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Posts Tagged :

javascript

Why doesn’t getElementById() work for elements created dynamically?

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Why Doesn’t getElementById() Work for Dynamically Created Elements? If you’re working with JavaScript and dynamically creating HTML elements after the DOM has already been loaded, you might run into issues where getElementById() doesn’t seem to work. Here’s why and how to fix it. 1. DOM Loading Order When the page first loads, the browser parses…

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What’s the difference between .map(), .forEach(), and .filter()?

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When working with arrays in JavaScript, you often need to manipulate or iterate over the data. Three popular methods for this are .map(), .forEach(), and .filter(). Although they seem similar, they serve different purposes. Here’s a breakdown of each. 1. .map() .map() is used to transform each element of an array by applying a function…

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Why isn’t my click event working with dynamically created elements?

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One common issue developers face in JavaScript is when a click event does not work for dynamically created elements. If you’ve written code to attach a click event to an element, and it works for static elements but not for newly created ones, you’re likely encountering an issue with event binding. Understanding Event Binding When…

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How dO multiple modals for gallery website using HTML CSS JAVASCRIPT ?

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Here’s a simple implementation of multiple modals for a gallery website using HTML, CSS, and JavaScript. Each image in the gallery will have its own modal. When an image is clicked, a modal opens to display a larger version of the image with a close button. HTML htmlCopy code<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8">…

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What are the differences between PHP and other server-side languages?

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PHP is a popular server-side scripting language, and when comparing it to other server-side languages like Python, Ruby, Java, and Node.js, several differences emerge based on language syntax, performance, ease of use, community support, and intended use cases. Below is a breakdown of the key differences between PHP and other major server-side languages: 1. PHP…

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What is the DOM, and how do you manipulate it in JavaScript?

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The DOM (Document Object Model) is a programming interface for web documents, representing the structure of a webpage as a tree of objects. When a web page is loaded, the browser parses the HTML and creates a DOM. The DOM allows JavaScript to interact with the webpage, modifying its content, structure, and style dynamically. Think…

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How can you handle asynchronous code in JavaScript using async/await?

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What is Async/Await in JavaScript? async: A keyword used to declare a function as asynchronous. It allows the function to return a Promise implicitly. await: A keyword used to pause the execution of an async function until a Promise is resolved or rejected. It can only be used inside an async function. In essence, async/await…

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What are closures in JavaScript, and how do they work?

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  What are Closures in JavaScript? A closure is a function that “remembers” the environment in which it was created, even after that environment has finished executing. Specifically, closures give you access to an outer function’s scope from within an inner function, allowing the inner function to continue accessing variables of the outer function, even…

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How to strike unchecked radio buttons’ label only when there is one checked radio button?

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To style the labels of unchecked radio buttons when there is only one checked radio button, you’ll need to use a combination of CSS and JavaScript (or jQuery). Here’s a step-by-step approach to achieve this: HTML Structure Make sure your HTML structure is something like this: <div> <input type="radio" id="radio1" name="group" value="1"> <label for="radio1">Option 1</label>…

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Failed to execute ‘drawImage’ on ‘CanvasRenderingContext2D’ even though image source is correct?

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The error “Failed to execute ‘drawImage’ on ‘CanvasRenderingContext2D'” usually occurs when trying to draw an image on a canvas before it is fully loaded. Here are steps to ensure the image loads properly: Example Code <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Canvas Draw Image Example</title> </head> <body> <canvas id="myCanvas" width="500" height="500"></canvas> <script> const canvas…

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If You need solution with javascript for a form when I turn page?How

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To implement a solution with JavaScript that retains form data when the user turns the page, you can use localStorage to save the form data and retrieve it when the page loads again. Step 1: HTML Form <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Form with Local Storage</title> </head> <body> <form…

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Substitute photos after and before by scaling ?

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To substitute photos with a scaling effect, you can use CSS and JavaScript to animate the transition. Here’s an example to achieve this: HTML : <!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Photo Substitution with Scaling</title><link rel="stylesheet" href="styles.css"></head><body><div class="photo-container"><img id="beforePhoto" src="before.jpg" alt="Before Photo"><img id="afterPhoto" src="after.jpg" alt="After Photo" class="hidden"></div><button onclick="togglePhotos()">Toggle Photos</button><script src="script.js"></script></body></html> CSS (styles.css) .photo-container {position: relative;width:…

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Do javascript promises require specific variables names for response?

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  No, JavaScript promises do not require specific variable names for the response. You can use any variable name you prefer when handling the resolved value of a promise. Here’s an example to illustrate this: JavaScript : // Example Promiseconst myPromise = new Promise((resolve, reject) => {setTimeout(() => {resolve('Success!');}, 1000);});// Handling the promisemyPromise.then(response => {console.log(response);…

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How do I get this js validation running?

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To help you get your JavaScript validation running, please provide the specific code or describe what the validation is supposed to do. Here are some general steps to ensure basic JavaScript form validation works: Html : <form id="myForm"><input type="text" id="username" name="username" required><input type="email" id="email" name="email" required><input type="submit" value="Submit"></form><div id="error-message"></div> JavaScript Validation: document.getElementById('myForm').addEventListener('submit', function(event) {const username…

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Why is the Website Popup animation not working?

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There could be several reasons why your website popup animation isn’t working. Here are a few common issues to check: CSS Issues: Ensure you have defined the necessary CSS animations and applied them correctly to the popup element. @keyframes popupAnimation {from { transform: scale(0); }to { transform: scale(1); }}.popup {animation: popupAnimation 0.5s forwards;} JavaScript Issues:…

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Azure tts api about getting voice lists for azure text to speech ?

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To get a list of available voices for Azure Text-to-Speech using JavaScript, you can make a call to the Azure Text-to-Speech API’s endpoint for listing voices. Here is an example: JavaScript : const subscriptionKey = 'YOUR_SUBSCRIPTION_KEY';const region = 'YOUR_REGION';async function getVoicesList() {const response = await fetch(`https://${region}.tts.speech.microsoft.com/cognitiveservices/voices/list`, {headers: {'Ocp-Apim-Subscription-Key': subscriptionKey}});if (!response.ok) {throw new Error('Error fetching voices…

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How unlink a function from the server [duplicate] ?

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To unlink a function from a server, you typically need to: Remove Event Listeners: If the function is tied to an event, use removeEventListener to detach it. JS (JavaScript) : element.removeEventListener('event', functionName); Clear Intervals/Timeouts: If the function is invoked using setInterval or setTimeout, clear them with clearInterval or clearTimeout. clearInterval(intervalId);clearTimeout(timeoutId); Unsubscribe: For pub-sub or observer…

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localStorage Value is Stored and Loaded Correctly but Not Applied to Checkbox Input?

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If you are trying to store and load the state of a checkbox input using localStorage, but the state is not being applied correctly, ensure you are properly retrieving and setting the checkbox state when the page loads. Here is an example to demonstrate this: HTML : <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta…

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