Adding items using h:selectManyMenu

Hi BalusC

Thanks for your response.

The following code in Add Role method results in error

public String addRole() {

deviceRoles.addAll(selectedUserRoles);

return null;

}

ERROR:

javax.faces.FacesException: Collection referenced by UISelectItems with binding

'#{test.deviceRoles}' and Component-Path : {Component-Path : [Class:

org.ajax4jsf.framework.ajax.AjaxViewRoot,ViewId: /page.jsp][Class:

javax.faces.component.html.HtmlForm,Id: _id0][Class:

org.ajax4jsf.ajax.html.HtmlAjaxOutputPanel,Id: _id6][Class:

javax.faces.component.html.HtmlPanelGrid,Id: _id13][Class:

javax.faces.component.html.HtmlSelectManyListbox,Id: _id19][Class:

javax.faces.component.UISelectItems,Id: _id20]} <b>does not contain Objects of type

SelectItem

</b>

I fixed the error by hardcoding the values into Add Role method as shown below

public String addRole() {

deviceRoles.add(new SelectItem("10"," Admin"));

deviceRoles.add(new SelectItem("20"," Focal"));

deviceRoles.add(new SelectItem("30","Architect"));

return null;

}

So I guess the call to "selectedUserRoles" in deviceRoles.addAll(selectedUserRoles); should

return instances of SelectItem with Id and Value as arguments.

That means whenever users selects multiple values from user roles select box, the

setselectedUserRoles() method should recieve both Id and Value as instance of Select Item.

Hence i changed the declaration to

private List selectedUserRoles = new ArrayList<SelectItem>();

But not sure how to change the defination of setselectedUserRoles() method to recieve

instances of SelectItem with Id and Value as Arguments. Here is the defination

public void setSelectedUserRoles(List selectedUserRoles) {

this.selectedUserRoles = selectedUserRoles;

System.out.println("Setter this.selectedUserRoles "+ this.selectedUserRoles);//prints

only Id. I wanna print both Id and Value so

that i can pass bot Id and value to device roles

}

Any pointers/suggestions will be highly appreciated in this regard.

Here is the code snippet in backing bean :

--

TestBean.java (Backing Bean)

private List<Role> userRoles;

private List deviceRoles = new ArrayList<SelectItem>();

private List selectedUserRoles = new ArrayList<SelectItem>();

private List selectedDeviceRoles = new ArrayList<SelectItem>();

public List getSelectedUserRoles() {

System.out.println("Getter this.selectedUserRoles"+selectedUserRoles);

return selectedUserRoles;

}

public void setSelectedUserRoles(List selectedUserRoles) {

this.selectedUserRoles = selectedUserRoles;

System.out.println("Setter this.selectedUserRoles "+ this.selectedUserRoles);//prints

only Id. I wanna print both Id and Value so

that i can pass bot Id and value to device roles

}

public String addRole() {

deviceRoles.addAll(selectedUserRoles); //results in error "does not contain Objects

of type SelectItem"

return null;

}

Regards

Bansi

mail2bansia at 2007-7-8 8:47:11 >

Hi BalusC

Thanks for generics. Yep i got the point taken.

Just wanna make sure .....

The method

public void leftToRight() { .....}

should have an argument like

public void leftToRight(selectedItemsLeft) { ......}

And what i am saying is the argument "selectedItemsLeft" shouldn't be of type List<T> . It should be of type List< SelectItem < T, String >>

The reason i say that is Whenever i select items from Left list boxand click on Add button it results in following error

"does not contain Objects of type SelectItem"

I guess what its complaining about is

- selectedItemsLeft, the argument to the method leftToRight() should be instances of SelectItem with Id and Value instead of List<T>

for example new SelectItem("10"," Admin")

Now what i am wondering is how do i change this argument to recieve instances of SelectItem

Please correct me if i am wrong

mail2bansia at 2007-7-8 8:47:11 >

You are perfectly right.

- selectedItemsLeft is already set by the setter

- You have to iterate over the lists yourself to add/remove the items

I am iterating over the selected lists to see what exactly it has and found it to contain only Ids whereas i need both Ids and Values. So how do i change my selected lists to recieve both Ids and Values?

As i will be retrieving the values from Database i am not sure maintaining static instance of a Map with all possible keys and values will work for me

Regards

Bansi

mail2bansia at 2007-7-8 8:47:11 >

Thanks it worked . But resulted in two side effects

1) A click on leftToRight button works fine only for the first time. Subsequent clicks will result in

- Adding selected value from the Left to Right (expected behaviour). But it also removes the older values from Right and adds it back to Left . Meticulously sacnned the code with debugging statements . Still not able to figure out the reason

2) A click on rightToLeft button with only selected values from right results in moving all the values from right to Left and also it clears the right list box

Again scanned the code with debugging statement & figured out

"setSelectedItemsRight" is not called in proper sequence

Any pointers/suggestions will be highly appreciated

Regards

Bansi

mail2bansia at 2007-7-8 8:47:11 >

Hi BalusC,

I used the code that you have talked about in an example for using <h:selectManyListBox> at the following website/forum

http://balusc.xs4all.nl/frm/list_message/21777

But my selectedItemsLeft list is empty eventhough a selection has been made. The backing bean is in the session scope sas mentioned in the example.

What am I doing wrong?

Thank you

TomaHawk-Newbiea at 2007-7-8 8:47:11 >