binding

问题 I have a textarea in the first page and when i go to next page i need this value to show in a notepad component that is shared in the next pages but at the same time i need that when i write new info in the shared component first and new information can be saved and displayed. i need to use angular2 and i cant use any stuff from github.enter image description here 回答1: Since its not a parent-child relation, you can use shared service and pass the textarea value using setter and getter .

问题 I'm trying to bind a ContentControl's Content to a UserControl I have instantiated in my ViewModel. I cannot use the method with binding to a ViewModel and then have the UserControl be the DataTemplate of the ViewModel, as I need the Content of the ContentControl to be able to change frequently, using the same instance of the UserControls/Views, and not instantiate the views each time i re-bind. However, when setting the UserControl-property to a UserControl-instance, and then when the view

问题 Is there any way so that i can show only first character of a Bound string on a textblock..? For eg;If i Bind 'Male', my textblock should only show 'M'..... 回答1: You might use a value converter to return a string prefix: class PrefixValueConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { string s = value.ToString(); int prefixLength; if (!int.TryParse(parameter.ToString(), out prefixLength) || s

问题 In Rust, in order to change the value of a mutable variable, what is the difference in let x = 12 or x = 12 in the following sample code? fn main() { let mut x: i32 = 8; { println!("{}", x); let x = 12; // what if change to x = 12 println!("{}", x); } println!("{}", x); let x = 42; println!("{}", x); } The output is 8, 12, 8, 42 . If I change let x = 12 to x = 12 ... fn main() { let mut x: i32 = 8; { println!("{}", x); x = 12; println!("{}", x); } println!("{}", x); let x = 42; println!("{}",

问题 I have read the documentation from Xamarin. And this is my test class in Objective-C: #import "XamarinBundleLib.h" @implementation XamarinBundleLib +(NSString *)testBinding{ return @"Hello Binding"; } @end It's very easy, just one method. And this is my C# class: namespace ResloveName { [BaseType (typeof (NSObject))] public partial interface IXamarinBundleLib { [Static,Export ("testBinding")] NSString TestBinding {get;} } } Then this is my AppDelegate code: public override bool

问题 I'm currently trying to bind to certain items in a collection in wpf. This is best explained by an example. My XAML is below: <Canvas Name="TaskCanvas" Width="467.667" Height="414"> <Ellipse Name="myElipse" Fill="White" Stroke="Black" Width="126" Height="76" Canvas.Left="{Binding Path=XPos}" Canvas.Top="{Binding Path=YPos}" /> </Canvas> Now as you can see i am just binding to the properties as a simple example of the ellipse to position it on the x and y axis from my data source. I have c#

问题 I can't seem to get my form to bind to the checkboxes control. I read many posts on here and tried a few techniques but no luck. Maybe a fresh set of eyes will help. my controller: public String editAccount(@RequestParam("id") String id, Model model) { model.addAttribute("account", accountService.getAccount(id)); model.addAttribute("allRoles", roleService.getRoles()); return EDIT_ACCOUNT; } my jsp: <form:form action="" modelAttribute="account"> <form:checkboxes items="${allRoles}" path="roles

问题 I have searched on json schema with java bindings with inheritance and all searches led me to the usage of "allOf". Using allOf would potentially solve my problem, but I am wondering if there is a construct in json schema that I can use which will generate my java code with real java inheritance "B extends A" - rather than inlining all properties from A inside B ? I am wondering if this is even supported / doable or I am just dreaming. If not supported, I would be curious to know the reason.

问题 In my project, I have TreeView, which contains a tree of objects of various types (all subclassed from the same superclass). To the right of my TreeView I would like to have a "panel" (at the moment I just have a Grid) which displays information about the object currently selected in the tree. I want to use DataTemplate, as in the second example on this page, to adapt the layout & content of my "panel" based on the subclass type; however, I cannot find a suitable container (as I don't want a

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . I know there are already questions on that topic, but the issues there are somewhat specific to other problems and do not offer