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Editorial Team
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Asked: 2026-05-26T02:08:04+00:00

I’m developing project on rails 2.3.8 and I need to observe field on drop

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I’m developing project on rails 2.3.8 and I need to observe field on drop down menu which develop using collection select. Please can some one explain how to observe field ?
My collection select code is like this

<%= collection_select("event", "trainer_id", @trainers , :id, :name, {:prompt => true}) %>

And I don’t know how to use observe field for this. So please can some one explain about this ?

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1 Answer

  1. Editorial Team

    Related: Auto populate a text field based on another text field

    observe_field(field_id, options = {})

    Observes the field with the DOM ID specified by field_id and calls a callback when its contents have changed. The default callback is an Ajax call. By default the value of the observed field is sent as a parameter with the Ajax call.

    Read this details: http://apidock.com/rails/ActionView/Helpers/PrototypeHelper/observe_field

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