How to direct to submit button to another action - grails

Question

how can I jump to another action in controller?
I have form and several submit buttons. Every submmit button has name.
<g:form action="save" method="post">
<g:input name="title" value="${letter.title}" />
<g:input name="comments[0].text" value="${letter.comments[0].text}" />
<g:submitButton name="save" value="save" />
<g:submitButton name="addComment" value="add" />
</g:form>
def save = {
if (params.addComment){
letter.addToComents( new Comment() )
render(view:'form', model:["letter": letter])
return
}
...
if ( letter.save() )
...
}
def addComment = {
...
}
It works, but it is not good. I want move code from block "addComment" to action addComment:
def save = {
if (params.addComment){
// it don´t work
redirect ( action:"addComment" )
}
...
if ( letter.save() )
...
}
def addComment = {
letter.addToComents( new Comment() )
render(view:'form', model:["letter": letter])
return
}
Or it exists better solution?
It would be nice:
<g:submitButton name="save" value="save" action="save" />
<g:submitButton name="addComment" value="add" action="addComment" />
Thanks a lot
Tom

Answer 1

Use the g:actionSubmit tag instead.
<g:form method="post">
<g:input name="title" value="${letter.title}" />
<g:input name="comments[0].text" value="${letter.comments[0].text}" />
<g:actionSubmit action="save" value="Save" />
<g:actionSubmit action="addComment" value="Add Comment" />
</g:form>

Answer 2

For those who are using Twitter Bootstrap plugin (or need something besides text in your button) and want to add a glyphicon to the button, you will need to use the button tag. So you need to do something like
SNIPPET 1.
<g:form role="form" method="post">
...your inputs
<button type="submit" name="_action_save">
<span class="glyphicon glyphicon-ok"></span>
Save
</button>
<button type="submit" name="_action_saveAndNew">
<span class="glyphicon glyphicon-ok"></span>
Save and New
</button>
</g:form>
where in your button you will need to specify the name of your action with the prefix
_action_
to get something like this
name="_action_yourActionName"
just a little reminder, since I am using twitter Bottstrap plugin 3.0 this is how you add a glyphicon
<span class="glyphicon glyphicon-ok"></span>
SNIPPET 1. has a similar behaviour to:
<g:form role="form" method="post">
...your inputs
<g:actionSubmit action="save" value="Save" />
<g:actionSubmit action="saveAndNew" value="Save and New" />
</g:form>
In the end this example help you have a similar behaviour to actionSubmit in cases where you don't want or can't use it. This is only an alternative and it'd be better to use actionSubmit whenever possible.