How to insert properties and functions inside ref?

How can I insert properties and functions inside a ref? Like this example: Then I want to use the propertie loading and the function onTest that way: How can I do that? Answer You cannot set ref on functional components because they don’t have an instance. You may not use the ref attribute on function components because they don’t have instances. (source: https://reactjs.org/docs/refs-and-the-dom.html#accessing-refs) To make your example working you need to convert <MyComponent /> to class component.

How to delete all files in a firebase storage directory

I have a firebase storage path that looks like this. firebase.storage().ref(‘temp/test’) the “test” folder has about 25-50 files. I know there is not a way to delete the whole directory in firebase but Is there a way to iterate through all the files in a directory and deleting them one by one? Answer Is there a way to iterate through all the files in a directory and deleting them one by one? Yes, you can use the listAll() method, as follows: Note that: This method is only available for Firebase Rules Version 2 (add rules_version = ‘2’; at the top

How do I show a selected button in a row by changing CSS in an HTML site?

I have a div of buttons in line and I want the user to be able to see when they selected a button by changing the CSS and it only going back to its old state when they select another button. Is this possible? Answer Find all the buttons and add event listener to execute some javascript where you put the logic of changing the behaviour of the buttons.

Display Javascript Object In WebPage Without Knowing Its structure

I want to Display javascript document object in webpage, in the same way it is displayed in console as object opening as dropdown. Is there any way by which we can display a javascript object on webpage without knowing its structure in the same way as console does? Answer Check this out:

How to cancel all subscriptions inside UseEffect in React

I am getting this error – Can’t perform a React state update on an unmounted component. This is a no-op, but it indicates a memory leak in your application. To fix, cancel all subscriptions and asynchronous tasks in a useEffect cleanup function. Here’s my useEffect hook, I used a ref called mounted to check if the component has unmounted or not but I am still getting the error when the component unmounts. (It takes about a minute for the error to show up). TIA Answer I usually store all my subscriptions on my component state and then call them when

The top two rows of a table not working in Html while using JS

I want to create a Tic Tac game but there is some problem probably in Javascript file thats why when any of the boxes of top row are clicked they are not responding … while the third one does Please help Answer It’s always a bit tricky to relay on the text() of a cell being “” because there might be some space left in the markup which can invalidate your condition. To quickly fix the issue you can add trim() to make sure to remove all leading and trailing space in the markup. I’ve created a JSFiddle to show

push multiple elements to array

I’m trying to push multiple elements as one array, but getting error I’m trying to do similar stuff that I’d do in ruby, I was thinking that apply is something like *. Answer When using most functions of objects with apply or call, the context parameter MUST be the object you are working on. In this case, you need a.push.apply(a, [1,2]) (or more correctly Array.prototype.push.apply(a, [1,2]))

Javascript disabling Div element on submit

The code below just hides the movie that I am playing behind. Remove element (if possible) or disable it, specially movie playing in background. I tried using document.video.disabled=true; but its not working. Any idea how to go around this problem please? Answer Try

How do you remove all the options of a select box and then add one option and select it with jQuery?

Using core jQuery, how do you remove all the options of a select box, then add one option and select it? My select box is the following. EDIT: The following code was helpful with chaining. However, (in Internet Explorer) .val(‘whatever’) did not select the option that was added. (I did use the same ‘value’ in both .append and .val.) EDIT: Trying to get it to mimic this code, I use the following code whenever the page/form is reset. This select box is populated by a set of radio buttons. .focus() was closer, but the option did not appear selected like it

Why do I get wrong, doubled input value on keyup when typing fast?

When one is typing slowly “a” & “b” the above code will result in “a”, “b” in the console log. But the problem is when somebody does it quickly. The result then is “ab”, “ab”. It’s easier to repeat this situation with letters which are near on a keyboard e.g. “e” & “r”. How to avoid it? Events keydown and keypress does not suffer from this problem of quick-typist, but they are also fire to early. Result: returned value of an input does not contain the last typed letter when they occur. Or maybe there is a way to get