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ajax – 您认为Progressive Enhancement有多重要?(ajax重要性)

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对于ajax–您认为ProgressiveEnhancement有多重要?感兴趣的读者,本文将会是一篇不错的选择,我们将详细介绍ajax重要性,并为您提供关于10QuestionsToMakeProg

对于ajax – 您认为Progressive Enhancement有多重要?感兴趣的读者,本文将会是一篇不错的选择,我们将详细介绍ajax重要性,并为您提供关于10 Questions To Make Programming Interviews Less Expensive--reference、AJAX 利用 XHR2 Progress Event 實作下載進度列、AJAX——ASP.NET AJAX(三)ScriptManagerProxy,Timer和UpdateProgress、android-从PreferenceActivity或PreferenceFragment中的资源添加特定的命名SharedPreferences的有用信息。

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ajax – 您认为Progressive Enhancement有多重要?(ajax重要性)

ajax – 您认为Progressive Enhancement有多重要?(ajax重要性)

Progressive Enhancement是一种Web开发方法,不仅允许更大的可移植性和可访问性,而且在我看来,使开发过程更容易.

我想知道的是社区其他人对这种方法的看法.

特别是:您认为Web应用程序应该支持的最小技术集合是什么?

解决方法

如果它仍然可以在纯文本浏览器中使用(当然没有CSS和Javascript),也可以在屏幕阅读器中使用,那么你就是在正确的轨道上.但这些都是你能找到的最高标准:)

10 Questions To Make Programming Interviews Less Expensive--reference

10 Questions To Make Programming Interviews Less Expensive--reference

Conducting sql Expert and next one is the full stack developer you are looking for. If you have trust them blindly and invite disappointed. One of the first thing you should do is to filter candidates who claims to have certain skills e.g. sql but doesn't have them,the faster you can weed out those candidates the cheaper will be the hiring process. A  is just for that purpose,it doesn't cost you much and also suitable for candidate,as they don't have to take off and come down to your office. It's flexible for both the parties. When I phone interview someone,I spent fist few minutes to listen them and then I go for my list of weed out programming question to see if candidate is good enough to spend another 30 to 40 minutes. They have saved a lot of time,where I found out that candidate having words like "Strong knowledge of Java","Exceptional in SQL" and "Programming gurus" fail to answer these simple questions. If you are a candidate and gone through couple of interviews,you might have noticed that almost all interviewers make up their minds in the first 10 minutes. The rest of the interview gives them reasons supporting said decision,but not all is lost. If you ever feel that you have messed up with your chance,try coming of some really good answers on rest of questions,if you can impress interviewer to an extent that encourage you to go deep,you may be able to change his initial decision. To get some feedback and improve upon my method,I have decided to share my list of weed out programming questions (don't bother about sharing questions,I have many similar questions on my secret question bank and you can create them easily as well). I have chosen one or two question from 

decoration: underline;">10 Questions to Start Your Programming Interview

sql expert who can't write JOIN queries.,My first weed out question is asking them to describe a . They don't have to get it exactly right,I just  Developer the first weed out question is to explain . Here at minimum I want then to kNow is that a GET is what you generally see in the URL and a POST is commonly what you see in HTML Forms. Again depending upon their answer,you can also further question about limitation,security and usage of GET vs POST method. This question will give you enough hint that whether they really kNow something about internet or not.,one of the popular weed out question is rather simple,how do you find a particular process and kill it? Here I expect them to tell me about ps, grep and kill. Also to gauge their level of understanding you can ask them about ps options e.g. what does a,f and e means in ps -afe command. Second level weed out question in UNIX can be about  e.g. files which are greater than 2GB etc. Don't get me wrong but if a person cannot answer these question,it would be difficult for him to work in a project which has tons of process and connected to tons of other server. One counter argument question against my weed out question,I always hear that it would take just 5 minutes to learn those commands,but they fail to answer me,when I said why they didn't spent those five minutes before coming to interview.

 
 

