RobG wrote: > > On Apr 24, 4:05 am, katz <bridgeuto...@gmail.com> wrote: > >> Greetings. >> I need to learn how to achieve to dynamically copy form field values >> using Prototype or possibly Ruby. >> >> I want to achieve something like >> this:http://websitebuildersresource.com/2009/02/05/copy-form-input-data-to... >> >> http://websitebuildersresource.com/demos/jquery-copy-form-data/ >> >> Sorry for posting a jQuery example. >> I'm fairly new to Prototype, Scriptaculous and RJS. My goal is to >> achieve similar result using the default libraries of Rails. >> Although I am aware of jQuery noConflict() and and all those techniques >> to make jquery work well with other libraries, I just don't want to use >> it for now. >> >> There aren't too many decent examples on how to copy form values for >> prototype. >> >> My question is: >> How do you use that $F function and form.serialize to copy form field >> values to other fields? >> Also event observers seem to fail to work if defined on head tag. Am I >> right? >> >> http://www.prototypejs.org/api/event/observe >> >> Examples aren't working for me. >> >> So I already have something like this: >> <input id="item_weight" >> type="text" value="0" size="10" name="item[weight]"/> >> >> <input id="item__copy_weight" >> type="text" value="0" size="10" name="item[copy_weight]"/> >> >> <input type="button" id="button3" value="Same as above" /> >> >> <script type="text/javascript"> >> >> $('button3').observe('click', function(e) { >> var form = Event.findElement(e, 'form'); >> > > All form controls have a reference to the form they are in, so: > > var form = this.form; > > >> var input = form.down('input[name="item[weight]"]'); >> > > Since you now have a reference to the form, the controls are easy: > > form.elements['item[copy_weight]'].value = form.elements['item > [weight]'].value; > > Thanks, Rob. That could be helpful someday. For now, using the html id instead of name is more convenient as I am adding several items with the same name.
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