before week 4

docs/week04/readme.md

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+# WebEngineering Module, Server Pages
+
+## Goals
+
+### Abilities
+- Being able to use dynamic content in server pages
+- Using pages, templates, taglibs, and layouts
+- Testing appropriately
+
+### Knowledge
+- Understanding the request-response cycle
+- Understanding the four ways of composing server pages plus when to use which
+- Where and how to validate
+- Optional: using Grails internationalized error messages for generic error display
+
+## Demo/Code walkthrough 
+
+Walk through the code of InPlaceCalculator
+incl. model, view, controller, tests.
+
+- Intermediate step:more generic field error handling
+- Use of _form_row.gsp template for smart, labeled fields	
+- Using a taglib for dynamic content
+- Grails specific: fully generic error messages plus I18N
+- Using a layout for the form
+
+## Practical work (may extend into homework)
+
+Make a Fahrenheit to Celsius converter.
+
+You best make a copy of each artifact that we used for the InPlaceCalculator
+(model, view, controller, tests, form_row template).
+Just copy the file into the same directory as the original and rename accordingly.
+
+You can reuse the _form_ layout.
+
+You can make use of the following conversion functions:
+
+	double c2f(double c) { c * 1.8d + 32 }
+	double f2c(double f) { (f-32) / 1.8d }
+
+It is probably best to work with two input fields: one for Fahrenheit, one for Celsius,
+and calculate a result for each of the inputs separately.