Example
There are variety of gsp tags available which can be used to create forms, textfield, radio buttons, check boxes, if-else, for each etc.
<g:if>
<g:if test="${session.role == 'admin'}">
<%-- show administrative functions --%>
</g:if>
<g:else>
<%-- show basic functions --%>
</g:else>
<g:each>
<g:each in="${[1,2,3]}" var="num">
<p>Number ${num}</p>
</g:each>
form
<g:form name="myForm" url="[controller:'book',action:'list']">...</g:form>
textField
<g:textField name="myField" value="${myValue}" />
radio
<g:radio name="myGroup" value="1"/>
Follow this link for more info - http://docs.grails.org/latest/guide/theWebLayer.html#tags
