灯角

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灯角 2024-11-02 18:25:27

我认为创建一个类来隐藏 > 是解决该问题的相当标准的方法。干得好!无需在 > 上使用 showhide 函数,它也同样容易使用 CSS 方法时,请使用 addClassremoveClass。此外,如果需要在页面加载时应用该类,可以使用 PHP 显示 > 的初始状态。

<div <? if($thisvolneed=='specify'){echo 'class="specify"';} ?>><p>Some info...</p></div>

I think creating a class to hide the <div> is a fairly standard way to approach the problem. Well done! Instead of using the show or hide function on the <div>, it is just as easy to use addClass or removeClass when using the CSS approach. Also, the initial state of the <div> can be shown by using PHP to apply the class if necessary on page load.

<div <? if($thisvolneed=='specify'){echo 'class="specify"';} ?>><p>Some info...</p></div>

php/jQuery 根据数据库中的单选按钮设置更改是否显示/隐藏

灯角 2024-11-01 22:53:51

这是一个老问题,但我不确定为什么人们不建议使用事件对象来检索信息,而不是再次搜索 DOM。

只需浏览函数 onChange 中的事件对象,请参阅下面的示例

function test() {
console.log(event.srcElement.value);
}

http://jsfiddle.net/Corsico/3yvh9wc6/5/

如果这不是 7 年前的默认行为,那么今天查找此内容的人可能会有用

This is an old question, but I am not sure why people didn't suggest using the event object to retrieve the info instead of searching through the DOM again.

Simply go through the event object in your function onChange, see example bellow

function test() {
console.log(event.srcElement.value);
}

http://jsfiddle.net/Corsico/3yvh9wc6/5/

Might be useful to people looking this up today if this wasn't default behavior 7 years ago

从“更改时选择”中获取选定的值/文本

灯角 2024-11-01 20:46:46

据我所知,只有 IE9 可以对 Windows 进行深度站点固定。对于 Mac,我听说过一些将网站/网络应用程序放入文档中并接收通知的方法。一种工具称为 Fluid:
http://fluidapp.com/

但我不知道是否有类似固定网站中的动态跳转列表的功能按钮。

From what I can see, only IE9 can do that deep kind of site pinning for Windows. For Mac, there are a few things I've heard of to put a website/webapp in the doc and receive notifications I think. One tool is called Fluid:
http://fluidapp.com/

But I don't know if that has anything like the Dynamic Jump Lists in Pinned Site buttons.

IE 9/Win 7 以外的浏览器中的固定站点

灯角 2024-11-01 20:08:20

这个答案刚才就在这里,但被删除了:

Can you acquire from UserControl 相反?这将允许您在控制表面上放置其他控件,包括您的按钮并订阅它们的事件。

This answer was here a moment ago, but got deleted:

Can you inherit from UserControl instead? This will allow you to place other controls on the control surface, including your button and subscribe to their events.

C#、容器火灾事件

灯角 2024-11-01 05:45:38

请参阅此问题:获取表单字段生成的 clientid ,这是我的答案:

我使用这个助手:

public static partial class HtmlExtensions
{
    public static MvcHtmlString ClientIdFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression)
    {
        return MvcHtmlString.Create(htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldId(ExpressionHelper.GetExpressionText(expression)));
    }
}

就像使用任何其他助手一样使用它:@Html.ClientIdFor(model=>model.client.email)

See this question: get the generated clientid for a form field, this is my answer:

I use this helper:

public static partial class HtmlExtensions
{
    public static MvcHtmlString ClientIdFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression)
    {
        return MvcHtmlString.Create(htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldId(ExpressionHelper.GetExpressionText(expression)));
    }
}

Use it just as you would any other helper: @Html.ClientIdFor(model=>model.client.email)

在 EditorTemplates 中从 Html.TextBoxFor 检索 ClientId

灯角 2024-11-01 02:36:35

这是为什么呢?

除非您声明一个,否则编译器会在您的类中声明一个 operator=,其签名为 operator= (C&, C&)operator= (C&, const C&)

如果允许您重载分配,则大多数用途将是不明确的。

然后,您可能会游说附加规则来执行以下任一操作:

  • 如果用户声明了一个可见的operator=,则假装没有声明编译器,就像非成员 operator= 隐藏成员 operator=
  • 使您的用户声明的赋值在重载期间更好匹配。

这两种选择都会使本来就极其复杂的规则变得复杂,只为 operator= 添加一个特殊情况。

很少有人愿意去那里。

而且您还没有公开此功能的合法用途。

或者,任何合理的用途。

当可以展示一些合理的用例时,C++ 规则只会变得更加复杂。

Why is this?

Unless you declare one, the compiler declares an operator= in your class with signature operator= (C&, C&) or operator= (C&, const C&).

