Tree Renderer"
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| − | When a tree (<javadoc>org.zkoss.zul.Tree</javadoc>) is assigned with a model, a default renderer is assigned too<ref>For the concept about component, model and renderer, please refer to [[ZK_Developer's_Reference/MVC/Model/List_Model#Model-driven_Display|the Model-driven Display section]].</ref>. The default renderer will assume that each tree item has only one column, and it converts the data into a string directly<ref>If the tree is assigned a template called < | + | When a tree (<javadoc>org.zkoss.zul.Tree</javadoc>) is assigned with a model, a default renderer is assigned too<ref>For the concept about component, model and renderer, please refer to [[ZK_Developer's_Reference/MVC/Model/List_Model#Model-driven_Display|the Model-driven Display section]].</ref>. The default renderer will assume that each tree item has only one column, and it converts the data into a string directly<ref>If the tree is assigned a template called <code>model</code>, then the template will be used to render the tree. For more information, please refer to [[ZK Developer's Reference/MVC/View/Template/Tree Template|the Tree Template section]].</ref>. If you want to display multiple columns or retrieve a particular field of the data, you have to implement <javadoc type="interface">org.zkoss.zul.TreeitemRenderer</javadoc> to handle the rendering. |
For example, | For example, | ||
Revision as of 14:12, 12 January 2022
When a tree (Tree) is assigned with a model, a default renderer is assigned too[1]. The default renderer will assume that each tree item has only one column, and it converts the data into a string directly[2]. If you want to display multiple columns or retrieve a particular field of the data, you have to implement TreeitemRenderer to handle the rendering.
For example,
public class HostTreeRenderer implements TreeitemRenderer {
public void render(Treeitem treeitem, Object data, int index) throws Exception {
Treerow row = treeitem.getTreerow();
if (row == null) { // tree row not create yet.
row = new Treerow();
treeitem.appendChild(row);
}
if (data instanceof HostTreeModel.FakeGroup) {
treeitem.getTreerow().appendChild(new Treecell(((HostTreeModel.FakeGroup)data).getName()));
} else if (data instanceof HostTreeModel.FakeHost) {
treeitem.getTreerow().appendChild(new Treecell(((HostTreeModel.FakeHost)data).getName()));
} else if (data instanceof HostTreeModel.FakeProcess) {
treeitem.getTreerow().appendChild(new Treecell(((HostTreeModel.FakeProcess)data).getName()));
}
}
}
- ↑ For the concept about component, model and renderer, please refer to the Model-driven Display section.
- ↑ If the tree is assigned a template called
model, then the template will be used to render the tree. For more information, please refer to the Tree Template section.
Version History
| Version | Date | Content |
|---|---|---|
| 6.0.0 | February 2012 | The index argument was introduced. |