Category: JavaScript

Sometimes, we want to check whether a CSS3 transition of an element has started or end with JavaScript.

In this article, we’ll look at how to check whether a CSS3 transition of an element has started or end with JavaScript.

How to check whether a CSS3 transition of an element has started or end with JavaScript?

To check whether a CSS3 transition of an element has started or end with JavaScript, we listen to the transitionend event.

For instance, we write

element.addEventListener("transitionend", callback, false);

to listen to the transitionend event emitted by element with addEventListener

callback is called when the transition is finished.

Conclusion

To check whether a CSS3 transition of an element has started or end with JavaScript, we listen to the transitionend event.

Sometimes, we want to load the contents of a text file into a JavaScript variable.

In this article, we’ll look at how to load the contents of a text file into a JavaScript variable.

How to load the contents of a text file into a JavaScript variable?

To load the contents of a text file into a JavaScript variable, we call text from the response object that we get with fetch.

For instance, we write

const load = async (url) => {
  try {
    const response = await fetch(url);
    const data = await response.text();
    console.log(data);
  } catch (err) {
    console.error(err);
  }
};

load("https://example.com");

to create the load function that calls fetch to make a GET request to the url.

Then we call response.text to get the response body as a text string.

Conclusion

To load the contents of a text file into a JavaScript variable, we call text from the response object that we get with fetch.

Sometimes, we want to remove leading comma from a string with JavaScript.

In this article, we’ll look at how to remove leading comma from a string with JavaScript.

How to remove leading comma from a string with JavaScript?

To remove leading comma from a string with JavaScript, we call string substring with 1.

For instance, we write

const myOriginalString = ",'first string','more','even more'";
const myString = myOriginalString.substring(1);

to call myOriginalString.substring with 1 to return a new string that’s the same as myOriginalString except that the first character is removed.

Conclusion

To remove leading comma from a string with JavaScript, we call string substring with 1.

Sometimes, we want to make a button redirect one page to another page with JavaScript.

In this article, we’ll look at how to make a button redirect one page to another page with JavaScript.

How to make a button redirect one page to another page with JavaScript?

To make a button redirect one page to another page with JavaScript, we can set location.href to the destination URL on click.

For instance, we write

<button id="myButton">Home</button>

to add a button.

Then we write

document.getElementById("myButton").onclick = () => {
  location.href = "www.yoursite.com";
};

to select the button with getElementById.

And then we set its onclick property to a function that sets location.href to the destination URL to go to the URL when we click the button.

Conclusion

To make a button redirect one page to another page with JavaScript, we can set location.href to the destination URL on click.

Sometimes, we want to do multi-column sortBy with lodash and JavaScript.

In this article, we’ll look at how to do multi-column sortBy with lodash and JavaScript.

How to do multi-column sortBy with lodash and JavaScript?

To do multi-column sortBy with lodash and JavaScript, we can use the orderBy function.

For instance, we write

const data = _.orderBy(arr, ["type", "name"], ["asc", "desc"]);

to call orderBy with the arr array that we want to sort.

And we call it with 2 arrays that has the property we want to sort by and the direction.

Then the array with the sorted items is returned.

Conclusion

To do multi-column sortBy with lodash and JavaScript, we can use the orderBy function.