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Web Development Articles
Page 376 of 801
Storing Credentials in Local Storage
Local Storage is designed for data that spans multiple windows and persists beyond the current session. Web applications can store megabytes of user data on the client side for performance reasons. However, storing credentials requires special security considerations. For secure credential storage, never store actual passwords or sensitive authentication data directly in local storage. Instead, use a token-based approach that minimizes security risks. Secure Token-Based Authentication On successful login, generate a completely random token string unrelated to user credentials. Store this token in your database with an expiry date, then pass it to JavaScript for local storage. ...
Read MoreHow to display HTML5 client-side validation error bubbles?
HTML5 provides built-in client-side validation with error bubbles that appear when users try to submit invalid form data. The required attribute and input types like email automatically trigger these validation messages. Basic Required Field Validation The required attribute prevents form submission if the field is empty and displays a validation bubble: HTML5 Validation Enter Email: ...
Read MoreHow not to validate HTML5 input with required attribute
To avoid validation on specific form elements in HTML5, use the formnovalidate attribute on submit buttons or the novalidate attribute on the form itself. This allows you to bypass HTML5's built-in validation for required fields when needed. Using formnovalidate Attribute The formnovalidate attribute can be added to submit buttons to skip validation for that specific submission: HTML formnovalidate attribute Rank: ...
Read MoreCSS content: attr() on HTML5 progress doesn't work
The CSS content: attr() function doesn't work directly with HTML5 elements due to browser rendering limitations. Here's how to work around this issue. The Problem When you try to use content: attr() with progress elements, it fails because progress bars use special internal pseudo-elements that don't support generated content in the same way as regular elements. HTML Structure .progress-container { position: relative; ...
Read MoreHow to best display HTML5 geolocation accuracy on a Google Map?
To display HTML5 geolocation accuracy on a Google Map, you need to combine the Geolocation API with Google Maps to show both the user's position and the accuracy radius as a circle. Basic Setup First, get the user's location using the HTML5 Geolocation API and extract the accuracy information: Geolocation Accuracy on Map function initMap() { ...
Read MoreWhat HTML5 File.slice method actually doing?
The HTML5 Blob.slice() method creates a new Blob object containing a subset of data from the source Blob. It's particularly useful for processing large files in chunks or extracting specific portions of binary data. Syntax blob.slice(start, end, contentType) Parameters The slice() method accepts three optional parameters: start - Starting byte position (default: 0) end - Ending byte position (default: blob.size) contentType - MIME type for the new blob (default: empty string) Basic Example // Create a blob with text content var originalBlob = new ...
Read MoreHow to draw a 3D sphere in HTML5?
To create a 3D sphere in HTML5, you need to use the canvas element along with mathematical calculations to plot points in 3D space and project them onto a 2D canvas. This involves creating vertices using spherical coordinates and rendering them as a wireframe or solid sphere. Basic Sphere Class Structure First, let's create a Point3D class and a sphere display function: 3D Sphere // Point3D class to represent ...
Read MoreHTML5 video not working with jquery bxSlider plugin on iPad
When using HTML5 video with the bxSlider jQuery plugin on iPad, video playback often fails due to iOS-specific requirements and plugin compatibility issues. This guide shows how to properly configure bxSlider to work with HTML5 videos on iPad. Setup Requirements First, download the bxSlider plugin from the official website. Extract the downloaded zip file and locate the images folder. Copy this images folder into your project's js directory. Required Files Structure Include the following files in your project with proper linking: HTML Structure for Video Slider Structure ...
Read MoreConfiguring any CDN to deliver only one file no matter what URL has been requested
Content Delivery Networks (CDNs) are typically designed to serve static files based on specific URL paths. However, there are scenarios where you need a CDN to deliver the same file regardless of the requested URL - commonly used for Single Page Applications (SPAs) that rely on client-side routing. Why Serve One File for All URLs? Single Page Applications like React, Vue, or Angular apps use client-side routing. When users navigate to different URLs, the same index.html file should be served, and JavaScript handles the routing internally. Method 1: Using CloudFlare Page Rules CloudFlare allows you to ...
Read MoreHow to draw sine waves with HTML5 SVG?
To draw sine waves with HTML5 SVG, you can use the element with cubic Bezier curves to closely approximate the smooth curves of a sine wave. This approach provides precise control over wave shape and amplitude. Basic Sine Wave Example Here's how to create a simple sine wave using SVG path with cubic Bezier approximation: SVG Sine Waves HTML5 SVG Sine Wave ...
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