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Hide/Show components based on listbox selection, using MVVM

asked 2021-04-23 21:25:30 +0800

gscreddy gravatar image gscreddy
1

Based on the value we select in the listbox, few textboxes needs to be shown and few textboxes needs to be hidden. How can we handle this using MVVM Approach?

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answered 2021-04-26 14:48:34 +0800

hawk gravatar image hawk
2785 1 5
http://hawkphoenix.blogsp... ZK Team

Demonstrate the idea with a simple example:

<div viewModel="@id('vm')@init('org.zkoss.mvvm.viewmodel.HideVM')">
    <listbox model="@init(vm.model)" onSelect="@command('update')"/>
    <textbox placeholder="group1" visible="@load(vm.group1Visible)"/>
    <textbox placeholder="group2" visible="@load(vm.group2Visible)"/>
</div>



public class HideVM {
    private ListModelList<String> model = new ListModelList<>();
    private boolean group1Visible;
    private boolean group2Visible;

    public HideVM(){
        model.add("group1");
        model.add("group2");
    }

    @Command @NotifyChange({"group1Visible", "group2Visible"})
    public void update(){
        String selectedItem = model.getSelection().iterator().next();

        //determine the rule to update visibility
        if (selectedItem.contains("group1")){
            group1Visible = true;
            group2Visible = false;
        }else {
            group1Visible = false;
            group2Visible = true;
        }
    }
    //omit setter
}
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Asked: 2021-04-23 21:25:30 +0800

Seen: 7 times

Last updated: Apr 26

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