ActionButton | Action button is a Floating Action Button | Continous Integration library

I'm doing a project on Shiny where there are several drop-down menus. The options contained in the menus are stored in a data frame and when running the app you have the option to add more data to the data frame. The behavior I expected was that the options in the drop-down menu would automatically update with changes in the data frame, but this doesn't happen.

Is this possible to be done in Shiny? If yes, how?

Here's a code with an example of how I'm doing.

I'm trying to save and load state of a shiny app using bookmarks. However, it doesn't work and I wonder whether it is because of inserting dynamic UI. If there are other ways to save and load dynamically rendered ui and resulting output, that would be great too. I don't know where to start and this is as far as I could come.

Simple example

When running the first "almost MWE" code immediately below, which uses conditional panels and a "renderUI" function in the server section, it only runs correctly when I comment out the 3rd line from the bottom, observeEvent(vector.final(periods(),yield_input()),{yield_vector.R <<- unique(vector.final(periods(),yield_input()))}). If I run the code with this line activated, it crashes and I get the error message Error in [: subscript out of bounds which per my research means it is trying to access an array out of its boundary.

I have an app such that after a user has selected input in tab 1, the app will redirect the user to tab 2, where a plot is generated based on the input selected in tab 1. I added suspendWhenHidden = FALSE so that the plot will be generated before the user is redirected to tab 2. However, when I added the following line of code, outputOptions(output, "mtcarsplot", suspendWhenHidden = FALSE), the console shows a warning.

Can anyone explain/solve the error in the code? Thanks for the help. I have added the code and then the warning message below.

the app's code (MWE):

I am creating a shiny app and part of its purpose is to allow the user to upload a CSV and be able to select column/variables of interest. So far, I have successfully managed to upload a file, but the reactive part to select columns does not work, that is when I click on 'incorporate external information' nothing happens. I used this answer for guidance. How can I allow the user to select the columns and then display them accordingly? The purpose of column selection is to then allow the user to perform regression analysis on selected columns.

I am creating a shiny app to allow the user to upload a CSV, select a dependent and independent variable(s) and then perform a regression analysis. So far I have been able to upload the file, and select the columns of interest based on this answer. But the app is not being able to construct the lm model. The purpose is to first generate and display lm results by using the summary and then produce some plots. How can I allow the user to perform a simple regression analysis? The sample file can be downloaded from here.

UI

I'm trying to create multiple plots using modules, each plot with it's own input. But when I tried to run the app, only the inputs are added each time I add using insertUI and the plot output is blank.

I've tried connecting the ui and the server modules with the same id ("hist1") but it doesn't seem to connect each individual module.

I am making a shiny app that allows the user to upload a CSV, then select the independent and dependent variables. Right now I am able to upload a file, select variables and run regression analysis. But, I am stuck at the step where I would pass the lm object to autoplot then making it interactive via autoplotly in a new tab. How can I create interactive regression plots via using user selected variables in a shiny app?

UI

I've reviewed similar posts and haven´t found any that address this specific need. Below is very simple MWE of what I'm trying to do: shown in 2 images, and in runnable code. My "Hide" button (or remove UI) doesn't work. Help!! I'm sure it's a simple solution but I'm new to this.

What I'm trying to do: Click on the "Add" button and a file input prompt appears below. Click "Hide" button and the file input prompt goes away. Click "Add" again (after "Hide") and the file input prompt appears again. If you click "Add" now (and repeatedly), that single file input prompt remains. (Most other posts have the object appearing repeatedly, again and again in a growing column, with every additional click of the button - this isn't what I need). Just one click to make it appear (and clicking "Add" over and over just keeps it there in its original single manifestation), and "Hide" makes it go away. Simple as that.

Images: