Form Input

The form_input component is Vue.js driven child component of the form component and is used to collect user input.

form my_form_config do
  form_input key: :foo, type: :text, #...
end

All child components form_* (including this component) have to be placed within the scope of the parent form component, without any other Vue.js driven component like toggle, async creating a new scope between the child component and the parent form component! Non-Vue.js component can be placed between form and form_* without issues!

# that's working:
form some_form_config do
  form_* key: :foo
  toggle show_on: "some-event" do
    plain "hello!"
  end
end

# that's not working:
form some_form_config do
  toggle show_on: "some-event" do
    form_* key: :foo
  end
end

Parameters

key - required

Defines the key which should be used when posting the form data to the server.

type - required

Pass in as symbol. Defines the type of the input. All HTML input types are supported.

placeholder - optional

Defines the placeholder.

label - optional

Defines the label which will be rendered right before the input tag. You can also use the label component in order to create more complex label structures.

required - optional

If set to true, HTML validations will be triggered on form submit.

init - optional

If given, this value will be the initial value of the input. If used in an edit form of a given ActiveRecord model, the init value will be automatically derived from the model itself.

File Upload

Don't forget to add the multipart: true attribute to your form_config in order to enable file uploads!

In order to perform a single file upload, add this form_input component

form_input key: :some_file, type: :file

In order to perform multiple file uploads, add this form_input component

form_input key: :some_files, type: :file, multiple: true

Don't forget to add the multiple: true attribute to your form_config in order to enable multi file upload!

In order to accept multiple files, you should permit params on your controller like:

some_controller.rb

#...
params.require(:my_form_wrapper_key).permit(
  :some_file,
  some_files: []
)
#...

Please be aware that the form_input components with a type: :file can not be initialized with a given file.

Range Input

Whilst working similiar to the 'text' input, the range input accepts a few more parameters. It accepts also 'min', 'max', 'step', 'list' as optional parameters.

with max, min, step set

form_input id: 'range-input', type: :range, min: 0, max: 100, step: 1

with corresponding datalist

To use a datalist for the range input specify the 'list' parameter with the id of the provided datalist

form_input id: 'range-input', type: :range, list: 'datalist-id'
datalist id: 'datalist-id' do
  option value: 10
  option value: 20
end

Custom Input

If you want to create your own input component, that's easily done since v.1.3.0. Imagine, you want to use flatpickr and therefore need to adjust the input rendering and need to initialize the third party library:

• Create your own Ruby component:

app/matestack/components/my_form_input.rb

class Components::MyFormInput < Matestack::Ui::Core::Form::Input::Base

  vue_js_component_name "my-form-input"

  def prepare
    # optionally add some data here, which will be accessible within your Vue.js component
    @component_config[:foo] = "bar"
  end

  def response
    # exactly one root element is required since this is a Vue.js component template
    div do
      label text: "my form input"
      input input_attributes.merge(class: "flatpickr")
      render_errors
    end
  end

end

• Register your component:

app/matestack/components/registry.rb

module Components::Registry

  Matestack::Ui::Core::Component::Registry.register_components(
    # ...
    my_form_input: Components::MyFormInput,
    # ...
  )

end

• Create the corresponding Vue.js component:

Generic code:

MatestackUiCore.Vue.component('my-form-input', {
  mixins: [MatestackUiCore.componentMixin, MatestackUiCore.formInputMixin],
  data() {
    return {};
  },
  methods: {
    afterInitialize: function(value){
      // optional: if you need to modify the initial value
      // use this.setValue(xyz) in order to change the value
      // this method can be used in other methods or mounted hook of this component as well!
      this.setValue(xyz)
    }
  },
  mounted: function(){
    // use/initialize any third party library here
    // you can access the default initial value via this.componentConfig["init_value"]
    // if you need to, you can access your own component config data which added
    // within the prepare method of the corresponding Ruby class
    // this.componentConfig["foo"] would be "bar" in this case
  }
});

In order to support the flatpickr library, you would do something like this:

app/matestack/componenst/my_form_input.js

MatestackUiCore.Vue.component('my-form-input', {
  mixins: [MatestackUiCore.componentMixin, MatestackUiCore.formInputMixin],
  data() {
    return {};
  },
  mounted: function(){
    // flatpickr needs to be required according to your JS setup
    flatpickr(this.$el.querySelector('.flatpickr'), {
      defaultDate: this.componentConfig["init_value"],
      enableTime: true
    });
  }
});

• Don't forget to require the custom component JavaScript according to your JS setup!

• Finally, use it within a form:

form some_form_config do
  my_form_input key: :foo, type: :text
end