Category: JavaScript Answers

Sometimes, we want to remove style on an element with JavaScript.

In this article, we’ll look at how to remove style on an element with JavaScript.

How to remove style on an element with JavaScript?

To remove style on an element with JavaScript, we can set the styles to null.

For instance, we write

const element = document.getElementById("sample_id");

element.style.width = null;
element.style.height = null;

to select the element with getElementById.

Then we set the width and height styles to null to remove the width and height styles of the element.

Conclusion

To remove style on an element with JavaScript, we can set the styles to null.

Sometimes, we want to fix dotenv file is not loading environment variables with JavaScript.

In this article, we’ll look at how to fix dotenv file is not loading environment variables with JavaScript.

How to fix dotenv file is not loading environment variables with JavaScript?

To fix dotenv file is not loading environment variables with JavaScript, we can call config to set the path to the .env file.

For instance, we write

const path = require("path");
require("dotenv").config({ path: path.resolve(__dirname, "../.env") });

to call config with an object with the path property that has the full path to the .env file that we want to load.

We call path.resolve with __dirname, which has the path of the project directory and the relative path to the .env file appended to it.

Conclusion

To fix dotenv file is not loading environment variables with JavaScript, we can call config to set the path to the .env file.

Sometimes, we want to obtain smallest value from array in JavaScript.

In this article, we’ll look at how to obtain smallest value from array in JavaScript.

How to obtain smallest value from array in JavaScript?

To obtain smallest value from array in JavaScript, we can use the Math.min method.

For instance, we write

const arr = [14, 58, 20, 77, 55, 34, 25, 8];
const min = Math.min(...arr);
console.log(min);

to call Math.min with the arr array entries spread as arguments of Math.min to get the smallest number in arr.

Conclusion

To obtain smallest value from array in JavaScript, we can use the Math.min method.

Sometimes, we want to close window automatically after printing dialog closes with JavaScript.

In this article, we’ll look at how to close window automatically after printing dialog closes with JavaScript.

How to close window automatically after printing dialog closes with JavaScript?

To close window automatically after printing dialog closes with JavaScript, we call window.close when we move focus back onto the main window after printing.

For instance, we write

setTimeout(() => {
  window.print();
}, 500);

window.onfocus = () => {
  setTimeout(() => {
    window.close();
  }, 500);
};

to call window.print to open the browser print dialog.

Then we set window.onfocus to a function that runs when the window gets focus.

In it, we call window.close to close the window after a 500 ms delay in the setTimeout callback.

Conclusion

To close window automatically after printing dialog closes with JavaScript, we call window.close when we move focus back onto the main window after printing.

Sometimes, we want to run a single test file from command line with Karma and JavaScript.

In this article, we’ll look at how to run a single test file from command line with Karma and JavaScript.

How to run a single test file from command line with Karma and JavaScript?

To run a single test file from command line with Karma and JavaScript, we can run a few commands.

First, we run

karma start

to start the Karma test server.

Then we run

karma run -- --grep=testDescriptionFilter

to run the test with the testDescriptionFilter text in the string that we call describe with to run those tests.

Conclusion

To run a single test file from command line with Karma and JavaScript, we can run a few commands.