If you were allowed to overload assignment, most uses would be ambiguous.

Then you would likely lobby for additional rules to either:

  • pretend there is no compiler declared operator= if a user declared one is visible, as if the non-member operator= hides the member operator=
  • make your user declared assignment a better match during overloading.

Both choices would complicate rules that are already extremely complicated, adding a special case just for operator=.

Few people want to go there.

And also you haven't exposed a legitimate use for this feature.

Or, any reasonable use at all.

The C++ rules are only made even more complicated when some reasonable use-case can be showed.

重载运算符=作为非成员

灯角 2024-11-01 01:54:57

这是我的示例解决方案:

-module(transp).

-export([transpose/1]).

transpose(L) ->
     transpose_do([], L).

transpose_do(Acc, [[]|_]) ->
     lists:reverse(Acc);
transpose_do(Acc, M) ->
     Row = lists:foldr(
          fun(Elem, FoldAcc) ->
                    [hd(Elem) | FoldAcc]
          end,
          [],
          M),
     transpose_do([Row|Acc], lists:map(fun(X) -> tl(X) end, M)).

测试:

1> M = [[a1,a2,a3],[b1,b2,b3],[c1,c2,c3]].
[[a1,a2,a3],[b1,b2,b3],[c1,c2,c3]]
2> transp:transpose(M).   
[[a1,b1,c1],[a2,b2,c2],[a3,b3,c3]]

Here's my sample solution:

-module(transp).

-export([transpose/1]).

transpose(L) ->
     transpose_do([], L).

transpose_do(Acc, [[]|_]) ->
     lists:reverse(Acc);
transpose_do(Acc, M) ->
     Row = lists:foldr(
          fun(Elem, FoldAcc) ->
                    [hd(Elem) | FoldAcc]
          end,
          [],
          M),
     transpose_do([Row|Acc], lists:map(fun(X) -> tl(X) end, M)).

Test:

1> M = [[a1,a2,a3],[b1,b2,b3],[c1,c2,c3]].
[[a1,a2,a3],[b1,b2,b3],[c1,c2,c3]]
2> transp:transpose(M).   
[[a1,b1,c1],[a2,b2,c2],[a3,b3,c3]]

在 Erlang 中转置二维矩阵

灯角 2024-11-01 01:35:27

当我第一次开始使用 card.dll 时,我使用枚举来表示花色和牌排名,但后来我不想处理同样的问题并编写额外的代码来补偿字符串,因此我写了一个摘要只有两个变量的 Info 类
(Flag (byte)) 和 (Name(string)) 由 Rank 类和 Suit 类实现,它们将是 Card 类的成员。我发现这对于命名约定和过滤目的来说效果更好。我喜欢使用枚举,但必须解决变量命名可能会很麻烦,所以有时如果您必须将变量名称作为字符串获取,最好不要这样做。

因此,当调用 Card 构造函数时,输入卡 ID,然后将其传递到 Rank 和 Suit,然后将代码中的 ID 含义分开 (101 = 100 (suit flag) +
1(排名标志))。受保护的抽象 SetName(int cardID) 和 SetFlag(int cardID) 同时通过 Rank 和 Suit 在信息的构造函数中处理其余部分。枚举不再有问题,仍然可以通过标志按数字进行过滤。

When I first started on the card.dll, I was using enumerations for suits and card rankings but then I didn't want to have to deal with that same issue and writing extra code to compensate for the strings, there for I wrote a abstract class Info with only two variables
(Flag (byte)) and (Name(string)) to be implemented by the Rank class and Suit class which would be members of the Card class. I have found this to work a lot better for naming conventions and filtering purposes. I love using enums but having to work around variable naming can be a hassle so sometimes it is best not to if you have to get the variable name as string.

So when the Card constructor get called the card ID is entered and then it passes into the Rank and Suit which will then separate what the ID means in code (101 = 100 (suit flag) +
1 (rank flag)). The protected abstract SetName(int cardID) and SetFlag(int cardID) while handle the rest from there in the info's constructor via Rank and Suit. No more issues with the enumeration and it can still be filtered by number via the Flag.

