CHAPTER 7: Rapid Web Development with Grails 341

11.

   Lines 22 to 28: The <g:hasErrors> tag examines the Book instance assigned to

its bean attribute and renders its body if errors are found.

   Line 29 to 36: The <g:form> tag sets up an HTML form. This tag has an action

that will result in the URL to submit the form to.

   Line 31: <g:render > applies a built-in or user-defined Groovy template against

a model so that templates can be shared and reused. The template in this case

is called form and is located in the views directory as _form.gsp. The leading

underline denotes that the .gsp file is a template.

The Show View

The show view is illustrated in Listing 7-29.