth, carat, colour=cut)) + geom_point(shape=1) ggplot(diamonds, aes(depth, carat, colour=cut)) + geom_point(shape=16) but I can't figure out how to change the default behaviour. 回答1: Geom (and stat) default can be updated directly: update_geom_defaults("point", list(shape =

问题 In a ctypes Structure, is it possible to specify default values? For example, with a regular python function, you can do this: def func(a, b=2): print a + b That would allow for this behaviour: func(1) # prints 3 func(1, 20) # prints 21 func(1, b=50) # prints 51 Is it possible to do this in a ctypes Structure? for example: class Struct(Structure): _fields_ = [("a", c_int), ("b", c_int)] # b default should be 2 def print_values(self): print self.a, self.b struct_instance = Struct(1) struct

问题 Using migrations, I need to add a new field (a foreign key) to a model. I know it can be done with: migrations.AddField( model_name='MyModel', name='state', field=models.ForeignKey(null=True, related_name='mymodel_state', to='msqa_common.MyModelState'), ), However, I don't want my field to be nullable. Instead, I want to use a default value for it, corresponding to the id of MyModelState whose name is "available" (id value might change in different machines). This "available" value of table

问题 I need to use this constructor public StreamReader(Stream stream, Encoding encoding, bool detectEncodingFromByteOrderMarks, int bufferSize, bool leaveOpen) in order to set leaveOpen to true . And in order to do that I need to set the other parameters as well ( Encoding encoding, bool detectEncodingFromByteOrderMarks, int bufferSize ). I want to use StreamReader as it is so I do not want to give some random values. What are the default values for these parameters? By the way, I know that I can

问题 I'm very new to C# so please bear with me... I'm implementing a partial class, and would like to add two properties like so: public partial class SomeModel { public bool IsSomething { get; set; } public List<string> SomeList { get; set; } ... Additional methods using the above data members ... } I would like to initialize both data members: IsSomething to True and SomeList to new List<string>() . Normally I would do it in a constructor, however because it's a partial class I don't want to

问题 When I send to the default player Intent i = new Intent("com.android.music.musicservicecommand"); i.putExtra("command", "play"); ACTIVITY.sendBroadcast(i); it starts to play. When I send Intent i = new Intent("com.android.music.musicservicecommand"); i.putExtra("command", "stop"); ACTIVITY.sendBroadcast(i); It stops. But when I try to play again then it doesn't play. It just plays for a second and then stops again. I saw on the log I get two intents. The intent.getBooleanExtra("playing",

问题 I'm just about to start a new project of mine and am currently evaluating some techniques for localization, modularity etc. I have (at least in my opinion) a pretty good approach to localization but now I struggle to find a good solution for databinding. I want to bind values of textfields etc. (UIElements in general) to a specific method in the DataContext of the form. The method looks like this: public void GetValue(string name) where name is a "path" in the form of "node/subnode/subsubnode

问题 In my attempt to further future-proof a project I am trying to find the best way to retrieve the full path and filename of the index/default page in a web directory using C# and without knowing the web server's list of filename possibilities. 'Server.MapPath("/test/")' gives me 'C:\www\test\' ...so does: 'Server.MapPath(Page.ResolveUrl("/test/"))' ...but I need 'C:\www\test\index.html'. Does anyone know of an existing method of retrieving the filename that the webserver will serve up when

问题 I am trying to change the proposed filename within the " Save As "-Dialog based on the content of a Content Control. My understanding was that Word is proposing the Document Property „ Title “ within the SaveAs Dialog. Within an empty Document I created a Content Control (Text only) and put the following code in "This Document". Private Sub Document_ContentControlOnExit(ByVal objCC As ContentControl, _ Cancel As Boolean) ActiveDocument.BuiltInDocumentProperties("Title") = objCC.Range.Text End