Instead, the current design is geared toward distinct “filter controls” for input and “filtered visualizations” for output. While linked brushing only lets you have an active selection on one widget at a time, you can have multiple active filters and Crosstalk will combine the filters by intersection. July 28, 2019 incrosstalk, flexdashboard. Now the more difficult part: actually implementing the linked interactions on the JavaScript side. When you select a bunch of data points in Crosstalk, each data point is considered a row (or observation), and row IDs are broadcast to the rest of the Crosstalk group. In the following example, we’ll use three filter inputs to control two plots. each call to renderValue) should create a new crosstalk.SelectionHandle instance. (To add a widget, please submit a PR with modifications to this page.). Visualizations that aggregate or summarize rows—for example, grouping rows by a categorical variable and showing the averages in a bar chart—will have a harder time. Click and drag to brush data points in the above plots; noticed that their brushing states are linked. Leaflet lets you easily generate interactive maps using R. It is a wrapper for the very popular Leaflet JavaScript library by Vladamir Agafonkin. If you created a separated SharedData object for each plot, even with the same underlying data frame, the plots would not be linked. Note that it doesn’t matter which handle you call filteredKeys on. You can do this using the value property. This doesn’t mean that the data and keys need to be identical across SharedData instances in the group, but rather, that any overlapping key values must refer to the same data point or observation; and conversely, that related data points/observations in different SharedData instances must use identical keys. But we do have both scatter and sel_handle objects at this point, so we can wire them together. The R binding is the R function that constructs an instance of your widget (usually it is named after your widget). Am minimal example can be just two lines of additional code which results in a UI slider connected to the date field and a leaflet map. If you’ve used SQL databases, you can think of these as primary keys, except that their type must be character vector (whereas databases more often use integer values as keys). The sections below will discuss the types of interactions that are expected from each Crosstalk-compatible widget, and how to use Crosstalk’s JavaScript APIs to communicate. The d3scatter object has a "brush" event that we can use to update the Crosstalk selection handle, and the Crosstalk selection handle has a "change" event we can use to highlight the d3scatter data points appropriately. The fully selection-enabled binding code is here: In your widget’s R function, modify the call to. With Crosstalk’s filtering API, multiple widgets simultaneously contribute to the current “filter set”. To tell if Crosstalk is enabled for the current renderValue invocation, test one of these values for truthiness. I’ll assume you already take a data frame as an argument. It’s critical that all SharedData instances in a group refer conceptually to the same data points, and share the same keys. The set method changes the value and automatically triggers any change event listeners. if the user has zoomed in on one part of the widget, or repositioned some nodes in a network graph, those aspects should not be affected by selecting or filtering). Crosstalk makes it easy to link multiple (Crosstalk-compatible) HTML widgets within an R Markdown page or Shiny app. The first is key, which is one of the central concepts of Crosstalk. This is easy if the underlying JavaScript library has already provided these facilities for you, but if not, it can be quite tricky to implement. Even though there are three distinct SharedData objects, the plots are linked because the group names are identical. Crosstalk widgets need to support highlighting/fading (or emphasizing/de-emphasizing through other means) of data points to support linked brushing, and they need to support hiding/showing to support filtering. Ideally, each Crosstalk widget would not only highlight/fade to reflect selections made on linked widgets, but also allow you to make a selection directly on the widget itself. It must be the same length as the data. If you’re the author of an htmlwidget package and would like to add Crosstalk support to your widget, this document will help you get started. See the ?rgl::rglShared help topic for details of crosstalk usage. Before you begin, know that not all HTML widgets are good candidates for integration with Crosstalk. This example happens to pass the entire data frame to createWidget. Without all that information, there’s no way to partially highlight a bar based on a set of points that were brushed in a linked scatter plot, for example. Every SharedData instance belongs to a group. Each Crosstalk-enabled visualization instance (i.e.
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