This is a simple example of resizing {bslib} cards for a dashboard. A card can be made resizable (vertical, horizontal or both) by using the resize property. In order to use this in a {bslib} dashboard it can be added using tags$style or included in bs_theme(). Adding the resize-vertical class adds a resize anchor to …

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R has several object-oriented systems and I'm a big fan of R6. Detailed below is a specific use-case. I wanted a parent class that held a list of child classes with thet specification that the child class instances could update the parent class instance. Parent Class The parent class is shown below along with a table …

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Plotly charts can be enhanced with custom controls. One use of controls is to update an existing chart. This post will show how to add a couple of buttons to a chart, toggling error bars on and off. It should be noted that coloring by group affects the order (and hence validity) of error bars in a Plotly plot so a …

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Quarto has many improvements over RMarkdown, plus a couple of limitations, one being that you cannot pass R objects as parameters to a Quarto document in the way the RMarkdown would accept them. Quarto receives parameters serialized as yaml, so only text, numeric, boolean (received as TRUE="yes" and …

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The {sortable} package {sortable} is an incredibly useful R package built upon the sortbale.js javascript library, allowing drag-and-drop features to be incorporated into shiny apps. The package works with two types of sortable lists: rank list: items can be sorted within a list bucket list: a single object containing …

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Serverless Shiny Inspired by Max Kuhn's presentation at R/Pharma today I tried out embedding shiny a app within a Quarto website and hosting it on GitHub pages. The app itself is a chemistry quiz built to help my son who had a school test coming up. By running it within a Quarto website it's available for him to use on …

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Shiny textInput label This is just a short post highlighing how you can move a textInput label so that it is within the textbox textInput box itself. This is a style that can be used when you have multiple textInputs and wish to preserve screen height. First we define a css class to reduce the size of the label text …

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SelectizeInput SelectizeInput is a powerful shiny widget built on the selectize.js library. The behavior of selectize.js can be extended using plugins, which are available in the shiny::selectizeInput() functon. One particularly useful plugin is "drag_drop" which allows a user to re-order the items selected …

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Why package a plumber API? There are many advantages to building R-based code as a package. You can use the DESCRIPTION file to store metadata related to the API, separate functions from endpoints in the R/ folder, include documentation and run tests. In this example we'll build a simple plumber API as a package. The …

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Metadata can be included in the yaml header of an RMarkdown document. The yaml can store metadata in the params parameter or as individual yaml parameters. For example, the RMarkdown file below adds some metadata parameters to the header: short_title, reference and meta_list. The rmarkdown function rmarkdown::metadata …

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