Keenwon Technical Demos and Documentation

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https://keenwon.com

A collection of technical demonstrations and documentation covering various web development topics, including Jasmine testing matchers (such as toBe, toEqual, and toContain), FullCalendar Event Object documentation, and CSS/HTML layout examples like nine-grids.

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What's inside Keenwon

  1. Overview of fede2 development environment

    fede2 is a frontend development environment generator based on CommonJS and Webpack. It is designed to enable decoupled frontend and backend development by providing tools for interface mocking, environment-specific configurations, and request interception. It uses Express for the server, Gulp for automation, and Jade for templating.
    # Installation via Yeoman
    npm install -g generator-fede yo
    yo fede
  2. Overview of jqPaginator pagination plugin

    jqPaginator is a flexible jQuery-based pagination component designed to be independent of specific CSS frameworks. It achieves this by allowing high levels of customization for the HTML structure, making it adaptable to various website styles and scenarios.
  3. Overview of webpack features

    webpack is a tool for building and loading modules on the client side. Its key features include:

    • Support for AMD and CommonJS modules, and ES6 support via loaders.
    • Integration with package managers like npm and bower.
    • Ability to load non-JavaScript assets such as CSS and templates.
    • Support for on-demand module loading.
    • Ability to be embedded within development services (e.g., Express or Gulp).
  4. Overview of AntColony Magnet Link Crawler

    AntColony is the core component of the Findit search engine. It is designed to collect active resource infohashes from the DHT network, download and parse torrent files, and store them in a database. It consists of four primary roles:

    • worker: Crawlers that collect resource infohashes. Multiple worker processes can be started to increase efficiency.
    • male: Downloads torrent files based on the collected infohashes.
    • female: Parses torrent files and records them into the database.
    • queen: An entry point used to manage and start workers, males, and females via PM2.
    # Example: Start a worker on port 3000
    node startup worker 3000
    
    # Example: Start a male process with ID 1
    node startup male 1
  5. Understand the performance impact of Server Side Rendering (SSR) vs CSR

    SSR improves the Largest Contentful Paint (LCP) by sending fully rendered HTML to the client, reducing the 'white screen' time compared to Single Page Applications (SPA/CSR). However, SSR can negatively impact First Input Delay (FID) because the browser may be busy executing JavaScript and hydrating the page when the user first attempts to interact with it. While CSR has a slower initial load, its initialization tasks are often more distributed across asynchronous tasks, potentially avoiding 'Long Tasks' that block the main thread.
  6. Implement Streaming HTML with React 18 Suspense SSR

    React 18 introduces a Suspense SSR Architecture that decouples the rendering of different page sections. By wrapping slow-loading components in <Suspense>, the server can immediately send the core HTML and fallback skeletons. As the data for the suspended components resolves, the server streams the remaining HTML and scripts to the client, which then inserts them into the correct positions. This prevents a single slow API call from delaying the entire page response.
    const UserInfo = React.lazy(() => import('./UserInfo.js'))
    const Explore = React.lazy(() => import('./Explore.js'))
    
    const App = (
      <Layout>
        {/* Core content rendered immediately via SSR */}
        <VideoPlayer />
    
        {/* Non-core content streamed as it resolves */}
        <Suspense fallback={<UserInfoSkeleton />}>
          <UserInfo />
        </Suspense>
    
        <Suspense fallback={<ExploreSkeleton />}>
          <Explore />
        </Suspense>
      </Layout>
    )
    
  7. Improve SSR performance with React 18 Suspense Architecture

    React 18 introduces a Suspense SSR Architecture to mitigate FID and LCP issues through two primary capabilities:

    1. Streaming HTML: The server responds with HTML as soon as possible. Slower components are streamed as HTML fragments with accompanying scripts that insert the content into the correct position on the client, preventing slow APIs from blocking the entire page load.
    2. Selective Hydration: By combining React.lazy and <Suspense>, components can be hydrated independently. This prevents a single long hydration task from blocking the main thread. Furthermore, React 18 prioritizes hydration based on user interaction; if a user clicks an element in a non-hydrated Suspense block, React prioritizes hydrating that specific block to respond to the event immediately.
    const UserInfo = React.lazy(() => import('./UserInfo.js'))
    const Explore = React.lazy(() => import('./Explore.js'))
    
    const App = (
      <Layout>
        <VideoPlayer />
        <Suspense fallback={<UserInfoSkeleton />}>
          <UserInfo />
        </Suspense>
        <Suspense fallback={<ExploreSkeleton />}>
          <Explore />
        </Suspense>
      </Layout>
    )
    
  8. Choose a framework for Islands Architecture

    Several frameworks provide built-in support for the Islands Architecture pattern:

    • Astro: A static site generator that allows UI components from various frameworks (React, Preact, Svelte, Vue) to be rendered as lightweight static HTML. It provides built-in partial hydration and supports lazy loading of components.
    • Marko: An open-source framework by eBay that combines streaming rendering with automatic partial hydration. It generates optimized code based on whether it is running on the client or server.
    • Eleventy + Preact: A combination where Eleventy (static site generator) is used with isomorphic Preact components. Hydration is controlled declaratively, often using a WithHydration modifier.
  9. Implement convention-based routing in Fresh

    Fresh uses file-system routing where files in the routes/ directory map directly to URL paths. For example, routes/index.tsx maps to / and routes/about/contact.tsx maps to /about/contact.
  10. Configure grunt-contrib-jasmine for automated testing

    The grunt-contrib-jasmine plugin runs Jasmine tests using PhantomJS. It generates an HTML file based on a template (defaulting to DefaultRunner.tmpl), executes the tests within PhantomJS, and then typically deletes the generated HTML file.
    grunt.initConfig({
      jasmine: {
        src: 'src/**/*.js',
        options: {
          specs: 'spec/**/*.js',
        },
      },
    });
  11. Reference for FullCalendar eventResize parameters

    The eventResize callback function accepts the following parameters:

    • event: The Event Object containing information about the current event (e.g., title, start/end times).
    • dayDelta: The number of days the event was resized by (can be negative).
    • minuteDelta: The number of minutes the event was resized by (can be negative). This is primarily effective in the week view; in other views, it is typically 0.
    • revertFunc: A function that, when called, reverts the event to its original duration/time before the resize occurred.
    • jsEvent: The native JavaScript event object containing mouse coordinates and other browser-level event data.
    • ui: The jQuery UI object.
    • view: The current View Object.
  12. Understand Islands Architecture concepts

    Islands Architecture is a design pattern for Server-Side Rendering (SSR) that encourages the use of small, focused interactive code blocks called 'islands'. Unlike Single Page Applications (SPAs) that render the entire page on the client, Islands Architecture delivers a page primarily as static HTML with multiple independent entry points for interactivity.

    Key characteristics include:

    • Static Regions: Non-interactive pure HTML that requires no hydration and no JavaScript.
    • Dynamic Islands: Isolated components that contain both server-rendered HTML and the necessary JavaScript to hydrate and become interactive on the client.
    • Independent Hydration: Each island's hydration script is executed asynchronously and independently. A performance issue in one component does not block the hydration of others.
    • Progressive Enhancement: The output is fundamentally HTML, which is then enhanced with specific interactive behaviors.