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JavaScript onclick() Events – Tutorial, With Examples

JavaScript onclick() Tutorial

JavaScript adds interactivity to web pages. This article shows you how to trigger JavaScript functions when an HTML element is clicked using onclick() events and attributes. Code examples included. JavaScript Events An event in JavaScript simply means that something has happened. The mouse has moved, or a key has been pressed, and JavaScript has been notified by the raising of an event. onclick Event When the user clicks on something, the onclick event is raised, allowing you to trigger some JavaScript code when an element is clicked. … Read more

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JavaScript vs Java – What’s the Difference Which to Use in 2021?

JavaScript vs Java

Here’s a clear article on what makes Java and JavaScript different – and some information to help you make the choice on which to learn and use for your projects in 2021. First up, it’s important to clarify that JavaScript and Java are not the same things! They just have similar names. It’s stupid, and they should have called JavaScript something else (and tried to re-badge it ECMA Script, which is also a terrible name), but the JavaScript name stuck. Now we’re all stuck with two different programming languages … Read more

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Using The isNaN() Function in JavaScript, With Examples

JavaScript isNan()

isNaN() is a JavaScript function that will tell you whether a value is equal to NaN – or Not a Number. It can be used to determine whether the result of a mathematical operation is valid or not. Here’s how to use it. What is NaN? NaN is a special value that means Not a Number. It means that a value that should be a number could not be parsed as a number. Any mathematical operation between any other value and NaN will result in NaN. It usually means something has … Read more

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jQuery vs JavaScript – Differences? Which is Better?

jQuery vs JavaScript

This article will explain what JavaScript and jQuery are, how they differ, and how/why they should be used. What is JavaScript JavaScript began life in the mid-1990s as a scripting language for adding interactivity to web pages. Over time it has been developed into a full-featured programming language, which can even be run outside the web browser (more detail on this in our Node.js article). You can also see our article outlining the differences between JavaScript and Typescript here. What is jQuery? jQuery is a library written in JavaScript. … Read more

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How to Refresh the Page in JavaScript using location.reload(), With Examples

JavaScript Refresh Page

Here’s a short guide to refreshing a webpage with JavaScript, with examples. There are over 500 ways to trigger a page reload using JavaScript. All but one are unofficial or are the side effect of another behavior. Here’s how to do it properly. Using location.reload() Simply call: location.reload() …anywhere in your code to trigger a page reload. It’s that easy. What about window.location.reload() ? You may see some use: window.location.reload() This is exactly the same as using location.reload() – the window object in JavaScript is the global context, so there’s usually no … Read more

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Compare JavaScript Dates (Day/Minute/Hour/Before/After), With Examples

JavaScript Compare Dates

Following on from our article on adding and subtracting time from dates in JavaScript – here’s how to compare two JavaScript date objects. This article will explore comparing dates/times with different granularity levels – from dates that are an exact month to dates that fall in the same year. Using Boolean Operators Native Javascript date objects can be compared using standard boolean/comparison operators – allowing you to compare dates by checking whether they are equal, not equal, greater than, less than, equal to or greater than, or equal to or … Read more

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Converting to Integer with JavaScript parseInt() [Examples]

JavaScript parseInt

This article will show you how to use the parseInt() function in the JavaScript programming language. JavaScript is notoriously loosely typed – meaning that variables of one type (e.g., strings of text, numerical values, boolean values) are converted to others, allowing you to perform mathematical operations on strings and silly things like that. This causes all sorts of issues – strings containing numbers may not be parsed to the expected value, and all of a sudden, you have angry clients wondering why your shiny new … Read more

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Looping over Array using JavaScript forEach(), With Examples

JavaScript foreach

This article will show you how to use the JavaScript forEach() method to loop over an array. Pretty much any application of any complexity will require the looping over arrays (lists) of data. The JavaScript forEach() method, which is built into JavaScript array variables, does just this. You’ll be using it a lot – so thankfully, it’s pretty darn easy to use. JavaScript forEach() Syntax arr.forEach(callback(currentValue[, index[, array]]) { // execute something }[, thisArg]); Note that: arr is an array or a variable containing an array callback is the … Read more

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TypeScript Vs JavaScript – What’s the Difference & Which Should You Use?

TypeScript Vs JavaScript

This article will discuss the differences between typescript and JavaScript, the problems they solve, and which is best to use. I really like TypeScript, and I use it a lot. It solves so many of JavaScript’s problems and makes writing good JavaScript code much easier (once you’ve learned to use TypeScript). So, this article is more about why you should use TypeScript (when you can use it), when/where you can use it, and the problems it solves. This article goes well with the following articles, giving you an … Read more

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Javascript eval() Function (and Why to NEVER Use It)

Javascript eval Function

The JavaScript eval() function executes a string as JavaScript. This is a massive security risk as, if used in production, it can allow third parties to execute their own code in your app. eval() Syntax eval(string) Note that: string is a string that contains JavaScript Code eval() will return the value returned by executing the code in the string Just don’t use it Example of Javascript eval() This article gets one example only so you can see how eval() works, so that if you accidentally fall on your keyboard and the … Read more