Found 448 Articles for Programming Scripts

The operator is used in JavaScript to check whether a property is in an object or not.ExampleYou can try to run the following code to learn how to use in operator in JavaScript −Live Demo                    var emp = {name:"Amit", subject:"Java"};          document.write("name" in emp);          document.write("");          document.write("subject" in emp);          document.write("");          document.write("MAX_VALUE" in Number);          document.write("");          document.write("MIN" in Number);          

We will learn how to add a row to a table using JavaScript dom. To achieve this, we have multiple methods. Some of them are the following. Using the insertRow() method By creating the new Element Using the insertRow() Method The inserRow() method is used to insert a new row at the starting of the table. It creates a new element and inserts it into the table. This takes a number as a parameter that specifies the position of the table. If we do not pass any parameter then it inserts the row at the starting of ... Read More

To perform multiline matching, use the M modifier available in JavaScript Regular Expression.ExampleYou can try to run the following code to perform multiline matching −           JavaScript Regular Expression                        var myStr = "Welcoming!";          var reg = /^ing/m;          var match = myStr.match(reg);                    document.write(match);          

To match any of the specified alternatives, follow the below-given pattern −(foo|bar|baz)ExampleYou can try to run the following code to find any alternative text −           JavaScript Regular Expression                        var myStr = "one,one,one, two, three, four, four";          var reg = /(one|two|three)/g;          var match = myStr.match(reg);          document.write(match);          

In this tutorial, we will learn how to perform Case Insensitive matching with JavaScript RegExp. Regular expressions can be declared in two ways − Using regular expressions literal, which start and end with slashes, and the pattern is placed in between. Calling the RegExp object constructor, which takes the pattern and flags in the parameters to create a regular expression. Users can use the below syntax to create a regular expression. Syntax //Using a regular expression literal const regex = /tutorial/i //Using RegExp constructor const regex2 = new RegExp('tutorial', 'i') In the above syntax, the regular expressions ... Read More

In this tutorial, we learn how to find the digits between brackets using JavaScript RegExp. The ASCII values for the digits (0-9) start from 48 to 57. We denote the digits in the bracket as [0-9] in the regular expression. To find the digits in a range except for all digits, we can write the particular range. As to find the digits between 4 and 8, we could write it as [4-8] in the regular expression pattern. Now, our aim is to find digits inside the brackets in the text using RegExp in JavaScript. We could follow the below syntaxes ... Read More

To delete rows in a table in JavaScript, use the DOM deleteRow() method.ExampleYou can try to run the following code to learn how to delete rows in a table. The code deletes rows one at a time −Live Demo                 function captionFunc(x) {          document.getElementById(x).createCaption().innerHTML = "Demo Caption";       }                                           One             Two                                 Three             Four                                 Five             Six                                                                

This tutorial will teach us to show image rollover with a mouse event in JavaScript. The meaning of the image rollover is to either change the image style or the whole image when the user rollovers the mouse on the image.To build an attractive user interface, developers often add image rollover features to the website and applications. Here, we will see to apply image rollover differently.Change the style of the image on mouse rolloverIn this method, to create the image rollover, we will use the onmouseover and onmouseout event of JavaScript. When users take the mouse pointer on the image, ... Read More

To create a table caption, use the DOM createCaption() method.ExampleYou can try to run the following code to learn how to create table caption −Live Demo                    function captionFunc(x) {             document.getElementById(x).createCaption().innerHTML = "Demo Caption";          }                                           One             Two                                 Three             Four                                 Five             Six                                          

In this tutorial, we will learn to simplify the use of regular expressions in JavaScript. Some of you have heard the regular expression word for the first time. So, it is not related to JavaScript but can be used in any programming language.The simple definition of the regular expression is that it is a sequence of the characters, also called Regex or RegExp. It can be a small or complex sequence.Let’s understand the need for regular expression by the example in the below section.Why should we use regular expressions?Suppose that you are developing the application and you need to take ... Read More