Category: JavaScript

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React Answers

How to go back a page with React Router v6?

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To go back a page with React Router v6, we use the useNavigate hook.

For instance, we write

import { useNavigate } from "react-router-dom";

function App() {
  const navigate = useNavigate();

  return (
    <>
      <button onClick={() => navigate(-1)}>go back</button>
      <button onClick={() => navigate(1)}>go forward</button>
    </>
  );
}

to call useNavigate to return the navigate function.

Then we call navigate with -1 to go back to the previous page.

We can also call navigate with 1 to go to the next page in the history.

Conclusion

To go back a page with React Router v6, we use the useNavigate hook.

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JavaScript Answers

How to get element by class name with JavaScript?

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Sometimes, we want to get element by class name with JavaScript.

In this article, we’ll look at how to get element by class name with JavaScript.

How to get element by class name with JavaScript?

To get element by class name with JavaScript, we can use the getElementsByClassName method.

For instance, we write

const els = [...document.getElementsByClassName("foo")];

to call getElementsByClassName with 'foo' to return all the elements with class foo in a node list.

Then we spread the node list entries into an array with ...

Conclusion

To get element by class name with JavaScript, we can use the getElementsByClassName method.

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JavaScript Answers

How to get all attributes from a HTML element with JavaScript?

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Sometimes, we want to get all attributes from a HTML element with JavaScript.

In this article, we’ll look at how to get all attributes from a HTML element with JavaScript.

How to get all attributes from a HTML element with JavaScript?

To get all attributes from a HTML element with JavaScript, we can use the attributes property of the element.

For instance, we write

const elem = document.querySelector("[name=test]");
const attrs = [...elem.attributes].map(
  (attr) => attr.nodeName
);

console.log(attrs);

to select the element with querySelector.

And then we get the attributes with elem.attributes.

Next, we spread the entries of attributes NodeMap into an array.

And we get the name of each attribute with nodeName.

Conclusion

To get all attributes from a HTML element with JavaScript, we can use the attributes property of the element.

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JavaScript Answers

How to fix var.replace is not a function with JavaScript?

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Sometimes, we want to fix var.replace is not a function with JavaScript.

In this article, we’ll look at how to fix var.replace is not a function with JavaScript.

How to fix var.replace is not a function with JavaScript?

To fix var.replace is not a function with JavaScript, we should make the variable we’re calling replace on is a string.

For instance, we write

const trim = (str) => {
  return str.toString().replace(/^\s+|\s+$/g, "");
};

to define the trim function that takes the str parameter.

To make sure that str is a string, we call toString to convert it to a string before we call replace on it.

Conclusion

To fix var.replace is not a function with JavaScript, we should make the variable we’re calling replace on is a string.

Categories
React Answers

How to add multiple path names for the same component in React Router v6?

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Sometimes, we want to add multiple path names for the same component in React Router.

In this article, we’ll look at how to add multiple path names for the same component in React Router.

How to add multiple path names for the same component in React Router v6?

To add multiple path names for the same component in React Router, we can set the element property to the component we want to render.

For instance, we write

import React from "react";
import { BrowserRouter as Router, useRoutes } from "react-router-dom";

const App = () =>
  useRoutes([
    { path: "/home", element: <Home /> },
    { path: "/users", element: <Home /> },
    { path: "/widgets", element: <Home /> },
  ]);

const AppWrapper = () => (
  <Router>
    <App />
  </Router>
);

to render the Home component we navigate to /home, /users, or /widgets by calling the useRoutes hook with an array of routes.

Conclusion

To add multiple path names for the same component in React Router, we can set the element property to the component we want to render.