![]() Most large visualisation libraries will therefore allow bundling those dependencies in separate files. Dependencies can significantly affect the load time of the output (be it a standalone visualisation, an R markdown document, or a Shiny application) as these files may be large. yml file will likely be necessary for every widget it has one drawback: all dependencies listed in the file are always included with the output. Thus far, this book has only covered one of two ways dependencies can be included in htmlwidgets. ![]() Any variable declared as shown below will be accessible by all functions declared in the factory renderValue, but also resize and others yet to be added. This was, in fact, indicated from the onset by the following comment: // TODO: define shared variables for this instance (generated by htmlwidgets::scaffoldWidget). The controller variable has to be declared outside of the renderValue function, inside the factory. To make it accessible outside of renderValue requires a tiny but consequential change without which resizing the widget will not be doable, for instance. This will generally involve the JavaScript instance of the visualisation, the object named controller in the gio package, which, being defined in the renderValue function, is not accessible outside of it. Indeed we are about to discover how to manipulate the widget further changing the data, resizing, and more. Up until now, the topic of shared variables had been omitted as it was not relevant. 15.4.6 Subscribe and Unsubscribe Inputs.
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