unchecked | 易学教程

Uncheck parent checkbox if one child is unchecked

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问题 I am developing an application that requires the value of multiple checkboxes. I have nested lists containing checkboxes. The current functionality is this: When a parent is checked, all children are checked under it. When a child is checked, the parent is not selected. I need to add this functionality: When a child is unchecked after the parent is checked, the parent unchecks, but leaves the children checked. $('input[name="level-1"],input[name="level-2"]').bind('click', function () { $(

Recursive generics

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问题 Is there a way to make this method properly generic and do away with the warnings? /** * <p>Sort a collection by a certain "value" in its entries. This value is retrieved using * the given <code>valueFunction</code> which takes an entry as argument and returns * its value.</p> * * <p>Example:</p> * <pre>// sort tiles by number *Collects.sortByValue(tileList, true, new Function<Integer,NormalTile>() { * public Integer call(NormalTile t) { * return t.getNumber(); * } *});</pre> * * @param list

checkbox inside div. On click checked or unchecked using jquery 1.9.1

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问题 Hi i want to make checkbox checked or unchecked when i click div with text. Using jquery 1.9.1 here is a link to js fiddle <div class="tel_show"> <input type="checkbox" name="whatever" /> visible </div> $("div.tel_show").live("click",function(event) { var target = $(event.target); if (target.is('input:checkbox')) return; var checkbox = $(this).find("input[type='checkbox']"); if( checkbox.attr("checked") == "" ){ checkbox.attr("checked","true"); } else { checkbox.attr("checked",""); } }); js

Type safety: Unchecked cast from Object

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问题 I try to cast an object to my Action class, but it results in a warning: Type safety: Unchecked cast from Object to Action<ClientInterface> Action<ClientInterface> action = null; try { Object o = c.newInstance(); if (o instanceof Action<?>) { action = (Action<ClientInterface>) o; } else { // TODO 2 Auto-generated catch block throw new InstantiationException(); } [...] Thank you for any help 回答1: Yes - this is a natural consequence of type erasure. If o is actually an instance of Action<String

How to use multiple uncheckeds in c#

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问题 Is there a way to use unchecked for a whole program or a whole block ? I'm translating something from java that has the type long and lots of comparisons with constants that are unsigned long... Some places there a some switch's with 20~30 cases... Do I have to uncheck every case individualy or is there a faster/easier way to do it? case 101: return jjMoveStringLiteralDfa5_0(active0, 0x8002010000000000L, active1, 0x1L); I have to change to: return jjMoveStringLiteralDfa5_0(active0, unchecked(

Checkbox checked or unchecked boolean php mysql

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问题 I am trying to make this form with checkboxes get values 1 or 0, sort of a boolean, and UPDATE it on mysql, but I havent found a way yet. Maybe you can help. I'll post the form and the code that receives it. I am sure there might be a conflict of loops, but I tryed everything and couldnt get it working. Tks in advance. THE FORM <form action="esconde_cat.php" method="post"> <table width="300px" align="center" width="140" border="1"> <tr> <td></td> <td width="200">Categoria</td> <td width="100"

EventSource with Map<Class<? extends Event>, List<EventListener<? extends Event>> without unchecked call

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问题 I need to implement Observer pattern with List of listeners per Event class. I have: empty interface Event public interface Event {} interface for Listeners: public interface EventListener<T extends Event> { void handle(T event); Class<T> getEventClass();} and event source: public class EventSource { private final Map<Class<? extends Event>, List<EventListener<? extends Event>>> listeners = new HashMap<>(); public <T> void subscribe(EventListener<? extends Event> listener) { Class<? extends

Java unchecked operation cast to generic

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问题 I am wondering why the following issues a warning about an unsafe / unchecked operation: Map<String, ProxySession> sessionMap = (Map<String, ProxySession>) se.getSession().getServletContext().getAttribute("myattribute"); Is the cast wrong? I can't understand what I am missing here. P.S. I don't want to get rid of the warning, I want to understand the unsafe operation. Thanks! 回答1: It means that the cast will check that the returned object is a Map of some kind, but it won't be able to check

Weird result from unchecked(), possible compiler bug?

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问题 The following snippet evaluates to zero: int result = unchecked((int)double.MaxValue); Whereas, if you do this: double x = double.MaxValue int result = (int)x; The result is (would you even guess this?) int.MinValue . That fact alone is weird enough[see below], but I was under the impression that unchecked was meant to force the compiler into emitting code that pretends not to know that a conversion will definitely fail and/or some overflow happens. In other words, it should give the same

How to detect that a user has unchecked a checkbox?

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The following form: <form action="x.php" method="get" id="myForm">Subscribe: <div id="radioButtonsWithAdds"> <input type="radio" name="group1" value="one">One month 2,99$ <input type="radio" name="group1" value="two"> Two months 5,98$</div><br> <input type="checkbox" name="option1" value="withAdds" checked> with adds <img src="next.png" border="0" alt="enviar" onclick="document.getElementById('myForm').submit();"> </form> Is the first part of a subscription from. In here, the user may choose between one month or two months subscription. If the user agrees to receive adds, leaves the checkbox