webshot | 基于phantomjs和nodejs的服务器端截图服务

I would like to include a diagram from diagrammeR in R markdown and render it to PDF.

I installed webshot and phantomJS as discussed in this post but the output is a blank image.

I have a summary regression model I want to put into a table. However, it keeps coming up with an error. Not sure what I am doing wrong here. I have included a reproducible data and steps I have taken below.

I want to create an app where the user can input a link or some text and download the corresponding QR code as a pdf. I have already the fundamental building blocks, but I cannot glue them together. For instance, for the pure QR code generation part

I've been trying to save a flextable as a ggplot, then write it to a PNG for gridding. I've gotten what I need, except that the background of the resulting PNG is grey, like this:

Whereas the plot view of the ggplot looks like I want it to (but low res):

Here is the code I use to produce the images (flexRPOPS is a flextable object):

I have created a gt table and I want to have a row at the bottom of the table with the sum of all the columns. I want to position this so that the row label "total" sits within an existing column (the column catchment in my example) rather than out to the side. How do I do this?

With code below, I'm able to generate formattable table and save it as image:

Please have a look at the reprex at the end of the post. Essentially, I create a very simple ggplot2 visualization inside shiny. When I call ggplotly on it in order to get a plotly interactive visualization, the plot legend which was at the top of the plot, gets shifted to the right. Any idea about how to fix that?

Many thanks!

I am struggling to get this done: I want to display a button in the sidebar of a shiny application (called "download aggregated data") if and only if two conditions are met, namely

(1) I select the "yes" value from the menu under "Show extra button" and

(2) The data selected and shown in the table has at least 20 rows.

Condition (2) is the consequence of selecting "large_chunk" in the "select data chunk" menu, but I want the condition to be based on the output and not on the input. In the real-life app which I am developing I will not know beforehand how many data rows I will select with my filters.

Right now only condition (1) is implemented.

I found something useful here about conditionalPanel and a condition on the server side

Shiny - conditionalPanel - set condition as output from server

but I did not get very far. Any help is appreciated!

This is a follow up question from the good answer provided here:

Stripe effect in formattable(), shadow in light gray every other row. R

is there any way to change the default light gray background for the striped zebra grayish rows? lets say to change them to red or to blue? where should I include this instruction?