THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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1. When the number of line items is known
If you are using JSP:
the cart.jsp file in altSyntax
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<ww:iterator value="cart.items">
<ww:hidden name="cart.items[%{#rowstatus.index}].productId" value="%{productId}">
<ww:textfield name="cart.items[%{#rowstatus.index}].qty" value="%{qty}" />
<ww:textfield name="cart.items[%{#rowstatus.index}].note" value="%{note}" />
</ww:iterator>
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the cart.jsp file (non altSyntax)
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<ww:iterator value="cart.items">
<ww:hidden name="'cart.items[' + #rowstatus.index + '].productId'" value="productId">
<ww:textfield name="'cart.items[' + #rowstatus.index + '].qty'" value="qty" />
<ww:textfield name="'cart.items[' + #rowstatus.index + '].note'" value="note" />
</ww:iterator>
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Alternatively, if you use Velocity as your view technology of choice:
the cart.vm file
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#foreach ( $item in $cart.items ) #set($index = $velocityCount - 1) <input type="hidden" name="cart.items[$index].productId" value="$item.productId"> <input type="text" name="cart.items[$index].qty" value="$item.qty"> <input type="text" name="cart.items[$index].note" value="$item.note"> #end |
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public class UpdateCartAction extends ActionSupport {
public Cart getCart() {
// Lazy initialization
Cart result = ActionContext.getContext().getSession.get("cart.key");
if ( result == null ) {
return
result = new Cart();
ActionContext.getContext().getSession.put("cart.key", result);
}
return result;
}
public String execute() throws Exception {
// Just ensuring our cart is initialized...
Cart cart = getCart();
// loop through a
}
}
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public class CartItem implements Serializable {
private int qty;
private int productId;
private String note;
// getters/setters...
}
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Explanation
The resulting vm file html code is rendered as
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<input type="hidden" name="cart.items[0].qty.productId" value="1"> <input type="text" name="cart.items[0].qty" value="2"> <input type="text" name="cart.items[0].note" value="This is a fun book!"> <input type="hidden" name="cart.items[1].qty.productId" value="2"> <input type="text" name="cart.items[1].qty" value="2"> <input type="text" name="cart.items[1].note" value="You love this one"> <input type="hidden" name="cart.items[2].qty.productId" value="3"> <input type="text" name="cart.items[2].qty" value="$item.qty"> <input type="text" name="cart.items[2].note" value=""> |
Webwork will populate all the entries in Cart with the correct values.
In depth, the ParametersInterceptor would apply the form results to our model, leading to the call similar like
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((CartItem) updateCartAction.getCart().getItems().get(0)).setProductId(1);
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for the first shown line in the rendered result.
2. When the number of line items is unknown
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