Sometimes, we want to use JavaScript to download data from a URL to file programmatically. In his article, we’ll look at how to use JavaScript to download data from a URL to file programmatically. Create an Invisible Link and Click it We can create an invisible link and click it with JavaScript to download a file. To…

Sometimes, we want to make an anchor link go some pixels above where it’s linked to. In this article, we’ll look at how to make an anchor link go some pixels above where it’s linked to. Use the window.scrollTo Method We can use the window.scrollTo method to scroll to the coordinates we want on…

Sometimes, we want to watch when an element appears on the screen. In this article, we’ll look at when an element becomes visible on the screen with JavaScript. Use the IntersectionObserver API We can use the IntersectionObserver API to watch when an element is visible or not. For instance, if we have the following…

Sometimes, we want to count the number of lines of text inside a DOM element with JavaScript. In this article, we’ll look at how to count the number of lines of text inside a DOM element with JavaScript. Divide the Element’s Height by its Line Height To get the number of lines in an element, we can divide…

Sometimes, we get the ‘Cannot read property style of undefined’ when we try to add a table with jQuery DataTables. In this article, we’ll look at ‘Cannot read property style of undefined’ when we try to add a table with jQuery DataTables. th Element Mismatch One cause of this error is that the…

Sometimes, we want to jump to an anchor element by using JavaScript. In this article, we’ll look at how to jump to an anchor element by using JavaScript. Use location.href and history.replaceState We can use the location.href property to get the URL without the hash. Then we can append the hash to it. And…

Sometimes, we want to check if a value is within a range of numbers in JavaScript. In this article, we’ll look at how to check if a value is within a range of numbers in JavaScript. Use the Greater Than or Equal to and Less Than or Equal to Operators We can use the JavaScript’s greater than or equal to and less than or…

Sometimes, we want to capitalize the first letter of each word in a string using JavaScript. In this article, we’ll look at how to capitalize the first letter of each word in a string with JavaScript. Use the String.prototype.toUpperCase and String.prototype.substring Methods We can use the string toUpperCase and substring methods to convert each word in…

A tutorial on defining a JavaScript array with elements conditionally added to it. — Sometimes, we want to add array elements into a JavaScript array conditionally. In this article, we’ll look at how to define a JavaScript array with elements conditionally added to it. Use the Spread Operator We can use the spread operator to conditionally spread arrays into another array. For instance, we can write: