vegan | R package for community ecologists: popular ordination methods, ecological null models & diversity a | Development Tools library

try stopping the event propagation (add a listener, or include it within your other action for that button):

Yes, looks to be a scoping issue. I think the key is to update the formula's environment inside the function:

One way to do it is to replace all with text. For example:

It's not exactly the same, but I think it's pretty close.

I brought the varespec data into Python for this. Then tried to mimic the actions that the vegan package (and your code) took. Along those lines, I stuck to the object names you used (for the most part).

There has to be an easier way to do this.

veganCovEllipse is not an exported function. This means that it is not intended for interactive use, but it is a support function only to be called from other functions in vegan. Therefore it is not documented. However, the answer is simple: it can calculate any kind of ellipse depending on the input. In vegan the function is called for instance from ordiellipse and there it can draw standard error ellipses, "confidence" ellipses (standard error multiplied by some value picked from statistical distribution), standard deviation ellipses, standard deviation ellipses multiplied by similar constants as standard errors, or enclosing ellipses that contain all points of a group, depending on the input to the function. In showvarparts function it is just re-used to draw circles. Actually veganCovEllipse does not fit anything: it just calculates the coordinates to draw what you asked it to draw, and your input defines the shape, size, orientation and location of the ellipse coordinates.

There are other functions in other packages that do the same: return you the points needed to plot an ellipse from your input data. For instance, the standard (recommended) package cluster makes similar calculations in non-exported functions cluster:::ellipsoidPoints with effectively the same mathematics, but in completely different way. This function is non-exported as well, and it is intended to be called from user function cluster::predict.ellipsoid. The vegan implementation is similar as in the ellipse function in the car package, where these calculations are embedded in that function and cannot be called separately from car::ellipse.

You could use json module to parse content of script tags, which is accessible by .text field

Here is the example of parsing all script jsons and printing name:

I believe the issue is that you are not adding the result in the Model which is being used to render the page show_dish_List.html, therefore nothing is being populated in the UI. Your UI is expecting the data to be in listDishSearch and there is nothing in that variable.

Update your code to:

You need to do reqDiet = getCheckboxValues(document.getElementById('form_id'))

The function expects a DOM Node and not a string, hence you're getting that error.