Radio

The radiobuttons field displays any number of radio buttons in a list. This is perfect if you have a predefined number of options, from which the user can just choose one.

Example

fields:
  category:
    label: Category
    type: radio
    options:
      design: Design
      architecture: Architecture
      photography: Photography
      3d: 3D
      web: Web

Field properties

Default value

By default, the first item in the list of options is preselected. To change the default value:

fields:
  category:
    label: Category
    type: radio
    default: architecture
    options:
      design: Design
      architecture: Architecture
      photography: Photography
      3d: 3D
      web: Web

To prevent preselection of a value, set default: false.

Dynamic options

Our options query syntax offers a very powerful way of converting pages, files, users, page values and even items in structure fields into automatically generated option lists.

Option queries

fields:
  category:
    label: Category
    type: radio
    options: query
    query: site.children.published

The example above will turn all published main pages of the site into options. The title of each page will be used as the text of the option and the page id will be used as the stored value.

A few more examples

query: site.children.template("project").limit(10)
query: page.images.offset(2)
query: users.filterBy("role", "admin").sortBy("name", "desc")
query: page.links.toStructure

You can start at the site, current page, users collection or the kirby instance to run your query. The result must be a collection of pages, files, users or a structure object

query: site.index.filterBy("template", "in", ["note", "album"]);
query: kirby.collection("some-collection").not(kirby.collection("excluded-collection"))

Getting options from all siblings or the index

query: page.siblings.pluck("tags", ",", true)
query: page.index.pluck("tags", ",", true)
query: site.index.pluck("tags", ",", true)

Custom text and value

To customize the displayed text or the stored value, you can be more specific when defining the query: The query option gets three suboptions, where fetch takes over the options query. text and value can be defined with the help of our string template language to get exactly what you want as the result.

category:
  label: Category
  type: radio
  options: query
  query:
    fetch: site.children.published
    text: "{{ page.year }}"
    value: "{{ page.slug }}"

As in the example above, all custom fields of a page can be accessed. You can even combine fields and use field methods:

category:
  label: Category
  type: radio
  options: query
  query:
    fetch: site.children.published
    text: "{{ page.year }} - {{ page.title.upper }}"
    value: "{{ page.slug }}"

Numeric keys

If you want to store numeric keys as values, you have to use the long notation with value and text:

fields:
  category:
    label: Category
    type: radio
    options:
      - value: '100'
        text: Design
      - value: '200'
        text: Architecture

Options from other fields

With a query it is not only possible to fetch options from pages, users, files or structure fields. You can also split comma-separated values of fields such as tags or checkboxes in order to create options from the result array.

category:
  label: Category
  type: radio
  options: query
  query: site.taxonomy.split

Of course you get the same flexibility with those array values, to modify the result text and stored value. Each item in the array will automatically be converted into an object with a key and value property. Those properties are regular Kirby content fields and you can use all field methods to work with them further. Items in the array need to be referenced as arrayItem

category:
  label: Category
  type: radio
  options: query
  query:
    fetch: site.taxonomy.split
    text: "{{ arrayItem.value.upper }}"
    value: "{{ arrayItem.value.slug }}"

A custom separator

If the values in a field are separated by something other than a comma, you can of course specify this as well in the query.

category:
  label: Category
  type: radio
  options: query
  query: page.categories.split(";")

Options from structure field

To fetch options from a structure field, you can use the toStructure method and then fetch the text and value from the fields of the structure items:

Assuming we have a structure field like this:

twitter:
  label: Follow the Kirby Team on Twitter …
  type: structure
  fields:
    name:
      label: Team Member
      type: text
    twitter:
      label: Twitter Username
      type: text

We can fetch the fields by using the keyword structureItem:

category:
  label: Category
  type: radio
  options: query
  query:
    fetch: site.contactoptions.toStructure
    text: "{{ structureItem.name }}"
    value: "{{ structureItem.twitter }}"

Options via API

If the option queries are not enough or you need to pluck an external source for option data, you can use the API setting.

category:
  label: Category
  type: radio
  options: api
  api: https://your-options-api.com/options.json

By default, the API setting expects that the JSON endpoint returns an option array as shown above in the manual option setting.

You can be much more specific with the endpoint though and describe which kind of data to fetch and what to convert to text and value - pretty much as with the option queries.

A simple company list example

Let's assume that our JSON endpoint returns the following JSON:

{
  "Companies": [
    {"name": "Apple"},
    {"name": "Intel"},
    {"name": "Microsoft"}
  ]
}

As you can see, the format doesn't follow our expected option format at all. We first need to go down to the companies property and then somehow convert each company object into text and value for the options.

This can be done with our template language:

category:
  label: Category
  type: radio
  options: api
  api:
    url: https://example.com/companies.json
    fetch: Companies
    text: "{{ item.name }}"
    value: "{{ item.name.slug }}"

With the fetch attribute we can define where to start in the JSON document. This can even go down nested structures or sort entries:

fetch: Companies.sortBy("name", "desc")

The JSON document is turned into a Kirby structure and thus can be queried and manipulated just like any other data within Kirby.

Afterwards the text and value setting can be modified by defining the template for each item.

Again, each item is being converted to a Kirby object and every property of the object is a typical Kirby field with all the available field methods. We can go pretty wild with this, if we want. Let's just assume we have a little bit more data for each company …

{
  "Companies": [
    {
      "name": "Apple",
      "products": [
        {"name": "MacBook"},
        {"name": "iPhone"},
        {"name": "iPad"}
      ]
    },
    {
      "name": "Intel",
      "products": [
        {"name": "Intel Core something"}
      ]
    },
    {
      "name": "Microsoft",
      "products": [
        {"name": "Windows"},
        {"name": "Hololens"},
        {"name": "Xbox"}
      ]
    }
  ]
}

value: "{{ item.name.slug.upper }}"
text: "{{ item.name }} - Products: {{ item.products.count }}"

This would produce the following PHP array of options:

[
  value: 'APPLE',
  text: 'Apple - Products: 3'
],
[
  value: 'INTEL',
  text: 'Intel - Products: 1'
],
[
  value: 'MICROSOFT',
  text: 'Microsoft - Products: 3'
]

Dynamic API URLs

Instead of hard-coding an absolute URL into your blueprint, it's often better to have more control over the API URL. Especially when you are working with different environments (ie. local, staging, production)

The URL option of the API setup can also be modified by using the string template language:

category:
  label: Category
  type: radio
  options: api
  api:
    url: "{{ site.url }}/my-api/companies.json"
    fetch: Companies
    text: "{{ item.name }}"
    value: "{{ item.name.slug }}"

With this simple addition, the API URL will always refer to the main URL of the site. You can also access the configuration instead to get even more flexibility

url: "{{ kirby.option('optionApiUrl') }}/companies.json"

How to use in templates/snippets

To only render the value stored in the content file, call the field name:

<?= $page->category() ?>

If your saved values are lowercase versions of the text shown to the user, you might want to uppercase the first letter:

<?= Str::ucfirst($page->category()) ?>

If you want to render all letters in uppercase:

<?= $page->category()->toUpper() ?>

If you want to output the text that is shown to the user rather than the value stored in the content file, you have different options, that are explained in our Cookbook recipe Fetching field options.