Play 2.3.4 Java, select element of form: setting the chosen one

[John Gateley]

Hi,

This is Play 2.3.4, with Java.

I have a form with a select element:

    @form(action = ...) {

        Select field:

        @helper.select(field = myForm("myField"), options(Seq("Foo", "Bar")))

...

How can I specify which element is selected when the form is first displayed?

This is a short example, but in a longer form, where the select field has many values to choose from, I need to be able to set the value that is displayed (like for handling errors).

Thanks

John

[Mateusz Lisik]

According to source of helper (https://github.com/playframework/playframework/blob/master/framework/src/play/src/main/scala/views/helper/select.scala.html) you should define _default arg.

Pozdrawiam,
Mateusz Lisik

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[John Gateley]

Thanks for the response.

Unfortunately, this does not respect the order of the <option> elements.

The default is more appropriate for a header like "Choose one of the cities below", but if you have cities in alphabetical order, the _default city is not in the proper order.

As a side note, the _defaul argument should not appear in the list of options, or it will show up twice.

Any other ideas?

Thanks again

John

[jaybytez]

You could just pre-populate your field in your form object with the default value if you are passing that into your template. 

https://www.playframework.com/documentation/2.3.x/JavaForms

jay

[John Gateley]

Hi Jay,

I've tried this, in a couple of different ways, but it doesn't seem to work. Likely that I'm doing something wrong, but I'm not sure what.

I've been using a for loop to generate the options, and passing the selected option in as a parameter:

        @for(value <- values) {

            <option value="@value" @if(value == selectedValue) { selected }>

            @value

            </option>

        }

This works, but isn't elegant.

John

[Mateusz Lisik]

Hi.

Select helper will add "selected" attribute to option that is set in your model. Recently I've had something like this:

        @helper.select(book("language"), options = helper.options(commons.LanguageHelper.getLanguages), args = '_showConstraints -> false,

            '_label -> "Language",

            'class -> "form-control",

            'placeholder -> "(Required) Select language of your book",

            'required -> true

        )

getLanguages returns Map<String, String> so if Map Key equals book.language then it will be marked as selected and wont be placed as first item.

Pozdrawiam,
Mateusz Lisik

[John Gateley]

Thank you Mateusz, that helped.

I needed options in order, so the map wouldn't work, but I found out that using helper.options with a list could do the same. Then the value in the form must be the option that appears in the list.

John

[virtualeyes]

To force a selected value you need to do something like:

field = form("foo").copy(value = form("foo").value.getOrElse(Some(/*default value*/)))

Kind of boilerplate-y but I believe that's the only way to pre-select an option element when a play form has no bound value for the target field (e.g. on create event).

p.s. if above doesn't compile, add yet more boilerplate ;-)

field = form("foo").copy(value = form("foo").value.map(Some(_)).getOrElse(Some(/*default value*/)))