image_tag(source, options = {}) public

Returns an html image tag for the source. The source can be a full path or a file that exists in your public images directory. Note that specifying a filename without the extension is now deprecated in Rails. You can add html attributes using the options. The options supports two additional keys for convienence and conformance:

  • :alt - If no alt text is given, the file name part of the source is used (capitalized and without the extension)
  • :size - Supplied as "{Width}x{Height}", so "30x45" becomes width="30" and height="45". :size will be ignored if the value is not in the correct format. 
 image_tag("icon.png")  # =>
   <img src="/images/icon.png" alt="Icon" />
 image_tag("icon.png", :size => "16x10", :alt => "Edit Entry")  # =>
   <img src="/images/icon.png" width="16" height="10" alt="Edit Entry" />
 image_tag("/icons/icon.gif", :size => "16x16")  # =>
   <img src="/icons/icon.gif" width="16" height="16" alt="Icon" />
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September 30, 2011 - (>= v3.0.0)
1 thank

Using a block with image_tag

HTML5 officially supports block-level elements in the anchor tag and Rails 3 allows you to pass a block to image_tag:

<%= image_tag(some_path) do %>

<%= content_tag(:p, "Your link text here")

<% end %>

July 10, 2008
0 thanks

watch out for urls with &

image_tag(‘x.com/aaa?a=1&b=2’) = x.com/aaa?a=1&amp;b=2

October 31, 2008
0 thanks

By images's sub dirctionary to img tag

image_tag(“icons/edit.png”) # => 

<img src="/images/icons/edit.png" alt="edit" />
March 10, 2010
0 thanks

Specify your own template

You can specify you own template this way:

def notice
  ...
  @template = "some_other_name.html.erb"
end
June 26, 2013 - (v3.2.13)
0 thanks

Typing mismatch

This block

if size = options.delete(:size)
  options[:width], options[:height] = size.split("x") if size =~ %{^\d+x\d+$}
end

has type mismatch

%r{^\d+x\d+$}