Hi Thiago,
Thanks for the response: Here is the code;
import org.apache.tapestry5.Field;
import org.apache.tapestry5.MarkupWriter;
import org.apache.tapestry5.ValidationTracker;
import org.apache.tapestry5.annotations.BeginRender;
import org.apache.tapestry5.annotations.Environmental;
import org.apache.tapestry5.annotations.Parameter;
import org.apache.tapestry5.corelib.components.Form;
import org.apache.tapestry5.dom.Element;
/**
* test implementation to allow for custom validation error messages below
an input field.
*
* Within a tml file, place something like:
* <label t:type="sh/FieldValidationErrorMsg" t:fieldId="inHandDate">
* Please enter a <i>valid date</i>
* </label>
* in the vicinity of an input element with matching field id:
* <input type="text" t:type="textfield" t:clientId="inHandDate"
t:value="inHandDate"
* t:translate="string"/>
*
* The component will add attributes for="[fieldId]" and class="error"
(defined
* in the corresponding tml file), and (in case the field had an error)
style="display:block"
* to this label (CSS class error will by default hide the div).
*
* If parameter leaveMessage is omitted or false, the whole error div will
be removed
* from the rendered page if the corresponding input field had no
validation error.
* Otherwise it will be left in place (hidden through CSS) so that
client-side validation
* may use these messages to show if so desired.
*
* If parameter errorId is present, the error message will only show if the
field's
* tracker errorId matches the value of parameter errorId (so you can
define multiple
* messages for the same field: each targeted at a specific validation
error).
*
* If parameter form is present, it will be used as the identifier of the
form that
* contained the input element (so it's only relevant if there are multiple
forms
* on a page). Otherwise, the form will be derived from the environmental
information.
* If parameter form is used, the page's java class will need to have the
proper get
* method for the form: public Form getMyForm() {return this.myForm;}
*
* If parameter labelId is present, the value will be used as id on the
label element.
*/
public class FieldValidationErrorMsg {
@Parameter(required = true, defaultPrefix="literal")
private String fieldId;
@Parameter
private Form form;
@Parameter
private Boolean leaveMessage; //TODO: this should ideally be a
page/flow configuration in stead of a parameter so that we can choose to
leave all error messages in place (but hidden) if those could be used for
client-side validation purposes.
@Parameter (defaultPrefix="literal")
private String errorId;
@Parameter (defaultPrefix="literal")
private String labelId;
@Environmental(false)
private ValidationTracker tracker;
public void setFieldId(String fieldId) {
this.fieldId = fieldId;
}
public String getFieldId() {
return this.fieldId;
}
public String getLabelId() {
return this.labelId;
}
public void setForm(Form form) {
this.form = form;
}
public void afterRenderBody(MarkupWriter writer) {
final String _fieldId = this.fieldId;
Field f = new Field() {
public String getLabel() { return null; }
public boolean isDisabled() { return false; }
public String getClientId() { return _fieldId; }
public String getControlName() { return _fieldId; }
public boolean isRequired() { return false; }
};
// grab the FieldValidationErrorMsg component
Element msgEle = writer.getElement();
ValidationTracker tracker;
if ( this.form != null ) {
tracker = this.form.getDefaultTracker();
} else {
tracker = this.tracker;
}
if ( (this.errorId != null && tracker.getError(f) != null &&
tracker.getError(f).contains(this.errorId))
|| (this.errorId == null && tracker.inError(f)) ) {
// we need to display the error message, so do nothing, leave
it as is
} else {
// remove the error message, unless there's an instruction to
leave it in place
if (this.leaveMessage==null || !this.leaveMessage) {
msgEle.removeChildren();
msgEle.pop();
} else {
// we're leaving it in place, but will hide it on page load
by adding a class "hidden"
String curClassValue = msgEle.getAttribute("class");
String[] classValues = {"class","hidden "+curClassValue};
msgEle.forceAttributes(classValues);
}
}
}
}
and FieldValidationErrorMsg.tml for the same:
<?xml version="1.0" encoding="UTF-8"?>
<html for="${fieldId}" class="error" generated="false" xmlns:t="
http://tapestry.apache.org/schema/tapestry_5_1_0.xsd";>
<t:if test="labelId">
<t:sh.common.addAttribute name="id" value="${labelId}"/>
</t:if>
<t:body />
</html>
Thanks,
Rukmini
On Tue, Aug 13, 2013 at 9:55 AM, Thiago H de Paula Figueiredo <
thiag...@gmail.com> wrote:
> On Tue, 13 Aug 2013 13:48:29 -0300, rukmini n <rukmini...@gmail.com>
> wrote:
>
> Hi all,
>>
>
> Hi!
>
>
> I get the below exception while rendering tml file.
>>
>
> What's the Java source code for FieldValidationErrorMsg?
>
> --
> Thiago H. de Paula Figueiredo
>
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