I send you some sourcecode of mine which heavily uses component
binding - a complete grid is initialized in the source-code. Code
quality is not at its best though, so take it with care.
regards,
Martin
public getEncashmentGrid()
{
HtmlPanelGrid grid = new HtmlPanelGrid();
HtmlOutputLabel textLabel = new HtmlOutputLabel();
textLabel.setId("claimTypeLabel");
textLabel.setValue(GuiUtil.getResourceLabelIfAvailable(
getGuiContext().getLocale(),
"IN.claimTypeLabel",null,""));
textLabel.setValueBinding("styleClass",
getValueBinding("#{encashmentDetail.editMode?'label':'textLabel'}"));
textLabel.setRendered(!getGuiContext().getSessionData().isEncashmentMode());
textLabel.setFor("claimType");
grid.getChildren().add(textLabel);
ValueBinding valueBinding;
ValueBinding editAndNotEncashmentsModeValueBinding =
getValueBinding("#{encashmentDetail.editMode &&
!sessionData.encashmentMode}");
ValueBinding notEditAndNotEncashmentsModeValueBinding =
getValueBinding(
"#{!encashmentDetail.editMode &&
!sessionData.encashmentMode}");
HtmlPanelGroup group = new HtmlPanelGroup();
group.setId("claimTypeGroup");
group.setRendered(!getGuiContext().getSessionData().isEncashmentMode());
grid.getChildren().add(group);
valueBinding =
getValueBinding("#{encashmentDetail.encashment.claimType}");
HtmlSelectOneMenu claimTypeSelectOneMenu = new HtmlSelectOneMenu();
claimTypeSelectOneMenu.setId("claimType");
claimTypeSelectOneMenu.setValueBinding("value", valueBinding);
claimTypeSelectOneMenu.setValueBinding("rendered",
editAndNotEncashmentsModeValueBinding);
claimTypeSelectOneMenu.setStyleClass("selectOneMenu");
claimTypeSelectOneMenu.setRequired(true);
claimTypeSelectOneMenu.setValueBinding("disabled",getValueBinding("#{encashmentDetail.encashmentExisting==true}"));
UISelectItems items = new UISelectItems();
items.setId("claimTypeSelectItems");
items.setValueBinding("value",getValueBinding("#{encashmentDetail.claimTypes}"));
claimTypeSelectOneMenu.getChildren().add(items);
group.getChildren().add(claimTypeSelectOneMenu);
HtmlOutputText text = new HtmlOutputText();
text.setId("claimType");
text.setValueBinding("value",
getValueBinding("#{applicationData.claimTypeMap[encashmentDetail.encashment.claimType]}"));
text.setValueBinding("rendered",
notEditAndNotEncashmentsModeValueBinding);
text.setStyleClass("text");
group.getChildren().add(text);
Fields fields =
getClaimTypesToFields().getFields(getEncashment().getClaimType());
if(fields == null)
{
log.error("No fields defined for claimType :
"+getEncashment().getClaimType());
throw new IllegalStateException("No fields defined for
claimType : "+getEncashment().getClaimType());
}
Iterator it = fields.getFields();
while (it.hasNext())
{
Field field = (Field) it.next();
JsValueChangeListener listener = new JsValueChangeListener();
listener.setId("valueChangeListenerFor"+field.getKey());
listener.setFor(field.getKey()+"Label");
listener.setExpressionValue("$destElem.innerHTML=claimTypesToFields[$srcElem.options[$srcElem.selectedIndex].value]['"+field.getKey()
+"']['label']+(claimTypesToFields[$srcElem.options[$srcElem.selectedIndex].value]['"+field.getKey()+"']['required']==true?'<span
class=\"requiredLabel\">*</span>':'')");
claimTypeSelectOneMenu.getChildren().add(listener);
JsValueChangeListener displayedLabelListener = new
JsValueChangeListener();
displayedLabelListener.setId("displayedValueChangeListenerFor"+field.getKey()+"Label");
displayedLabelListener.setFor(field.getKey()+"Label");
displayedLabelListener.setExpressionValue("claimTypesToFields[$srcElem.options[$srcElem.selectedIndex].value]['"+field.getKey()
