Linkage between form controls

[KeruKaikai]

demand：Two form controls，Linkage between form controls
Type: pull-down selection,
Product category: pull-down selection, (the initial state is hidden)
After selecting the type, a request is sent to the background. If the type has optional product classification, the product classification will be displayed

[xaboy]

Not built in, but can be implemented manually (Google translation)
type: typeRule
Product category: ProductCategoryRule

typeRule.event.change = ()=>{
    request('api').then((options)=>{
       if(options.length)
            ProductCategoryRule.options = options
        else
            ProductCategoryRule.props.hidden = true //OR $f.hidden(ProductCategoryRule.field)
    })
}