Categories
React Answers

How to disable options with React Select and JavaScript?

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.

Categories
JavaScript Answers

How to prevent href=”#” link from changing the URL hash with JavaScript?

Sometimes, we want to prevent href="#" link from changing the URL hash with JavaScript.

In this article, we’ll look at how to prevent href="#" link from changing the URL hash with JavaScript.

How to prevent href="#" link from changing the URL hash with JavaScript?

To prevent href="#" link from changing the URL hash with JavaScript, we call preventDefault.

For instance, we write

<a href="/foo/bar" class="link">Foo: Bar</a>

to add a link.

Then we write

addEventListener("click", (ev) => {
  if (ev.target.classList.contains("link")) {
    ev.preventDefault();
    //...
  }
});

to add a click listener to window with addEventListener.

In the event listener, we check if the element being clicked on has class link with classList.contains.

If it’s true, then we call preventDefault to stop the default navigation behavior.

Conclusion

To prevent href="#" link from changing the URL hash with JavaScript, we call preventDefault.

Categories
JavaScript Answers

How to convert characters to HTML entities using plain JavaScript?

Sometimes, we want to convert characters to HTML entities using plain JavaScript.

In this article, we’ll look at how to convert characters to HTML entities using plain JavaScript.

How to convert characters to HTML entities using plain JavaScript?

To convert characters to HTML entities using plain JavaScript, we use the string replace and charCodeAt methods.

For instance, we write

const html = text.replace(/[\u00A0-\u00FF]/g, (c) => {
  return "&#" + c.charCodeAt(0) + ";";
});

to call text.replace with a regex that matches the characters we want to replace.

We call it with a callback that returns the HTML entity equivalent of the character string c being replaced.

Conclusion

To convert characters to HTML entities using plain JavaScript, we use the string replace and charCodeAt methods.

Categories
JavaScript Answers

How to fake click to activate an onclick method with JavaScript?

Sometimes, we want to fake click to activate an onclick method with JavaScript.

In this article, we’ll look at how to fake click to activate an onclick method with JavaScript.

How to fake click to activate an onclick method with JavaScript?

To fake click to activate an onclick method with JavaScript, we call the click method.

For instance, we write

document.getElementById("link").click();

to get the element we want to click with getElementById.

Then we call click on it to trigger the click.

Conclusion

To fake click to activate an onclick method with JavaScript, we call the click method.

Categories
JavaScript Answers

How to check if a JSON is empty in Node.js and JavaScript?

Sometimes, we want to check if a JSON is empty in Node.js and JavaScript.

In this article, we’ll look at how to check if a JSON is empty in Node.js and JavaScript.

How to check if a JSON is empty in Node.js and JavaScript?

To check if a JSON is empty in Node.js and JavaScript, we use the Object.keys method.

For instance, we write

const empty = Object.keys(myObj).length === 0;

to get an array of property keys in the myObj object with Object.keys.

Then we check if it’s empty by checking if length is 0.

Conclusion

To check if a JSON is empty in Node.js and JavaScript, we use the Object.keys method.

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