Using select2's selected option value in a rails forms field - ruby-on-rails

How do I assign the selected option value:
<select class="select2-simple-dropdown">
<% Season.all.each do |season| %>
<option id="chosen-season" value="<%= season.id %>"><%= season.name %></option>
<% end %>
</select>
To a form's field, let's say: Voyage.given_season ?

Use the rails select field instead and do it like this
<%= f.select :season_id, Season.all.pluck(:name, :id), {},
{ class: 'select2-simple-dropdown'} %>
Hope this helps.

If you want your select input to accept multiple options, you can pass multiple: true
<%= f.select(:season_id, Season.all.collect {|m| [ m.name, m.id] }, class: "form-control select2-simple-dropdown", id: "list-markets", multiple: true) %>
https://aalvarez.me/posts/select2-with-simple-form-in-rails/

Related

How to pass selected value in select tag through form_tag rails

I need to pass selected option values in rails form tag.Below code I am using.When I click Add to User group button,it will call addToUserGroups action.I need to get selected dropdown value when I click this button.
<%= form_tag(contoller: "custom_group", action: "addToUserGroups") do%>
<%=submit_tag "Add to User Group", class: "btn mx-auto btn-primary", style: "width: 200px"%>
<% end %>
I need to send this selected dropdown value to addToUserGroups controller.How to achieve this?
<select id="select-update" class="form-control">
<% #all_execgroup_list.each do |parameter| %>
<option value="<%= parameter['groupname'] %>"><%= parameter['groupname']%></option>
<% end %>
</select>
You can use the "select" option which is the second argument in the `options_for_select' helper.
<%= f.select :color, options_for_select(#color_options, selected: #color_value) %>
The important part here is selected: #color_value
Verbose version:
<%= f.select :color, options_for_select([["Blue", "blue"],["Green","Green"],["Yellow","yellow"]], selected: "yellow") %>
Yellow will be the default selected value in the dropdown.
options_for_select first argument takes a 2d array. What gets displayed in the dropdown is in first element in the array and the value is the second element in the array.
[["Display Name", "value"],["Display Name 2", "value 2"]]
You can use select_tag for that, like below
<%= select_tag :field_name_here, options_for_select(all_execgroup_list.all) %>

How to dispaly selected value in edit page

How to dispaly selected value in edit page.
in my form i need to display selected value. it is not selecting the value which i selected and submitted. else it shows "please select Study material".
This is my StudyMaterial model
class StudyMaterial < ActiveRecord::Base
TYPES = ['Question Paper', 'Book', 'Audio', 'Video']
enum study_material_type: TYPES
end
This is my 'form.html.erb'
<select class=" required form-control" name="study_material[study_material_type]" id="study_material_study_material_type" data-validation="required" data-validation-error-msg="Select study material">
<option value="">Please select study material</option>
<option value="Question Paper">Question Paper</option>
<option value="Book">Book</option>
<option value="Audio">Audio</option>
<option value="Video">Video</option>
</select>
How to dispaly selected value in edit page.
I am getting this error when i click edit studymaterial page
Please help me to solve this error
<%= form_for #study_material do |f| %>
<%= f.select :study_material_type, StudyMaterial::TYPES.map{|v| [v,v]}, selected: f.object.try(:study_material_type) , required: true, include_blank: "Select" %>
<% end %>
I think, you look something like that:-
<%= form_for #study_material do |f| %>
<%= f.select :study_material_type, StudyMaterial::TYPES, include_blank: "Please select study material", required: true %>
<% end %>
It will display selected value.

