Thymeleaf + Spring: get rid of the default element id

Ok, I have looked inside the source code of Thymeleaf (2.1.4.RELEASE) and the method responsible for setting element id in Spring dialect is org.thymeleaf.spring4.processor.attr.SpringInputGeneralFieldAttrProcessor.doProcess(...) (source on Github) that calls org.thymeleaf.spring4.processor.attr.AbstractSpringFieldAttrProcessor.computeId(...) (source on Github). If you look at computeId(...), you will see that there is no simple way to set empty id.

So we need to do it in not a simple way :) Here it is:
I created a custom dialect and defined a custom attribute noid. The markup looks like this:

<input type="text" th:field="*{year}" thex:noid="true" />

There is a great tutorial explaining how to create and use custom dialects in Thymeleaf and below is the most important part: attribute processor responsible for removing id attribute from given element.

Important things to note:

• high precedence value (9999) guarantees that this processor will be executed as the last one (so no other processors will modify id after this one is executed)
• modification type is set to substitution so we are completely replacing value of id element
• removeAttributeIfEmpty(...) returns true, rather self-explanatory, remove attribute if empty
• getModifiedAttributeValues(...) sets id to empty value and because above-mentioned method returns true, id attribute is removed

Code:

    public class NoIdAttrProcessor extends AbstractAttributeModifierAttrProcessor {

        public NoIdAttrProcessor() {
            super("noid");
        }

        @Override
        public int getPrecedence() {
            return 9999;
        }

        @Override
        protected ModificationType getModificationType(Arguments arguments, Element element, String attributeName, String newAttributeName) {
            return ModificationType.SUBSTITUTION;
        }

        @Override
        protected boolean removeAttributeIfEmpty(Arguments arguments, Element element, String attributeName, String newAttributeName) {
            return true;
        }

        @Override
        protected boolean recomputeProcessorsAfterExecution(Arguments arguments, Element element, String attributeName) {
            return false;
        }

        @Override
        protected Map<String, String> getModifiedAttributeValues(Arguments arguments, Element element, String attributeName) {
            Map<String, String> values = new HashMap<>(1);
            values.put("id", "");
            return values;
        }

    }