A tutorial on how to check if an image exists on the server with JavaScript. — Sometimes, we want to check if an image exists on the server with JavaScript. In this article, we’ll look at how to check if an image exists on the server with JavaScript. Listen to the Image error Event We can listen to the error event triggered by the image element when the image fails to load…

We can trigger a mouse click event by using the MouseEvent constructor. — Sometimes, we want to trigger a mouse click programmatically with JavaScript. In this article, we’ll look at how to simulate a mouse click with JavaScript. Use the MouseEvent Constructor We can trigger a mouse click event by using the MouseEvent constructor. For instance, we can write: document.body.addEventListener('click', () => console.log('clicked'))

A guide on how to implement dynamic getters and setters with JavaScript. — Sometimes, we want to add getters and setters dynamically to a JavaScript object. In this article, we’ll look at how to implement dynamically getters and setters with JavaScript. Use a Proxy JavaScript comes with the Proxy constructor to let us create an object that is a facade on another object. For instance, we…

A tutorial on how to trim a specific character from a string with JavaScript. — Sometimes, we want to trim a specific character from a string with JavaScript. In this article, we’ll look at how to trim a specific character from a string with JavaScript. Use the String.prototype.replace Method We can use the JavaScript string’s replace method to remove all instances of a given character. To use it, we…

Sometimes, we want to get and set the current web page scroll position with JavaScript. In this article, we’ll look at how to get and set the current web page scroll position with JavaScript. Get the Current Web Page Scroll Position We can use the document.documentElement.scrollTop or document.body.scrollTop to get the scroll position of the page. For…

A tutorial on scrolling back to the top of a scrollable div with JavaScript. — Sometimes, we want to scroll back to the top of a scrollable div with JavaScript. In this article, we’ll look at how to scroll back to the top of a scrollable div with JavaScript. Use the scroll Method We can use the scroll method of an element to scroll a scrollable div back to…

Sometimes, we want to check if a user clicked into an iframe using JavaScript. In this article, we’ll look at how to detect clicks into an iframe with JavaScript. Focus on the Main Window Then Add a blur Event Listener to the Window We can focus on the main window and then add a blur event listener to the window to see which element…

A JavaScript tutorial on checking whether a mouse button is kept down after we press it. — Sometimes, we want to check if a mouse button is still down after we press it with JavaScript. In this article, we’ll look at how to check if a mouse button is kept down after we press it with JavaScript. Listen to the mousedown and mouseup Events We can listen to the mousedown and mouseup events to…

Sometimes, we want to get the difference in months between 2 dates in our JavaScript code. In this article, we’ll look at how to get the difference between 2 dates in months with JavaScript. Get the Month Difference Between the 2 Dates We can calculate the month difference between 2 dates, then get the month difference based on…