How can I do: required="false" in grails g:select?

required="false" does not work in "g:select" tag

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Example:

<g:select from="${}" name="select" required="false" />

and

<g:select from="${}" name="select" required="true" />

produces a html tag required (in html5)

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How can I make the "g:select" produces the required or not, dynamically?

Just remove required, for eg:

<g:select id="select" from="${}" name="select"/>

You can use jquery to change the g:select to be required or not required. For example, lets say you have another

<g:select id="yesNo" from="[yes, no]">

In the gsp, use javascript:

$( "#yesNo" ).change(function() {
  if($(this)[0].value == "yes") {
     $( "#select" ).attr('required', 'required')
  }
  else {
     $( "#select" ).removeProp( "required" )
  }
});

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Another approach is if you pass a variable required to gsp, you can use <g:if>:

In controller:

[required: "true"] //If dont want required, simply don't return required at all

In gsp:

<g:if test="${required}">
   <g:select from="${}" name="select" required/>
</g:if>
<g:else>
   <g:select from="${}" name="select"/>
</g:else>