JSF 'total' variable something like c:set in JSTL

Question

I don't like JSF but I need to solve this problem with it, I am working in "pure" JSF. So this is what I baisicly need but I don't know how to accomplish it with JSF:

<c:set var="total" value="0"></c:set>

<c:forEach var="item" items="${cart}">
    <tr>
        <td>${item.product.name}</td>
        <td>${item.product.price}</td>
        <td>${item.quantity}</td>
        <td>${item.product.price * item.quantity}</td>
    </tr>
    <c:set var="total" value="${total + item.product.price * item.quantity}"></c:set>
</c:forEach>

Now I can display total value with simple ${total} as u know.

My JSF table looks like this:

    <h:dataTable var="item" value="#{mbProducts.cart_items}" binding="#{mbProducts.tableComponent}" border="1">

        <h:column>
            <f:facet name="header">
                <h:outputText value="NAME" />
            </f:facet>

            <h:outputText value="#{item.product.name}" />
        </h:column>

        <h:column>
            <f:facet name="header">
                <h:outputText value="PRICE" />
            </f:facet>

            <h:outputText value="#{item.product.price}" />
        </h:column>

        <h:column>
            <f:facet name="header">
                <h:outputText value="NUM" />
            </f:facet>

            <h:outputText value="#{item.quantity}" />
        </h:column>

        <h:column>
            <f:facet name="header">
                <h:outputText value="TOTAL PRICE" />
            </f:facet>

            <h:outputText value="#{item.product.price * item.quantity}"/>
        </h:column>

    </h:dataTable>

But I don't know how to set total variable which will be increased in each iteration? How to solve this?!

Answer 1

why dont you just do the calculation in the backing bean and just use jsf to retreive it?

And to answer your question, i don't know of a possiblity to set variables using just JSF libraries.

Answer 2

有趣的细节 - <c:set>标签将在JSF 2.0 中可用。

Answer 3

you are mixing tree build time tags vs rendertime tags at the same time. replace c:forEach with ui:repeat see here c:foreach vs ui:repeat