Adding traditional codes to app inventor apps

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FAQ Section: JavaScript Stunts

WebViewer Reference - MIT Audio File (mp3) Duration with Javascript - @TimAI2 Create Buttons in WebViewer By Code - Juan Antonio Dynamic Expression evaluation - Akshay Dynamic Expression Evaluation via eval() - Kevinkun How to fill out a form of a webpage and click a button using some JavaScript - Taifun HOWTO: Create a PDF, offline, "within" AI2 using jsPDF and base64 extn by Juan Antonio JavaScript Date Picker (Spanish) - Juan Antonio LaTex Editor with VisorWeb and MathJax (Offline) - …

It's not Java, but it might be good enough.