parent-child | 易学教程

JS based webapp basemap hidden in IE9

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问题 I think this question is related to either/or raw Javascript and JQuery..but I think it is also related to the ArcGIS Javascript API map class..my problem is an IE9 issue; the app works fine in Chrome and FF. (I have also asked this Q on ESRIs JS forum, but no answer so far...) I have a web app where a map opens up in its own div on a map click (not using window.open or iframes) . After loading the app for the first time, the basemap opens as expected (at first the map is only the basemap

Vue.js parent <-> child updating value, routing view

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问题 I'm having issue regarding updating parent prop in child view. In my case Contestant is parent, EditContestant should be child. Contestant.vue should store (yeah, probably answer is right here - store as in Vuex) user info and EditContestant should only render edit view, allow for edit user info action and save it via own method or parent method. I've included routing so you should get what I'm talking about. Structure is: Contestant.vue |-EditContestant.Vue Contestant.vue: <script> export

Link back out from child HTML loaded in div to parent HTML

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问题 I have an id'd part of a child HTML file loaded into the parent HTML's div. I have a button at the top to empty out the child content and return the div to the parent content that was there previously. This is for an image gallery, with a main navigation (parent) and then the detailed view with smaller navigation (child). Here is the parent HTML, index.html (with CSS and JS embedded): <html> <head> <title>Java Factory</title> <script type="text/javascript" src="js/jquery-1.7.1.min.js"><

Bloc stream not updating properly

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问题 This is a direct follow on from: Bloc architecture "the getter x was called on null." which was resolved by @nonybrighto The issue now is that although I am getting no error from the application any more, the logic is failing somewhere as the colours are not updating, they just remain blue. If I call: colorBloc.changeColor(); from either a callback to the child (dropdownmenu) itself, or directly from the parent, it just doesn't actually update the colours of these widget buttons. They are

How to access parent widget pointer in QT

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问题 I have a code something like this Window::Window() { QStackedWidget *centralApp = new QStackedWidget; QWidget1 *wgt1 = QWidget1; QWidget2 *wgt2 = QWidget2; QWidget3 *wgt3 = QWidget3; centralApp->addWidget(wgt1); centralApp->addWidget(wgt2); centralApp->addWidget(wgt3); } The classes QWidget1,QWidget2 and QWidget3 are inherited from QWidget and each contains two buttons btn1 and btn2 . These buttons I want to use the two buttons in each widget to navigate to other two widgets added to stacked

TSQL Cascade delete for child records?

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问题 I have a parent/child table (simple tree) table structure (ID, ParentID), where I want to delete (and get the ID of) all children for a given parent ID - similar to this post sql server, cascade delete and parent/child table . During the loop, where I've got the current ID, I will also be performing other actions with this ID. Can someone give me an example of the SPROC to accomplish this? Thanks 回答1: Assuming, you're on SQL SERVER 2005, here is the example of stored procedure to accomplish

Retrieving return code from child process using wait()?

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问题 I have 2 files "prime.c" and "singlePrime.c" and inside of singlePrime.c I am trying to create a child that morphs itself into "isPrime.exe" which is an executable made out of "prime.c". What I want to do is get the return number from isPrime.exe so either 1 or 0 depending on if the input number is prime or not and then store it in childNum inside of the main() function of "singlePrime.c" so that I can print to the terminal whether it's a prime number or not based on 1 or 0 that is returned

SQL parent child recursive query - Includes Relatives relatives

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问题 I have the following Table with two columns. Parent Child A C A D B A B E C H J C F G G I So I need to pass in a Parent of A and I am supposed to get the following back- All of a's Parent's and children but Also all of the Parents and Children to those associated to A (either parent or children) I need all their parents and children and so on. SO in the example of A being passed to the proc I would get the following A C A D B A B E C H J C If F was Passed I would just get F G G I 回答1: select

getting original type of this object

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问题 I'm trying to use metaprogramming to prevent duplicate code in a parent-child structure. I got it working up to a certain point. The code shown at the bottom compilers and runt correctly, but some relations ( /*Tree_tag,*/ and /*Parasite_tag*/ ) are commented out. If uncommented, MSVS2017 shows error C2664: 'void Obj<std::tuple<Human_tag>,std::tuple<>>::removeParent(const Obj<std::tuple<>,std::tuple<Tree_tag,Dog_tag>> *const )': cannot convert argument 1 from 'Obj<std::tuple<>,std::tuple<Dog

Instantiating Objects & the relation of Child/Parent classes

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问题 So, I'm trying to understand some concepts here. 1) The general "syntax" (if you will) of creating a new object. For example, which of the following is "correct" (I know there's more than one way to instantiate an object): //1) ChildClass obj = new ParentClass(); //2) ParentClass obj = new ChildClass(); I know that the following two are "legal," but I can't understand the difference between instantiating an object when it comes to Child/Parent classes (I already know that these two are okay):