CODEWITHSUNDEEP
jsfprimefacesdatatable
Shelly
Shelly

Reputation: 1035

Using rowKey in primefaces dataTable with new entity

Well, I know that i must choose a field from my object that is unique, like a ID. Then my rowKey is "item.id". This works fine when load all itens in a dataTable, but if I add a new item (this object didn't persisted in database yet) with null ID, it don't apper in my dataTable.

What is the solution for this ? I just can use ID as a rowKey but sometimes i need add a new object with NULL ID (because this is didn't persisted on database yet).

Look my code:

<p:dataTable rowKey="#{item.id}" var="item"
                    value="#{orcamentoMB.itens}"
                    emptyMessage="Não foi encontrado nenhum registro"
                    id="dataTableItens"
                    selection="#{orcamentoMB.selectedItemOrcamento}"
                    selectionMode="single" rowIndexVar="rowIndex"
                    rowStyleClass="#{(rowIndex mod 2) eq 0 ? 'first-row' : 'second-row'}">

Upvotes: 6

Views: 18442

Answers (3)

Eduard Drenth
Eduard Drenth

Reputation: 53

This is not an answer, but a comment to proposed solutions.

Keep in mind that you may end up with non unique rowKeys. For that reason I decided to use -1 as rowkey for a new row and to accept only one new row at the time, hope this helps.

Upvotes: -1

jbbarquero
jbbarquero

Reputation: 2842

If you're not using EL 2.2, so that you can't call methods, you can create a method in your Item class for obtaining a unique ID to be used as rowKey, for instance:

public int getRowKey() { return this.hashCode(); }

And then you can use in the JSF page:

rowKey="#{item.rowKey}"

Upvotes: 2

BalusC
BalusC

Reputation: 1108782

Use another unique identifier then. Perhaps the hashCode() or even the toString()?

rowKey="#{not empty item.id ? item.id : item.hashCode()}"

Upvotes: 12

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