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Async Vue.js Components with loading indicator

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Async Vue.js Components with loading indicator

Vue.js has asynchronous components. You can use them to show a loading indicator while the real component is prepared.

This talk guides you through the benefits and caveats.

Alexander Schwartz

May 06, 2019
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  1. .consulting .solutions .partnership
    Async Vue.js Components
    with loading indicator and error handler
    Alexander Schwartz, Principal IT Consultant
    Vue.js Frankfurt Meetup, 2019-05-06

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  2. Async Vue.js Components with loading indicator and error handler
    © msg | May 2019 | Async Vue.js Components | Alexander Schwartz 2
    Idea and Concept
    1
    Live Demo
    2
    Benefits and Caveats
    3

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  3. Idea and Concept
    Idea and Concept
    © msg | May 2019 | Async Vue.js Components | Alexander Schwartz 3
    Problem 1: Your application is big and starts slow in the browser
    Solution 1: Use Webpack code splitting to load components only when
    needed
    Problem 2: When the user visits the part of the application for the first
    time, there is a delay, and loading might fail
    Solution 2: Show a placeholder while loading, and an error message if
    loading fails

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  4. Vue.component(
    'async-webpack-example',
    // The `import` function
    // returns a Promise.
    () => import('./MyComponent.vue')
    )
    Idea and Concept
    1. https://vuejs.org/v2/guide/components-dynamic-async.html
    Async Components Step 1
    © msg | May 2019 | Async Vue.js Components | Alexander Schwartz 4
    • Webpack will split the code, and load the chunk
    from the server as needed
    • Vue.js will create the component when it is first
    used
    Still missing: Error handling, load indicator

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  5. const AsyncComponent = () => ({
    component: import('./MyComponent.vue'),
    loading: LoadingComponent,
    error: ErrorComponent,
    // for loading component. Default 200ms
    delay: 100,
    // for error component. Default Infinity
    timeout: 3000
    })
    Vue.component(
    'async-webpack-example',
    AsyncComponent
    )
    Idea and Concept
    1. https://vuejs.org/v2/guide/components-dynamic-async.html
    Async Components Step 2
    © msg | May 2019 | Async Vue.js Components | Alexander Schwartz 5
    • Vue.js will set timeouts for the alternative
    components

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  6. Async Vue.js Components with loading indicator and error handler
    © msg | May 2019 | Async Vue.js Components | Alexander Schwartz 6
    Idea and Concept
    1
    Live Demo
    2
    Benefits and Caveats
    3

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  7. Live Demo
    © msg | May 2019 | Async Vue.js Components | Alexander Schwartz 7
    Source:
    https://github.com/ahus1/vue-async-timeout
    DEMO

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  8. Async Vue.js Components with loading indicator and error handler
    © msg | May 2019 | Async Vue.js Components | Alexander Schwartz 8
    Idea and Concept
    1
    Live Demo
    2
    Benefits and Caveats
    3

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  9. Benefits and Caveats
    Benefits and Caveats
    © msg | May 2019 | Async Vue.js Components | Alexander Schwartz 9
    Situation Behaviour Remedy
    Component loads fast or
    already loaded, delay set to 0
    Flickering Increase delay

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  10. Benefits and Caveats
    Benefits and Caveats
    © msg | May 2019 | Async Vue.js Components | Alexander Schwartz 10
    Situation Behaviour Remedy
    Component loads fast or
    already loaded, delay set to 0
    Flickering Increase delay
    Component loads slowly Loading screen appears after delay,
    then the component
    (works as designed)

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  11. Benefits and Caveats
    Benefits and Caveats
    © msg | May 2019 | Async Vue.js Components | Alexander Schwartz 11
    Situation Behaviour Remedy
    Component loads fast or
    already loaded, delay set to 0
    Flickering Increase delay
    Component loads slowly Loading screen appears after delay,
    then the component
    (works as designed)
    Component fails to load after
    for example network error
    Error component shows; no retry will
    be issued on next rendering
    Provide link to user to reload
    application OR re-register
    component
    Vue.component("comp", c)

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  12. Benefits and Caveats
    Benefits and Caveats
    © msg | May 2019 | Async Vue.js Components | Alexander Schwartz 12
    Situation Behaviour Remedy
    Component loads fast or
    already loaded, delay set to 0
    Flickering Increase delay
    Component loads slowly Loading screen appears after delay,
    then the component
    (works as designed)
    Component fails to load after
    for example network error
    Error component shows; no retry will
    be issued on next rendering
    Provide link to user to reload
    application OR re-register
    component
    Vue.component("comp", c)
    Timeout exceeded loading
    component
    Error component shows; late
    response will be ignored; no retry
    will be issued
    Don’t specify timeout OR re-
    register component as above

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  13. Benefits and Caveats
    Benefits and Caveats
    © msg | May 2019 | Async Vue.js Components | Alexander Schwartz 13
    Situation Behaviour Remedy
    Component loads fast or
    already loaded, delay set to 0
    Flickering Increase delay
    Component loads slowly Loading screen appears after delay,
    then the component
    (works as designed)
    Component fails to load after
    for example network error
    Error component shows; no retry will
    be issued on next rendering
    Provide link to user to reload
    application OR re-register
    component
    Vue.component("comp", c)
    Timeout exceeded loading
    component
    Error component shows; late
    response will be ignored; no retry
    will be issued
    Don’t specify timeout OR re-
    register component as above

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  14. Benefits and Caveats
    Further Reading
    © msg | May 2019 | Async Vue.js Components | Alexander Schwartz 14
    Vue.js dynamic and async components
    https://vuejs.org/v2/guide/components-dynamic-async.html
    Lazy Loading with Vue Router
    https://router.vuejs.org/guide/advanced/lazy-loading.html
    Example by @chrisfritz – see lazyLoadView() at end of file
    https://github.com/chrisvfritz/vue-enterprise-boilerplate/blob/master/src/router/routes.js
    @ahus1de

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  15. .consulting .solutions .partnership
    Alexander Schwartz
    Principal IT Consultant
    +49 171 5625767
    [email protected]
    msg systems ag
    Mergenthalerallee 73-75, 65760 Eschborn
    Deutschland
    www.msg.group

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