(Object Oriented Programming),my weed out question is  Here I expect slightly more than the popular deFinition of classes are blue print to create objects,yes that's correct but how do you kNow that he understood the concept and not just have mugged it,Ask him to give examples,and then cross question him on that e.g. where does object get created,who creates it etc. ,particularly when it comes to code,the most popular question to weed out the non-programming programmer is . If a programmer cannot write a Fizz-buzz in 10 to 15 minutes,he probably needs more practice and not ready yet. This is something I don't ask on phone interview but on written test I have before face to face interviews. There has been instances in past before we had a proper interview process of multiple rounds where I had literally asked Fizzbuzz,and their answer took the better part of an hour. Another weed out question in my list for programming is to have them write  and ask them to optimize it. Fibonacci is very common but you would be surprise with number of programmers failing to write in using pen and paper and even on IDE. It also weed out programmers who understand recursion than who doesn't. My experience is the programmer who understand recursion are usually better than those who doesn't. This is where most of natural programmers comes in.,my weed out question is Some one may say that it slightly harsh to judge someone's XML skill with just one question,but you would agree that this is a fundamental. I kNow there are many programmer who has worked in XML and can work in XML but doesn't familiar with this fundamental but shouldn't it's their responsibility to learn fundamental like this,just working is not enough,you also need to fill your gap.,my weed out question is  It's such a fundamental that I expect anyone who has worked or learned Java should know about it. Here I expect that they should mention about some tools which comes with JDK,at least javac (the Java compiler) and JVM,which actually runs every Java program.  One more question in my list to weed out non Java programmer is  I have hard time teaching this fundamental to couple of people and have found that if you don't kNow difference between these two,you will struggle to set-up your project,debugging and fixing those nightmarish ClassNotFoundException and NoClassDefFoundError. It's again a must kNow detail for any one who claims to work in Java. be it in Java or any other language,one of the good weed out question is asking candidate to . You can ask this question differently either by giving him a practical scenario or just asking about how to code so that deadlock doesn't happen. If you have not done many interviews,you will be surprised with how many programmers,with professional experience of 2 to 4 years fail to answer this question correctly.,the first question I ask to candidate is about ,because I believe that as a programmer you must know array,linked list,set,map and string algorithms. If you want to add another level of cushion than you can also ask about  without using any library function. This will give you enough idea whether to proceed further or not.

 trivia is not a good way to find a programmers,but questions which are closely related to practical experience are good way to weed out someone who claims to kNow something but not there yet. The best way to find a programmer is to sit down with them and examine their projects,or have them to pair program with you. Ask them what part are they most proud of and ask them what part they would change,why they would change it and how they would change it. Once you do this,other than personality questions their is nothing more that you need to ask to gauge their ability to program. But if you do this with 100 programmers,you are not wasting lot of your time but also your organization time and money. Before you invite programmer for face to face interview,you must ensure they deserved to be there. It's not practical to call all the guys based upon their agents claim only. Let me kNow what are you set of weed out questions,what do you ask to C, C++, Ruby, Python or JavaScript developer to check whether they deserve your time or not.Read more: 

费波那契数列(:Successione di Fibonacci),又译费波拿契数斐波那契数列斐波那契数列黄金分割数列

上,费波那契数列是以的方法来定义:

  • (n≧2)

用文字来说,就是费波那契数列由0和1开始,之后的费波那契系数就由之前的两数相加。首几个费波那契系数是(OEIS

):

, , , , , , , , , , , , ……

特别指出:不是第一项,而是第零项。

源自:http://zh.wikipedia.org/wiki/%E6%96%90%E6%B3%A2%E9%82%A3%E5%A5%91%E6%95%B0%E5%88%97

AJAX 利用 XHR2 Progress Event 實作下載進度列

AJAX 利用 XHR2 Progress Event 實作下載進度列

AJAX 也有 Progress Bar

在 Web 開發環境下,我們常會利用AJAX技術提昇網頁反應速度與使用者體驗。這樣的作法在桌面環境的網路情況,通常不會有太大的問題,但是到了網路品質不佳的行動裝置環境,就容易造成反效果。以前的作法都是跳出「載入中...」等等之類的提示訊息,無法告訴使用者要等多久,但其實在XHR2(XMLHttpRequest Level 2) 的規範下就已經有定義了Progress Event事件,好讓我們在發送非同步請求時,也能即時得知資料傳送狀態。

原生 JavaScript 實作

JavaScript 實作方式如下,下面的範例利用了 Progress Tag 來顯示進度列。

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<!DOCTYPE html>
<html> <head> <title> XMLHttpRequest Download Progress </title> </head> <body> <progress id = "p" > </progress> <script> var progressBar = document . getElementById ( 'p' ) , client new XMLHttpRequest ( ; client open 'GET' 'your-download-file.dat' ; . onprogress function ( event ) { if lengthComputable { progressBar max total ; value loaded ; } } ; onloadend { ; ; send ; </script> </body> <html>

jQuery 實作 Download Progress Bar

我們最常用的 jQuery 也同樣可以實作,範例程式碼如下:

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AJAX——ASP.NET AJAX(三)ScriptManagerProxy,Timer和UpdateProgress

