class Questions

Getting error Firebase exception in flutter code about initialisation

Getting Firebase exception in flutter code about initialisation. I have already initialised it in main function. getting error on first line of code where fire store collection initialised. import 'package:cloud_firestore/cloud_firestore.dart'; import 'package:xuriti/models/core/user_details.dart'; class UserInfoService{ CollectionReference userInfoCollection = FirebaseFirestore.instance.collection('userInfo'); UserDetails userDetails…

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Cannot call static function in class from another non-static class in PHP

April 30, 2023
Storm
2 Answers

I am now trying this out for more 12 hours and am really frustrated cause it does not work. I have two classes Book and Comment. Each Book has multiple Comments. I want to return a specific book with its…

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Typescript function return class cannot define private member – Javascript

April 28, 2023
Sam
2 Answers

I wonder why I cannot define private members for my returned class that is generated with the below function. Does anyone know why it could not be private and protected? I saw this code somewhere but in his VS code…

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Adding a class on a map items one by one, but how can I remove it? – Javascript

April 23, 2023
Gui
2 Answers

My goal is to add a class to a single item in a items map and close it with another button. The class is added when clicking on the item, but I can't close it. I tried setActive(false) on the…

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How to add .active class to menu <a> tags based on the current url? – Jquery

April 13, 2023
GorillaDev
2 Answers

I'm building a custom menu for my website. What I want to do here is add an active class to highlight the menu item when it matches the current page link. Example: if the user is on the page https://mywebsite.it/explore-docs…

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HTML CSS Hover over class –> action in other class

April 12, 2023
Koen Meessens
2 Answers

This code is reacting on the hover of line 1 (gives red 3rd line) and is also reacting on the hover of the photo (gives new photo). I want if you hover over the first line, that also the photo…

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Why do instance fields belong to the instances instead of their prototype? – Javascript

April 2, 2023
Géry Ogam
2 Answers

In the JavaScript class syntax introduced in ES6 (static properties are accessible from the class, instance properties are accessible from the instances): static fields belong to the class; static methods belong to the class; instance methods belong to the instances’…

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How to navigate to a url in class Component – Javascript

import React, { useState, useContext, createContext } from "react"; import { Link, Redirect } from "react-router-dom"; export class Login extends React.Component { constructor(props) { super(props) window.data_login_callback = this.data_login_callback this.data_login_callback = this.data_login_callback.bind(this); } state = { brand: "" } rend(props){ console.log("ddd",props)…

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Create JS classes dynamically while looping through object – Javascript

March 30, 2023
Floyd
2 Answers

I'd like to create some kind of factory to automate the process of creating JS classes. The factory should loop through an object that contains classes names and their respective parameters. The following simplified code sample hopefully demonstrates what I…

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How to pass a dynamic Class to a function with a constructor – Javascript

March 24, 2023
ChazUK
2 Answers

I've got an instance where I want to create X number of Classes that all need a constructor to assign a logging service, and then all have a method create which will handle the data object differently depending on the…

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