(Quick Reference)
                field
Purpose
Specifies an input field where the user can enter data.  An implicit "id" attribute is given the same value as the name unless you explicitly specify one.
Examples
<g:field type="number" name="isbn" min="5" max="10" required="" value="${bookInstance?.isbn}"/><g:field type="password" name="password" value="${userInstance?.password}"/><g:field type="url" name="url" value="${productInstance?.url}"/>Description
Attributes
name (required) - The name of the field 
type (required) - Specifies the type of element to display (button, checkbox, color, date, datetime, datetime-local, email, file, hidden, image, month, number, password, radio, range, reset, search, submit, tel, text, time, url, week) 
accept (optional) - Specifies the types of files that the server accepts (only for type="file") 
alt (optional) - Specifies an alternate text for images (only for type="image") 
autocomplete (optional) - Specifies whether the field should have autocomplete enabled 
autofocus (optional) - Specifies that the field should automatically get focus when the page loads 
checked (optional) - Specifies that the field should be pre-selected when the page loads (for type="checkbox" or type="radio") 
disabled (optional) - Specifies that the field element should be disabled 
height (optional) - Specifies the height of the field (only for type="image") 
list (optional) - Refers to a <datalist> element that contains pre-defined options for the field 
max (optional) - Specifies the maximum value for the field 
maxlength (optional) - Specifies the maximum number of characters allowed in the field 
min (optional) - Specifies a minimum value for the field 
multiple (optional) - Specifies that a user can enter more than one value in the field 
pattern (optional) - Specifies a regular expression that the field's value is checked against 
placeholder (optional) - Specifies a short hint that describes the expected value for the field 
readonly (optional) - Specifies that the field is read-only 
required (optional) - Specifies that the field must be filled out before submitting the form 
size (optional) - Specifies the width, in characters, of the field 
src (optional) - Specifies the URL of the image to use as a submit button (only for type="image") 
step (optional) - Specifies the legal number intervals for the field 
value (optional) - Specifies the value of the field 
width (optional) - Specifies the width of the field (only for type="image") 
Source
{source:tag=FormTagLib.field}
{source}