Binding.scala: how to define checked in a Checkbox

Question

I want to define a checkbox in Binding.scala, like:

 <input type="checkbox"
             checked={elem.checked}
             />

elem.checked can have any String value (even an empty):the checkbox is always checked.

How can I get

 <input type="checkbox"
             checked/>

if checked, resp.

 <input type="checkbox"/>

if not.

Yang Bo · Accepted Answer · 2018-12-15 11:26:46Z

1

According to https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#boolean-attributes , in XHTML 5, any text values means true.

Fortunately, Binding.scala XML literals allows attributes of Boolean type. If elem.checked is false (not "false"), the attribute will be removed.

answered Dec 15, 2018 at 11:26

Yang Bo

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4 Comments

pme Over a year ago

thanks that works, only confusing thing is that the checkbox does not have a checked attribute when checked=true (in the inspector) see scalafiddle.io/sf/81rACVu/0

Yang Bo Over a year ago

checked={true} set the property checked of the <input>, while checked="checked" set the attribute checked.

Yang Bo Over a year ago

The property defaultChecked is mapped to the attribute `checked.

Yang Bo Over a year ago

The property checked is not mapped to any attribute.

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