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Editorial Team
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Asked: 2026-06-18T16:34:05+00:00

Premise: A complete Sencha touch/Js noob with a Java background – (5 days) Is

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Premise: A complete Sencha touch/Js noob with a Java background – (5 days)

Is it possible to use HTML5 web workers with Sencha Touch? The scenario I have is, I have an app made with Sencha Touch 2 and packaged with phone gap and in one of the scenarios, on clicking a button a controller makes an API call which renders the UI inactive for a little bit – I would ideally like to move this to a secondary thread and keep the UI as responsive as possible, but since JS is single threaded I want to leverage HTML5 webworkers for Sencha touch . I found this plugin but can I use this with Sencha Touch 2 ? If not what are the other options I have. Mind you this is for mobile/tablet dev with Sencha touch and not extJS for desktops.

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1 Answer

  1. Editorial Team

    What I’ve understood from your question is that you want to use webworkers to render UIs, right?
    I think it’s impossible because the scope of webworkers is very limited. Here’s the list of things that webworkers can access:

    • The navigator object
    • The location object (read-only)
    • XMLHttpRequest
    • setTimeout()/clearTimeout() and setInterval()/clearInterval()
    • The Application Cache
    • Importing external scripts using the importScripts() method
    • Spawning other web workers

    And this is the list of things that webworkers can’t access:

    • The DOM (it’s not thread-safe)
    • The window object
    • The document object
    • The parent object

    Follows a list of webworkers use cases:

    • Prefetching and/or caching data for later use
    • Code syntax highlighting or other real-time text formatting
    • Spell checker
    • Analyzing video or audio data
    • Background I/O or polling of webservices
    • Processing large arrays or humungous JSON responses
    • Image filtering in
    • Updating many rows of a local web database

    For more informations about webworkers and their enviroment: http://www.html5rocks.com/en/tutorials/workers/basics/

    Talking about my extension: I don’t think it goes well for Sencha because it uses Ext structures and classes.

    In the end, I don’t know any Sencha UX for webworkers.

    UPDATE (2013/03/20)

    ExtJS-WebWorker now works for Sencha Touch too!

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