Code: var event = new MouseEvent('click', { 'view': window, 'bubbles': true, 'cancelable': false }); var node = document.getElementById('nodeMyComponentsEventIsConnectedTo'); node.dispatchEvent(event);

Solution const arr = Array(5).fill(""); console.log(arr); //prints out ["","","","",""] console.log(arr[0]); //prints out "" 1) To create new array which, you cannot iterate over, you can use array constructor: Array(100) or new…

1. Using the once option We can pass an object as an argument to the addEventListener method and specify that the event is only handled once. This is achieved by passing the property once to the object. If we set once to true, the event will only be fired once. let btn = document.getElementById('btn'); btn.addEventListener("click", function()…

Here are 2 ways to place a div side by side. Using CSS float property: <div style="width: 100%; overflow: hidden;"> <div style="width: 600px; float: left;"> Left…

To prettify a JSON object on the browser, use the <pre> tag. var data = { "data": { "x": "1", "y": "1", "url": "http://url.com" }, "event": "start", "show": 1, "id": 50 } document.getElementById("json").textContent = JSON.stringify(data, undefined, 2); <pre id="json"></pre> pre tells the…

What to do when you have this output on the terminal when you try to download a node package with NPM? npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules npm ERR! path /usr/local/lib/node_modules npm ERR! code EACCES npm ERR! errno -13 npm ERR! syscall access npm ERR! Error: EACCES: permission denied, access '/usr/local/lib/node_modules' npm ERR! { [Error: EACCES: permission denied, access '/usr/local/lib/node_modules'] npm ERR! stack: npm ERR! 'Error: EACCES: permission denied, access \'/usr/local/lib/node_modules\'', npm…

Method #1: Use a for loop through all input elements let elementsArray = document.querySelectorAll("input"); elementsArray.forEach(function(elem) { elem.addEventListener("input", function() { console.log("CHANGE!"); }); }); Method #2: Listen to the ‘document’ document.addEventListener('click', function(e){ if(e.target.tagName=="BUTTON"){ console.log("CHANGE!"); } }) Explanation: Event Bubbling is the important concept in javascript, so if you can add event on DOM directly, you can save some lines of code, no need for looping.

Method #1: for loop let array1 = ['a','b','c'] let array2 = ['c','c','d','e']; let array3 = []; for(let i=0;i<array1.length;i++){ if(array3.indexOf(array1[i]) == -1) array3.push(array1[i]) } for(let i=0;i<array2.length;i++){ if(array3.indexOf(array2[i]) == -1) array3.push(array2[i]) } return array3; Overall time complexity: Big O(n²) Method #2: using concat and filter (ES5 solution) let array1 = ['a','b','c']

for loop for loops are much more efficient. It is a looping construct specifically designed to iterate while a condition is true, at the same time offering a stepping mechanism (generally to increase the iterator). Example: for (var i=0, n=arr.length; i < n; ++i ) { ... } This isn’t to suggest…