Category: JavaScript

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React Answers

How to create a countdown timer in React?

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To create a countdown timer in React, we use the react-countdown package.

To install it, we run

npm i react-countdown

Then we write

import React from "react";
import ReactDOM from "react-dom";
import Countdown from "react-countdown";

const Completionist = () => <span>You are good to go!</span>;

ReactDOM.render(
  <Countdown date={new Date("2022-09-26T10:05:29.896Z").getTime()}>
    <Completionist />
  </Countdown>,
  document.getElementById("root")
);

to add the Countdown component to start the count down from the date prop value.

We render Completionist if the count down timer is finished.

Categories
JavaScript Answers

How to listen all interfaces instead of localhost only with Express app server in JavaScript?

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Sometimes, we want to listen all interfaces instead of localhost only with Express app server in JavaScript.

In this article, we’ll look at how to listen all interfaces instead of localhost only with Express app server in JavaScript.

How to listen all interfaces instead of localhost only with Express app server in JavaScript?

To listen all interfaces instead of localhost only with Express app server in JavaScript, we call listen without the 2nd argument.

For instance, we write

app.listen(3000);

to listen to all interfaces on port 3000.

Conclusion

To listen all interfaces instead of localhost only with Express app server in JavaScript, we call listen without the 2nd argument.

Categories
React Answers

How to create custom functions in a React component?

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Sometimes, we want to create custom functions in a React component.

In this article, we’ll look at how to create custom functions in a React component.

How to create custom functions in a React component?

To create custom functions in a React component, we just add them into the component class.

For instance, we write

export default class Archive extends React.Component {
  saySomething(something) {
    console.log(something);
  }

  handleClick(e) {
    this.saySomething("element clicked");
  }

  componentDidMount() {
    this.saySomething("component did mount");
  }

  render() {
    return <button onClick={this.handleClick.bind(this)} value="Click me" />;
  }
}

to add the saySomething and handleClick methods into the Archive component.

Conclusion

To create custom functions in a React component, we just add them into the component class.

Categories
JavaScript Answers

How to truncate or round whole number in JavaScript?

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Sometimes, we want to truncate or round whole number in JavaScript.

In this article, we’ll look at how to truncate or round whole number in JavaScript.

How to truncate or round whole number in JavaScript?

To truncate or round whole number in JavaScript, we can use the Math.trunc method.

For instance, we write

const num = -2147483649.536;
const result = Math.trunc(num);

to call Math.trunc with num to return a number with the decimal part removed.

Conclusion

To truncate or round whole number in JavaScript, we can use the Math.trunc method.

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JavaScript Answers

How to set a value in CKEditor with JavaScript?

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To set a value in CKEditor with JavaScript, we use the setData method.

For instance, we write

CKEDITOR.instances["fieldName"].setData("your data");

to get the CKEditor instance with CKEDITOR.instances["fieldName"].

Then we call setData with "your data" to set the field’s value to "your data".

Conclusion

To set a value in CKEditor with JavaScript, we use the setData method.