Tapestry Fixed Control Name Fixin

AbstractField.java

@SupportsInformalParameters
public abstract class AbstractField implements Field {

  @SetupRender
  final void setup() {
    String id = clientId;
    if (formSupport == null)
      throw new RuntimeException(String.format("Component %s must be enclosed by a Form component.",
        resources.getCompleteId()));

    assignedClientId = jsSupport.allocateClientId(id);
    String controlName = formSupport.allocateControlName(id);

    formSupport.storeAndExecute(this, new Setup(controlName));
    formSupport.store(this, PROCESS_SUBMISSION_ACTION);
  }

}

AfterTemplate.html

<t:form t:id="afterForm">

<t:zone t:id="afterZone" t:mixins="FixedControlName">
  <t:label for="afterCountrySelect"/>
  <t:select t:id="afterCountrySelect" 
    value="country" 
    model="countryModel"
    zone="prop:afterZoneId" 
    label="message:label.country"/>

  <t:label for="afterCitySelect"/>
  <t:select t:id="afterCitySelect" 
    value="city" 
    model="cityModel"
    label="message:label.city"/>
</t:zone>

</t:form>

AfterUpdate.html

<div class="t-zone" id="beforeZone_139c3db913f">
  <input value="..." name="t:formdata" type="hidden"/>

  <label for="beforeCountrySelect_139c3db913f">Country</label>
  <select id="beforeCountrySelect_139c3db913f" name="beforeCountrySelect_139c3db913f">
    <!-- Options goes here -->
  </select>

  <label for="beforeCitySelect_139c3db913f">City</label>
  <select id="beforeCitySelect_139c3db913f" name="beforeCitySelect_139c3db913f">
    <!-- Options goes here -->
  </select>
</div>

BeforeTemplate.html

<t:form t:id="beforeForm">

<t:zone t:id="beforeZone">
  <t:label for="beforeCountrySelect"/>
  <t:select t:id="beforeCountrySelect" 
    value="country" 
    model="countryModel"
    zone="prop:beforeZoneId" 
    label="message:label.country"/>

  <t:label for="beforeCitySelect"/>
  <t:select t:id="beforeCitySelect" 
    value="city" 
    model="cityModel"
    label="message:label.city"/>
</t:zone>

</t:form>

BeforeUpdate.html

<div class="t-zone" id="beforeZone">
  <input value="..." name="t:formdata" type="hidden"/>

  <label for="beforeCountrySelect">Country</label>
  <select id="beforeCountrySelect" name="beforeCountrySelect">
    <!-- Options goes here -->
  </select>

  <label for="beforeCitySelect">City</label>
  <select id="beforeCitySelect" name="beforeCitySelect">
    <!-- Options goes here -->
  </select>
</div>

FieldRendering.java

public class Select extends AbstractField

  @BeforeRenderTemplate
  void options(MarkupWriter writer) {
    selectedClientValue = tracker.getInput(this);
    if (selectedClientValue == null)
      selectedClientValue = value == null ? null : encoder.toClient(value);
    // ...
    SelectModelVisitor renderer = new Renderer(writer);
    model.visit(renderer);
  }

}

public abstract class AbstractTextField extends AbstractField

  @BeginRender
  void begin(MarkupWriter writer) {
    String value = tracker.getInput(this);
    if (value == null) {
      value = fieldValidationSupport.toClient(this.value, resources, translate, nulls);
    }
    writeFieldTag(writer, value);
    // ...
  }

}

FieldSubmission.java

public class Select extends AbstractField

  protected void processSubmission(String controlName) {
    String submittedValue = request.getParameter(controlName);
    tracker.recordInput(this, submittedValue);
    // ...
  }

}

public abstract class AbstractTextField extends AbstractField

  protected void processSubmission(String controlName) {
    String rawValue = request.getParameter(controlName);
    tracker.recordInput(this, rawValue);
    // ...
  }

}

FixedControlName.java

public class FixedControlName {

  /**
   * This parameter defines namespace for control names. It will use {@code fixed} namespace by default.
   */
  @Parameter(defaultPrefix = BindingConstants.LITERAL, value = "fixed", allowNull = false)
  private String namespace;

  @Inject
  private Environment environment;

  private boolean insideForm;

  @BeforeRenderBody
  void changeFormSupport() {
    final FormSupport existingFormSupport = environment.peek(FormSupport.class);
    insideForm = existingFormSupport != null;
    if (insideForm) {
      // replace FormSupport with hacked wrapper
      environment.push(FormSupport.class, new FormSupportAdapter(existingFormSupport) {
        private final IdAllocator allocator = new IdAllocator("_" + namespace);

        @Override
        public String allocateControlName(final String id) {
          return allocator.allocateId(id);
        }
      });
    }
  }

  @AfterRenderBody
  void restoreFormSupport() {
    if (insideForm) {
      // remove hacked FormSupport wrapper
      environment.pop(FormSupport.class);
    }
  }
}