selectbox or combobox - getting nested item set

answered 2012-05-19 00:22:12 +0800

rickcr
704 ● 7

updated 2012-05-19 00:25:13 +0800

I sure hope I can use selectedItem somehow, since I created a lot of mess when I switched to using selectedIndex and it's not elegant...

I have to set the correct selectedDepartmentIndex on my ViewmModel when the user makes a selection of an employee... so you have ugly code like...

@NotifyChange({"selected","selectedDepartmentIndex"})
public void setSelected(Employee selected) {
	logger.debug("setSelected");
	this.selected = selected; 
	if (selected != null && selected.getId() != null) {
		for(int i=0;i<  departments.size();i++) {
			if (departments.get(i).getId() == selected.getDepartment().getId()) {
				this.selectedDepartmentIndex = i;
				break;
			}
		}
	}
}

Then I also need to remember on saving my employee to translate that selected index into the correct value object. (It always worries me using array baed stuff like this, I'd prefer to be handled the real departmentId or even better have it set the real Department item), but anyway I then have...

@NotifyChange({"selected","employees"})
@Command
public void saveEmployee(){
	logger.debug("saveEmployee selected {}", selected);
	selected.setDepartment(departments.get(selectedDepartmentIndex));
	employeeService.saveEmployee(selected);
	this.employees = employeeService.getEmployees();
}

The above seems to be working. Is this a common approach? I'm sure there is a way to get it to work using "selectedItem" so I'd prefer that if possible.

answered 2012-11-22 16:54:58 +0800

rickcr
704 ● 7

updated 2012-11-22 16:57:37 +0800

Hi selement, that code above that I have is from some old stuff pre MVVM approach. If you're using the new approach where you ViewModel backs your zul, it's super easy to get a handle the selected row...

//view model
private Animal selectedAnimal;
private FooBar selectedFooBar; //setter/getter
private List<FooBar> fooBarList;

@NotifyChange("someComboBoxData")
public void setSelectedAnimal(Animal animal) {
    this.selectedAnimal = animal;
    this.fooBarList = service.getFooBars(animal.getId); 
}
    
//zul
<listbox  model="@load(vm.animals)" selectedItem="@bind(vm.selectedAnimall)" ....></listbox>

//bind your combo box to someComboBoxData

<listbox  model="@load(vm.fooBarList)" selectedItem="@bind(vm.selectedFooBar)"
										  rows="1" mold="select">....

Your selectedAnimal method will fire when they select a row. Which will call to get the data you need for the combo box and the combo box is bond to the data to returned so it'll show up.

answered 2012-11-24 15:01:46 +0800

rickcr
704 ● 7

@Selement first can you draw a screen shot or describe a real life example using something like a list of "animals" to describe what you what you want to do?

You want to select a row (click on a row) and then have 'what' exactly happen?

answered 2012-11-25 20:18:05 +0800

rickcr
704 ● 7

Selement..

"I have not got to the point of wiring up the combo box items to load from the department table."

That part is easy. note, the model="@load(vm.departments)" that means I have a getter in my Model class getDepartments(); So in my controller, I do something like

@NotifyChange("departments")
public void getDepartments() {
    if (departments == null) {
        departments = departmentService.getDepartments();
    }
   return departments;
}

In my case my departmentService uses MyBatis to get the departments but that can be anything.. Hibernate, SpringJDBC, hardcoded list, whatever. Not really important.

"Concerning moving to zk MVVM, that requires grails 2.0 I believe. My problem is too many bugs with getting that working with oracle; I am using STS free version which has been a source of problems for me. Not sure if you have code for MVC i.e. that your original post refers too...even though you appear to move to the latter. "

I'm a fan of Groovy but i'm not using Grails. I dont' see how you even benefit using Grails with ZK but maybe there is some, but I don't see it.

I plan on getting to a MyBatis/ZK tutorial online which I think you'll like. It's so simple in my opinion and easy to understand. (Note: I've always preferred MyBatis (formerly iBATIS over Hibernate.. just my personal preference. )

Note, the key to getting the selected item to show up in your combobox regardless of MVVM or straight Composers is to be sure that you set the selectedItem to be the actual object that binds your list for your combobox box. In my second post at the top of this thread I show one way I've done it.

First get your combo list items displaying before you even worry about setting the selected one. It sounds like you haven't even done that yet.