Category: JavaScript Answers

Sometimes, we want to listen for cross-browser onload event when clicking the back button with JavaScript.

In this article, we’ll look at how to listen for cross-browser onload event when clicking the back button with JavaScript.

How to listen for cross-browser onload event when clicking the back button with JavaScript?

To listen for cross-browser onload event when clicking the back button with JavaScript, we can listen to the load event.

For instance, we write

window.addEventListener("load", () => {
  //...
});

to call window.addEventListener with 'load' to listen to the load event on the page.

The load event is triggered when the page loads.

Conclusion

To listen for cross-browser onload event when clicking the back button with JavaScript, we can listen to the load event.

Sometimes, we want to remove an element from a list with lodash and JavaScript.

In this article, we’ll look at how to remove an element from a list with lodash and JavaScript.

How to remove an element from a list with lodash and JavaScript?

To remove an element from a list with lodash and JavaScript, we can use the remove function.

For instance, we write

_.remove(obj.subTopics, {
  subTopicId: stToDelete,
});

to call remove with the obj.subTopics object property and an object with the property and value to remove.

We remove the item from the obj.subTopics array with subTopicId set to the value of stToDelete within in the obj object.

The removal is done in place so obj is modified with the removal.

Conclusion

To remove an element from a list with lodash and JavaScript, we can use the remove function.

Sometimes, we want to view or delete local storage in Firefox with JavaScript.

In this article, we’ll look at how to view or delete local storage in Firefox with JavaScript.

How to view or delete local storage in Firefox with JavaScript?

To view or delete local storage in Firefox with JavaScript. we can use the removeItem method to remove a single entry by the key.

And we call clear to remove all local storage entries.

For instance, we write

localStorage.removeItem("foo");
localStorage.clear();

to call removeItem to remove the entry with key 'foo'.

And we call clear to remove all local storage entries.

Conclusion

To view or delete local storage in Firefox with JavaScript. we can use the removeItem method to remove a single entry by the key.

And we call clear to remove all local storage entries.

Sometimes, we want to test for object keys and values with Jest and JavaScript.

in this article, we’ll look at how to test for object keys and values with Jest and JavaScript.

How to test for object keys and values with Jest and JavaScript?

To test for object keys and values with Jest and JavaScript, we use the toMatchObject method.

For instance. we write

const expected = { name: "foo" };
const actual = { name: "foo", type: "form" };
expect(actual).toMatchObject(expected);

to call toMatchObject to check if any part of the actual object matches the expected object.

Conclusion

To test for object keys and values with Jest and JavaScript, we use the toMatchObject method.

Sometimes, we want to pass parameters to JavaScript files.

In this article, we’ll look at how to pass parameters to JavaScript files.

How to pass parameters to JavaScript files?

To pass parameters to JavaScript files, we can store data in data attributes.

For instance, we write

<script id="helper" data-name="helper" src="helper.js"></script>

to add a script element with the data-name attribute.

Then we get the value of the data-name attribute with

const name = document.getElementById("helper").getAttribute("data-name");

We call getAttribute with 'data-name' to return the value of the data-name attribute after selecting the script element with getElementById.

Conclusion

To pass parameters to JavaScript files, we can store data in data attributes.