I would like to know if there is a way to return a JS class’s value by default instead of of reference to the class object itself. Let’s say, for example, I want to wrap a string.. and now I want to get string just by using myString rather than myString.string. Is this doable somehow? Edit I took …
Author: admin@master
Using “Boolean” as the argument to .filter() in JavaScript
Recently I’ve learned that you can use the Boolean keyword to check whether a boolean value is false, e.g. this, where the arrayOfSheeps is simply an array of boolean values. As I’ve been unable to find anything about using ‘Boolean’ as a keyword, I was wondering if there are any other…
ECMAScript 6 class destructor
I know ECMAScript 6 has constructors but is there such a thing as destructors for ECMAScript 6? For example if I register some of my object’s methods as event listeners in the constructor, I want to remove them when my object is deleted. One solution is to have a convention of creating a destructor meth…
Difference between document.hidden vs document.hasFocus()
Please explain the difference between document.hidden , the HTML5 Page Visibility API and document.hasFocus(). I am doing a project which pops HTML5 Desktop Notification when the tab is not focused. I am kind of confused which one to use. Answer The hidden attribute is defined like this: On getting, the hidde…
React – getting a component from a DOM element for debugging
For the purposes of debugging in the console, is there any mechanism available in React to use a DOM element instance to get the backing React component? This question has been asked previously in the context of using it in production code. However, my focus is on development builds for the purpose of debuggi…
Show input field only if a specific option is selected
I’m trying to make a form which checks if a certain option is selected from a “select” tag. Here is my current HTML: This is the div element which should become visible after “Muu” is selected: And here is the JavaScript I’m trying to use: But it’s not working… …
How can I find the element clicked on inside a jQuery handler?
I’m trying to do a specific action on the clicked element if an argument is passed in the on click method in jQuery. When I try to access this it’s referencing the entire window instead of the clicked on element. How would I access the clicked on element in the handler? Here’s the code IR…
Use D3.min to find lowest value that is not 0
I’m trying to use D3 to find the lowest value in my dataset. However, I also have values that are 0, but I want D3 to find the lowest value that is not 0. Currently I am using: But obviously this returns 0 sometimes, when a 0 is found. Is there a way to do this? Or is the only
Time and events in soundcloud embed
How can I get the duration of a track on SoundCloud in JavaScript or PHP? Can I use this duration with JavaScript events? Answer Working JSFiddle: https://jsfiddle.net/aj3Pw/1/ HTML: JS: Relevant documentation: https://developers.soundcloud.com/docs/widget#methods
How to manually invoke Link in React-router?
I have a component that receives through props a <Link/> object from react-router. Whenever the user clicks on a ‘next’ button inside this component I want to invoke <Link/> object manually. Right now, I’m using refs to access the backing instance and manually clicking on the …