AJAX——ASP.NET AJAX(三)ScriptManagerProxy,Timer和UpdateProgress

上两篇博客简单学习了ScriptManagerUpdatePanel两个异步刷新的核心控件,这篇博客继续学习ASP.NET AJAX框架中的其它三个控件。


一,首先看ScriptManagerProxy控件,它和ScriptManager非常相似,那为什么它出现呢?ASP.NETAJAX中,由于一个ASPX页面上只能有一个ScriptManager控件,所以在有母版页的情况下,如果需要在Master-PageContent-Page中需要引入不同的脚本时,这就需要在Content-page中使用ScriptManagerProxy。这就是它俩的主要区别。

    <asp:ScriptManagerProxy ID="ScriptManagerProxy1" runat="server">
    </asp:ScriptManagerProxy>

二,Timer控件,这个大家应该不陌生,在VBC#中当中,我们经常用它,在这里他也同样一样,只不过是异步刷新而已。很简单的例子,只要把他放在UpdatePanel控件里,就能实现局部刷新的秒表功能:


	<body>
	    <form id="form1" runat="server">
			<asp:ScriptManager ID="ScriptManager1" runat="server">
			</asp:ScriptManager>
	
			<asp:UpdatePanel ID="UpdatePanel1" runat="server">
				<ContentTemplate>
					<%= DateTime.Now %>
					<asp:Timer ID="Timer1" runat="server" Interval="1000">
					</asp:Timer>
				</ContentTemplate>
			</asp:UpdatePanel>
	    </form>
	</body>

三,UpdateProgress控件:

1,提出原因:在现实的网络中,当我们打开某一个网站或链接时,由于种种原因经常要等待页面显示出来,这样的用户体验真的很差。如果能在页面执行较长时间操作的同时,给用户提供一个类似于浏览器状态栏那样的进度条,将会很大地改善用户体验。所以微软在ASP.NETAjax中为我们提供了UpdateProgress控件,它可以轻松的实现这样的功能。

2,简介:UpdateProgress控件用于当页面异步更新数据时,显示给用户友好的提示信息。该信息可以是文本信息,也可以是图片信息,用户可以根据自己的项目需要或自己的意愿进行选择。该控件的简单定义形式如下所示:


	<asp:UpdateProgress ID="UpdateProgress1" runat="server" DynamicLayout="false" AssociatedUpdatePanelID="UpdatePanel1">
		<Progresstemplate>
			表示进度的信息
		</Progresstemplate>
	</asp:UpdateProgress>

3,看一下它的几个常用属性:

属性

说明

AssociatedUpdatePannelID

该属性和该UpdateProgress相关联的UpdatePanelID,通常用于有多个UpdatePanel的情况下

displayAfter

进度信息被展示后的ms

DynamicLayout

UpdateProgress控件是否动态绘制,而不占用网页空间

具体的使用,需要根据实际情况,把我们的一些表示进度的图片也好,文字也好,写到我们的UpdateProgressProgresstemplate中即可,可以指定UpdatePanel来进行测试!!!

这三个控件相对来说简单一些,但是也都非常有用。很好的配合UpdatePanelScriptManager来进行局部异步刷新,可以大大提高用户的体验度!综上为ASP.NETAJAX框架中的五个控件的简单学习,还需要在实际项目中来锻炼提高,加深理解!!!

android-从PreferenceActivity或PreferenceFragment中的资源添加特定的命名SharedPreferences

android-从PreferenceActivity或PreferenceFragment中的资源添加特定的命名SharedPreferences

如果我具有Preference-Activity或-Fragment,则可以提供preference.xml文件来构建我的PreferenceScreen,并通过addPreferenceFromresource(R.xml.preference)进行显示.

然后可以通过PreferenceManager.getDefaultSharedPreferences(Context)检索更改的值.

我只是想知道是否可以将片段的默认首选项设置为默认值.

我希望有一个PreferenceFragment能够将其首选项(通过xml提供)存储在可以通过context.getSharedPreferences(“ customPrefName”,Context.MODE_PRIVATE)检索的Preferences中.
但是我在xml中找不到类似的东西

<PreferenceScreen android:prefName="customPrefName">...

解决方法:

如果要具有自定义首选项xml文件,则需要设置首选项名称,然后再将其从PreferenceFragment类的xml添加到屏幕.

public class CustomNamePreferenceFragment extends PreferenceFragment {

    private static final String PREF_FILE_NAME = "custom_name_xml";

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        PreferenceManager preferenceManager = getPreferenceManager();
        preferenceManager.setSharedPreferencesName(PREF_FILE_NAME);
        addPreferencesFromresource(R.xml.prefs);
        ... //rest of the code
    }
}

注意:您需要在onCreate()的超级调用之后和调用addPreferencesFromresource()方法之前设置共享首选项名称.

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