HTML Articles - Page 135 of 151

In this tutorial, we will understand two approaches to display the document's title using JavaScript. Using document.title Property One of the most used methods in JavaScript to access an HTML document’s title is using a document.title property. In the following example, you will learn to get access to the title. After accessing the title in JavaScript, you can manipulate it and change the way it is displayed on a website. Syntax Here you can see how with the use onClick method, we can set the innerHTML of a paragraph within the document. The document.title is used to grab the title, ... Read More

To match any single character outside the given set with JavaScript RegExp, use the [^aeiou] metacharacter.Example           JavaScript Regular Expression                        var myStr = "Welcome!";          var reg = /[^lc]/g;          var match = myStr.match(reg);                   document.write(match);          

In this tutorial, we will convert Boolean to Number in JavaScript. The Boolean is the variable's data type, which is supported by JavaScript like the other programming languages. The Boolean data type contains only two values, true and false. In some cases, programmers must convert the true or false value to the number. For example, using the strict equality operator to compare the Boolean value with the number variable. Here, using different operators, we have three methods to convert the Boolean to a number. Using the Number() Function In JavaScript, the Number() function is useful to convert any variable to ... Read More

To match any string containing a sequence of two to three p’s with JavaScript RegExp, use the p{2,3} Quantifier.Example           JavaScript Regular Expression                        var myStr = "Welcome 1, 10, 100, 1000, 1000";          var reg = /\d{2,3}/g;          var match = myStr.match(reg);                    document.write(match);          

To add properties and methods to an object in JavaScript, use the prototype property.ExampleYou can try to run the following code to learn how to work with prototype −           JavaScript prototype property                function book(title, author) {             this.title = title;             this.author = author;          }                              var myBook = new book("Amit", "Java");          book.prototype.price = null;          myBook.price = 500;          document.write("Book title is : " + myBook.title + "");          document.write("Book author is : " + myBook.author + "");          document.write("Book price is : " + myBook.price + "");          

Use the reduce() method in JavaScript to apply a function simultaneously against two values of the array from left-to-right as to reduce it to a single value.The following are the parameters −callback − Function to execute on each value in the array.initialValue − Object to use as the first argument to the first call of the callback.ExampleYou can try to run the following code to learn how to work with reduce() method in JavaScript −           JavaScript Array reduce Method                        if (!Array.prototype.reduce) {     ... Read More

To return a string representing the source for an equivalent Date object, use the JavaScript toSource() method. This method returns a string representing the source code of the object.ExampleYou can try to run the following code to return a string representing the source for an equivalent Date object −           JavaScript toSource() Method                        var dt = new Date(2018, 0, 15, 14, 39, 7);          document.write( "Formated Date : " + dt.toSource() );          

To return the "time" portion of the Date as a string, using the current locale's conventions, use the toLocaleTimeString() method.The toLocaleTimeString method relies on the underlying operating system in formatting dates. It converts the date to a string using the formatting convention of the operating system where the script is running. For example, in the United States, the month appears before the date (04/15/98), whereas in Germany, the date appears before the month (15.04.98).ExampleYou can try to run the following code to return the “time” portion of the Date as a string −           JavaScript toLocaleTimeString ... Read More

Use the screen.availHeight property to return the width of the user’s screen. The result will be in pixels and Taskbar feature won’t be included.ExampleYou can try to run the following code to learn how to work with the screen.availHeight property in JavaScript −Live Demo                    document.write("Height of the screen: "+screen.availHeight);          

To find a hexadecimal number character with JavaScript Regular Expression, use the following. Add the hexadecimal number here −\xddExampleYou can try to run the following code to find hexadecimal number character. It searches for hexadecimal number 53 i.e. S −           JavaScript Regular Expression                        var myStr = "Secure and Responsive!";          var reg = /\x53/g;          var match = myStr.match(reg);                    document.write(match);