Flowdock
hidden_field_tag(name, value = nil, options = {}) public

Creates a hidden field.

Takes the same options as text_field_tag

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February 7, 2011
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onchange attribute on a hidden field is useless

In the third example there is no sense to set onchange event since it will never happen…

December 8, 2011
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hidden field can be changed by JS

Plumba, it’s not that useless if you think about possibility to change a hidden field with JS