Category: React Answers

Sometimes, we want to disable options with React Select and JavaScript.

In this article, we’ll look at how to disable options with React Select and JavaScript.

How to disable options with React Select and JavaScript?

To disable options with React Select and JavaScript, we set the isDisabled property to true.

For instance, we write

import Select from "react-select";

const ReactSelect = () => {
  const options = [
    { label: "a", value: "a", isDisabled: true },
    { label: "b", value: "b" },
  ];

  return <Select name="mySelect" options={options} />;
};

to set the options prop to the options array.

In options, we set isDisabled to true to disable the first option.

Conclusion

To disable options with React Select and JavaScript, we set the isDisabled property to true.

Sometimes, we want to use onClick with divs in React.js.

in this article, we’ll look at how to use onClick with divs in React.js.

How to use onClick with divs in React.js?

To use onClick with divs in React.js, we set the onClick prop to a function reference.

For instance, we write

<div onClick={doThis}>...</div>

or

<div onClick={() => doThis()}>...</div>

to set the onClick prop to a function.

We set it to the doThis function directly in the first example.

And we set it to a function that calls doThis in the 2nd example.

Conclusion

To use onClick with divs in React.js, we set the onClick prop to a function reference.

Sometimes, we want to set the iframe content of a React component.

In this article, we’ll look at how to set the iframe content of a React component.

How to set the iframe content of a React component?

To set the iframe content of a React component, we use the createPortal function.

For instance, we write

import React, { useState } from "react";
import { createPortal } from "react-dom";

export const IFrame = ({ children, ...props }) => {
  const [contentRef, setContentRef] = useState(null);
  const mountNode = contentRef?.contentWindow?.document?.body;

  return (
    <iframe {...props} ref={setContentRef}>
      {mountNode && createPortal(children, mountNode)}
    </iframe>
  );
};

to assign the setContentRef ref to the iframe.

Then we call createPortal with children and the iframe’s body element with contentRef?.contentWindow?.document?.body to populate it.

Conclusion

To set the iframe content of a React component, we use the createPortal function.

Sometimes, we want to render multiple React components in the React render() function.

In this article, we’ll look at how to render multiple React components in the React render() function.

How to render multiple React components in the React.render() function?

To render multiple React components in the React render() function, we wrap them with a fragment.

For instance, we write

<React.Fragment>
  <h1>Page title</h1>
  <ContentComponent />
  {this.props.showFooter && <footer>(c) abc</footer>}
</React.Fragment>

to wrap our h1, ContentComponent and the footer with the React.Fragment fragment.

Then they’ll be rendered without any wrapping element.

Conclusion

To render multiple React components in the React render() function, we wrap them with a fragment.

Sometimes, we want to iterate over object with Object.entries with React.js.

In this article, we’ll look at how to iterate over object with Object.entries with React.js.

How to iterate over object with Object.entries with React.js?

To iterate over object with Object.entries with React.js, we call Object.entries and map.

For instance, we write

const a = {
  a: 1,
  b: 2,
  c: 3,
};

Object.entries(a).map(([key, value]) => {
  // ...
});

in our component to call Object.entries with a to return an array with an array of key-value pairs in object a.

Then we get the key and value from the map callback parameter and render the property key and value.

Conclusion

To iterate over object with Object.entries with React.js, we call Object.entries and map.