PrologAllowed (zk 10.0.0 API)

All Known Implementing Classes:

Audio.ExtraCtrl, Chosenbox.ExtraCtrl, Combobox.ExtraCtrl, Cropper.ExtraCtrl, Datebox.ExtraCtrl, Grid.ExtraCtrl, HtmlBasedComponent.ExtraCtrl, HtmlNativeComponent.ExtraCtrl, Iframe.ExtraCtrl, Image.ExtraCtrl, Jasperreport.ExtraCtrl, LabelImageElement.ExtraCtrl, Lineitem.ExtraCtrl, Listbox.ExtraCtrl, Listitem.ExtraCtrl, Pdfviewer.ExtraCtrl, Row.ExtraCtrl, Rows.ExtraCtrl, Selectbox.ExtraCtrl, Treechildren.ExtraCtrl, Video.ExtraCtrl
```
public interface PrologAllowed
```
Implemented by the object returned by ComponentCtrl.getExtraCtrl() if it is able to generate the specified prolog before its real content.
It is used by ZK to minimize the output. Currently, HtmlBasedComponent supports it. If a ZUML page has a string consisting of whitespaces, it will ask the following component to generate them if PrologAllowed is implemented.
For example, in the following codes, the whitespace between textbox and datebox won't be converted to a label component. Rather, it will ask datebox to generate by calling datebox's setPrologContent(java.lang.String).
```
<textbox/> <datebox/>
```
Since:

3.5.0

Author:

tomyeh

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  void setPrologContent(java.lang.String prolog)
  Sets the prolog content.

- Method Detail
  - setPrologContent
```
void setPrologContent(java.lang.String prolog)
```
    Sets the prolog content. It is the content generated before the child components, if any.
    Default: none.
    Note: the prolog is one-shot only. Once the component is generated, the prolog is gone.