Waterfall spectrogram using js library - javascript

I would like to add a waterfall spectrogram to my web page and I didn't find the proper js library to fit my needs.
Do you have some suggestions to implement this task?
Is it possible to use js only? Or do I have to "touch" the backend as well?
I need something like this :

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Dynamically Saving Images to a PDF template

I'm building a website where people can pick several pictures from a range.
I then want the users to be able to create a PDF using those pictures. However I want those pictures inserted in predefined positions and sizes in a template I have already created which will contain other predone materials (words pictures etc).
So my question :
its possible ?
Can anyone recommend a library which will satisfy my needs, I have had a look and I cant see any PDF libraries that seem to mention templates
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Yes, this is completely possible.
I would recommend using wkhtmltopdf to generate the pdfs from an html template.
Another handy library for this kind of work is image.intervention
Both of these would work with PHP.
If you're working in javaScript you may want to use PDFKit
Edited: Only if you use php.
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Does anyone know how to include external JavaScript libraries from within a Dashing widget's code?
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I want to implement a cordova packaged app in javascript and use c-code for some high performance operations.
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I want to implement multiple files selection for File Upload in RichFace, and I found a demo here.
But if I can implement multiple files selection like we can do that on Windows normally, it will be a good experience for users.
If this is not support in RichFace, how can I implment a custom tag for this using javascript?
Could you comment out your idea and suggestions?
It seems like this issue was fixed in RichFaces v4.5.0.Alpha1: https://issues.jboss.org/browse/RF-12224
But currently available version of RichFaces is 4.3.4.Final, so this feature is not yet available.

CSS/JavaScript manager for django

Is there a CSS and/or JavaScript manager module for django?
What I am looking for in functionality:
I would like to be able to define which stylesheets and javascript files to load, on a per view basis (this by itself is easy to do in bare django, but bear with me...)
I would like the plugin to automatically combine/optimize the "source" CSS/JS and insert the output into the appropriate view.
Does something like that exist?
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