Passing array via hidden fields to rails

Question

i have a hidden_tag like this in my form

 <%= f.hidden_field :loc , {:multiple => true}  %>

which renders to

 <input id="business_loc" multiple="multiple" name="business[loc][]" type="hidden" style="color: rgb(175, 175, 175); " value="">

currently am setting the business_loc value as a comma seperated string hoping rails would recognize when submit the form. But this is the value i got on the server side

      "loc"=>["80.22167450000006,13.0454044"]

instead

      "loc"=>[80.22167450000006,13.0454044]

how do i set the correct value in hidden field, so rails can understand it correctly.

@mischa, no idea, i generated the code using hidden_field tag.. :) — RameshVel
– RameshVel, Commented Aug 24, 2011 at 13:12

Winfield · Accepted Answer · 2011-08-24 14:21:53Z

3

You need to use multiple hidden fields, one for each element of the array of values.

For example:

<input id="business_loc" multiple="multiple" name="business[loc][]" type="hidden" style="color: rgb(175, 175, 175); " value="80.22167450000006">
<input id="business_loc" multiple="multiple" name="business[loc][]" type="hidden" style="color: rgb(175, 175, 175); " value="13.0454044">

...if you need code to dynamically add these with JS, here's a jQuery example:

var field = $('<input id="business_loc" multiple="multiple" name="business[loc][]" type="hidden" style="color: rgb(175, 175, 175); " value="13.0454044">');
var form = $('#your-form-id');
form.append(field);

edited Aug 24, 2011 at 14:21

answered Aug 24, 2011 at 13:45

Winfield

19.2k4 gold badges55 silver badges65 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

RameshVel Over a year ago

i though of that. but i am populating the hidden value from the client side, and its harder this way. because i need to handle lot of values

Winfield Over a year ago

Yes, you will need to dynamically add a new element.

alexventuraio Over a year ago

What if now I need to have a different ID for each input? Because in the same way they were added with jQuery, now I want to remove any of them by its ID.

epicgrim · Accepted Answer · 2012-08-07 17:49:29Z

1

I've found text_area's to make things work without having to add a bunch of hidden forms. Just set the value of the text area to something that looks like [1,31,51,61] and it should work, assuming in your model you have serialize :var

answered Aug 7, 2012 at 17:49

epicgrim

314 bronze badges

Comments

sixty4bit · Accepted Answer · 2014-10-02 04:17:52Z

1

I had this same problem recently. My solution was to handle it on the server side by simply splitting the array at the comma. In my case it looks like this:

  # thing_that_has_many_objects.rb     <-- showing custom setter method from the model because my example involves using a virtual attribute
  # params[object_ids] = ["1,2,3,4,5"] <-- from the form - note the format of array with only one element

  def objects=(object_ids)       
    split_array = object_ids[0].split(',') 
    split_array.each do |id|
      self.objects.build(object_id: id)
    end
  end

edited Oct 2, 2014 at 4:17

answered Oct 2, 2014 at 4:12

sixty4bit

8,0347 gold badges38 silver badges63 bronze badges

1 Comment

alexventuraio Over a year ago

How do you invoke the custom setter to be executed? In order to make the splitting.

Collectives™ on Stack Overflow

Passing array via hidden fields to rails

3 Answers 3

3 Comments

Comments

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

3 Comments

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related