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Javascript Articles
Page 194 of 534
How to test if a parameter is provided to a function in JavaScript?
Testing if a parameter is provided to a function in JavaScript is an important part of writing effective code. It allows you to ensure that the arguments passed into your functions are valid and properly formatted for use within the function. In this article, we will discuss different methods for testing whether or not a parameter has been provided to a function in JavaScript. Let us understand, the term “Parameter”. A parameter is a named entity in a function definition that specifies an argument which the function can accept. It acts as a variable within the function and its value ...
Read MorePulling data from array into new independent variables JavaScript?
In JavaScript, there is a array method that allows you to easily extract data from an array and assign it to new independent variables. This can be useful when working with large datasets or when needing to access specific values within an array quickly. In this article, we will explore how to use the dot(.) notation, for pulling data from an array into new independent variables in JavaScript. Let us know, what is an Independent variable! An independent variable is a variable that stands alone and isn't influenced by any other variables. It can be manipulated or changed, and it ...
Read MoreI'm generating a list from an array. How can I know what element I'm clicking in JavaScript?
Multiple values can be kept in a single variable by using arrays. Compare that to a variable that only has room for one value. Each item in an array has a number associated with it that you may access by using, referred to as a numeric index. Arrays in JavaScript begin at index zero and can be changed using a variety of operations. The addEventListener()Method The addEventListener() is a method in JavaScript that allows an element to be assigned an event handler, which will execute when a specified event occurs. This can include things like mouse clicks, form submission, ...
Read MoreHow to dynamically create radio buttons using an array in JavaScript?
Creating radio buttons dynamically using an array in JavaScript is a useful way to provide users with multiple options for input. When the user clicks on one of the radio buttons, it will be selected and any other choices will be deselected automatically. This process can be automated by looping through an array that contains all the possible values and creating a new radio button element for each item in the array. To dynamically create radio button using an array, use the concept of createElement() and appendChild().Let’s look at the concept to understand more about dynamically creating a radio buttons. ...
Read MoreHow can I show a hidden div when a select option is selected in JavaScript?
Showing and hiding elements is a common task in JavaScript. It can be used to create dynamic user interfaces, where the content changes depending on the user's input or interaction with the page. One way of doing this is to show a hidden div when a select option is selected. This article will guide you through how to do this using JavaScript. A Boolean attribute is the one that was chosen. It indicates that a choice should be preselected when the page loads if it is present. In the drop-down list, the pre-selected option will be shown first. To ...
Read MoreReplace whitespace in different elements with the same class in JavaScript?
In this article we are going to learn about replace whitespace in different elements with same class in JavaScript. Let’s look into the article to learn more about replacing whitespaces in different elements. Using split() and join() Methods The split() method divides a string into several substrings and returns them as an array. When a separator is present in the string, the string is split according to the separator that was specified as a parameter. This parameter specifies the space character (" ") to divide the string whenever a space is present. A separator is used to join an array ...
Read MoreWhy addEventListener to 'select' element does not work in JavaScript?
When a user changes the value of an element, the , , and elements fire the change event. The change event does not always fire for every change to an element's value, unlike the input event. Instead, use querySelector() along with addEventListener(). Let’s discuss one by one to understand how they will work. The addEventListener() Method − The addEventListener() is a method used to register an event handler for the specified event type on the current element. It allows you to specify a function that will be called whenever the specified event occurs on the element. Following ...
Read MoreHow to convert a currency string to a double with jQuery or JavaScript?
If you are working with currency values in your web application, it is important to convert them from a string representation into an actual numerical value. In this article, we will discuss how to do this using both jQuery and JavaScript. We will look at the different methods available for converting strings to doubles. There are two popular ways to convert currency string into float string using different JavaScript inbuilt libraries. Let’s look into the following article to understand more about how to convert a currency string to a double with jQuery or JavaScript. This is a straightforward way in ...
Read MoreDetecting arrow key presses in JavaScript?
In this article we are going to learn about detecting arrow key presses in JavaScript. Before we jump into the article, let’s discuss few things to know some information. There is a distinct key code for each key on the keyboard. Here, we'll check to see if the arrow key has been pressed. There are four arrow keys on our keyboard. On our keyboard, we can see, the left, right, up, and download keys. These keys also have a special key code that JavaScript can utilise to determine whether, or not they have been depressed. The key codes for the ...
Read MoreHow to get the entire document HTML as a string in JavaScript?
One of the most useful features of JavaScript is the ability to get an entire document's HTML as a string. This can be used for many purposes, such as obtaining data from a website or creating dynamic content on your own website. In this article, we'll go over how to get the entire document HTML as a string in JavaScript. To get the entire document HTML as a string, use the concept of innerHTML The dynamic html can be written on the html document using the innerHTML property. The majority of the time, it is used in web pages to ...
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