TYPO3 Core

The Select element has a couple of options available in Fluid which are not taken into account by the Form Wizard.

From sysext:form, version 7.6.0, form/Resources/Private/Partials/Default/Show/FlatElements/Select.html:

<form:select
    class="{model.additionalArguments.class}" 
    dir="{model.additionalArguments.dir}" 
    id="{model.additionalArguments.id}" 
    lang="{model.additionalArguments.lang}" 
    style="{model.additionalArguments.style}" 
    title="{model.additionalArguments.title}" 
    accesskey="{model.additionalArguments.accesskey}" 
    tabindex="{model.additionalArguments.tabindex}" 
    onclick="{model.additionalArguments.onclick}" 

    name="{model.additionalArguments.prefix}[{model.additionalArguments.name}]" 
    value="{form:aggregateSelectOptions(model:model, returnSelectedValues: 1)}" 

    multiple="{model.additionalArguments.multiple}" 
    size="{model.additionalArguments.size}" 

    optionLabelField="label" 
    optionValueField="value" 
    options="{form:aggregateSelectOptions(model:model)}" 
    prependOptionLabel="{model.additionalArguments.prependOptionLabel}" 
    prependOptionValue="{model.additionalArguments.prependOptionValue}" 
    selectAllByDefault="{model.additionalArguments.selectAllByDefault}" 
    sortByOptionLabel="{model.additionalArguments.sortByOptionLabel}" 

    errorClass="{model.additionalArguments.errorClass}" 
    additionalAttributes="{model.htmlAttributes}" 
/>

For example you can add the TypoScript options prependOptionLabel and prependOptionValue:

10 = SELECT
10 {
    name = country
    label {
        value = Country
    }
    prependOptionLabel = Please Select
    prependOptionValue =
    10 = OPTION
    10 {
        text = Some Country
        value = some_country_code
    }
}

This is working fine but as soon as you open and save the form with the wizard, it will discard those options.

Especially for those two options it is kind of important to have them taken into account by the wizard because they can be used to insert a blank option to a select box. This is not possible within the wizard because options without a value will get a number as value automatically later on (which is fine, I guess, since we have this prependOption options). Without such a possibility making a select box required doesn't make any sense because there can't be an option with an empty value.

It would be even cooler if the wizard would also support these options so that you can set them inside instead of setting them in the TypoScript.

(Also, I haven't had a look at the other options - like selectAllByDefault - but it might be a good idea to support them in the wizard as well.)

PS: I have reported a similar bug/feature request in the past. Maybe this is helping somehow. #64532, #69409