Re: Help!!! Problem with ListEdit component when adding additional rows

[Travis Romney <tr...@inpowered.com>]

You need to make sure that when that page first
starts rendering that your list edit component is not null.
You could try something like this:

public void pageBeginRender(PageEvent pe) {
    if (pe.getRequestCycle().isRewinding()) {
     return;
    }
    if(getListEditMap() == null) {
	setListEditMap(new ListEditMap());
    }
    readPoItem();
   }


Mark.Lomongo@rcgit.com wrote:
> 
> 
> 
> 
> 
> I have a purchase order page and users can add items into it.  I used the
> ListEdit to implement this, if I start with a list of items it works well
> but when I start adding items it displays the following error.  Thanks
> 
> org.apache.tapestry.BindingException
> Unable to update expression 'listEditMap.key' for
> inpowered.stock.warehousing.pages.PurchaseOrderPage$Enhance_20@1896a4c[purchaseorder
>  ] to 133.
> binding:  ExpressionBinding[purchaseorder listEditMap.key]
> location:
> context:/WEB-INF/tapestry/inpowered/stock/warehousing/purchaseorder.page,
> line 39, column 58
> 
> ognl.OgnlException
> target is null for setProperty(null, "key", 133)
> 
> here's the code snippet...
> <property-specification name = "listEditMap" type =
> "org.apache.tapestry.form.ListEditMap" />
> <property-specification name = "poItem" type =
> "inpowered.stock.warehousing.model.PurchaseOrderItemModel" persistent =
> "yes" />
> <component id = "listEdit" type = "ListEdit" >
>     <binding name = "source" expression = "listEditMap.keys" />
>     <binding name = "value" expression = "listEditMap.key" />
>     <static-binding name = "element" value = "tr" />
> <binding name = "listener" expression = "listeners.synchronizePoItem" />
> </component>
> 
>  public abstract ListEditMap getListEditMap();
>  public abstract void setListEditMap(ListEditMap listEditMap);
>  public abstract PurchaseOrderItemModel getPoItem();
>  public abstract void setPoItem(PurchaseOrderItemModel poItem);
>  private ArrayList poItemList = new ArrayList();
> 
>  public void pageBeginRender(PageEvent pe) {
>   if (pe.getRequestCycle().isRewinding()) {
>    return;
>   }
>   readPoItem();
>  }
> 
>  public void addItem(IRequestCycle cycle) {
>      Product product = getProduct();
>      PurchaseOrderItemModel poItem = new PurchaseOrderItemModel();
>      ...
>      poItemList.add(poItem);
>      return;
>     }
> 
>   public void synchronizePoItem(IRequestCycle cycle) {
>     ListEditMap map = getListEditMap();
>     PurchaseOrderItemModel poItem = (PurchaseOrderItemModel)
>     map.getValue();
>     if (poItem == null) {
>       throw new PageRedirectException(this);
>     }
>     setPoItem(poItem);
>   }
> 
>  private void readPoItem() {
>   ListEditMap map = new ListEditMap();
>   int count = Tapestry.size(poItemList);
>   for (int i = 0; i < count; i++) {
>    PurchaseOrderItemModel poim = (PurchaseOrderItemModel) poItemList
>      .get(i);
>    map.add(poim.getProductID(), poim);
>   }
>    setListEditMap(map);
> }
> 
> 
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