在 C# 中表示游戏卡类的最佳方式

灯角 2024-10-31 13:10:53
  1. 我不建议使用内联 SQL 查询。请改用存储过程并传递参数。

  2. 如果您传递文本 - 您将获得显示值...如果您想传递基础值,则使用“SelectedValue”

  3. 但是要解决您的问题,请使用参数。

  1. I would not recommend using inline SQL query. Use Stored Procedure instead and pass parameters.

  2. If you pass Text - you will get the display value... if you want to pass the underlying value, then use "SelectedValue"

  3. However to resolve your issue, use parameters.

如何在 VB.NET 中使用此 SQL UPDATE 查询

灯角 2024-10-31 03:49:55

保留名称为 AUX、CLOCK$、COM1、COM2、COM3、COM4、COM5、COM6、COM7、COM8、COM9、CON、LPT1、LPT2、LPT3、LPT4、LPT5、LPT6、LPT7、LPT8、LPT9、 NUL 和 PRN。

您将无法在 Windows 上的任何文件系统上创建具有这些名称(以及任何扩展名,例如 COM2.txt)的文件 - 这是 Windows 内核强制执行的事情,对于 向后兼容 CP/M。这可能是一个限制 在 FAT 文件系统上有效,但在 NTFS 上则不然。

虽然 ,您可以尝试使用 UNC 文件名,这些应该可以工作:

echo test > com2.txt
-> The system cannot find the file specified.

echo test > \\mypc\c$\Users\Michael\Desktop\com2.txt
-> works flawlessly

我不能 100% 确定 UNC 路径是否适用于文件流,但肯定有一种方法可以在 .net 中使用它们。

The reserved names are AUX, CLOCK$, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, CON, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, LPT9, NUL and PRN.

You won't be able to create files with these names (and with any extension, e.g. COM2.txt on Windows on any File System - that's a Windows Kernel enforced thing, for backwards compatibility with CP/M. It MAY be a limitation on FAT filesystems though, but it's not on NTFS. See Wikipedia for some more info.

However, you can try to use UNC File Names, these should to work:

echo test > com2.txt
-> The system cannot find the file specified.

echo test > \\mypc\c$\Users\Michael\Desktop\com2.txt
-> works flawlessly

I'm not 100% sure if UNC Paths work with File Stream, but there certainly is a way to use them in .net.

写入具有设备名称的文件

灯角 2024-10-30 16:35:52

也许数值食谱会给你一个想法。提示:它是递归的。

Maybe Numerical Recipes will give you an idea. Hint: it's recursive.

我如何在 C++ 中使用此函数原型实现二分方法

灯角 2024-10-30 01:16:25

可能会发生一些事情。但我的猜测是,您在 .h 文件中省略了“槽”:

public slots:
    void pushButtonClicked();

没有它,代码将编译并运行,但该函数不是槽。所以“连接”命令将会失败。

There could be a couple things happening. But my guess is that you've omitted 'slots' in your .h file:

public slots:
    void pushButtonClicked();

Without that, the code will compile and run, but the function isn't a slot. So the 'connect' command will fail.

将 QLCDNumber 连接到 QSpinBox

灯角 2024-10-29 23:48:48

领域驱动设计是一种用于开发复杂系统的方法和流程规定,其重点是将问题域中的活动、任务、事件和数据映射到解决方案域的技术工件。

领域驱动设计的重点是理解问题域,以便创建问题域的抽象模型,然后可以在一组特定的技术中实现该模型。领域驱动设计作为一种方法论,为模型开发和技术开发如何产生一个既能满足使用人员的需求,又能在面对问题领域的变化时保持稳健的系统提供了指导。

领域驱动设计的流程方面涉及领域专家(了解问题领域的人员)和设计/架构专家(了解解决方案领域的人员)之间的协作。这个想法是建立一个具有共享语言的共享模型,以便当来自这两个不同领域的人们以两种不同的视角讨论解决方案时,他们实际上是在讨论具有共享概念的共享知识库。

需要特定系统的人员与设计和实施该系统的人员之间缺乏共同的问题领域理解似乎是项目成功的核心障碍。领域驱动设计是解决这一障碍的一种方法。

它不仅仅是拥有一个对象模型。重点实际上是共享沟通和改进协作,以便可以发现问题领域内的实际需求,并创建适当的解决方案来满足这些需求。

领域驱动设计:好的和具有挑战性的通过以下评论提供了简要概述:

DDD 有助于发现顶层架构并告知
软件需要的领域的力学和动力学
复制。具体来说,这意味着出色的 DDD 分析
最大限度地减少领域专家和软件之间的误解
架构师,它减少了后续昂贵请求的数量
为了改变。通过将域复杂性分解为较小的上下文,
DDD 避免强迫项目架构师设计臃肿的对象
模型,这是在锻炼中浪费大量时间的地方
实施细节——部分原因是实体数量
处理的内容通常会超出会议室白板的大小。

另请参阅这篇文章服务架构的领域驱动设计,其中提供了一个简短的例子。本文提供了领域驱动设计的以下缩略图描述。

领域驱动设计提倡基于实际的建模
与我们的用例相关的业务。由于现在年纪越来越大并且
炒作程度降低,我们中的许多人忘记了 DDD 方法确实
有助于理解手头的问题并设计软件
对解决方案的共同理解。在构建应用程序时,
DDD 将问题视为域和子域。它描述了
将问题的独立步骤/区域作为有界上下文,强调
通用语言来谈论这些问题,并添加了许多技术
概念,如实体、值对象和聚合根规则
支持实施。

