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Articles by Lokesh Yadav
38 articles
How to Find the action Attribute and method of a Form in JavaScript?
In this article we are going to learn how to find the action attribute and method of a form with suitable examples in JavaScript. In HTML, there is elements which has few attributes: input, label, text area, select, name, target. The action and method attributes of the form are used to return those values. The action attribute also specifies where to send the form data when form is submitted. To get a better idea of this concept, let’s look into JavaScript examples where we achieved the given task using action attribute and also with method attribute. Using action ...
Read MoreHow to remove existing HTML elements in JavaScript?
This article discusses about how to delete an existing element in JavaScript. To remove the existing HTML elements, we first need to select the element to be deleted from the document. Then, use the methods like remove() and removeChild() in JavaScript to delete the elements from the document. We’ll discuss about both methods in this article. Using the remove() methodThe remove() method of JavaScript will remove the element from the document. The syntax for the remove method is shown below. Obj.remove(); Using removeChild() methodThe removeChild() method of JavaScript will remove the element from the document. The syntax for the ...
Read MoreHow to add a new element to HTML DOM in JavaScript?
In this article we are going to discuss how to add a new element to HTML DOM in JavaScript. The Document object provides a method createElement() to create an element and appendChild() method to add it to the HTML DOM. Following are the steps involved in creating HTML DOM − Step 1 − To insert an element into HTML DOM, firstly, we need to create an element and append to HTML DOM. The document.createElement() is used to create the HTML element. The syntax to create an element is shown below. document.createElement(tagName[, options]); Where, tagName is the name of ...
Read MoreWeekday as a number in JavaScript?
In this article, we are going learn about the weekday as a number in JavaScript with appropriate examples. To get the weekday as a number, JavaScript has provided getDay() method. The getDay() is a method from Date object. The getDay() method returns a value between 0 to 6. For example, Sunday = 0, Monday =1, Tuesday =2, Wednesday = 3 and so on. To get a better understanding, let’s look into the syntax and usage of getDay() method in JavaScript. Syntax The syntax for getDay() method is − dateObject.getDay(); Where, dateObject is an object created from date. This method ...
Read MoreMerge sort vs quick sort in Javascript
In this article, we are going to discuss about the differences between merge sort and quick sort in JavaScript with appropriate examples. Merge sort and Quick sort are used to sort the elements, but the approach is different. Both Merge sort and quick sort are based on Divide and Conquer Strategy. Merge sort It is a stable sorting algorithm. In the merge sort, it follows a recursive approach that repeatedly splits the array into half until no more division is possible i.e., the array either remains empty or has a single element. Then by comparing the two small array elements ...
Read Mored vs D in JavaScript?
This article discusses about \d vs\ D in JavaScript regex. The \d and \D meta characters are used to match the characters of a given string. \d and \D are different from each other. \d (character) is equivalent to [0-9] that means it matches any single number. The characters that are not matched by the \d are matched by the \D. \D is equivalent to [^0-9] that means it matches any character other than number. Both \d and \D are completely inverse to each other. To match a string with a pattern, the possible methods are: string.match(pattern), string.search(pattern), pattern.exec(string), pattern.test(text). ...
Read Morew vs W in JavaScript regex?
This article discusses about the \w vs \W in JavaScript regex. The \w and \W meta characters are used to match the characters of a given string. \w and \W are different from each other. \w (character) is equivalent to [a-zA-Z0-9_] that means it matches any single letter, number, or underscore. The characters that are not matched by the \w are matched by the \W. \W is equivalent to [^a-zA-Z0-9_] that means it matches any character other than letter, number and underscore. To match a string with a pattern, the possible methods are: string.match(pattern), string.search(pattern), pattern.exec(string), pattern.test(text). We use match ...
Read MoreSuper keyword in JavaScript?
In this article, we are going to discuss about the super keyword in JavaScript with suitable examples. The Super keyword is basically used in Object Oriented Programming. The Super keyword is used to call parameters and functions of an object’s parent. There are times a parent class and sub class can have same method names and parameter names. In those case, to avoid confusion between the parent class and sub class method names or parameter names, super keyword is used. In order to use a Super keyword, the child method must extend the parent class method. Syntax The syntax to ...
Read MoreExecute digits in even places in a JavaScript array?
In this article, the given task is to execute digits in even places in a JavaScript array with suitable examples. To execute the digits in even places in a JavaScript array, we need to get the starting index of the array and we need to loop through it by checking whether the index is at odd place or even place. Using the filter() Method: This method will create a new array filled with elements that pass a test provided by a specified function. This method doesn’t execute the function for empty elements and this method do not modify the original ...
Read MoreFirst and last child node of a specific node in JavaScript?
In this article we are going to learn about the first and last child node of a specific node in JavaScript along with suitable examples. To get the first and last child node of a specific node, there are existing properties called firstChild, lastChild, firstElementChild and lastElementChild. The difference between the property of firstChild and firstElementChild is that in contrast to firstElementChild, firstChild treats both text and comments contained within html elements as children. The firstChild also considers the whitespace in the text. The same is applicable for lastChild and lastElementChild. To get the first child of a list The ...
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