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来自 Johns Hopkins University 的课程

Developing Data Products

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Johns Hopkins University

Developing Data Products

1616 个评分

课程 9（共 10 门，Specialization Data Science）

A data product is the production output from a statistical analysis. Data products automate complex analysis tasks or use technology to expand the utility of a data informed model, algorithm or inference. This course covers the basics of creating data products using Shiny, R packages, and interactive graphics. The course will focus on the statistical fundamentals of creating a data product that can be used to tell a story about data to a mass audience.

从本节课中

Shiny, GoogleVis, and Plotly

Now we can turn to the first substantive lessons. In this module, you'll learn how to develop basic applications and interactive graphics in shiny, compose interactive HTML graphics with GoogleVis, and prepare data visualizations with Plotly.

与讲师见面

Brian Caffo, PhD
Professor, Biostatistics
Bloomberg School of Public Health
Jeff Leek, PhD
Associate Professor, Biostatistics
Bloomberg School of Public Health
Roger D. Peng, PhD
Associate Professor, Biostatistics
Bloomberg School of Public Health

So, let's just go over now a couple of different ways we can tweak the UI for

shiny.

You already have kind of a default theme with the side bar panel.

Let's go over one with the tab and I think once you've gone through these two

versions, you'll kind of notice the patterns and

you'll be able to tweak it with a lot of different settings.

Also we'll talk a little bit at the end about how you can actually do

Shiny with a custom HTML function.

Okay, so let’s just go through this Advanced UI example and at the end,

we'll have some final discussion.

Okay, so I copied the code from the R marked down document.

Hopefully the first couple of lines are very familiar to you at this point.

We're still going to have a side bar layout and you can do tabs within

a single panel, just with no side bar, just the tabs.

You just need to change the layout.

So you can have a different layout with tabs but we're going to have a side bar

layout where the side bar is going to have the inputs and

then the main panel is going to have tabs.

But you can also just have one big panel, not with a side bar, and

have it have tabs.

Or as we'll talk about later you can tweak the UI infinitely with custom HTML.

Okay so our sidebar panel is just going to have three text input boxes and

the labels for those inputs are going to be box one, box two, box three.

The prompts to the user are going to be enter tab one text, enter tab two text,

enter tab three text.

And then the starting value is going to be Tab 1, Tab 2 and Tab 3.

Okay now in the main panel we are going to have a subset of the main panel,

called a tabset panel.

And this is kind of this nested user-interface-structured

that shiny allows with it's with a syntax here.

So we have a mainPanel, and then we have a tabsetPanel inside that function, okay?

And type = "tabs", and then we have three tabPanels.

And these tabPanel statements are working just like our mainPanel and

sidebarPanel functions.

They work in the same way.

We just have them strung out into one line because they're very short in this case.

So our tabPanel is going to have a label that says Tab 1.

It's going to have, basically, a character term, to go down a line.

And then it's going to have textOutput, out1.

So it's going to be looking for out1 from the sever.R function, textOutput, out2.

Again, it's going to be looking for

something labeled output$out2 from the server, Server.ourfile and so on.

Okay, so now let's look at our server.

Okay, it's going to be a very simple one, shinyServer(function(input, output) so

this should all be very familiar.

Okay, and there's our output$out1 and it's going to be renderText.

Okay, because remember what we want to do in this piece when we go back to the UI we

want to display the text, and we're just going to do nothing.

We' re just going to Spit back out whatever the person entered in box1,

box2 and box3.

So let's go ahead and run that.

All right, so here's our three text boxes for entering text.

And here's our three tabs.

So let's put it in tab two.

So if I just put it enter new text, okay, and I go to Tab 2, it says enter new text.

Okay so that's just a nice little tweak of the UI and

hopefully as you're doing it, you're starting to get a sense of the syntax and

how it works a little bit better.

Make sure when you're doing all your UI tweaks in everything that you don't have

any errors in the r code, or studio will give you a little X's in

the code if you've forgotten to come or something like that.

And I think that's probably the biggest challenge with the UI programming, and

R is making sure you've closed all your parenthesis and

added all the necessary commas and that sort of thing.

And I think proper indentation and doing your

coding in a nice environment like RStudio will really help that tremendously.

Okay, so your homework now is to develop a tabbed user interface for Shiny

and just next we're going to go through just some of our final comments on Shiny.

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