Category: JavaScript Answers

Sometimes, we want to read line by line of a text area HTML tag with JavaScript.

In this article, we’ll look at how to read line by line of a text area HTML tag with JavaScript.

How to read line by line of a text area HTML tag with JavaScript?

To read line by line of a text area HTML tag with JavaScript, we can use the string split method.

For instance, we write

const textArea = document.getElementById("my-text-area");
const arrayOfLines = textArea.value.split("\n");

to select the text area with getElementById.

Then we get the value of the text area with value.

And then we call split with '\n' to split the text area value into an array of strings by the new line character.

Conclusion

To read line by line of a text area HTML tag with JavaScript, we can use the string split method.

Sometimes, we want to prevent text or element selection with cursor drag with JavaScript.

In this article, we’ll look at how to prevent text or element selection with cursor drag with JavaScript.

How to prevent text or element selection with cursor drag with JavaScript?

To prevent text or element selection with cursor drag with JavaScript, we can use the window.getSelection().removeAllRanges(); method in the selectstart event handler.

For instance, we write

document.onselectstart = () => {
  window.getSelection().removeAllRanges();
};

to set document.onselectstart to a function that calls window.getSelection().removeAllRanges(); to remove all selection in the document when we start making selections.

This will prevent anything from being selected on the page.

Conclusion

To prevent text or element selection with cursor drag with JavaScript, we can use the window.getSelection().removeAllRanges(); method in the selectstart event handler.

Sometimes, we want to count the number of lines of a string in JavaScript.

In this article, we’ll look at how to count the number of lines of a string in JavaScript.

How to count the number of lines of a string in JavaScript?

To count the number of lines of a string in JavaScript, we can use the string split method.

For instance, we write

const lines = str.split(/\r\n|\r|\n/);

to call str.split with a regex that matches all line breaks in the str string to split the string by the new line characters.

It returns an array of split substrings so we can use the length property of the lines array to get the number of lines in str.

Conclusion

To count the number of lines of a string in JavaScript, we can use the string split method.

Sometimes, we want to use import fs from ‘fs’ with JavaScript.

In this article, we’ll look at how to use import fs from ‘fs’ with JavaScript.

How to use import fs from ‘fs’ with JavaScript?

To use import fs from ‘fs’ with JavaScript, we’ve to run our Node.js app with Node.js 10 or later.

And the --experimental-modules flag has to be enabled.

Once the requirements are met, then we write

import { readFileSync } from "fs";

to import the readFileSync function from the fs ES module.

Conclusion

To use import fs from ‘fs’ with JavaScript, we’ve to run our Node.js app with Node.js 10 or later.

And the --experimental-modules flag has to be enabled.

Sometimes, we want to remove first and last slash with a JavaScript regular expression.

In this article, we’ll look at how to remove first and last slash with a JavaScript regular expression.

How to remove first and last slash with a JavaScript regular expression?

To remove first and last slash with a JavaScript regular expression, we can use the /^\/|\/$/g regex.

For instance, we write

const newString = theString.replace(/^\/|\/$/g, "");

to call theString.replace with the /^\/|\/$/g regex to replace all matches in the theString string with empty strings.

^\/ matches the starting slash.

\/$ matches the ending slash.

| combines the 2 patterns together with OR.

g makes the regex match all instances of the patterns.

Conclusion

To remove first and last slash with a JavaScript regular expression, we can use the /^\/|\/$/g regex.