How to get the current script element: 1. Use document.currentScript document.currentScript will return the <script> element whose script is currently being processed. <script> var me = document.currentScript; </script> Benefits Simple and explicit. Reliable. Don’t need to modify the script tag Works with asynchronous scripts (defer & async) Works with scripts inserted dynamically Problems Will not … Read more
Two options: for (let item in MotifIntervention) { if (isNaN(Number(item))) { console.log(item); } } Or Object.keys(MotifIntervention).filter(key => !isNaN(Number(MotifIntervention[key]))); (code in playground) Edit String enums look different than regular ones, for example: enum MyEnum { A = “a”, B = “b”, C = “c” } Compiles into: var MyEnum; (function (MyEnum) { MyEnum[“A”] = “a”; MyEnum[“B”] … Read more
// Get the focused element: var $focused = $(‘:focus’); // No jQuery: var focused = document.activeElement; // Does the element have focus: var hasFocus = $(‘foo’).is(‘:focus’); // No jQuery: elem === elem.ownerDocument.activeElement; Which one should you use? quoting the jQuery docs: As with other pseudo-class selectors (those that begin with a “:”), it is recommended … Read more
Should just be something like: // Gets the number of elements with class yourClass var numItems = $(‘.yourclass’).length As a side-note, it is often beneficial to check the length property before chaining a lot of functions calls on a jQuery object, to ensure that we actually have some work to perform. See below: var $items … Read more
It seems some people are landing here, and simply want to know if an element exists (a little bit different to the original question). That’s as simple as using any of the browser’s selecting method, and checking it for a truthy value (generally). For example, if my element had an id of “find-me”, I could … Read more
delete will delete the object property, but will not reindex the array or update its length. This makes it appears as if it is undefined: > myArray = [‘a’, ‘b’, ‘c’, ‘d’] [“a”, “b”, “c”, “d”] > delete myArray[0] true > myArray[0] undefined Note that it is not in fact set to the value undefined, … Read more