Chapter-2 | Templating with Jinja2

You need to use method forEach() to work with a collection of classes. And also method closest(), which allows you to refer to the specified parent of the current element.

Try this it code:

I'd suggest to change spider architecture since scrapy isn't supposed to chain spiders(it's possible of course but it's bad practice in general), it's supposed to chain requests within the same spider.

Your problem is caused by the fact that scrapy disigned to grab flat list of items, while you need nested one like book = {'title': ..., 'chapters': [{some chapter data}, ...]}

I'd suggest next architecture for your spider:

Well using Material UI MenuItem didn't work but I was able to use redux form and create a nested drop down that did. This is a screen shot of what I created. It did not have the functionality to open/close a panel but it still gave the user a sense of a nested dropdown.

Here is the code that I changed in the SelectMenu method. The key was to use the native form of the Material UI Select component and the optgroup element.

The button that you are looking for on the page is inside of an iframe. Which means you can not access the information inside of it using selenium. Its my understanding that they previously didn't have an iframe (thats why your code used to work) but then changed to have it (probably to prevent scraping?). So to solve this all you need to do is look for the url of the iframe, open the page, and just look for the button url there. Here is what the code looks like:

After this line:

It causes error, because it can't find the current view context to show the AlertDialog

So what you need to do is replacing val context = applicationContext to

AVRounding is indeed an enum (to be exact, an unscoped enum without a fixed underlying type):

The terminology might be a little off indeed but still applies. Followers are not necessarily assigned to other brokers but they need to change the endpoint to where they are going to send fetch requests. The follower's job is to stay in-sync with the leader, and if the leader has been assigned to a new broker because the old one failed then the followers need to send their fetch requests to the new elected broker. I think that is what reassignment means in the context that you shared.

After few hours of struggles, I finally got that to work. What I needed to do, was to define a helper function map-2, which takes as an input function f, list xs and a "nest-level counter" lvl, so in every deeper section it applies f to every element of the list and saves the nest-level counter. Final function:

There is no need in ColumnDocumentRenderer in your case - that renderer was created for cases when you want to lay out your content in columns in scope of one page and then move on to the next page etc. In your case you are laying out the content in columns that span many pages and that is equivalent to just setting proper margins to the DocumentRenderer instead of passing the columns to ColumnDocumentRenderer.

To switch the renderers ad-hoc you indeed need to tweak their currentArea field and currentPageNumber as well. Please note that the solution below is not guaranteed to work in all complex cases and in all iText versions. This is merely a guideline on how to implement what you need and not a complete solution to all cases.

The helper renderer class we need is very simple - it allows customizing current area: