I have array of object Expected result: I use reduce() method to group the objects in an array by ‘group’ and calulate sum: How to group object of Array by key ‘group’ and calulate average?. I tried: But Expected result: Answer You could simply use reduce to get the total of age groups…
Tag: javascript
Can’t access Adonis from Docker Container
I use Docker to contain my Adonis app. The build was success but when I access the app, I got ERR_SOCKET_NOT_CONNECTED or ERR_CONNECTION_RESET. My docker compose contains adonis and database. Previously, I use the setup similar with this for my expressjs app, and it has no problem. The adonis .env is remain s…
How to automatically add a sandbox attribute to iframe using JS
I have multiple video players on my site, but they open popup ads, so to block them I use the sandbox attribute, but not all of the players have the sandbox attribute. So I need javascript to automatically add the sandbox=”allow-modals allow-orientation-lock allow-pointer-lock allow-presentation allow-s…
Node.js response API vs. Express.js response API
Both, Node.js and Express.js have response API. And it looks like there is even some overlapping between them, e.g.: Node.js: response.write(chunk[, encoding][, callback]) Express.js: res.attachment([filename]) res.download(path [, filename] [, options] [, fn]) res.sendFile(path [, options] [, fn]) res.send([…
Javascript automatically calculating
I try to add 3 input text of type readonly automatically using javascript, each value of each text input changes automatically based on the input from the related one. But when all of the inputs are filled with values, the total input text has not changed at all, even though I’ve tried to put the onchan…
JQuery .change(function) not working in DataTables 2nd page and after
I am using Jquery data-table and using select tag which is dependent on table , but Jquery script doesn’t work on second page and after. I want to filter results in table based on select tag in all pages but as soon as I choose option from select tag it only filters the rows present in the first page an…
How do I change the date format?
This is my js function to fetch data from database. The data is being dynamically appended data to my modal popup from the js page. Currently the date format shown, is “2018-06-09 15:43:44″(as stored in database). I wish to change the date format that is being displayed to dd-MMM-YYYY. Is there a …
MongoDB: How to append to a string in a deep nested array
I’m a hobbyist web programmer who just started learning MongoDB/Mongoose and I can’t seem to figure out how to append to a string located in a deep nested array. I am trying to append a string to the end of hours: String. Below is the Schema I’m working with: Here is what I have so far. I tr…
Add Event Listener not Connecting to Button
I am trying to click a button, that will then change the display of overlay on my page to none. In the console it is telling me that, startButton.addEventListener is not a function. Can someone help me find the bug? Answer Get your button with getElementById, it works
Get the value of a radio input button using jQuery
I’m trying to get the value of the radio button that has been clicked, and I’m using the code below. But I’m getting the following error: jquery-3.5.1.min.js:2 Uncaught TypeError: Cannot read property ‘toLowerCase’ of undefined The code that I have used: Answer The issue is that …