Symfony形式：它是否省略了`false``attr`？

Question

I want to know in JavaScript if a particular feature is active or not.

I have a PHP class that has some has* methods.

So, in Twig I do this:

{{ form_widget(form.plan.seo, {'attr': {'class': 'feature', 'data-already-active': store.premium.hasSeo}}) }}

I expect it sets data-already-active to 0 or to 1 depending on the feature is active or not.

But the generated HTML is this if the has* method returns true:

<input type="checkbox" id="form_plan_seo" name="form[plan][seo]" class="feature" data-already-active="data-already-active" value="1" checked="checked">

while simply omits the data-already-active attribute if the has* method returns false:

<input type="checkbox" id="form_plan_social" name="form[plan][social]" class="feature" value="1">

More, has you can see, the value of the attribute data-already-active is not 0 or 1 nor true or false but is the name of the attribute itself:

data-already-active="data-already-active"

Is this normal? Have I a better way of setting this information in the checkbox?

Answer 1

Yep, that seems to be the normal behavior for assigning boolean values for the twig attrs values. An easy workaround would be to modify the code a bit:

{{ form_widget(form.plan.seo, {'attr': {'class': 'feature', 'data-already-active': store.premium.hasSeo ? "1" : "0"}}) }}

or if you want to have this working with your current twig definition you can also move this boolean to string logic into the form template.