In this web application you can load a PDF, of which you can then navigate through the pages. You can also zoom in, zoom out and rotate pages if needed. The real goal of this site is to be able to highlight a specific part of a page while obscuring the rest, making it easier to keep track of the highlighted part of the page.
I'm not sure for what other purposes this can be useful, but I made this with knitting patterns in mind. Using this web page you can highlight a specific line from a knitting pattern, making it easy to keep track of what you're doing. In case you're wondering why I would make such a program: my wife loves knitting, and I love my wife.
To be able to do anything, you must first load the PDF file that you
want to view. When you press the Open PDF
button, you'll see a
small window appear in which you can choose one of two possibilities:
Load a Dropbox share: choose this option if you have a PDF file on your Dropbox account that you want to use. In another browser window, you'll need to log into your account on the Dropbox web page. If you right click the PDF file you'll see the option to share the file and that should provide you with a link that looks like
https://www.dropbox.com/s/XXXXXXXXXXXXXX/file.pdf
It is this link that can be used in the Enter URL
box of the high-lite
web application.
After you've opened the high-lite web page, everything happens in your browser, on your computer. There's no further communication with any of my own web services. When you want to download a PDF file into the web application, some JavaScript program code is executed to download a the specified URL into the web application. But downloading something into this application is somewhat different than just opening an URL in your browser, there are certain restrictions. The web server you're downloading the data from has to indicate that it allows the use of this data in the web application.
Most web servers do not allow just any web application to download data, but Dropbox does. For this reason I've currently limited the URLs you can specify to Dropbox URLs. While the web application in principle could allow you to specify any URL, because of the mentioned download limitation in a web application, you'd just be confronted with error messages for almost any other URL you'd specify.
Once you have opened a PDF, you should see the first page. There are several things you can do now:
<<<
and >>>
you can change the page that's displayed.
On a tablet, you should be able to swipe left or right to change the page.Rotate
button, you can change the rotation of a page in the PDF.Toggle highlight
button, you can enable or disable the highlighting
mode. On a tablet, you can also swipe up or down on the darker part of the page you
can see on the right. It doesn't matter if you swipe up or down, the effect is just to
toggle the highlighting mode. Performing such a toggle will change something like this You can find contact information on my Google+ page.