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Use appendChild() in JavaScript to Add Page Elements [Examples]

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JavaScript appendChild()

The Node.appendChild() method adds a new HTML Element to the page (via the DOM). This article will show you how to use it. The DOM in JavaScript The HTML DOM (Document Object Model) is the interface which JavaScript uses to read from and interact with HTML page elements. It’s a data structure which represents every HTML tag present on the page – everything from the root <html> element that wraps your page to every <div>, <p>, <input>, and <em> – everything on the page is represented in the DOM, both content and structure. Each … Read more

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JavaScript setAttribute() Method-What It Is/How to Use It [Examples]

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JavaScript setAttribute()

JavaScript was built for adding interactivity to web pages. It can interact with and modify on-screen elements, including their HTML attributes – thats what setAttribute() does. Here’s how to use it. What is the HTML DOM? The HTML DOM (Document Object Model) is the interface which JavaScript uses to read from and interact with HTML page elements. It’s a data structure which represents every HTML tag present on the page – everything from the root <html> element that wraps your page to every <div>, <p>, <input>, and <em> – everything on the page is … Read more

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How to Create and Use JavaScript Classes [Examples]

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JavaScript Class

This tutorial will explain JavaScript classes and how they relate to objects. Syntax and code examples are provided. But first, a quick refresher on JavaScript objects. JavaScript Objects In JavaScript, objects are a container for a set of properties and methods. A car, for example, could be modelled as an object. It could have properties describing the manufacturer, year it was made, and the colour. Methods are functions which are part of the object, which when called, interact with the object in some way. A car might have a honk method which triggers an alert, … Read more

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JavaScript Functions Tutorial, With Examples

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JavaScript Functions

Functions are reusable bits of code which are encapsulated so that you can easily call them by name when you need them. Here’s how they work in JavaScript, with examples. What are Functions? When programming, you will need to perform the same set of actions multiple times on different data. For example, you may need to perform a calculation on all of the rows in a table, or update the values in a list of objects. It is not wise, or practical, to re-write the same … Read more

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Current Time in Another Location/Timezone [JavaScript]

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JavaScript conver time to another timezone

This article will demonstrate how to get the current time in another location/timezone in Javascript, with just one line of code. The Simplest Pure-JavaScript Way The below function converts a given date to a different timezone, and contains just 1 line of code. function timezoneConvert(date, tzString) { return new Date((typeof date === “string” ? new Date(date) : date).toLocaleString(“en-US”, {timeZone: tzString})); } This function expects: A date, as either a Date object or string A string containing the name of the timezone to convert to This … Read more

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How to Create a Countdown Timer in JavaScript

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JavaScript Countdown Timer

This tutorial will demonstrate how to create a countdown timer in JavaScript, including a function you can copy and paste into your own code. The below code will break down creating a function which calculates the time until a certain future time, and how to run it repeatedly to affect a count down timer. Getting the time remaining until a certain date/time The below function will calculate the days, hours, minutes, and seconds to a target date: function timeToTarget(countdownString){ // Convert the string which specifies … Read more

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Find/Replace Text in JavaScript with replace() [Examples]

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JavaScript find/replace text

This quick tutorial will show you how to find and replace text in JavaScript, with code examples. Replacing text in strings is something you will probably need to do quite often. JavaScript comes with the replace() method as part of it’s String objects to handle this functionality. JavaScript Strings JavaScript Strings are a type of variable used to store and manipulate a sequence of characters. There are also string primitives which represent only the characters and do not contain methods for manipulation, but JavaScript will implicitly convert between the two when required. The … Read more

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The startsWith() Method for JavaScript Strings [Examples]

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JavaScript startswith()

The startsWith() String method in JavaScript will determine whether a string starts with a certain string or character. Here’s how it is used, with code examples. startsWith() Method JavaScript Syntax The startsWith() method can be called from any String variable. string.startsWith(SEARCH, START) Note that: string can be any string value or variable SEARCH should be the string which you want to check if string starts with START is OPTIONAL If specified, START will be used as the starting position when checking STRING The portion of the string before START will be ignored This can be useful if you want to check whether a … Read more

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Formatting Numbers with the JavaScript toFixed()* Method [Examples]

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JavaScript toFixed()

This tutorial will show you how to format numbers to a fixed number of decimal places in the JavaScript programming language. JavaScript Number Variables JavaScript variables have different types. The type of a variable defines what kinds of values it can hold, and what can be done with that value. Number typed variables hold numeric values and include a number of methods (built in functions) for performing numeric operations. Number variables are declared by simply assigning a numeric value to a variable, or using the Number … Read more

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The JavaScript toString() Method, Explained + Examples

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JavaScript toString()

One of the most common things you will want to do with a variable is to print a string representation of it. That’s what the toString() method is for. This article will explain when and how you can use it. Converting to Strings Data is displayed on your computer screen is most frequently displayed as text strings, regardless of how the data was stored. Numbers, arrays, boolean values, and objects, all have string representations that allow them to be viewed as text on screen, either for the … Read more