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javascript - Detecting an undefined object property

What's the best way of checking if an object property in JavaScript is undefined? Question&Answers:os...

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android - Can't create handler inside thread that has not called Looper.prepare()

What does the following exception mean; how can I fix it? This is the code: Toast toast = Toast.makeText( ... ) at android.widget.Toast.makeText(Toast.java:231) Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - When to use static methods

I am wondering when to use static methods? Say if I have a class with a few getters and setters, a method or ... Is this the static way? I'm rather confused! Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Implementing INotifyPropertyChanged - does a better way exist?

Microsoft should have implemented something snappy for INotifyPropertyChanged, like in the automatic properties, just ... code to raise PropertyChanged event? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Get all non-unique values (i.e.: duplicate/more than one occurrence) in an array

I need to check a JavaScript array to see if there are any duplicate values. What's the easiest way ... unique values in a JavaScript array (remove duplicates) Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Retrieve the position (X,Y) of an HTML element

I want to know how to get the X and Y position of HTML elements such as img and div in JavaScript. Question&Answers:os...

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bitmap - How to load an ImageView by URL in Android?

Closed. This question needs to be more focused. It is not currently accepting answers. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jsf - What can <f:metadata>, <f:viewParam> and <f:viewAction> be used for?

Can anyone clarify how we can use in general, or a in real world example, this snippet? <f:metadata> <f:viewParam id ... action="#{bean.init}" /> </f:metadata> Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - printf anomaly after "fork()"

OS: Linux, Language: pure C I'm moving forward in learning C programming in general, and C programming under UNIX in ... it correct behaviour, or is it a bug? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - CS0120: An object reference is required for the nonstatic field, method, or property 'foo'

Consider: namespace WindowsApplication1 { public partial class Form1 : Form { public Form1() { ... property 'WindowsApplication1.Form1.setTextboxText(int) Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Why don't self-closing script elements work?

What is the reason browsers do not correctly recognize: <script src="foobar.js" />  ... at least for all IE (6-8 beta 2). Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Why did my Git repo enter a detached HEAD state?

I ended up with a detached head today, the same problem as described in: git push says everything up-to-date even ... how did I end up with a detached HEAD? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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closures - What is the purpose of a self executing function in javascript?

In javascript, when would you want to use this: (function(){ //Bunch of code... })(); over this: //Bunch of code... Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Is there a difference between copy initialization and direct initialization?

Suppose I have this function: void my_test() { A a1 = A_factory_func(); A a2(A_factory_func()); double b1 = ... cite text as proof. Also add other cases please. Question&Answers:os...

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vba - Why does Range work, but not Cells?

I'm trying to move some data from one workbook into another by assigning the values from one range to another. When ... is some other problem I'm not aware of? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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command line - Including all the jars in a directory within the Java classpath

Is there a way to include all the jar files within a directory in the classpath? I'm trying java -classpath ... add each jar file to the classpath separately? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Is gcc 4.8 or earlier buggy about regular expressions?

I am trying to use std::regex in a C++11 piece of code, but it appears that the support is a bit buggy. ... to implement multiple alternatives, e.g. (st|mt)|tr. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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MySQL Creating tables with Foreign Keys giving errno: 150

I am trying to create a table in MySQL with two foreign keys, which reference the primary keys in 2 ... engine=InnoDB; Any help would be greatly appreciated. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bash - Why does shell ignore quoting characters in arguments passed to it through variables?

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asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Are variables declared with let or const hoisted?

I have been playing with ES6 for a while and I noticed that while variables declared with var are hoisted ... difference between let and const in this matter? Question&Answers:os...

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Angular/RxJS When should I unsubscribe from `Subscription`

When should I store the Subscription instances and invoke unsubscribe() during the ngOnDestroy life cycle and when can I ... () { this.sub.unsubscribe(); } Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Activity restart on rotation Android

In my Android application, when I rotate the device (slide out the keyboard) then my Activity is restarted ( ... just portrait so that onCreate is not called. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How do I make the first letter of a string uppercase in JavaScript?

How do I make the first letter of a string uppercase, but not change the case of any of the other letters? For ... Eiffel Tower" "/index.html" → "/index.html" Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ios - How do I create delegates in Objective-C?

I know how delegates work, and I know how I can use them. But how do I create them? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How does Python's super() work with multiple inheritance?

I'm pretty much new in Python object oriented programming and I have trouble understanding the super() function ... with Python method resolution order (MRO). Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Running Bash commands in Python

On my local machine, I run a python script which contains this line bashCommand = "cwm --rdf test.rdf --ntriples > ... Does anyone have a clue what's going on? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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objective c - How can I disable ARC for a single file in a project?

I am using ARC successfully in my project. However, I have encountered a few files (e.g., in unit tests and mock ... How do I disable ARC on a per-file basis? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Join vs. sub-query

I am an old-school MySQL user and have always preferred JOIN over sub-query. But nowadays everyone uses sub- ... and therefore is there nothing to worry about? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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