children

React - how to determine if a specific child component exists?

由 a 夏天 提交于 2019-12-21 02:47:47
问题 If I have this structure: const MyComponent = (props) => { return ( <Wrapper />{props.children}</Wrapper> ); } and I use it like this: <MyComponent> <SomeInnerComponent /> </MyComponent> How can I check to see if <SomeInnerComponent /> has specifically been included between <MyComponent></MyComponent> , from within the MyComponent function? 回答1: Given that you want to check that SomeInnerComponent is present as a child or not, you could do the following const MyComponent = (props) => { for

easyui+treegrid实现繁琐的小功能

由 半世苍凉 提交于 2019-12-20 17:54:51
分页+多选 <html> <head> <title>treegrid</title> <link rel="stylesheet" type="text/css" href="/MgmtCenter/resource/jquery-easyui-1.4.3/themes/default/easyui.css"> <link rel="stylesheet" type="text/css" href="/MgmtCenter/resource/jquery-easyui-1.4.3/themes/icon.css"> <script language="javascript" src="/MgmtCenter/device/js/jquery-1.8.3.min.js"></script> <script language="javascript" src="/MgmtCenter/resource/jquery-easyui-1.4.3/jquery.easyui.min.js"></script> <script type="text/javascript"> $(function() { 　　　　　/*初始化时加载内容*/ $('#treeTable') .treegrid( { url : 'ajaxSafePolicyListNew.action?pageNumber='

Is it possible to adopt a process?

由 让人想犯罪 __ 提交于 2019-12-20 16:51:06
问题 Process A fork() s process B. Process A dies and therefore init adopts B. A watchdog creates process C. Is it somehow possible for C to adopt B from init ? Update : Or would it even be possible to have C adopt B directly (when A dies), if C were created prior to A's dead, without init becoming an intermediate parent of B? Update-1: Also I would appreciate any comments on why having the possiblity to adopt a process the way I described would be a bad thing or difficult to impossible to

Implementing parent class methods with several children class in Java

由 一个人想着一个人 提交于 2019-12-20 07:33:43
问题 I have a class (let's call it A ) that is extended by several children class ( B , C , D , etc.). In each child class, there are specific methods that I'd like to be accessible from an instantiation of the parent class A . I tried to declare A as an abstract class, and to declare each child class methods inside as abstract. Then I implemented these methods in their own class but it seems that each child class must implement every method of the parent class. However, I can't do this. Would you

JQuery: How to find out how many children an element has?

由 此生再无相见时 提交于 2019-12-19 17:44:52
问题 How can I use jQuery to find out how many children an element has? Say I have the following structure: <div id="container"> <div id="column1"> <div id="asset1"></div> <div id="asset2"></div> </div> <div id="column2"> <div id="asset1"></div> <div id="asset2"></div> </div> </div> I want to find out how many children the div element: container, has. In this case it would return 2... 回答1: Use children and length: $("#container").children().length 回答2: Use the direct children selector (>) and the

JQuery: How to find out how many children an element has?

由 巧了我就是萌 提交于 2019-12-19 17:44:10
问题 How can I use jQuery to find out how many children an element has? Say I have the following structure: <div id="container"> <div id="column1"> <div id="asset1"></div> <div id="asset2"></div> </div> <div id="column2"> <div id="asset1"></div> <div id="asset2"></div> </div> </div> I want to find out how many children the div element: container, has. In this case it would return 2... 回答1: Use children and length: $("#container").children().length 回答2: Use the direct children selector (>) and the

C# WPF add control to main window at run time

由 家住魔仙堡 提交于 2019-12-19 05:18:55
问题 Its a bit ridiculous that I cant find a simple answer to this. My goal is to attach a new image control while the application is running. img = new System.Windows.Controls.Image(); img.Margin = new Thickness(200, 10, 0, 0); img.Width = 32; img.Height = 32; img.Source = etc; Ive tried this.AddChild(img);// says must be a single element this.AddLogicalChild(img);// does nothing this.AddVisualChild(img);// does nothing It was never this difficult to add a element with forms. How can I simply

Web.config transformation: how to apply a transformation to all node matching a Locator expression?

由 我只是一个虾纸丫 提交于 2019-12-19 00:09:11
问题 I've recently discovered the web.config automatic transformation in the web deploy tool of visual studio 2010. It's working well, but I have a scenario I can't seem to get working. Assume I have the following root Web.config <services> <service name="Service1"> <endpoint address="" binding="customBinding" bindingConfiguration="LargeBufferBinding" contract="Service1" /> <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" /> </service> <service name="Service2">

Jquery $(this) Child Selector

由 可紊 提交于 2019-12-18 10:58:10
问题 I'm using this: jQuery('.class1 a').click( function() { if ($(".class2").is(":hidden")) { $(".class2").slideDown("slow"); } else { $(".class2").slideUp(); } }); On page structure: <div class="class1"> <a href="...">text</a> <div class="class2">text</div> </div> It only works when you don't have multiple class1/class2 sets like: <div class="class1"> <a href="...">text</a> <div class="class2">text</div> </div> <div class="class1"> <a href="...">text</a> <div class="class2">text</div> </div>

get text of an element without children in javascript

由 无人久伴 提交于 2019-12-18 05:44:32
问题 How do I get the text of an element without the children? Neither element.textContent nor element.innerText seem to be working. HTML: <body> <h1>Test Heading</h1> <div> Awesome video and music. Thumbs way up. Love it. Happy weekend to you and your family. Love, Sasha </div> </body> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script> <script type="text/javascript"> fool("body"); </script> and here's the fool function: jQuery.fn.justtext = function(text) {
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