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In this tutorial, we will learn how to preselect a select list item using JavaScript. It is given an id attribute to be associated with a for accessibility purposes and a name attribute represents the name of the associated data point submitted to the server. element nestled inside the is used to define each menu option. Each element have a value attribute that contains the data value to submit to the server when that option is selected. If no value attribute is specified, the value is set to the text contained within the element.You can include ... Read More
In this tutorial, we will learn how to invoke a JavaScript Function with the 'new' Function Constructor. Functions are a set of reusable codes that perform a specific task and may return a value. In JavaScript, functions are defined by the keyword function. A function may not have any parameters and may also not have any return statement. In JavaScript, we also have functions with no function names, called anonymous functions Using the 'new' Function Constructor The Function constructor makes a new Function object. By using the constructor, we can create a function dynamically. It takes parameters, or arguments, and ... Read More
In this tutorial, we will learn how to invoke a JavaScript Function as a method. In JavaScript, the code inside a function will execute when the function is invoked. We can invoke a function in a variety of ways. One of them is using the method. The method is a property of an object that has a function value. We can define functions as object methods. This function will have a function name, a parameter (optional), and a return type (optional). It will have a "this" keyword which refers to an object. Users can follow the syntax below to declare ... Read More
In this tutorial, we will learn how to invoke a JavaScript Function as a function. Functions are a set of reusable codes that perform a specific task and may return a value. In JavaScript, functions are defined by the keyword function. A function has different parts, like a function name, parameter list, function body, and return statement. A function may not have any parameters and may also not have any return statement. In JavaScript, we also have functions with no function names, called anonymous functions. Users can follow the syntax below to declare a function. // function declaration function function_name(parameter1, ... Read More
In this tutorial, we will learn how to initialize a boolean array in JavaScript. We can initialize a boolean array in JavaScript in three ways− Using the fill() Method Using the Array from() Method Using the for Loop Using the fill() Method We can initialize a boolean array using the fill() method. The fill() method sets the static value of all array elements from the beginning index to the end index. Syntax //initialization of boolean array with fill() method let arrayName = new Array(array_length).fill(true/false); In the above syntax, we create an array with the name "arrayName" ... Read More
In this tutorial, we will learn how to include inline JavaScript inside an HTML page. Include inline JavaScript using onclick Event Just like an alert message showing up from the inline JavaScript inside an HTML page, we can also declare a function and call it. This method enabled us to write multiline code inside of a JavaScript function to do more tasks than just an alert message showing. In this example, we will change an element's text and background color by invoking a function from inline JavaScript code. Users can follow the syntax below to include inline JavaScript inside an ... Read More
In this tutorial, we will look at a few ways to prevent duplicate JavaScript variable declarations and comparison between them from understanding which one is suitable in a given context. The best way to prevent duplicate variable declaration is to avoid creating global variables. Let’s move forward to discuss this. Wrapping Code Within a Function Here, the variables declared inside the function are not accessible outside the function and vice versa. Users can follow the syntax below for using this method. Syntax (function(){ var varNam = "test"; }()) Here varNam is wrapped inside a function. Example ... Read More
In this tutorial, we will learn how to perform the numeric Sort in JavaScript. We can arrange the given numerical values by numerical sorting into ascending or descending order In JavaScript, we use the sort () method to sort numerical values. This method sorts the arrays of numbers, strings, and objects. It sorts the elements of an array and changes the order of the original array's elements. The array elements are cast to strings to determine the order and then compared and sorted. arr.sort() Where arr is the array of numeric elements that need to be sorted, this method ... Read More
In this tutorial, we will learn how to perform integer division and get the remainder in JavaScript. The division operator (/) returns the quotient of its operands, where the dividend is on the left, and the divisor is on the right. When another splits one operand, the remainder operator (%) returns the residual. It always takes the dividend sign. In the operation x% y, x is known as the dividend, and y is known as the divisor. If one of the operands is NaN, x is Infinity, or y is 0, the operation returns NaN. Otherwise, the dividend x is ... Read More
In this tutorial, we will learn to load the previous page in the history list in JavaScript. The Window object in JavaScript accesses the window in the browser. This object contains many properties and methods required to do the tasks. The Window object also retrieves the information from the browser window. There is a history stack in every browser that saves the pages visited by the user. To access this history stack, we can use the history object that is the property of the Window object. By accessing the history from the browser, we can go to the next or ... Read More