Sometimes you need a way to enter tabular data such as list of quantity for products in a shopping cart, marks from a list of examination candiates, etc. If you just have one input value per line item, you can use a HashMap to store the value. This can be expanded to support multiple input values by having multiple HashMap. This describes a number of alternatives using some of more advanced features of WebWork. Assume you want to capture the quantity and a gift note for a list of products in a shopping cart (i.e Amazon).
1.
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When the number of line items is known
the cart.vm file
Code Block |
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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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Webwork will populate all the entries in Cart with the correct values.
2.
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When the number of line items is unknown
For example, you want to allow the user to enter any number of ISBN, quanty and a note. You can replace ArrayList with XWorkList, which will automatically create new items if the index is greater than the size of the list.
3. Use
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Type Conversion
If you want more advanced way to do this, check out Null Property Access for type conversion.