selector | 易学教程

Android中的Selector的用法

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Android中的Selector主要是用来改变ListView和Button控件的默认背景。其使用方法可以按一下步骤来设计: （以在mylist_view.xml为例） 1.创建 mylist_view.xml文件首先在res目录下新建drawable文件夹，再在新建的drawable文件夹中新建 mylist_view.xml，其目录结构为：res/ drawable/ mylist_view.xml。 2.根据具体需求编辑 mylist_view.xml文件新建 mylist_view.xml文件后，在没有添加任何属性时其内部代码结构为： <?xml version="1.0" encoding="utf-8" ?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> </selector> 下面就可以根据项目需求，在其内部定义为自己想要的样式了，主要属性如下： <?xml version="1.0" encoding="utf-8" ?> <selector xmlns:android="http://schemas.android.com/apk/res/android">  <item android:drawable="@drawable

jQuery - How to match an element has attribute a or attribute b

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问题 How to write a jquery selector to match an element has attribute a or attribute b. It must match three elements below <a a="123" b="345"></a> <a a="123"></a> <a b="345"></a> 回答1: You can use a multiple selector ( , ) with the attribute-equals selector (or any other selectors), for example: $("a[a=123], a[b=345]") You can test it out here. 回答2: Or generally for mere presence of attribute $("a[a], a[b]") 回答3: Try this $('a[b="345"],a[a=123] ') See the jQuery Multiple selector docs. 来源： https:/

Performing selector on UILabel generates crash?

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问题 I read that UILabels aren't meant to respond to touch events, and that I could just use a UIButton. However, I have to subclass UILabel anyways to override another method, so I thought I might as well use a label to keep changes to my code a minimum. How can I get my label to respond to touch events? The code and error displayed are below. UILabel *tempLabel = [[UILabel alloc] initWithFrame:CGRectMake(startingPoint, 5, 10, 22)]; tempLabel.text = equationText; tempLabel.font = [UIFont

Python Selector (URL routing library), experience/opinions?

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Does anyone have opinions about or experience with Python Selector ? It looks great, but I'm a bit put off by its "Alpha" status on pypi and lack of unit tests. I mostly like that its simple, self contained, and pure WSGI. All other url routers I've found assume I'm using django, or pylons, or paste, or pull in lots of other dependencies, or just don't let me create a simple mapping of url patterns to wsgi apps. Really, all I want to do is: mapper.add("/regex/{to}/{resource}", my_wsgi_app) mapper.add("/another/.*", other_wsgi_app) ...etc... Anyways, has anyone used it before, or know of

Crash when using performSelector: with a SEL passed from another class

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问题 Is it possible to send a selector to another class and have it perform on that other class? This seems to crash with the error *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[webManager _selector]: unrecognized selector sent to instance . If this is not possible, what would you recommend as an alternative? The methods are placed in the order that they are performed. //in HomeViewController -(void)viewDidLoad { WebManager *webManager = [[WebManager alloc]

Get Raw HTML of Node in JQuery

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I have used $("#parent").html() to get the inner html of #parent , but how do I get the html of the parent itself? The use case is, I grab an input node like this: var field = $('input'); I would like to be able to get the raw html of that node ( <input type='text'> ) with something like field.html() , but that returns empty. Is this possible? Or you could create add an JQuery function like this: jQuery.fn.outerHTML = function(s) { return (s) ? this.before(s).remove() : jQuery("<p>").append(this.eq(0).clone()).html(); } so you could do this: $('input').outerHTML(); or $('input').outerHTML("new

Java NIO windows implementation

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While working on a project using the the NIO.2 AIO features I looked in the "old" NIO selector implementation and saw that on windows the default select-function is used which does not scale at all on windows due to a bad internal implementation. Everybody knows that on windows IOCP is the only real solution. Of course the callback-on-completion model does not fit into the NIO selector model but does this effectively mean that using NIO on windows is basically not a good idea ? For instance: The new AIO features include an IOCP implementation. This is especially true while using the latest

Highlight selected item on a gridview

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I am trying to highlight a selected item on a gridview (dinamically populated with an adapter), but it is not working. I did research and i even tried to copy exactly the selector of other people and even the way that they put it on the gridview but i am not being able to put it working. It just doesn't do anything. The background of each item is white (like i wanted), but when i press it (it it is on top of a textview or a imageview (part of the gridview item) it doesn't do anything. If i press out of the imageView or textview, it will do what i want. EDIT : I have listeners for the images

Java Selector returns SelectionKey with OP_READ without data in infinity loop after writing to channel

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I've trouble with my code: i've written simple SocketChannel client with Selector, after starting it successfully reads messages from server (server sends events). But after writing to socket (see main method) selector starts returning readable socket in infinyty loop, handleKey returns that -1 bytes readed, so selector all time returns OP_READ SelectionKey without data for reading. Sorry for my English. Thanks. import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.InetSocketAddress; import java.nio.ByteBuffer; import java.nio.channels

jquery access iframe id from iframe content

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i am trying to do something with jquery. i have code like this 1.html; <html> <head> <script language="javascript" type="text/javascript" src="jquery.js"></script> </head> <body> <iframe src="2.html" id="frame1"></iframe> <iframe src="3.html" id="frame2"></iframe> </body> </html> in 2.html file. i am trying to access iframe container id. 2.html file content; <html> <head> <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript"> $(document).ready(function (){ $('#btnIdKim').click(function (){ }); }); </script> </head> <body> <input type="button" name="btnIdKim"