binding

问题 Is a separate WPF value converter object instantiated for each binding that a particular value converter class is used in? I am trying to create a two-way bit-to-boolean value converter. I would like to be able to bind a bool property (such as IsChecked ) to a bit in a value type (like a ushort ). I'm using the converter's parameter arguments to specify the bit. Implementing the ConvertBack() method is easy, but Convert() is little trickier. In Convert() I need to know what the value of the

问题 ok, this one is driving me nuts... I just can't seem to figure out the correct way to make html bindings in knockout, play nicely with twitter bootstrap elements. I have, the following HTML: <li><a href="#"><i class="icon-user"></i> Enable/Disable User</a></li> This line is actually part of some other li's that are in a ul, but I'm showing ONLY the bit I need for simplicity. As you can see, I'm also using twitter bootstrap here, as is evidenced by the icon class. Ok, so that's all good, when

问题 This is how I'm binding my params: $Con = mysqli_connect(...); $Statement = mysqli_stmt_init($Con); mysqli_stmt_prepare($Statement,"select * from users where name=? and email=?"); mysqli_stmt_bind_param("s",$Username); mysqli_stmt_bind_param("s",$Email); <-- it fails here But it works fine in the other case when I replace the 2 calls to mysqli_stmt_bind_param with: mysql_stmt_bind_param("ss",$Username,$Email) The problem is that I have an array of params; I have to bind them one by one coz I

问题 I am using the tkinter Treeview widget to show a database. The command when clicking on one of the headings is used for sorting the table based on the clicked column. Additionally I want a tooltip box show up as soon as I hover (or right click) over one of the headings. The tooltips aren't a problem for other widgets but the heading of a treeview isn't a full widget of course. How can I bind any action to the headings except for the usual command? 回答1: You can bind the events to the treeview

问题 i have following reQuirement Query: "/article? category =kitchen& category =sports" This Query is working without custom bindings. It will give me all Kitchen and sports articles as Response. It is doing an OR-Operation somehow. But i need to customize the binding because i need to ingore the case. Now i am using this customize binding: @Repository public interface ArticleRepository extends JpaRepository<Article, Long>, QueryDslPredicateExecutor<QArticle>, QuerydslBinderCustomizer<QArticle> {

问题 i have following reQuirement Query: "/article? category =kitchen& category =sports" This Query is working without custom bindings. It will give me all Kitchen and sports articles as Response. It is doing an OR-Operation somehow. But i need to customize the binding because i need to ingore the case. Now i am using this customize binding: @Repository public interface ArticleRepository extends JpaRepository<Article, Long>, QueryDslPredicateExecutor<QArticle>, QuerydslBinderCustomizer<QArticle> {

问题 I'm just learning WPF and I could use some help. I have an application which use TabControl and dynamically generates new tabs,on each Tab I have one TextBox and now I'd like to add an undo button to the tool bar which is not the part of the tab (VisualStudio like). The undo button has to work only on the TextBox wich is on the active tab and if there is no tab or the undo can't be executed it will be disabled. And I have no idea how to bind these two items (The tab content has it own xaml

问题 I have a WPF ListView control containing a number of RadioButton controls using data binding. I'd like the first RadioButton in the group to be checked by default, preferably set in the XAML rather than programmatically, but haven't managed to achieve this. My XAML for the control is: <ListView ItemsSource="{Binding OptionsSortedByKey}" > <ListView.ItemTemplate> <DataTemplate DataType="{x:Type Logging:FilterOptionsRadioListViewModel}"> <RadioButton Content="{Binding Value}" /> </DataTemplate>

问题 Is there any way to pass parameters to the onAction methods in the fxml files? Alternatively, can I somehow get the fx:id of the component that called the onAction method? I have several Buttons that should do the same thing, say 5 buttons with ids button1 - button5 that, when pressed, should print the corresponding number 1-5. I don't want to have 5 onAction methods that are identical up to this variable. Any help appreciated, 回答1: Call just one handler, the actionEvent.source is the object

问题 In my routes.php I have this: Route::get('user/{user}/permissions/','UserController@permissions')->name('user.permissions'); In my controller I have: public function permissions(User $user){ dd($user); } $user is empty object (like new user; without attributes ) if I use: public function permissions($user){ dd(User::find($user)); } Works perfectly!! I have previously Laravel 5.2 and this code works fine but in Laravel 5.5 it doesn't work, any ideas why? 回答1: Sounds like you upgraded from 5.2