How to achive no selection in jelly <f:select/>?

Question

In config.jelly, I have:

<f:entry field="field1">
   <f:select/>
</f:entry>

And corresponding java code that fills above components with value:

public ListBoxModel doFillField1Items() {
        ...
}

When the user enters the config page, field field1 is filled with the first value provided by method doFillField1Items().

And my question: Is it a way to configure(either in jelly or java) this <f:select/> component to have initially no selection for field field1.

Answer 1

From HTML point of view there is no such thing as "no selection". <select> tag if has any <option> available then will be selected. Only way that "nothing is selected" is to remove all options from it.

I don't know Jelly but you probably want to achieve code like this:

<select required> <option selected disabled value="">No option selected</option> <option>Option 1</option> <option>Option 2</option> </select>

Code above will tell browser to pre-select option "No option selected", but because it's disabled, then after changing selection user will not be able to choose back "No option selected". Combined required attribute added to <select> and <option value=""> will force user to make a selection (in theory) because otherwise <form> (assuming that you have one) will be ivalid.