Listbox Renderer"
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Here we describe how to implement a custom renderer for a listbox (<javadoc type="interface">org.zkoss.zul.ListitemRenderer</javadoc>). For the concepts about component, model and renderer, please refer to [[ZK_Developer's_Reference/MVC/Model/List_Model#Model-driven_Display|the Model-driven Display section]]. | Here we describe how to implement a custom renderer for a listbox (<javadoc type="interface">org.zkoss.zul.ListitemRenderer</javadoc>). For the concepts about component, model and renderer, please refer to [[ZK_Developer's_Reference/MVC/Model/List_Model#Model-driven_Display|the Model-driven Display section]]. | ||
| − | When a listbox (<javadoc>org.zkoss.zul.Listbox</javadoc>) is assigned with a model, a default renderer is assigned too. The default renderer will assume that each list item has only one column, and it converts the data into a string directly<ref>If the listbox is assigned a template called < | + | When a listbox (<javadoc>org.zkoss.zul.Listbox</javadoc>) is assigned with a model, a default renderer is assigned too. The default renderer will assume that each list item has only one column, and it converts the data into a string directly<ref>If the listbox is assigned a template called <code>model</code>, then the template will be used to render the listbox. For more information, please refer to [[ZK Developer's Reference/MVC/View/Template/Listbox Template|the Listbox 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.ListitemRenderer</javadoc> to handle the rendering. |
For example, | For example, | ||
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=Version History= | =Version History= | ||
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! Version !! Date !! Content | ! Version !! Date !! Content | ||
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Latest revision as of 07:34, 8 July 2022
Here we describe how to implement a custom renderer for a listbox (ListitemRenderer). For the concepts about component, model and renderer, please refer to the Model-driven Display section.
When a listbox (Listbox) is assigned with a model, a default renderer is assigned too. The default renderer will assume that each list item has only one column, and it converts the data into a string directly[1]. If you want to display multiple columns or retrieve a particular field of the data, you have to implement ListitemRenderer to handle the rendering.
For example,
public class MyRenderer implements ListitemRenderer{
public void render(Listitem listitem, Object data, int index) {
Listcell cell = new Listcell();
listitem.appendChild(cell);
if (data instanceof String[]){
cell.appendChild(new Label(((String[])data)[0].toString()));
} else if (data instanceof String){
cell.appendChild(new Label(data.toString()));
} else {
cell.appendChild(new Label("UNKNOW:"+data.toString()));
}
}
}
- ↑ If the listbox is assigned a template called
model, then the template will be used to render the listbox. For more information, please refer to the Listbox Template section.
Version History
| Version | Date | Content |
|---|---|---|
| 6.0.0 | February 2012 | The index argument was introduced. |