form_tag
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- What's this?
form_tag(url_for_options = {}, options = {}, *parameters_for_url, &block)
public
Starts a form tag that points the action to an url configured with url_for_options just like ActionController::Base#url_for. The method for the form defaults to POST.
Examples:
- form_tag('/posts') => <form action="/posts" method="post">
- form_tag('/posts/1', :method => :put) => <form action="/posts/1" method="put">
- form_tag('/upload', :multipart => true) => <form action="/upload" method="post" enctype="multipart/form-data">
ERb example:
<% form_tag '/posts' do -%> <div><%= submit_tag 'Save' %></div> <% end -%>
Will output:
<form action="/posts" method="post"><div><input type="submit" name="submit" value="Save" /></div></form>
Options:
- :multipart - If set to true, the enctype is set to "multipart/form-data".
- :method - The method to use when submitting the form, usually
either "get" or "post".
If "put", "delete", or another verb is used, a hidden input with name _method is added to simulate the verb over post.
form_tag with named route and html class
<% form_tag position_user_card_path(@user, card), :method => :put, :class => ‘position-form’ do %>
How to submit current url
For example to change some kind of param on select change…
<%= form_tag({}, {:method => :get}) do %> <%= select_tag :new_locale, options_for_select(I18n.available_locales, I18n.locale), :onchange => "this.form.submit();" %> <% end %>
To add an ID to the form
Found this the hard way, but to add an ID to the form generated by form_tag, you must explicitly make hashes.
Add ID
<%= form_tag({:action => 'create'}, {:id => 'anID'}) %>
Erb tags
The <% -%> is not being used since Rails 3.
The example above should be changed to:
<%= form_tag('/posts') do %> <div><%= submit_tag 'Save' %></div> <% end %>