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onos.ui.addView('viewId', {
preloadinit: preloadinit,
reset: reset,
load: load,
unload: unload,
resize: resize,
theme: theme
}); |
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The second argument to the function is an inline object block with the given keys, whose values are references to view life-cycle callback functions:
| preloadinit | This function is called only once, the first time the view is loaded. It is called after the view's <div> has been added to the DOM. |
| reset | This function is called just before the view is shown. It can be used to clear stale data from the view. |
| load | This function is called when the view is loaded. |
| unload | This function is called when the view is unloaded. The view may use this to drop references to cached data, or stop background tasks. |
| resize | This function is called when the view has been resized. |
| theme | This function is called when the user has toggled the theme. |
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In the first release, the Topology View is the only view available; it is loaded at GUI startup. The following paragraphs summarize each of the view's callbacks:
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Init
The preload init callback is used to initialize the view's SVG layer (including pan and zoom controls) and the Force Layout used to visualize the topology.
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