Found 9326 Articles for Object Oriented Programming

Store it like the following −var players = {    600 : 'Sachin',    300 : 'Brad', };For key/ value pairs, we have used the above solution, since we wanted a one-to-one. We did this to use the key as a lookup key. You can also add more values like this −var players = {    900 : 'Sachin',    300 : 'Brad',    700 : 'Steve',    200 : 'Rahul',    600 : 'Kevin',    500 : 'David', }

To deal with “Object doesn’t support this property or method” issue in JavaScript, while using events and Internet Explorer, update your code with this −Example                      ...     You can also use attachEvent in IE to solve this issue like this −if (ev.addEventListener) {    ev.addEventListener('click', myText, false); } else if (ev.attachEvent) {     ev.attachEvent('onclick', myText); }

For array intersection, you can try to run the following code in JavaScript −Example                    let intersection = function(x, y) {             x = new Set(x), y = new Set(y);             return [...x].filter(k => y.has(k));          };          document.write(intersection([5,7,4,8], [3,9,8,4,3]));          

The best way to detect a ‘touch screen’ device, is to work around to see whether the touch methods are present within the document model or not.function checkTouchDevice() {    return 'ontouchstart' in document.documentElement; }Here, you can also use it to detect mobile or desktop, like the following −if (checkTouchDevice()) {    // Mobile device } else {    // Desktop }

To set height equal to the dynamic width in JavaScript, you can try to run the following code −Example                    .wrap {             width:400px;             height:300px;             border:2px solid yellow;          }          .myChild{             width: 80%;             border:1px solid red;          }                                  var res = $('.myChild').width();          $('.myChild').css({             'height': res + 'px'          });                                        

The setInterval() method is used evaluate an expression at specified intervals. This function calls function after every duration milliseconds. This goes for unlimited times. Let’s see an example −It triggers alert(‘Hello’) after every 2000 milliseconds, not only once.setInterval(function() { alert('Hello');}, 2000);To clear the usage of setInterval(), use the window.clearInterval() and set the parameter as the ID, likewindow.setInterval();

The usage of anonymous functions affect performance is the sense, you need to create a new function object at each iteration. Anonymous functions are always loaded using a variable name. Anonymous, as the name suggests, allows creating a function without any names identifier. It can be used as an argument to other functions. Call them using a variable name −ExampleThis is how JavaScript anonymous functions can be used −var func = function() {    alert(‘This is anonymous'); } func();Here’s an example −//anonymous function var a = function() {    return 5; }

Yes, iOS capture onscroll events for a scroll. This is called one-finger events. What the user is tapping or touching decides whether an event is generated or not.Here is panning gesture,Image credit − AppleIt can also be touch and hold gesture,Image credit − Apple

To set the order of the flexible item, relative to the rest of JavaScript, use the order property. You can try to run the following code to implement order property − Example Live Demo #box { border: 1px solid #000000; width: 420px; height: 150px; display: flex; } #box div { height: 80px; width: 80px; } DIV1 DIV2 DIV3 Set function display() { document.getElementById("myID1").style.order = "3"; document.getElementById("myID2").style.order = "1"; document.getElementById("myID3").style.order = "2"; }

To inject JavaScript in WebBrowser control, use the following steps − Firstly, create a Windows Forms application in Visual Studio. Now, drag a WebBrowser control to the form Set the Url property. Right-click the project, choose to Add reference... → COM → Type Libraries Select "Microsoft HTML Object Library"  Add the following code to inject JavaScript.private void myWebBrowser(object sender, WebBrowserDocumentCompletedEventArgs e){      // head element    HtmlElement hElement = weBrowser.Document.GetElementsByTagName("head")[0];    // script element    HtmlElement sElement = weBrowser.Document.CreateElement("script");    IHTMLScriptElement val = (IHTMLScriptElement)sElement.DomElement;    element.text = "function sayHello() {       alert('Weclome')    }";    hElement.AppendChild(sElement);    weBrowser.Document.InvokeScript("How you doing?"); }