+"']['displayed']==true?$destElem.style.display='inline':$destElem.style.display='none';");
claimTypeSelectOneMenu.getChildren().add(displayedLabelListener);
JsValueChangeListener displayedListener = new
JsValueChangeListener();
displayedListener.setId("displayedValueChangeListenerFor"+field.getKey());
displayedListener.setFor(field.getKey());
displayedListener.setExpressionValue("claimTypesToFields[$srcElem.options[$srcElem.selectedIndex].value]['"+field.getKey()
+"']['displayed']==true?$destElem.style.display='inline':$destElem.style.display='none';");
claimTypeSelectOneMenu.getChildren().add(displayedListener);
textLabel = new HtmlOutputLabel();
textLabel.setId(field.getKey()+"Label");
textLabel.setFor(field.getKey());
if(!field.isDisplayed())
{
textLabel.setStyle("display:none;");
}
//valueBinding = new ValueBindingImpl(
//
FacesContext.getCurrentInstance().getApplication(),"#{label."+field.getKey()+"Label}");
textLabel.setValue(field.getLabel());
textLabel.setValueBinding("styleClass",
(getValueBinding("#{encashmentDetail.editMode?'label':'textLabel'}")));
grid.getChildren().add(textLabel);
valueBinding = new ValueBindingImpl(
FacesContext.getCurrentInstance().getApplication(),"#{encashmentDetail.encashment."+field.getKey()+"}");
ValueBinding editModeValueBinding = new ValueBindingImpl(
FacesContext.getCurrentInstance().getApplication(),
"#{encashmentDetail.editMode}");
ValueBinding notEditModeValueBinding = new ValueBindingImpl(
FacesContext.getCurrentInstance().getApplication(),
"#{!encashmentDetail.editMode}");
ValueBinding editNewModeValueBinding = new ValueBindingImpl(
FacesContext.getCurrentInstance().getApplication(),
"#{encashmentDetail.editMode &&
encashmentDetail.vloClaimNr <= 0}");
ValueBinding notEditNewModeValueBinding = new ValueBindingImpl(
FacesContext.getCurrentInstance().getApplication(),
"#{!encashmentDetail.editMode ||
(encashmentDetail.editMode && encashmentDetail.vloClaimNr >0)}");
group = new HtmlPanelGroup();
group.setId(field.getKey()+"group");
grid.getChildren().add(group);
HtmlInputText inputText = new HtmlInputText();
if(field.getKey().equals("currency"))
{
HtmlSelectOneMenu selectOneMenu = new HtmlSelectOneMenu();
selectOneMenu.setId("currency");
selectOneMenu.setValueBinding("value", valueBinding);
selectOneMenu.setValueBinding("rendered",
field.isOnlyInNewEditable()?editNewModeValueBinding:editModeValueBinding);
selectOneMenu.setStyleClass("selectOneMenu");
selectOneMenu.setRequired(true);
selectOneMenu.setValueBinding("disabled",getValueBinding("#{encashmentDetail.encashmentExisting==true}"));
items = new UISelectItems();
items.setId("currencyItems");
items.setValueBinding("value",getValueBinding("#{encashmentDetail.currencies}"));
selectOneMenu.getChildren().add(items);
group.getChildren().add(selectOneMenu);
}
else if(field.getKey().equals("claimContested"))
{
HtmlSelectOneMenu selectOneMenu = new HtmlSelectOneMenu();
selectOneMenu.setId("claimContested");
selectOneMenu.setValueBinding("value", valueBinding);
selectOneMenu.setValueBinding("rendered",
field.isOnlyInNewEditable()?editNewModeValueBinding:editModeValueBinding);
selectOneMenu.setStyleClass("selectOneMenu");
selectOneMenu.setRequired(true);
selectOneMenu.setValueBinding("disabled",getValueBinding("#{encashmentDetail.encashmentExisting==true}"));
selectOneMenu.setValueBinding("converter", getValueBinding(
"#{converterBean.booleanConvt}"));
items = new UISelectItems();
items.setId("claimContestedItems");
items.setValueBinding("value",getValueBinding("#{encashmentDetail.yesNoList}"));
selectOneMenu.getChildren().add(items);
group.getChildren().add(selectOneMenu);
}
else
{
