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https://issues.apache.org/jira/browse/TAPESTRY-2119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12589552#action_12589552
]
Sinan Saral commented on TAPESTRY-2119:
---------------------------------------
I guess; you can also write it without the explicit reference to Form component:
public class ErrorMsg {
@Parameter(required = true, defaultPrefix =
TapestryConstants.LITERAL_BINDING_PREFIX)
private String _fieldName;
@Environmental(false)
private ValidationTracker _tracker;
public void setFieldName(String aFieldName) {
_fieldName = aFieldName;
}
void beginRender(MarkupWriter writer) {
if (_tracker == null)
throw new
RuntimeException(InternalMessages.encloseErrorsInForm());
Field f = new Field() {
public String getLabel() {
return null;
}
public boolean isDisabled() {
return false;
}
public String getClientId() {
return _fieldName;
}
public String getControlName() {
return _fieldName;
}
public boolean isRequired() {
return false;
}
};
String err = _tracker.getError(f);
writer.write(err);
}
}
> A new <t:error ../> tag should compliment existing <t:errors/> so that
> individual form error messages can be customized.
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: TAPESTRY-2119
> URL: https://issues.apache.org/jira/browse/TAPESTRY-2119
> Project: Tapestry
> Issue Type: New Feature
> Components: Core Components
> Affects Versions: 5.0.9
> Reporter: Adam Zimowski
> Priority: Minor
> Fix For: 5.1
>
> Original Estimate: 5h
> Remaining Estimate: 5h
>
> There shold be an easy way to use "normal text" as replacement for the popup
> bubbles, as we have the need to build our WebApps conforming to WAI (Web
> Accessibility Initiative). Tapestry provides <t:errors/> core component to
> display all form errors at once, but there is currently no easy way to
> control individual error messages. Following current design, an "intuitive"
> way for end user would be to look for <t:error/> tag but there is no such tag.
> Here is a draft of a proposed solution. The <t:errorMsg/> tag allows to
> control individual form error messages and can be placed inside or outside of
> a form effectively allowing end user to place form error anywhere on a page
> as plain text. This code should probably be enhanced to also allow control of
> individual fields: yes/no red X for icon next to a field, yes/no for
> automatic styling of field on error, etc.
> This component takes two arguments, a literal string denoting field
> for which error should be rendered, and form to which field is bound.
> The form must be accessible via getter from the page class.
> import org.apache.tapestry.Field;
> import org.apache.tapestry.MarkupWriter;
> import org.apache.tapestry.ValidationTracker;
> import org.apache.tapestry.annotations.BeginRender;
> import org.apache.tapestry.annotations.Parameter;
> import org.apache.tapestry.corelib.components.Form;
> public class ErrorMsg {
> @Parameter
> private String _fieldName;
> @Parameter
> private Form _form;
> public void setFieldName(String aFieldName) {
> _fieldName = aFieldName;
> }
> @BeginRender
> void renderMessage(MarkupWriter writer)
> {
> Field f = new Field() {
> public String getElementName() { return _fieldName; }
> public String getLabel() { return null; }
> public boolean isDisabled() { return false; }
> public String getClientId() { return _fieldName; }
> };
> ValidationTracker tracker = _form.getDefaultTracker();
> String err = tracker.getError(f);
> writer.write(err);
> }
> public void setForm(Form aForm) {
> _form = aForm;
> }
> }
> To display individual error messages simply place <t:errorMsg ../>
> anywhere on the page. It will render the error if there is one for a
> field.
> <t:layout xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd";>
> <strong><t:errorMsg fieldName="literal:foo" form="form"/></strong>
> <t:form t:id="myform">
> User Name:
> <input type="text" t:type="textfield" t:id="bar" t:value="bar"
> t:validate="required,minlength=3,maxlength=8"/><br/>
> Foo:
> <input type="text" t:type="textfield" t:id="foo" t:value="foo"
> t:validate="required"/>
> <p/>
> <input type="submit" t:type="submit" t:id="submitButton"
> value="Submit"/>
> <p/>
> <t:errorMsg fieldName="literal:bar" form="form"/><br/>
> <!-- you can even display same error twice :) -->
> <t:errorMsg fieldName="literal:bar" form="form"/>
> </t:form>
> </t:layout>
> Page Class:
> public class Start {
> @Persist
> private String _foo;
> @Persist
> private String _bar;
> @Component(id="myform")
> private Form _form;
> public Form getForm() {
> return _form;
> }
> public String getBar() {
> return _bar;
> }
> public String getFoo() {
> return _foo;
> }
> /* also foo/bar setters here */
> }
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