The void operator is used to evaluate the given expression. After that, it returns undefined. It obtains the undefined primitive value, using void(0) i.e. 0 as an argument.The void(0) can be used with hyperlinks to obtain the undefined primitive value, ExampleLive Demo           Understanding JavaScript ... Read More

To customize the position of an alert box, use the CSS “top” and “left” properties. We have a custom alert box, which we’ve created using jQuery and styled with CSS.ExampleYou can try to run the following code to customize the position of an alert box −Live Demo     ... Read More

With JavaScript, to set more than one cookie, set document.cookie more than once using the; separator.ExampleYou can try to run the following code to set multiple cookies −Live Demo                 var num=1;       function addCookie() {       ... Read More

The following global error handler will show how to catch unhandled exception −Example                    window.onerror = function(errMsg, url, line, column, error) {             var result = !column ? '' : 'column: ' + column;             result += !error;             document.write("Error= " + errMsg + "url= " + url + "line= " + line + result);             var suppressErrorAlert = true;             return suppressErrorAlert;          };          setTimeout(function() {             eval("{");          }, 500)          

If a constructor method is not added, then a default constructor should be used. A default constructor is created when nothing is defined.SyntaxHere’s the syntax −constructor() {}The syntax for derived class −constructor(...args) {    super(...args); }

The date picker in HTML5 basically works very similar to how the JavaScript Libraries did, when we focus on the field a calendar will pop out, and then we can navigate through the months and years to select the date.Therefore, if you want the date input to use more spacing ... Read More

You can access a dictionary value to a variable in Python using the access operator []. examplemy_dict = {    'foo': 42, 'bar': 12.5 } new_var = my_dict['foo'] print(new_var)OutputThis will give the output −42You can also access the value using the get method on the dictionary. examplemy_dict = {    'foo': 42, ... Read More

Use the following to check if audio is playing −functionisPlaying(audelem) {    return!audelem.paused; }The above code can be used to check ifaudio is playing or not. The audio tag has a paused property.The paused property returns whether the audio/video is paused.You can also toggle −functiontogglePause() {    if(newAudio.paused && newAudio.currentTime > 0 ... Read More

Use the HTML onafterprint attribute to execute a script after the document is printed or it is printing.ExampleYou can try to run the following code to implement onafterprint attribute −                    function display() {             alert("Success!");          }          

Use the start attribute to set the start value of an ordered list in HTML i.e.Add the value of where you want to start above.ExampleYou can try to run the following code to implement the start attribute −           HTML ol Tag           ... Read More