@BindingParam issue

asked 2017-03-22 04:12:23 +0800

pafi gravatar image pafi
11 1

updated 2017-03-27 02:23:42 +0800

cor3000 gravatar image cor3000
6280 2 7

Hello everyone,

I'm trying to make a simple tree like the example in ZkDemo : "Getting Started > Tree"

Everything is going fine from here until I tried to add a button at the end of each line in the resultGrid line.

I just try to get the click event on the "add cart button" but no matter what I do, in the @Command method "addToCart", "article" is always null !...

My zul :

    <window apply="org.zkoss.bind.BindComposer"
        viewModel="@id('vm') @init('nc.noumea.mairie.appock.viewmodel.ListeCatalogueServiceViewModel')"
        border="none" hflex="1"
        vflex="1" contentStyle="overflow:auto">
    <vlayout vflex="1">
        <hbox hflex="1" vflex="1">
            <tree id="catalogueServiceTree" model="@bind(vm.catalogueTree)"
                  itemRenderer="@bind(vm.catalogueTreeitemRenderer)" width="400px" vflex="1">
                    <treecol label="Libellé"/>
                    <treecol label="Nombre" align="center" width="80px"/>
            <listbox id="resultCatalogueServiceTreeGrid" width="100%" vflex="1">
                <listhead menupopup="auto" sizable="true">
                    <listheader label="Photo" width="100px" align="center"/>
                    <listheader label="Référence" sort="auto(reference)" width="150px"/>
                    <listheader label="Libellé" sort="auto(libelle)" hflex="1"/>
                    <listheader label="Colisage" sort="auto(quantiteColisage)" width="80px"/>
                    <listheader label="" width="55px" align="center"/>
                <template name="model">
                            <image src="${each.photoSrc}"/>
                            <label value="${each.reference}"/>
                            <label value="${each.libelle}"/>
                            <label value="${each.libelleColisage}"/>
                            <button iconSclass="z-icon-cart-plus" onClick="@command('addToCart', article=each)"/>

And my View :

public class ListeCatalogueServiceViewModel extends AbstractListeViewModel<Catalogue> implements Serializable {
    private static final long                   serialVersionUID    = 1L;

    CatalogueService                            catalogueService;

    private TreeModel<CatalogueTreeNode>        catalogueTree;

    private TreeitemRenderer<CatalogueTreeNode> catalogueTreeitemRenderer;

    private Listbox                             resultGrid;

    public void afterCompose(@ContextParam(ContextType.VIEW) Component view) {
        Selectors.wireComponents(view, this, false);

    @Init(superclass = true)
    public void initTree() throws IOException {

        Catalogue catalogue = catalogueService.findActif();
        if (catalogue == null) {
            Messagebox.show("Il n'existe pas de catalogue actif à afficher", "Erreur", Messagebox.OK, Messagebox.ERROR);


    public TreeModel<CatalogueTreeNode> getCatalogueTree() {
        return catalogueTree;

    public void setCatalogueTree(TreeModel<CatalogueTreeNode> catalogueTree) {
        this.catalogueTree = catalogueTree;

    private void initCatalogueTreeModel(Catalogue catalogue) throws IOException {
        setCatalogueTree(new CatalogueTreeModel(getCatalogueTreeRoot(catalogue)));

    private CatalogueTreeNode getCatalogueTreeRoot(Catalogue catalogue) throws IOException {
        return catalogueService.getCatalogueTreeRoot(catalogue);

    public TreeitemRenderer<CatalogueTreeNode> getCatalogueTreeitemRenderer() {
        if (catalogueTreeitemRenderer == null) {
            catalogueTreeitemRenderer = new TreeitemRenderer<CatalogueTreeNode>() {
                public void render(Treeitem treeitem, CatalogueTreeNode catalogueTreeNode, int i) throws Exception {
                    Treerow dataRow = new Treerow();

                    Treecell treecellLabel = new Treecell(catalogueTreeNode.getLibelle());
                    dataRow.addEventListener(Events.ON_CLICK, new EventListener<Event>() {
                        public void onEvent(Event event) throws Exception {
                            CatalogueTreeNode selectedNodeValue = ((Treeitem) event.getTarget().getParent()).getValue();

                            if (selectedNodeValue.getTypeCatalogueNode() == TypeCatalogueNode.FAMILLE) {
                                resultGrid.setModel(new ListModelList<>(((SousFamille) selectedNodeValue.getEntity()).getListeArticle()));

                    Treecell treecellNombreArticle = new Treecell(String.valueOf(catalogueTreeNode.getNombreArticle()));

        return catalogueTreeitemRenderer;

    public void setCatalogueTreeitemRenderer(TreeitemRenderer<CatalogueTreeNode> catalogueTreeitemRenderer) {
        this.catalogueTreeitemRenderer = catalogueTreeitemRenderer;

    public void addToCart(@BindingParam("article") Article article) {
        if (article == null) {

I'm not new to ZK and I usually find what is wrong but here I'm stuck for hours looking on forum and so...:(

Thank you for your help !

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as much as I"d like to help the problem is that your example is not runnable without the dependent classes. Can you please simplify the problem and post a runnable example on zkfiddle. I can then have a look and give advice more quickly. Robert

cor3000 ( 2017-03-27 02:29:20 +0800 )edit

1 Answer

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answered 2017-03-27 02:37:59 +0800

cor3000 gravatar image cor3000
6280 2 7

updated 2017-03-27 02:41:44 +0800

out of my head I'd say you are mixing the mvvm and mvc patterns. When using mvc some mvvm mechanisms don't initialize and I assume that's why the each variable resolves to null when used in a dynamic command binding inside a listitem generated without any mvvm bindings.

Usually there should be a model="@init(vm.somemodel)" to initialize the model binding which I am missing here (I see you are setting this manually in your code... in the MVC way, not wrong - just not doing the extra bits).

If you can't switch to pure MVVM you can store the each variable in a custom-attribute at listitem scope and use this during the command binding.

            <template name="model">
                    <custom-attribute myarticle="${each}"/>
                        <button iconSclass="z-icon-cart-plus"
                                onClick="@command('addToCart', article=myarticle)"/>

As said just out-of-my-head ... if this doesn't help, please provide a running example on zkfiddle.

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Asked: 2017-03-22 04:12:23 +0800

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Last updated: Mar 27 '17

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