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I have an assignment where I have to create a webpage with multiple pictures and when you click the pictures, the alt text displays on the webpage. Part of this assignment is to avoid using similar code repeatedly in JS and to use addEventListener. It was suggested that a loop can be used but I don't quite understand how. Here is the code I have below. The repeating functions are what I would like to avoid if possible. I have to use pure JS, no JQuery.

HTML:

I'm working on a Shiny app and I need some help.

I have a dataframe (loaded from a file). I want the user to be able to extract the rows for which a specific regex appears in a specific column of that dataframe. Let me rephrase: I want the user to select a column from the database and to search for values inside that specific column.

Let me show you an example.

• the user selects the column "Nutrient"

• the user types the world "iron"

Result: the function returns all lines in which the column "nutrient" contains "iron".

With a fixed column, that's easy: you just use grepl and extract all the rows that contain the expression you want. But I can't manage to make it work with a specific column. I have looked at countless questions and answer but none of them take the two inputs (patter and column).

This is my dataframe:

I am using read.csv on a datapath. It returns a dataframe. I want to be able to get a single value in this dataframe, but instead I get a list of values displaying the levels.

I have tried several ways to access the value I want. In the next part, I will show you what I tried and the results I got.

Here is my simple dataframe:

I am new to Android and are working on an app to show the communication between two fragments in a single activity. When I click on an item from a customed listview in the first fragment, the view in the second fragment change in the runtime.

I am writing a script that reads a csv file to a psql table and then sorts the data and exports it to a new file. How do I print the same data that is exported to the csv files, to the terminal to display it like a table?

Here is the code I have:

I am trying to wrap my head around debounce. I have attempted to insert it into the chain of reactive functions seen in the code below but to no avail. I am trying to figure out how to make the plot refresh only after the invalidation sequence has stopped updating.

Where and how do I use debounce?

I am struggling to solve an issue with passing multiple filters in a row, and sometimes the result is not as expected. In the example below, there are 7 Deer, 2 Bears, 1 Cougar, 1 Beaver, 1 Skunk, 1 Moose, and 3 Elk. When you select one or more species, sometimes the number of rows passed through the filters is not the same as it should be.

Eg. When I select Bear, Beaver, and Cougar, it should produce data set of 4 rows, however, in the textoutput displaying the number of rows, nrow=3 is displayed. Adding in more selections sometimes passes the remaining filters, sometimes not. Sometimes when selecting Deer, where you would expect 7 rows of data, only 3 are passed.

Have a look at the reproducible example below.

Server:

I am running into a very strange behavior using STRING_AGG and using the expression inside the delimiter. The results are offset (ie the next iteration is shown where the delimiter would go).

I have a column which contains neighborhood names and I am trying to join them together into a string to later use in another query since there are a lot of them and I need to do this dynamically. I've dumbed down the query to the bare essentials and I'm still getting the offset result.

example query:

I have an array with repeating values: