Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
Articles by Samual Sam
Page 37 of 151
toDataURL throw Uncaught Security exception in HTML
The toDataURL() method throws an "Uncaught Security Exception" when trying to convert images from external domains to base64. This happens due to CORS (Cross-Origin Resource Sharing) restrictions that prevent accessing pixel data from cross-origin images. The Problem When you load an image from a different domain and try to use toDataURL(), the browser blocks access to prevent potential security vulnerabilities: function getBase64() { var img = document.getElementById("myImage"); var canvas = document.createElement("canvas"); var ctx = canvas.getContext("2d"); ...
Read MoreHow to detect the browser's format for HTML input type date
HTML input elements with type="date" always use the ISO 8601 format (YYYY-MM-DD) internally, but browsers display dates according to the user's locale settings. Here's how to work with both formats. Understanding Date Input Formats The input[type="date"] element stores values in ISO format (YYYY-MM-DD) regardless of how the browser displays it to the user. The valueAsDate property provides a JavaScript Date object for easier manipulation. Getting Current Date in ISO Format Set Current Date function setCurrentDate() { const today = new Date().toISOString().substr(0, 10); document.getElementById('dateInput').value ...
Read MoreUsage of width property with CSS
The width property in CSS is used to set the width of elements, including images. This property accepts values in various units such as pixels (px), percentages (%), em, rem, and other CSS length units. When using percentage values, the width is calculated relative to the containing element's width. Syntax width: value; Common Values Pixels (px): Absolute unit - width: 200px; Percentage (%): Relative to parent container - width: 50%; Auto: Browser calculates width automatically - width: auto; Em/Rem: Relative to font size - width: 10em; Example: Setting Image Width ...
Read MoreClient-side image processing with HTML
Client-side image processing allows you to manipulate images directly in the browser using HTML, CSS, and JavaScript without server uploads. This approach provides instant feedback and reduces server load. HTML Structure for Image Processing Start with a basic HTML structure that includes file input and canvas elements: Client-side Image Processing Image Processing Demo ...
Read MoreWhat is the most efficient way of assigning all my HTML5 video sources as trusted without having to loop over all of them
In AngularJS applications, you can efficiently trust all HTML5 video sources by configuring the $sceDelegateProvider in your app's config phase. This eliminates the need to loop through individual video elements. Understanding SCE (Strict Contextual Escaping) AngularJS uses SCE to prevent XSS attacks by restricting resource URLs. Video sources must be explicitly trusted or whitelisted to load properly. Global Video Source Whitelisting Configure trusted video sources globally in your application module: app.config(function($sceDelegateProvider) { $sceDelegateProvider.resourceUrlWhitelist([ // Allow same origin resource loads ...
Read MoreCSS padding property
The padding property sets the internal space between an element's content and its border. It creates space inside the element on all four sides: top, right, bottom, and left. Syntax padding: value; padding: top-bottom left-right; padding: top left-right bottom; padding: top right bottom left; Padding Values The padding property accepts various units: px - Fixed pixels % - Percentage of parent element's width em/rem - Relative to font size auto - Browser calculates automatically Examples Single Value (All Sides) ...
Read MoreBlank PNG image is shown with toBase64Image() function
If a blank PNG image is shown with the toBase64Image() function, this typically occurs because the function is called before the chart finishes rendering. Here are two solutions to ensure the chart is fully rendered before converting to base64. Solution 1: Using Animation onComplete Callback Wait for the chart animation to complete before calling toBase64Image(): animation: { duration: 2000, onComplete: function (animation) { var base64Image = this.toBase64Image(); console.log(base64Image); ...
Read MoreWhich browsers support the HTML5 History API?
The HTML5 History API allows web applications to manipulate browser history programmatically, enabling single-page applications to update URLs without full page reloads. Understanding browser support is crucial for implementing this feature effectively. Browser Support Overview The HTML5 History API is now widely supported across modern browsers. WebKit-based browsers and Firefox 4 were among the first to implement this feature, but support has expanded significantly since then. Supported Browsers Firefox: Version 4 and above Google Chrome: All versions (since Chrome 5) Internet Explorer: Version ...
Read MoreSet width between table cells with CSS
The border-spacing CSS property controls the distance between adjacent table cells. It only works when border-collapse is set to separate (the default value). Syntax border-spacing: horizontal vertical; border-spacing: value; /* same for both directions */ Parameters The property accepts one or two length values: One value: Sets equal spacing horizontally and vertically Two values: First value for horizontal spacing, second for vertical spacing Example: Basic Border Spacing table.example { ...
Read MoreAtomics.xor() function in JavaScript
The Atomic object of JavaScript is an object that provides atomic operations such as add, sub, and, or, xor, load, store etc. as static methods. These methods are used with SharedArrayBuffer objects for thread-safe operations in multi-threaded environments. The xor() function of the Atomics object accepts an array, position, and value, then performs a bitwise XOR operation on the value at the given position atomically. Syntax Atomics.xor(typedArray, index, value) Parameters typedArray - A shared integer typed array (Int8Array, Uint8Array, Int16Array, etc.) index - The position in the array to operate on value ...
Read More