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Understanding QML Javascript for Web Developers

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Sathya Prasad edited this page Mar 23, 2016 · 1 revision

Refer to these links first its an excellent read :

Few points to note:

  • There is no window or document object
  • No global properties can be defined: all variables and functions must be locally defined, and belong to their local scope
  • Due to the different environments, JavaScript frameworks intended for the Web are usually not compatible with QML
  • The setTimeout() and setInterval() JavaScript functions are not supported: use Timer elements instead
  • The XMLHttpRequest object is supported, and can be used to retrieve data from the network. There is no cross-domain issue. However AppFramework provides NetworkObject which is much richer and easy to use.
  • JavaScript code cannot modify the global object. In QML, the global object is constant - existing properties cannot be modified or deleted, and no new properties may be created.
  • Javascript patterns such as "Promises" or "Callbacks" can be re-created in QML since these were provided by third-party libraries.

Good References:

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