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index.zulzul<zk>
<div viewModel="@id('vm') @init('pkg$.CheckboxGroupVM')">
<forEach items="@init(vm.choices)">
<checkbox checked="
@bind(vm.selection)
@converter(vm.selectionConverter, selection=vm.selection, item=each)
@validator(vm.selectionValidator)"
label="${each}"/>
</forEach>
</div>
</zk>CheckboxGroupVM.javajavaimport org.zkoss.bind.BindContext;
import org.zkoss.bind.Converter;
import org.zkoss.bind.ValidationContext;
import org.zkoss.bind.Validator;
import org.zkoss.bind.validator.AbstractValidator;
import org.zkoss.zk.ui.util.Clients;
import org.zkoss.zul.Checkbox;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
public class CheckboxGroupVM {
private List<String> choices = Arrays.asList("Opt1", "Opt2", "Opt3", "Opt4");
private Set<String> selection = new HashSet<>();
public List<String> getChoices() {
return choices;
}
public Set<String> getSelection() {
return selection;
}
public void setSelection(Set<String> selection) {
this.selection = selection;
}
public Converter getSelectionConverter() {
return new Converter<Boolean, Set<String>, Checkbox>() {
@Override
public Boolean coerceToUi(Set<String> beanProp, Checkbox component, BindContext ctx) {
Set<String> selection = (Set<String>) ctx.getConverterArg("selection");
String item = (String)ctx.getConverterArg("item");
return selection.contains(item);
}
@Override
public Set<String> coerceToBean(Boolean compAttr, Checkbox component, BindContext ctx) {
Set<String> selection = (Set<String>) ctx.getConverterArg("selection");
String item = (String)ctx.getConverterArg("item");
if(compAttr) {
selection.add(item);
} else {
selection.remove(item);
}
return selection;
}
};
}
public Validator getSelectionValidator() {
return new AbstractValidator() {
@Override
public void validate(ValidationContext ctx) {
Clients.log("current selection to validate: " + ctx.getProperty().getValue());
}
};
}
}