inputText.setId(field.getKey());
inputText.setValueBinding("value", valueBinding);
if(!field.isEditable())
{
inputText.setRendered(false);
}
else
{
inputText.setValueBinding("rendered",
field.isOnlyInNewEditable()?editNewModeValueBinding:editModeValueBinding);
}
inputText.setStyleClass("text");
inputText.setRequired(field.isRequired());
if(!field.isDisplayed())
{
inputText.setStyle("display:none;");
}
if(field.isUsesAmountConverter())
{
inputText.setValueBinding("converter", new
ValueBindingImpl(FacesContext.getCurrentInstance().getApplication(),
"#{converterBean.amountConvt}"));
}
if(field.isRequiresLengthValidator())
{
LengthValidator validator = new
LengthValidator((int)field.getUpperBoundLength());
inputText.addValidator(validator);
}
if(field.isRequiresDoubleRangeValidator())
{
DoubleRangeValidator validator = new
DoubleRangeValidator(field.getUpperBoundDoubleRange(),
field.getLowerBoundDoubleRange());
inputText.addValidator(validator);
}
if(field.isRequiresLongRangeValidator())
{
DoubleRangeValidator validator = new
DoubleRangeValidator(field.getUpperBoundLongRange(),
field.getLowerBoundLongRange());
inputText.addValidator(validator);
}
group.getChildren().add(inputText);
}
text = new HtmlOutputText();
text.setId(field.getKey());
text.setValueBinding("value", valueBinding);
if(field.isEditable())
{
text.setValueBinding("rendered",
field.isOnlyInNewEditable()?notEditNewModeValueBinding:notEditModeValueBinding);
}
else
{
text.setRendered(true);
}
text.setStyleClass("text");
if(!field.isDisplayed())
{
text.setStyle("display:none;");
inputText.setStyle("display:none;");
}
if(field.isUsesAmountConverter())
{
text.setValueBinding("converter", getValueBinding(
"#{converterBean.amountConvt}"));
inputText.setValueBinding("converter", getValueBinding(
"#{converterBean.amountConvt}"));
}
if(field.isUsesBooleanConverter())
{
text.setValueBinding("converter", getValueBinding(
"#{converterBean.booleanOutputConvt}"));
}
if(field.isUsesDateTimeConverter())
{
text.setValueBinding("converter", getValueBinding(
"#{converterBean.dateTimeConvt}"));
inputText.setValueBinding("converter", getValueBinding(
"#{converterBean.dateTimeConvt}"));
}
if(field.isRendersWithBreaks())
{
text.setValueBinding("binding", getValueBinding(
"#{componentBean.outputWithBreaks}"));
}
group.getChildren().add(text);
}
return grid;
}
private ValueBinding getValueBinding(String expression)
{
return new ValueBindingImpl(
FacesContext.getCurrentInstance().getApplication(),
expression);
}
On 5/18/05, Pierrick Samary <[EMAIL PROTECTED]> wrote:
> Thanks Martin for your answer.
>
> Where can i find good examples of manipulation of component in the back-end
> please ?
>
> Regards,
>
> Pierrick.
>
> -----Message d'origine-----
> De : Martin Marinschek [mailto:[EMAIL PROTECTED]
> Envoy� : mardi 17 mai 2005 18:30
> � : MyFaces Discussion
> Objet : Re: EL Limitations
>
> Usually, if you start to need that much dynamisation, you are better off
> using the component binding features of JSF and dynamise the component tree
> in Java.
>
> works like this: binding="#{backingBean.xyComponent}" - and you can do
> whatever you want to initialize your component in the back-end.
>
> regards,
>
> Martin
>
> On 5/17/05, Pierrick Samary <[EMAIL PROTECTED]> wrote:
> >
> >
> >
> > Hello,
> >
> > I have several questions about dynamic programmation with JSF. I open
> > a thread for each one.
> >
> > Is it possible with JSF to use local variables from my page xxx.jsp in
> > an EL expression ? If the answer is "no", is it possible to have the
> > same functionnality by an other way ?
> >
> > Thanks,
> >
> > Pierrick
>
>
