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The placeholder attribute is essentially invisible to screen readers, so it can be used in conjunction with <label> , however it should not be used as a substitute for a <label> .
Placeholder text, located inside a form field, is an additional hint, description, or example of the information required for a particular field. These hints typically disappear when the user types in the field.
With rails >= 3.0, you can simply use the placeholder option.
f.text_field :attr, placeholder: "placeholder text"
In Rails 4(Using HAML):
=f.text_field :first_name, class: 'form-control', autofocus: true, placeholder: 'First Name'
For those using Rails(4.2) Internationalization (I18n):
Set the placeholder attribute to true:
f.text_field :attr, placeholder: true
and in your local file (ie. en.yml):
en:
helpers:
placeholder:
model_name:
attr: "some placeholder text"
Here is a much cleaner syntax if using rails 4+
<%= f.text_field :attr, placeholder: "placeholder text" %>
So rails 4+ can now use this syntax instead of the hash syntax
I tried the solutions above and it looks like on rails 5.* the second agument by default is the value of the input form, what worked for me was:
text_field_tag :attr, "", placeholder: "placeholder text"
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