children | 易学教程

Suitable environment for a 7 year old [closed]

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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 7 years ago . My 7 year old would like to learn, how to program? (his idea not mine, and he does things in the outside world. So, I am not too

jQuery实现透明度变化轮播效果

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匆忙写的一个透明度变化的轮播效果，欢迎指出错误，感谢！！！ <!DOCTYPE html> < html lang = "en" > < head > < meta charset = "UTF-8" > < title > jQuery透明度变化轮播效果 </ title > < script type = "text/javascript" src = "../bootstrap-3.3.7/js/jquery2.0.js" > </ script > < style > * { font-family : 微软雅黑 ; } .container { width : 1140 px ; padding : 0 15 px ; margin : 0 auto ; } #zz_carousel { width : 1140 px ; height : 500 px ; overflow : hidden ; position : relative ; } #zz_carousel :hover .arrow { display : block ; } #zz_carousel .paging { position : absolute ; bottom : 15 px ; left : 50 % ; } #zz_carousel .paging span { display :

css all divs vs direct child divs

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I have this structure: <div class="Root"> <div>ddddddd</div> <div> <div>pppppppppp</div> <div>pppppppppp</div> </div> <div>ddddddd</div> <div> I want to put borders on the div s that contain ddddddd , and I want to set the text color on all div s to green. There are two rules: I can't add class attributes. I have to write selectors that start with .Root . Any ideas? Actually I was searching this: Selects the divs that are direct children of Root: .Root > div { border: 1px solid red; } Selects all the divs under Root: .Root div { color:green; } Something like this? .Root > :first-child, .Root >

Prevent duplicate MDI children forms

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Is there a way to prevent the opening of a certain form within an MDI container if that said form is already opened? You can interate over the OpenForms collection to check if there is already a form of the given type: foreach (Form form in Application.OpenForms) { if (form.GetType() == typeof(MyFormType)) { form.Activate(); return; } } Form newForm = new MyFormType(); newForm.MdiParent = this; newForm.Show(); AFAIK there is no standard way. You'll have to implement it yourself. I'd do it this way: class TheForm: Form { private static TheForm Instance; private TheForm() // Constructor is

jQuery Find and List all LI elements within a UL within a specific DIV

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I have 3 Columns of ULs each a Dynamic UL container that can have anywhere from 0-9 LI containers (eventually more). All my LI elements have an attribute "rel" which I am trying to ultimately find that attribute and use it for something else on all LI elements within that parent DIV. I do eventually want to find more based on each but for not the very least the rel.. Any Ideas how I can achieve that with jQuery? Example: <ul id="column1"> <li rel="1">Info</li> <li rel="2">Info</li> <li rel="3">Info</li> </ul> <ul id="column2"> <li rel="4">Info</li> <li rel="5">Info</li> <li rel="6">Info</li> <

Styling nested elements in WPF

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Suppose you have a nested element structure, for example a ContextMenu with MenuItems: <ContextMenu Style="{StaticResource FooMenuStyle}"> <MenuItem Style="{StaticResource FooMenuItemStyle}"/> ... </ContextMenu> You can easily apply styles or templates to the ContextMenu or MenuItem elements. But if the MenuItem style belongs to the Menu style it is quite cumbersome and redundant to add it to every MenuItem element. Is there any way to apply those automatically to child elements? So that you can simply write this: <ContextMenu Style="{StaticResource FooMenuStyle}"> <MenuItem/> ... <

Get ListView children that are not in view

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For an App I am working on, I'm trying to get the children of a ListView. To do this I have the following piece of code: View listItem = mListView.getChildAt(i); However, this only works for children that are in view. I need to also reach the children that are not in view. How would I do this? EDIT: Comparing the suggested methods to the one I was already using I find the following: RelativeLayout listItem1 = (RelativeLayout) mListView.getAdapter().getView(i, null, mListView); RelativeLayout listItem2 = (RelativeLayout) mListView.getChildAt(i); Log.d("Checks", "listItem1: " + listItem1); Log.d

jQuery figuring out if parent has lost 'focus'

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问题 I'm stuck on figuring out the logic to make a drop down menu keyboard accessible. The HTML is structured as such (extra class names used for clarity): <ul> <li class="primaryMenuItem"> <a href="">Link 1</a> <ul class="popUpMenu"> <li><a href="">Sub Link 1</a></li> <li><a href="">Sub Link 2</a></li> </ul> </li> <li class="primaryMenuItem"> <a href="">Link 2</a> <ul class="popUpMenu"> <li><a href="">Sub Link 1</a></li> <li><a href="">Sub Link 2</a></li> </ul> </li> </ul> Link 1 and Link 2, when

jquery if div id has children

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This if -condition is what's giving me trouble: if (div id=myfav has children) { do something } else { do something else } I tried all the following: if ( $('#myfav:hasChildren') ) { do something } if ( $('#myfav').children() ) { do something } if ( $('#myfav:empty') ) { do something } if ( $('#myfav:not(:has(*))') ) { do something } S Pangborn if ( $('#myfav').children().length > 0 ) { // do something } This should work. The children() function returns a JQuery object that contains the children. So you just need to check the size and see if it has at least one child. This snippet will

WPF Canvas, how to add children dynamically with MVVM code behind

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Requirement: To draw one Bitmap Image (of 1024 x 1024 pixels) and rectangle(s) based on the collection of points. The rectangle should exactly fit on the pixels location over the image. There is also some text need to be added inside the rectangle. The Image will be always only one and the rectangles will be dynamically added. Current Solution: Have a canvas with Image Control. Add the the dynamic code under the code behind file ViewImageResult.xaml.cs. private void DrawResult(int left, int right, int width, int height) { Border bord = new Border(); bord.BorderThickness = new Thickness(1);