[英]Primefaces selectOneMenu converter called but not working
我查看了this和this等其他問題, 問題是調用了convert,但是selectOneMenu的值沒有改變 。 我的實體類已生成,並且具有等於hashCode的值,並且我想不對其進行任何更改-如果重新生成它,則所有更改都將丟失(解決方法是更改實體類的toString)。
XHTML代碼片段:
<p:selectOneMenu id="defid"
value="#{abcController.selected.defid}"
converter="defConverter">
轉換器:
@FacesConverter("defConverter")
public class DefConverter implements Converter
{
private static final Logger LOG = Logger.getLogger(DefConverter.class.getName());
@EJB
private DefFacade defFacade;
@Override
public Object getAsObject(FacesContext fc, UIComponent uic, String string)
{
LOG.info("getAsObject: " + string);
try
{
return defFacade.findWithNFieldsWithValue("name", string, "=").get(0);
}
catch (Exception ex)
{
LOG.log(Level.SEVERE, "Error while fetching Def for " + string, ex);
}
return null;
}
@Override
public String getAsString(FacesContext fc, UIComponent uic, Object obj)
{
LOG.info("getAsString obj class: " + obj.getClass().getName());
if(obj instanceof Def)
{
Def def = (Def)obj;
LOG.info("getAsString def name: " + def.getName());
return def.getName();
}
else
{
StringBuilder sbError = new StringBuilder("The object of class ");
sbError.append(obj.getClass().getName()).append(" is not of Def");
throw new ClassCastException(sbError.toString());
}
}
}
實體類被截斷(生成):
...
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@Column(name = "defid")
private Long defid;
...
@Override
public int hashCode()
{
int hash = 0;
hash += (defid != null ? defid.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object)
{
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof Def))
{
return false;
}
Def other = (Def) object;
if ((this.defid == null && other.defid != null) || (this.defid != null && !this.defid.equals(other.defid)))
{
return false;
}
return true;
}
頁面加載后,我可以看到以下日志語句:
getAsString obj class: com.xyz.Def
getAsString def name: Name 1
getAsString obj class: com.xyz.Def
getAsString def name: Name 2
getAsString obj class: com.xyz.Def
getAsString def name: Name 3
因此,轉換器將被調用並返回正確的值,但在頁面上仍為com.xyz.Def [defid = 1] (向下下拉並正常顯示)
該轉換器似乎正在運行,但是您沒有發布整個<p:selectOneMenu>
代碼,尤其是<f:selectItems>
。 它應該看起來像這樣
<p:selectOneMenu id="defid"
value="#{abcController.selected.defid}"
converter="defConverter">
<f:selectItems value="#{abcController.defs}" var="def"
itemLabel="#{def.name}" itemValue="#{def.defId}" />
</p:selectOneMenu>
itemLabel
負責打印顯示的值。
試試下面的代碼
<p:selectOneMenu id="defid" value="#{abcController.selected.def}"
converter="defConverter">
<f:selectItems value="#{abcController.defs}" var="def"
itemValue="#{def}" itemLabel="#{def.name}" />
</p:selectOneMenu>
Converter用於在復雜的Java對象和String表示形式之間進行轉換。 為此,您需要將整個def對象指定為item值。 您還應確保#{abcController.selected.def}引用的是def屬性,而不是某些表示def ID的Long屬性。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.