epub.js
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Total pages and redirect to a specific page
I can´t find a way to get the total pages of a whole epub file, let alone redirect to a specific page. I know that this depends on the epub's chapters and his rendition (with his size letter and others settings) but there should be a way to calculate it.
To get the total number of pages use: this.book.locations.length() This is not exactly pages, this is the number of locations calculated at the beginning (by default every 600 characters). To jump to specific page use this.book.locations.cfiFromLocation(pageNumber) This will return the CFI of the page. To actually jump use: this.display(cfi);
I hope this helps.
-- Ori Idan CEO Helicon Books http://www.heliconbooks.com
On Tue, Feb 22, 2022 at 4:17 PM Aldo @.***> wrote:
I can´t find a way to get the total pages of a whole epub file, let alone redirect to a specific page. I know that this depends on the epub's chapters and his rendition (with his size letter and others settings) but there should be a way to calculate it.
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Another way to get total Page
- Hiddenly render every chapter.
- Sum up the value of
rendition.location.start.displayed.totalof each chapter - Total summation is the total page by rendition format.
- Finally destroy hidden Rendition and elements.
@OriIdan this.book.locations.cfiFromLocation(pageNumber) always return -1, what can be the reason?
Make sure you have locations. Locations should be calculated at first opening.
On Sat, Mar 5, 2022 at 5:36 PM Erdogan @.***> wrote:
@OriIdan https://github.com/OriIdan this.book.locations.cfiFromLocation(pageNumber) always return -1, what can be the reason?
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Use: this.book.locations.generate(600); You should call locations.generate when you open the book, you can also save the result. The result is an array of objects. In this example it will create a "page" every 600 characters. It does not affect the actual paging according to font size and screen size.
On Sat, Mar 5, 2022 at 5:52 PM Erdogan @.***> wrote:
@OriIdan https://github.com/OriIdan thanks for your answer. How can I calculate it at first, could you share a sample, please?
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@OriIdan yes its returning now! but unfortunately not accurate with loc.start.displayed.page value.
If I enter the page number as 10, it navigated to page 6.
Another way to get total Page
- Hiddenly render every chapter.
- Sum up the value of
rendition.location.start.displayed.totalof each chapter- Total summation is the total page by rendition format.
- Finally destroy hidden Rendition and elements.
This work for me. But it's to slowly.. Any way to get every chapter faster? @RatulSikder97