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Almost everything in PDF. JS is done asynchronously — from loading the PDF file to loading individual pages to rendering pages.
This means that return from such asynchronous operations have to be handled through callbacks. Now PDF.
JS does not use normal callbacks, it uses Promises. Promises and callbacks do almost the same thing, but Promises helps in writing cleaner code.
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Instead of writing callbacks such as success or error here and there in your code, you just chain the various callbacks involved by a then for success or catch for error. Coming back to PDF. JS, it returns a Promise variable on each asynchronous operation request.
When the asynchronous operation is completed, the Promise involved receives a parameter in the callback function. JS APIs work in this way.
When you include the script files of PDF. This object provides a number of APIs that you can call in your Javscript code.
You can also pass binary data as a parameter. If you have a base encoded data, you can convert it to a binary string through atob function. Note that this function just loads the page, and not renders the page on the screen.
This is not an asynchronous call, so dimensions are returned immediately. Web Workers and PDF. But parsing and rendering PDF is not a simple task.
Place the following code in index. Place the following code in a script tag, below the pdf. The Hello, world! Embrace the awesomeness! PDFJS is a global object which you get when you include pdf. This object is the base object and contains various methods. It is used to fetch the PDF document asynchronously, sending multiple Ajax requests to download document in chunks, which is not only fast but efficient as well.
There are many download examples on this site that use dialogs in both these types of scripts. See AcroDialogs Overview for details. New Action Batch Process in the Download Library Inserts a blank page after the first page if the number of pages are even.
And here is a handy script for adding a "Console Window" menu item to the "View" menu in Reader. In fact, zooming is quite straightforward and we just need to update the scale value.
The advantage to using the Console Window is to make this information available to copy to the system clipboard for use with another script in Acrobat or for something else. Acrobat will create a new, blank PDF document.
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