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Q&A

Welcome to Software Development on Codidact!

Will you help us build our independent community of developers helping developers? We're small and trying to grow. We welcome questions about all aspects of software development, from design to code to QA and more. Got questions? Got answers? Got code you'd like someone to review? Please join us.

General Q&A about programming, scripting, software design & architecture, process, tools, testing, and more.

Filters (None)
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How to fire the change event for an input field?

I have added some input to an input field element this way: const inputFiled = document.querySelector("#example"); inputField.value = "X"; I want to fire a change event for that field right af...

2 answers  ·  posted 2y ago by deleted user  ·  edited 2y ago by Alexei‭

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+0 −3
Why would a form value inserted with value property won't be effective? [closed]

In a website I didn't build, I want to put a value in an HTML input field element with JavaScript and to also use it as-putted. I can put it with the browser console this way: document.querySelec...

1 answer  ·  posted 2y ago by deleted user  ·  closed 2y ago by Alexei‭

71%
+3 −0
document.open() and the DOM tree of the loaded (closed) browser window on which it works

If I execute in browser console: document.write("Hello"); A new DOM document with the text Hello appears in the same browser window. From MDN documentation: Note: Because document.write() w...

1 answer  ·  posted 2y ago by deleted user  ·  edited 2y ago by Alexei‭

25%
+0 −4
What is the difference between a decoupled, Headless and RESTful content management system?

By means of content management system architecture, Is the implementation of decoupling architecture (backend and frontend separation), headless architecture and Representational State Transfer (R...

1 answer  ·  posted 2y ago by deleted user  ·  last activity 2y ago by Canina‭

71%
+3 −0
Docutils rst2pseudoxml.py reported error: No role entry for "meth"

docutils's rst2pseudoxml.py is reporting this error: Unknown interpreted text role "meth". even though the build command: sphinx-build -b html -d build/doctrees source build/html runs fine and pro...

1 answer  ·  posted 2y ago by CodeFarmer‭  ·  last activity 2y ago by J-hen‭

66%
+2 −0
Understanding createTreeWalker method in the context of replacing strings (or parts of them)

I want to ensure I understand the following code; credit to user:m3g4p0p on Sitepoint, for this code: const walker = document.createTreeWalker( document.body, NodeFilter.SHOW_TEXT ) let...

1 answer  ·  posted 2y ago by deleted user  ·  last activity 2y ago by hkotsubo‭

62%
+3 −1
Python looping 300 000 rows

Based on my last question comes new one. How to loop over 300 000 rows and edit each row string one by one? I have a list of 11-digit numbers stored in one single column in Excel, and I need to s...

1 answer  ·  posted 2y ago by sfrow‭  ·  last activity 2y ago by NoahTheDuke‭

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+2 −0
How do I remove the column options menu from an embedded Look?

I have a Looker table look displayed to users using SSO embedding in an iframe. When displayed to users, the users can access the column options menu via a cog-wheel dropdown. In Admin > Platfo...

0 answers  ·  posted 2y ago by Sigma‭

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+4 −0
Add single element for multiple keys to map

I have a map and a new item to add to the map and a list of keys I want to attach the new item to: => m1 {:a 1 :b 2} => itm 3 => ks [:c :d :e] => m2 {:a 1 :b 2 :c 3 :d 3 :e 3} ...

2 answers  ·  posted 2y ago by NoahTheDuke‭  ·  edited 2y ago by Alexei‭

66%
+4 −1
Dye all label asterisks Red with vanilla JavaScript

I want to dye all label asterisks Red with vanilla JavaScript. CSS isn't good for this because it would dye both asterisks and colons (:) instead just the asterisks: .labelWithColonAndAsterisk:af...

2 answers  ·  posted 3y ago by deleted user  ·  edited 2y ago by deleted user

57%
+2 −1
Change font-family with JavaScript

I want to change the font-family of all elements in a document with JavaScript. I have tried this: document.querySelectorAll("body").forEach( (e)=>{ e.style.fontFamily = "arial"; }); ...

2 answers  ·  posted 2y ago by deleted user  ·  edited 2y ago by deleted user

77%
+5 −0
Common string handling pitfalls in C programming

Preface: This is a self-answered Q&A meant as a C string handling FAQ. It will ask several question at once which isn't ideal, but they are all closely related and I'd rather not fragment the p...

1 answer  ·  posted 2y ago by Lundin‭  ·  last activity 2y ago by Lundin‭

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+1 −1
How to grant privileges to a user on a database specifically (i.e. not globally) in PHPMyAdmin?

In PHPMyAdmin 5.1.1 I have created a user account and a database with the same name and granted all privileges to the user on that database. I have exported the database to a backup file, deleted ...

1 answer  ·  posted 2y ago by deleted user  ·  last activity 2y ago by deleted user

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+2 −1
Fixing vertical discrepancies with CSS

I have a "Our menu" webpage automatically created with Drupal 9 Views module which presents a miniature version of each menu dish webpage in that "Our menu" webpage (illustration image below). My ...

1 answer  ·  posted 2y ago by deleted user  ·  edited 2y ago by deleted user

60%
+4 −2
Separate digits of a number in groups with different sizes

I have a list of 11-digit numbers stored in one single column in Excel, and I need to separate the digits according to this pattern: 2-2-1-3-3. Example: 00002451018 becomes 00 00 2 451 018. How c...

2 answers  ·  posted 2y ago by sfrow‭  ·  edited 2y ago by Alexei‭

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+0 −0
How to to make a store tree view cart

I am building an MVC cart system. I have the MERCHANTS table and the PRODUCTS table. A merchant (store) can have one or more products, everything works fine but what I want is to display products b...

0 answers  ·  posted 2y ago by Fyoni‭  ·  edited 2y ago by Alexei‭

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+3 −3
How to run a remote JavaScript file from GitHub?

I have a JavaScript file in GitHub which I typically run by copy-pasting all its data into different user script managers (USMs) on different web browsers. I need to start executing that remote fi...

2 answers  ·  posted 3y ago by deleted user  ·  last activity 2y ago by chovy‭

87%
+12 −0
How do I support tab completion in a python CLI program?

I spend a lot of time writing CLI tools in Python, and I would like to support tab-completion in a style similar to Git. For example, subcommands should be tab-completable, options should expand ba...

1 answer  ·  posted 2y ago by ajv‭  ·  last activity 2y ago by hkotsubo‭

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+1 −1
What solutions available for a CMS-agnostic contact form?

By principle, I normally work with two different companies for establishing websites for myself: One for domain registration and domain-sole email address One for web application hosting My ...

2 answers  ·  posted 3y ago by deleted user  ·  last activity 2y ago by Alexei‭

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+2 −2
How to show XML in browser?

Is there possible way to run XML like as HTML? Suppose, I have following code. <?xml version="1.0" encoding="UTF-8"?> <breakfast_menu> <food> <name>Belgian Waffles&l...

2 answers  ·  posted 3y ago by Anonymous‭  ·  last activity 2y ago by desbest‭

90%
+17 −0
What is the purpose of `if __name__ == '__main__'`?

I often see the construct if __name__ == '__main__' in Python code. For example, the queens.py demo in the Python repository ends with these two lines: if __name__ == "__main__": main() Ho...

1 answer  ·  posted 2y ago by J-hen‭  ·  last activity 2y ago by hkotsubo‭

84%
+9 −0
Is it dangerous to use json.loads on untrusted data?

I manage a wsgi application that accepts JSON data via POST from potentially untrusted sources. Normally it is treated as a text blob and never parsed, but there is a value in the expected input th...

1 answer  ·  posted 2y ago by ajv‭  ·  last activity 2y ago by hkotsubo‭

75%
+4 −0
What are the disadvantages of using SQL Server Replication - Transactional Replication type?

The context A reports related process is directly reading the production operational database once about two hours. This involves reading all the data from some 70 tables which takes a couple minu...

0 answers  ·  posted 2y ago by Alexei‭

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+5 −4
What's the difference between Inheritance and Polymorphism?

I'm using Java code as an example, but this can be answered if you don't know Java. class Bird{ public void sing(){ System.out.println("Testing"); } } class anClass ex...

2 answers  ·  posted 3y ago by deleted user  ·  edited 2y ago by Alexei‭

71%
+3 −0
Is there any justification for having a single tempdb database to be used by all databases on a SQL Server intstances?

Despite the fact that I have programmed against SQL Server for quite a while I did not pay much attention to the tempdb database. This is especially true if application logic is mostly written usin...

1 answer  ·  posted 2y ago by Alexei‭  ·  last activity 2y ago by Derek Elkins‭

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+6 −0
Are there any downsides related to using Maybe or Optional monads instead of nulls?

I have recently stumbled across the Maybe (or Optional) modal usage in .NET Code: example code or this one example article Based on everything I read, there are multiple advantages on relyi...

2 answers  ·  posted 2y ago by Alexei‭  ·  last activity 2y ago by Derek Elkins‭

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+18 −0
What must a C compiler do when it finds an error?

What exactly must a C compiler do when it finds a compile-time error? The most obvious kind of errors are language syntax errors, but the C standard also speaks of constraints, which are rules tha...

1 answer  ·  posted 4y ago by Lundin‭  ·  edited 2y ago by ghost-in-the-zsh‭

80%
+6 −0
How kill a child process without read() hanging in the parent process?

There is an external program I'm calling from within my C/C++ program, by using fork() and execl(), and redirecting the stdio with dup2() to be able to read the output from the external program. I...

1 answer  ·  posted 2y ago by sktpin‭  ·  edited 2y ago by Lundin‭

71%
+3 −0
Retrieve user details from service in Angular

Angular 12; .NET Core 3.1 Following a code-maze tutorial, I have a working authentication (registration/login) service using .NET Core Identity. After login, I would like to add 'username' data ...

1 answer  ·  posted 2y ago by mcalex‭  ·  last activity 2y ago by meriton‭

60%
+1 −0
How does PathData work?

What is pathData? I was thinking to convert SVG to XML. I found it. In the code, I had seen that android:pathData="M 64 2 C 98.2416544895 2 126 29.7583455105 126 64 C 126 98.2416544895 98.2416544...

2 answers  ·  posted 2y ago by Anonymous‭  ·  edited 2y ago by Alexei‭

57%
+2 −1
Hash sum mismatch (only for openjdk-11-jdk)

I was installing Java yesterday. I had faced lot of problem. I had fixed most of them. But I had changed Hash that's what I think. I don't remember which command I had executed since I had executed...

1 answer  ·  posted 2y ago by Anonymous‭  ·  edited 2y ago by Alexei‭

42%
+1 −2
&lrm; character jumbles text and this can be confusing when working with many articles

I often work bidirectional text in content management systems and often that text has parenthesis (()) or other textual wrappers flipping after an English text which is preceded in itself by some R...

0 answers  ·  posted 2y ago by deleted user

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+1 −2
Objection CLI - SVM Conception - Freezing prompt

Now I build a Python script to execute automaticaly a dynamic analysis on apk and I block because I use this library and call objection. When I run my script, the objection command creates an inst...

0 answers  ·  posted 2y ago by Link213‭  ·  edited 2y ago by Alexei‭

36%
+2 −5
What problem does innerHTML solves?

I understand that innerHTML does all the following actions: It makes the element we work on (or even the entire DOM tree that we work on if that element is <body>) to be copy-pasted into a...

1 answer  ·  posted 2y ago by deleted user  ·  edited 2y ago by deleted user

62%
+3 −1
Are there practical reasons for designing a method-only class/object?

Are there practical reasons for designing/implementing a method(s)-only class/object? Follow-up background notes: This question is for languages that are not exclusively Object-Oriented, for exam...

3 answers  ·  posted 3y ago by CodeFarmer‭  ·  last activity 2y ago by hkotsubo‭

22%
+0 −5
Why I am unable to find a class after implementing library also?

I had found a better way to plot in Java. int n = Integer.parseInt(args[0]); // the function y = sin(4x) + sin(20x), sampled at n+1 points // between x = 0 and x = pi ...

0 answers  ·  posted 2y ago by Anonymous‭  ·  edited 2y ago by Anonymous‭

28%
+0 −3
How to plot in C++?

I was trying to plot using following lines in C++. #include "koolplot.h" int main() { plotdata x(-6.0, 6.0); plotdata y = sin(x) + x/5; plot(x, y); return 0; } When I was...

0 answers  ·  posted 2y ago by Anonymous‭

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+0 −0
Why some items aren't clickable in RecyclerView?

if (type=="dialer") { String timestamp = list.get(position).get(Constants.DATE); holder.txtTimestamp.setVisibility(View.VISIBLE); holder.imgDelete.s...

0 answers  ·  posted 2y ago by Anonymous‭

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+2 −5
What is the main difference between event delegation to other event handling patterns in JavaScript?

I define a software event as any state of a program to which we can probably respond. In JavaScript, how does event delegation differs from more simple and probably more common event handling patt...

1 answer  ·  posted 2y ago by deleted user  ·  edited 2y ago by Alexei‭

22%
+0 −5
Why margin isn't working in SVG for path?

<?xml version="1.0" encoding="iso-8859-1"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> <svg version="1.1" id="Capa_1" x="0px...

0 answers  ·  posted 2y ago by Anonymous‭  ·  edited 2y ago by Alexei‭

60%
+1 −0
WARNING: environment variable DISPLAY is not set (netbeans)

I was trying to install Netbeans in Xubuntu. I had installed Netbeans using Snapd. sudo snap install netbeans --classic I was trying to start Netbeans then I got an error which was looking like...

1 answer  ·  posted 2y ago by Anonymous‭  ·  last activity 2y ago by Anonymous‭

22%
+0 −5
Adding support on mathematical expressions

MarkFuncs has really gotten huge progress, at least in my eyes, and now, I want to make math possible in the language. Background MarkFuncs is a programming language that I have been working on f...

0 answers  ·  posted 2y ago by General Sebast1an‭  ·  edited 2y ago by Lundin‭

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+12 −0
What compiler options are recommended for beginners learning C?

When reading questions about C programming from beginners, I very often see them describing peculiar run-time errors and crashes, segmentation faults and similar. They have spent a lot of time chas...

1 answer  ·  posted 3y ago by Lundin‭  ·  edited 2y ago by Lundin‭

75%
+4 −0
Get the length of a slice from a multi-dimensional array

If I have a one-dimensional array, I can get the length of it quite easily: var x = moves.Length(). However, if the array is multi-dimensional, .Length() returns the total number of elements. If ...

2 answers  ·  posted 2y ago by FrankLuke‭  ·  last activity 2y ago by FoggyFinder‭

60%
+1 −0
can't find git repo (library)

Could not find com.github.Kunzisoft:Android-SwitchDateTimePicker:1.9. Required by: project :app Search in build.gradle files I was trying to use the library. I had searched for 2.1, 2.0 a...

1 answer  ·  posted 2y ago by Anonymous‭  ·  last activity 2y ago by Anonymous‭

33%
+0 −2
Why comma is expected for auto_increment?

query = "CREATE TABLE "+TABLE+" ("+COLUMN1+" INTEGER PRIMARY KEY NOT NULL AUTO_INCREMENT, "+COLUMN2+" VARCHAR(255), " + COLUMN3+" VARCHAR(255), "+COLUMN4+" TEXT, "+ COLUMN5+" VARCHAR(255)...

1 answer  ·  posted 2y ago by Anonymous‭  ·  edited 2y ago by Alexei‭

60%
+1 −0
Why is the switch statement not executing the correct case blocks?

In the code below, the value of order variable should change according to i's value: String order; switch (i){ case 0: order = CallLog.Calls.DATE + " DESC "; contactViewAda...

1 answer  ·  posted 2y ago by Anonymous‭  ·  last activity 2y ago by hkotsubo‭

66%
+2 −0
What's the better way to store base64 in SQLite Database?

What's the better way to store base64 in SQLite Database? I was thinking to put base64 as TEXT since base64 has lots of chars. CREATE TABLE name (id INTEGER PRIMARY KEY AUTO_INCREMENT, image TEXT)...

1 answer  ·  posted 2y ago by Anonymous‭  ·  edited 2y ago by Anonymous‭

60%
+1 −0
How can I export metrics from Angular frontend to be read with Prometheus ?

How can I monitor an Angular frontend with Prometheus? I was able to create metrics for my Node.js API using the express-prometheus module. But I can't find any Angular/Prometheus integration. Basi...

0 answers  ·  posted 2y ago by nelson777‭  ·  edited 2y ago by Peter Mortensen‭

57%
+2 −1
How to append HTML to the DOM with JavaScript?

I have a .html file containing only the following data, and I keep that file on top of my website's directory. <link rel="stylesheet" href="./css/mobile_general_structure.css"></link> ...

2 answers  ·  posted 2y ago by deleted user  ·  last activity 2y ago by Ullallulloo‭