Options_for_select not working: dropdown box for boolean

I'm trying to include a boolean value as a dropdown box using the following code in my edit view:
<div class="col-md-8">
<%= f.select :match, options_for_select([['On', true], ['Off', false]]), class: 'form-control input-md' %>
</div>
However I'm experiencing two problems:
1.It does not display the correct value. Even when the user's value is false, it still displays On.
2.It does not implement the styling. The inspector shows that it implements it as follows:
<div class="col-md-8">
<select name="user[match]" id="user_match">
<option value="true">On</option>
<option value="false">Off</option>
</select>
</div>
What am I doing wrong?
Do it like this:
<%= f.select :match, options_for_select([['On', true], ['Off', false]], selected: your_object.match),{}, {class: 'form-control input-md'} %>

Rails form_for multiple collection_select, values not selected on form failure

I'm not sure why, but my form is not showing the options selected on submit, even though the params hash shows that the information is being returned to the page.
Collection select code:
<%= f.collection_select :post_topic_ids, PostTopic.all, :id, :name, {}, { multiple: true, class: 'form-control' } %>
Which renders:
<select multiple="multiple" class="form-control" name="post[post_topic_ids][]" id="post_post_topic_ids">
<option value="1">Psychology</option>
<option value="2">Engineering</option>
<option value="3">Nanotechnology</option>
</select>
Params returned after form validation error
params = {"post"=>{"post_topic_ids"=>["", "1"]}}
Update
I have also tried:
<%= select_tag 'post_topic_ids', options_for_select(PostTopic.all.collect{ |p| [p.name, p.id] }), multiple: true %>
and:
<%= select_tag 'post_topic_ids', options_from_collection_for_select(PostTopic.all, "id", "name"), multiple: true %>
Which renders:
<select name="post_topic_ids[]" id="post_topic_ids" multiple="multiple"><option value="1">Psychology</option>
<option value="2">Engineering</option>
<option value="3">Nanotechnology</option></select>
you need to specify which element is selected a third parameter
<%= select_tag 'post_topic_ids', options_for_select(PostTopic.all.collect{ |p| [p.name, p.id] }, --->selected_element<---), multiple: true %>
look at http://apidock.com/rails/ActionView/Helpers/FormOptionsHelper/options_for_select for some examples.

RoR 3.2.8: Is there an HTML5 combobox helper?

Right now, I'm using the form_for.select and options_for_select rails helpers to create a select box with the data from the model. However, what I really need is a combobox like the one introduced with HTML5:
<input type=text list=browsers >
<datalist id=browsers >
<option> Google
<option> IE9
</datalist>
Is there a rails helper for creating such elements?
No, but it's quite easy to setup your own form builder helper method to achieve such a result, a simple example would be:
app/form_builders/combobox_form_builder.rb
class ComboboxFormBuilder < ActionView::Helpers::FormBuilder
include ActionView::Context # for nested content_tag
include ActionView::Helpers::FormTagHelper #for sanitize_to_id method access
def combobox_tag(name, options, opts= {})
#template.content_tag(:input, :name => name, :id => sanitize_to_id(name), :type => "text", :list => opts[:list_id]) do
content_tag(:datalist, :id => opts[:list_id]) {options}
end
end
end
After restarting your server you can implement your new combobox using the form builder by specifying a builder argument in your form_for call:
<%= form_for #foo, builder: ComboboxFormBuilder do |f| %>
<%= f.combobox_tag(:browser, options_for_select(["Firefox", "Chrome", "IE9"]), :list_id => "list")%>
<% end %>
Output HTML:
<input type="text" name="browser" list="list" id="browser">
<datalist id="list">
<option value="Firefox">Firefox</option>
<option value="Chrome">Chrome</option>
<option value="IE9">IE9</option>
</datalist>
Keep in mind that both IE & Safari do not offer support for the HTML5 Datalist.
<%= form_for #person do |f| %>
<%= f.label :first_name, "First Name" %>:
<%= f.text_field :first_name, list: 'first-name' %>
<datalist id="first-name">
<% Person.all.each do |person| %>
<option value="<%= person.first_name %>"></option>
<% end %>
</datalist>
<%= f.submit %>
<% end %>
You may also want to do distinct:
<% Person.select(:first_name).distinct.each do |person| %>
Just example from my code:
= form_tag controller:'beer', action: 'create' do
= text_field :beer, :name, list: 'beer-name'
%datalist#beer-name
- Beer.all.each do |beer|
%option{value: beer.name}

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