Martin Fowler 撰写了许多文章,其中提到了领域驱动设计作为一种方法。例如,本文 BoundedContext 概述了领域驱动开发中的有界上下文概念。

在那些年轻的日子里,我们被建议建立一个统一的模型
整个业务,但 DDD 认识到我们已经了解到“总
大型系统的领域模型的统一不会
可行或具有成本效益”1 因此 DDD 划分了一个大的部分。
将系统划分为限界上下文,每个限界上下文都可以有一个统一的模型 -
本质上是构建 MultipleCanonicalModel 的一种方法。

Domain Driven Design is a methodology and process prescription for the development of complex systems whose focus is mapping activities, tasks, events, and data within a problem domain into the technology artifacts of a solution domain.

The emphasis of Domain Driven Design is to understand the problem domain in order to create an abstract model of the problem domain which can then be implemented in a particular set of technologies. Domain Driven Design as a methodology provides guidelines for how this model development and technology development can result in a system that meets the needs of the people using it while also being robust in the face of change in the problem domain.

The process side of Domain Driven Design involves the collaboration between domain experts, people who know the problem domain, and the design/architecture experts, people who know the solution domain. The idea is to have a shared model with shared language so that as people from these two different domains with their two different perspectives discuss the solution they are actually discussing a shared knowledge base with shared concepts.

The lack of a shared problem domain understanding between the people who need a particular system and the people who are designing and implementing the system seems to be a core impediment to successful projects. Domain Driven Design is a methodology to address this impediment.

It is more than having an object model. The focus is really about the shared communication and improving collaboration so that the actual needs within the problem domain can be discovered and an appropriate solution created to meet those needs.

Domain-Driven Design: The Good and The Challenging provides a brief overview with this comment:

DDD helps discover the top-level architecture and inform about the
mechanics and dynamics of the domain that the software needs to
replicate. Concretely, it means that a well done DDD analysis
minimizes misunderstandings between domain experts and software
architects, and it reduces the subsequent number of expensive requests
for change. By splitting the domain complexity in smaller contexts,
DDD avoids forcing project architects to design a bloated object
model, which is where a lot of time is lost in working out
implementation details — in part because the number of entities to
deal with often grows beyond the size of conference-room white boards.

Also see this article Domain Driven Design for Services Architecture which provides a short example. The article provides the following thumbnail description of Domain Driven Design.

Domain Driven Design advocates modeling based on the reality of
business as relevant to our use cases. As it is now getting older and
hype level decreasing, many of us forget that the DDD approach really
helps in understanding the problem at hand and design software towards
the common understanding of the solution. When building applications,
DDD talks about problems as domains and subdomains. It describes
independent steps/areas of problems as bounded contexts, emphasizes a
common language to talk about these problems, and adds many technical
concepts, like entities, value objects and aggregate root rules to
support the implementation.

Martin Fowler has written a number of articles in which Domain Driven Design as a methodology is mentioned. For instance this article, BoundedContext, provides an overview of the bounded context concept from Domain Driven Development.

In those younger days we were advised to build a unified model of the
entire business, but DDD recognizes that we've learned that "total
unification of the domain model for a large system will not be
feasible or cost-effective" 1. So instead DDD divides up a large
system into Bounded Contexts, each of which can have a unified model -
essentially a way of structuring MultipleCanonicalModels.

什么是领域驱动设计?

灯角 2024-10-29 21:28:34

这是 WPF 早期版本中由事件跳跃引起的已知错误。它针对 .NET 4.0 中的选择器派生控件进行了修复。

有关更多详细信息,请参阅此博客文章:http://blogs.interknowlogy.com/ 2011/03/09/事件-跨越式/

This is a known bug in the early versions of WPF caused by event leapfrogging. It was fixed for the Selector-derived controls in .NET 4.0.

See this blog post for more details: http://blogs.interknowlogy.com/2011/03/09/event-leapfrogging/

WPF、MVVM 和 ComboBox:更改为不同的视图模型时,ComboBox 会将绑定到 SelectedItem 的属性清空

灯角 2024-10-29 20:26:39

我认为你的问题是你为整个应用服务器分配了1G-2G堆大小。它本身会消耗一些内存,不确定多少。但是,如果您以最大 2G 内存启动应用程序服务器,那么您的 Web 应用程序可用内存肯定少于 2G。

I think your problem is that you allocate 1G-2G heap size for the whole App server. It consumes some memory by itself, not sure how much. But if you start the App server with max 2G memory you will have definetly less than 2G available for your webapp.

java OutOfMemory 问题 - 堆转储比配置的最大堆小 800 Mb

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