binding

问题 I'm using the following action on a SpringMvc application: @RequestMapping(value = "/test", method = RequestMethod.GET) public ModelAndView test( @ModelAttribute List<Group> groups ) { //return whatever } My Group class has an 'id' and a 'name' property. Default getter/setter. How should i call this action in order to have this list correctly instanciated? I tried something like: /test?groups.id=2&groups.name=stackrocks&groups.id=3&groups.name=stackrules Didn't work. Also tried: /test?groups[

问题 I essentially have an object: var foo = function() { this.setting = false; this.refresh = function() { ... }; } let a = new foo(); a.setting = true; // a.refresh() is triggered I need to trigger refresh anytime .setting is written to. I feel like it has something to do with bind , but I couldn't quite get it. 回答1: You need to use a getter and a setter for your object. One way is to use getter/setter functions directly: var foo = function() { this.setting = false; this.getSetting = function()

问题 I am exploring python. I curious about python bindings. Could anybody explain, how it is possible that you can have access to C libraries from Python. 回答1: There are several ways to call code written in C from Python. First, there is the ctypes module in the standard library. It allows you to load a dynamic-link library (DLL on Windows, shared libraries .so on Linux) and call functions from these libraries, directly from Python. Such libraries are usually written in C. Second, in case of

问题 I am trying to bind to an integer property: <RadioButton Content="None" IsChecked="{Binding MyProperty, Converter={StaticResource IntToBoolConverter}, ConverterParameter=0}" /> and my converter is: [ValueConversion(typeof(int), typeof(bool))] public class IntToBoolConverter : IValueConverter { public object Convert(object value, Type t, object parameter, CultureInfo culture) { return value.Equals(parameter); } public object ConvertBack(object value, Type t, object parameter, CultureInfo

问题 How do language bindings work? For instance how would one make bindings from a library written in one language to another language? Would the bindings be written in the same language as the library or the language the bindings are for? Is it possible to make bindings to and from all languages or does the language have to somehow support bindings? If that is the case then how does that support work? 回答1: For the most part most languages out there are either written in C (Perl, Python, Ruby,

问题 I am trying to bind ObservableCollection of T to DataGridComboBoxColumn of DataGrid. DataGrid definition is : <DataGrid AutoGenerateColumns="False" ItemsSource="{Binding Model, IsAsync=True}"> <DataGrid.Columns> <DataGridTextColumn Header="Column Entry" IsReadOnly="True" Binding="{Binding ColumnName}"/> <DataGridComboBoxColumn Header="Road Type" ItemsSource="{Binding RoadTypes}"/> </DataGrid.Columns> </DataGrid> This is ViewModel and Model public partial class MainWindow : Window { public

问题 Can anybody tell me how to find or create a binding to OpenCV for GNAT? I want to use Ada2005 to implement some program with OpenCV (1.0 or 2.X), but I don't know how. Can anybody teach me how to do it? 回答1: Teaching you how to create a binding to a complex library is beyond the scope of StackOverflow, but you might start with this tutorial. Then study the relevant GNAT library sources, e.g. Ada.Numerics , and other existing Ada bindings. Among others, Ada 2005 Math Extensions and An Ada

问题 Can anybody tell me how to find or create a binding to OpenCV for GNAT? I want to use Ada2005 to implement some program with OpenCV (1.0 or 2.X), but I don't know how. Can anybody teach me how to do it? 回答1: Teaching you how to create a binding to a complex library is beyond the scope of StackOverflow, but you might start with this tutorial. Then study the relevant GNAT library sources, e.g. Ada.Numerics , and other existing Ada bindings. Among others, Ada 2005 Math Extensions and An Ada

问题 I'm binding TextBlock.Visiblitiy to something, and I want to set the Binding.TargetNullValue to Collapsed , how can I do it in XAML? This one How do I set TargetNullValue to a date? does not work in Silverlight. (No x:Static ). 回答1: This is working for me in SL4: <TextBlock Text="Text" Visibility="{Binding Foo, TargetNullValue=Collapsed}"/> Where Foo: public Visibility? Foo { get; set; } 来源： https://stackoverflow.com/questions/8692862/how-to-set-targetnullvalue-to-visibility-collapsed-in

问题 Suppose i have a month, day and year select. One select for each one. And now i need to bind them to a single backing bean property - java.util.Date. How do i get my goal ? 回答1: Three ways: Back or intermediate it by java.util.Calendar with three getters and three setters. Make use of a Converter , this is however going to be a bit hacky. Make use of a 3rd party component like rich:calendar. Edit: as per the comments, here's how option 2 would look like. page.jsp : <h:form> <h:selectOneMenu