The +function() {} notation is primarily used to force the parser to treat whatever follows the + as an expression. This is used for functions that are invoked immediately, for example,+function() { alert("Demo!"); }();However, + before a function is one of the symbol. You can add other options also like !, -, ~, also. Parentheses can also be used as shown below:(function() { alert("Demo!"); })();You can also use it like this:(function() { alert("Demo!"); }());

To add a new line in JavaScript alert box, use the “”:alert("Line One Line Two");ExampleYou can try to run the following code add a new line in an alert box in JavaScript:Live Demo                                         Click the following button to see the result:                          

The onmouseout triggers when you move your mouse out from that element.ExampleYou can try to run the following example to learn how to call a JavaScript function from onmouseout eventLive Demo                                         Bring your mouse inside the division to see the result:                 This is inside the division          

The onmouseover event triggers when you bring your mouse over any element.ExampleYou can try to run the following example to learn how to call a JavaScript function from onmouseover eventLive Demo                                         Bring your mouse inside the division to see the result:                 This is inside the division          

The onsubmit event occurs when you try to submit a form. You can put your form validation against this event type. The following example shows how to use onsubmit. Here, we are calling a validate() function before submitting a form data to the webserver. If validate() function returns true, the form will be submitted, otherwise it will not submit the data.     The HTML    .......    

JavaScript has several built-in methods to create dialog boxes that allow users to interact with them. The prompt() method in JavaScript is one of them. The prompt dialog box is very useful when you want to pop up a text box to get user input. In this article, we'll explore how to use the prompt() method with examples. What is a Prompt Dialog Box? The prompt() method in JavaScript is used to display a dialog box that prompts the user for input. The prompt dialog box is very useful when you want to pop up a text box to ... Read More

In this tutorial, we will learn to get a timestamp in JavaScript. It never happens that software developers or application developers don’t require to play with date and time. In many situations, they are required to play with date and timestamp. For example, to show the time on the user’s dashboard, save the time of an operation in the database.Now, let’s understand what the timestamp is? The timestamp is the total number of milliseconds from the 1st January 1970 from when UNIX epochs begin. Using the timestamp, we can extract the date, day, year, month, hours, minutes, second, milliseconds, etc.So, ... Read More

In this tutorial, we will learn how to use JavaScript to show a confirm message. We use window.confirm() method of JavaScript to show a confirm message. A confirm message is enclosed in a confirm dialog box which is a modal window. Such a window takes focus upon being created and doesn’t go out of focus until the user responds to it. Confirmation dialog box in JavaScript A confirm message is a yes/no message for the user that requires immediate attention. A confirmation dialog box usually gets triggered in response to some action requested by the user. This action can be ... Read More

The onClick event is the most frequently used event type, which occurs when a user clicks the left button of the mouse. You can put your validation, warning etc., against this event type.ExampleYou can try to run the following code to call a JavaScript function from an onClick eventLive Demo                                         Click the following button and see result                          

The lifetime of a JavaScript variable begins when it is declared −var rank;A local variable will be visible only within a function where it is defined. Function parameters are always local to that function.The completion of a function deletes the local variable.A global variable has a global scope which means it can be defined anywhere in your JavaScript code. Global variables delete when the web browser is closed. However if a new page is loaded in the same browser window, then it remains.Here’s the usage of global variables −ExampleYou can try to run the following code to learn how to ... Read More