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Front End Technology Articles
Page 415 of 652
How to use an HTML button to call a JavaScript function?
We use the onclick event attribute property of the HTML button to call a JavaScript function. The JavaScript code provided in the onclick attribute executes when the button is clicked. There are various attributes provided with the button tag in HTML that allows us to customize the button's functionality and also let us decide how and what the button triggers. Using the onclick Event in JavaScript The onclick event of the button element expects JavaScript code that is triggered when the button is clicked upon. So we put the function that needs to be called in the onclick ...
Read MoreHow to read data from *.CSV file using JavaScript?
In this article, we are going to learn how to read data from *.CSV file using JavaScript. To convert or parse CSV data into an array, we need JavaScript's FileReader class, which contains a method called readAsText() that will read a CSV file content and parse the results as string text. If we have the string, we can create a custom function to turn the string into an array. To read a CSV file, first we need to accept the file. Now let's see how to accept the csv file from browser using HTML elements. ...
Read MoreHow to change the font color of a text using JavaScript?
This tutorial teaches us to change the font color of text using JavaScript. While working with JavaScript and developing the frontend of an application, you may need to change the font color of text when an event occurs. For example, if you have an application that can turn a device on or off with a button, you might want the button text to be green when the device is on and red when it's off. JavaScript provides several methods to accomplish this dynamic color changing. Using the style Property The most common approach is to access an ...
Read MoreHow to get first and last date of the current month with JavaScript?
In this tutorial, we will look at how to get the first and last date of the current month using JavaScript. Working with dates is common in web development, especially when building calendars, date pickers, or time-based features. JavaScript provides built-in methods to handle dates, and there are also external libraries that make date manipulation easier. Following are the approaches to get the first and last date of the month using JavaScript − Using a Date Object Using the Moment.js Library Using a Date Object JavaScript's built-in ...
Read MoreHow to pass an object as a parameter in JavaScript function?
In this tutorial, we will learn how to pass an object as a parameter in a JavaScript function. One of JavaScript's data types is represented by the Object type. It is used to store keyed collections as well as more complex entities. The Object() constructor or the object initializer / literal syntax can be used to create objects. Almost all JavaScript objects are instances of Object; a typical object inherits properties (including methods) from Object.prototype, though these properties may be shadowed (a.k.a. overridden). Following are the methods used to pass an object as a parameter in a ...
Read MoreHow to compare two objects in JavaScript?
Objects in JavaScript are entities that consist of properties and types. For example, a car object might have properties like color, price, height, and width. const car = { color: 'Black', price: 2500000, height: '6 feet', width: '5 feet' } The equality operator (===) verifies whether two operands are equal and returns a Boolean value. However, it cannot directly compare objects because objects are reference types. document.write('tutorix' === 'tutorix' ...
Read MoreHow to add 2 hours to a JavaScript Date object?
In this tutorial, we will learn how to add 2 hours to a JavaScript Date object. Here we will discuss two methods which are following. Using the getTime() Method Using the setHours() Method Using the getTime() Method JavaScript date getTime() method returns the numeric value corresponding to the time for the specified date according to universal time. The value returned by the getTime() method is the number of milliseconds since 1 January 1970 at 00:00:00. Syntax Date.getTime() Approach To add 2 hours to the Date Object first, we get ...
Read MoreHow to remove event handlers in JavaScript?
An event is defined as a change in an object's state. There are a number of events in HTML that show when a user or browser performs a certain action. JavaScript responds to these events when JavaScript code is embedded in HTML and allows execution. The process of responding to events is known as event handling. As a result, JavaScript uses event handlers to handle HTML events. In this article, we are going to discuss how to remove event handlers in JavaScript. Here, we use the removeEventListener() method to remove an event handler from an element in JavaScript. ...
Read MoreHow to count JavaScript array objects?
In this tutorial, we will learn to count JavaScript array objects. The array is the data structure containing the strings, numbers, objects, etc., in JavaScript. The object is the one kind of entity that contains properties and methods related to it. We can access the object's properties and invoke the object method using the object's references. Generally, To find the array length, we can use the array.length property and it returns the total number of elements that the array includes. But what if we need to count only object elements? Here, this tutorial has various approaches to counting ...
Read MoreHow to format a number with two decimals in JavaScript?
This tutorial will teach us how to format a number with two decimals using JavaScript. Formatting a number means rounding the number up to a specified decimal place. In JavaScript, we can apply many methods to perform the formatting. Some of them are listed as follows − The toFixed() Method Math.round() Method Math.floor() Method Math.ceil() Method Using toFixed() Method (Recommended) The toFixed() method formats a number with a specific number of digits to the right of the decimal. It returns a string representation ...
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