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Javascript Articles
Page 150 of 534
How to preselect Dropdown Using JavaScript Programmatically?
In this tutorial, we will learn how to preselect Dropdown using JavaScript Programmatically. A dropdown list is a toggle menu that allows the user to select one of several options. The options in this list are defined here in coding and are linked to a unique function. When you click or choose this option, that function is triggered and begins to work. A dropdown list allows us to select only one item from a list of options. To construct a basic dropdown list in HTML, the tab is combined with the, tab. Following that, JavaScript assists in performing ...
Read MoreHow to load a JavaScript function using the variable name?
In this tutorial, we will learn to load a JavaScript function using the name of a variable. Functions are the block of statements that takes an input and displays the result to the user after an execution. We can use these blocks of codes repeatedly by only declaring the function, and these functions can help a programmer in many ways as it also reduces efforts. JavaScript also supports the use of functions like other programming languages. Functions in JavaScript can be either built-in or user-defined. There are different ways to declare a function and call it. Generally, a simple Function ...
Read MoreHow to get the smallest integer greater than or equal to a number in JavaScript?
In this tutorial, we will learn how to get the smallest integer greater than or equal to a number in JavaScript. To get the smallest integer greater than or equal to a number, use the JavaScript Math.ceil() method. This method returns the smallest integer greater than or equal to a given number. In other words, the Math.ceil() method rounds a number and returns an integer result. Because the ceil() method is a static function of the Math object, it must be invoked via the Math placeholder object. The ceil() method produces the lowest integer value that is bigger than or ...
Read MoreHow to get the largest integer less than or equal to a number in JavaScript?
In this tutorial, we will learn how to get the largest integer that can be less than or equal to a number in JavaScript. To get the largest integer less than or equal to a number, we use the Math.floor() method in JavaScript. It is used to round off a number supplied as a parameter to its closest integer towards the downward direction of rounding, i.e., towards the less significant value. Following are two ways in which we find the largest integer that can be less than or equal to a number in JavaScript. Using Math.floor() Method The method Math.floor() ...
Read MoreHow to get the id of a form containing a dropdown list with JavaScript?
In this tutorial, we will learn how to get the id of a form containing a dropdown list using JavaScript. The id property of an HTML element gives a unique id. The id property value must be unique inside the HTML content. The style sheet property points to a specific declaration of style. JavaScript also uses it to access and alter the element with the specified id. The id property is used to provide an element with a unique identifier. On a web page, you cannot have more than one element with the same id. A dropdown menu in a ...
Read MoreHow to include JavaScript in HTML Documents?
In this tutorial, we will learn how to include JavaScript in HTML Documents. To include JavaScript in HTML Documents, use the tag. JavaScript can be implemented using JavaScript statements that are placed within the ... . You can place the tags, containing your JavaScript, anywhere within your web page, but it is normally recommended that you should keep it within the tags. We will discuss the following three approaches to include JavaScript in HTML documents − Embedding code (within head or body) Inline Code (inside any element) External file (outside the HTML file) By Embedding ...
Read MoreHow to handle tabs, line breaks and whitespace in a text in JavaScript?
In this tutorial, we will learn how to handle tabs, line breaks, and whitespace in a text in JavaScript. To handle tabs, line breaks, and whitespace in text in JavaScript, we can use the whiteSpace property. This property has seven attributes − normal nowrap pre pre-line pre-wrap initial inherit Generally, in HTML we use the entity for multiple spaces and the tag to get line break. But in JavaScript, we use different attribute properties (mainly the normal and pre) of white-space properties to handle the tabs, line breaks, and multiple whitespaces. The details of these two ...
Read MoreHow to play a multimedia file using JavaScript?
In this tutorial, we will learn how to play a multimedia file using JavaScript. The multimedia file is the audio and video files. The multimedia files can be of different formats. wav and mp3 are two examples of audio file formats, whereas mp4 and mkv are examples of video file formats. In HTML, multimedia files can be shown easily using different tags. We use the video tag for showing a video, and for audio, we use the audio tag. These two tags are quite similar, and many attributes are the same in both tags. The "src" attribute defines the path ...
Read MoreHow to pass JavaScript Variables with AJAX calls?
In this tutorial, we will learn how to pass JavaScript Variables with AJAX calls. AJAX stands for Asynchronous JavaScript and XML. As the name suggests, it performs asynchronous operations on your web page. AJAX communicates with the server by HTTP requests and gets the required data as an HTTP response. We can control these HTTP requests by passing the JavaScript variables with AJAX calls. There are various types of HTTP requests, and in this tutorial, we will discuss the most popular HTTP requests by using AJAX and also pass JavaScript variables with it. Pass JavaScript Variables with “GET” AJAX calls ...
Read MoreHow to get the number of seconds between two Dates in JavaScript?
In this tutorial, we will learn how to get the number of seconds between two dates with JavaScript. There are different methods for checking the number of days, hours, and seconds that are commonly used to provide information related to data. Since you can’t manually change the count of the years and months, we follow some simple tricks to get the number in JavaScript. Using the Date getTime() Method In JavaScript, we use different methods to calculate the days, hours, and seconds. Most popular way to calculate the time is .getTime(). However, you will get the result in milliseconds and ...
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