parent-child

问题 I am trying to get parent child relation and successfully get that But I am stuck how to identify what is the level of the child. Here is my code public function getDownline($userid = null) { $category_data = array(); $where = array('parent_id' => $userid); $this->db->where($where); $category_query = $this->db->get('users')->result(); $category_data = array(); foreach ($category_query as $category) { $category_data[$category->id] = array($category); $children = $this->getDownline($category-

问题 I am using vue carousel https://ssense.github.io/vue-carousel/api/ It woks well but I need to resetthe carousel I can see there is a value of current page and I think setting this to 0 would work as a reset. However these seems to be no exposed method to allow me to do this. Can I set it from the parent? 回答1: If you want to set a data property on a child component, you can set a ref attribute on that child's tag and then access the child instance via this.$refs . In your case, you could add a

问题 I'm writing an application that has Reactor and Zone objects. Each Reactor has a variable number of zones, and stores them in a private field called _zones. In turn, each Zone must know to which Reactor does it belong, so it stores a pointer to its reactor in a private field. I assign this field by passing a reactor object into the Zone constructor. Here is the sample code: Public Class Reactor Private _zones As New List(Of Zone) End Class Public Class Zone Private _reactor As Reactor Public

问题 I have a "problem" that at first sight didn't look like one. So, I have a parent div containing to childs. The one child will contain text, and the other a picture. Both are inline-block elements (they need to be positioned next to each other), and have set widths. Now, when the picture div is bigger than the text div, the parent inherits the height of that div (the biggest one). But the second child (which is smaller) is placed at the bottom of that div. What I want is to have that div

问题 I have this class hierarchy: public interface ISR { } public interface ICU { } public interface IFI { } public class CU : ICU { } public class SR : ISR { public SR(IFI fi) { FI = fi; } public IFI FI { get; set; } } public class FI : IFI { public FI(ISR sr, ICU cu) { SR = sr; CU = cu; } public ISR SR { get; set; } public ICU CU { get; set; } } public class Module : NinjectModule { public override void Load() { Bind<ISR>().To<SR>(); Bind<ICU>().To<CU>(); Bind<IFI>().To<FI>(); } } class Program

问题 #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <errno.h> #include <string.h> int main( int argc, char **argv) { int pfds[ 2], i; size_t pbytrd; pid_t childpid; char buffer[ 200]; pipe( pfds); if( ( childpid = fork() ) == -1) { perror( "fork error: "); exit( 1); } else if( childpid == 0) { close( pfds[ 0]); dup2( pfds[1], 1); close( pfds[ 1]); for( i = 0; i < 10; i++) printf("Hello..."); execlp( "xterm","xterm","-e","./sample_a", (char *) 0); exit( 0); } else { close( pfds

问题 I have a long-running console-based application Sender that sends simple text to STDOUT using non-buffered output such as cout << "Message" << flush() . I want to create an MFC dialog-based application (named Receiver ) that starts Sender and can read it's output. Receiver should also be able to detect when Sender has died, or be able to kill Sender if it wants to. Sender knows nothing of Reciever , and I can't change Sender 's code. My first attempt was to create pipes with redirected STDIN

问题 I have this HTML code: <span id="search"> <input type="submit" value="" id="button"> </span> I want to change the opacity of #search::after when hovering #button #button:hover #search::after {opacity:1;} It wont work so I wonder if its even possible to do this. 回答1: Using only CSS It's impossible. What you can do is to use JavaScript/Jquery to trigger a action, like this: $("#button").hover( function() { $(this).parent().addClass("hover"); }); and in your css: #search.hover::after {opacity:1;

问题 Trying to use a child route in Aurelia. Can't seem to get my head around the workings of nested routes. Are all routes derived from the root of the app or relative to location of the current router? Why wont my route-href work in this example? I have a route in this router named screen and it does have an :id parameter screens/list.ts @inject(Router) export class ScreensList { heading; router; screens: any[]; constructor(router){ this.heading = 'Child Router'; this.router = router; this

问题 I am calling fork() twice to create two child processes. I want child process A to do an exec() call and child process B to also do an exec() call. The problem I am having with the given code is that after the first exec() from child process A, the next fork() does not seem to occur and the program exits. I think that it has to do with how exec() overlays the parent process. What I want to accomplish is to call exec() from each of the child processes created by fork(). #include <sys/types.h>