Replace unique classes by custom attributes, or use this in events

[danielschenk]

In the template, unique classes are defined (like: class="act-{{ key }}") which are used by the JavaScript to select all inputs which belong to a certain act. This is obviously not an intended use case of classes.

These should all be replaced by HTML5 custom data attributes, like:

<input data-act="{{ key }}" ...

This is already partly done for the free field inputs.

Alternatively, look into passing this in event handlers which could in some cases be sufficient to find the object needed (eg. as parent or sibling of).