th:disabled objects in Thymeleaf

Question

I have a basic SpringBoot 2.0.5.RELEASE app. Using Spring Initializer, JPA, embedded Tomcat, Thymeleaf template engine, and package as an executable JAR file.

I have a select object that is readonly,

<select id="selectInvoiceId" th:field="*{invoice}" th:disabled="${resto.id != null}" >
    <option value="0">PLEASE SELECT AN INVOICE</option>
    <option th:each="invoice : ${invoices}" 
            th:value="${invoice.id}" 
            th:text="${invoice.symbol}">
    </option>
</select>

in the controller I have

@RequestMapping(value = { "/save" }, method = RequestMethod.POST)
public String saveWallet(@Valid @ModelAttribute("wallet") WalletPayload walletPayload, 
    BindingResult bindingResult) {
    ..
}

and in the WalletPayload object I have:

@NotNull
private Invoice invoice;

then I got always an error in the validation because invoice is null, I would like to know if there is a workaround for the readonly objects

I've tried this, but I have still the error:

@RequestMapping(value = { "/save" }, method = RequestMethod.POST)
    public String saveWallet(@Valid @ModelAttribute("wallet") WalletPayload walletPayload,
            BindingResult bindingResult) {


        LOG.debug("WalletPayload walletPayload [ " + walletPayload + " ]");

        if (walletPayload.getId() != null) {
            Invoice fakeInvoine = new Invoice("fake-inv");
            fakeInvoice.setId((long)-1);
            walletPayload.setInvoice(fakeInvoice);
        }


        if (bindingResult.hasErrors()) {
            return serverContextPath + WALLET_LIST_VIEW_NAME;
        }

I also tried to use readonly, but it does not appear as an option on the select object

Answer 1

You should choose to use readonly if you want the values be sent while you don't want the user to be able to edit it.

There is a subtle difference between the use of disabled and readonly

Comparison

• readonly items are not editable, but will be sent when once submited.
• disabled items are not editable and are not sent once submited.
• readonly items are focus-able while disabled one are not.

Answer 2

Use this approach:

When the select element is disabled add a hidden element that sets a fake-invoice to the form so the saveWallet method will get a walletPayload with the non-null fake-invoice.