LJ Dynamic Fields

Populate Craft fields with dynamic data using the power of Twig.

Requirements

Craft 3 and Craft 4 are supported.

Installation

You can install the plugin via the Craft Plugin Store.

LJ Dynamic Fields Overview

This plugin adds the following fieldtypes:

• Checkboxes (dynamic)
• Dropdown (dynamic)
• Multi-select (dynamic)
• Radio Buttons (dynamic)

Simple example

You can populate the options for each fieldtye as a JSON array, like this :

{ "value":"jim", "label":"Jim Beam" },
{ "value":"jack", "label":"Jack Daniels", "default":true },
{ "value":"mark", "label":"Maker's Mark" },
{ "value":"rebel", "label":"Rebel Yell", "default":true }

This is a simple example of a checkboxes field with two of the four options selected by default.

No big deal, right? But the real power of this plugin is the ability to dynamically populate your fields using Twig logic.

All entries, ordered by title

{% for entry in craft.entries.orderBy('title').all() %}
    {{ loop.index > 1 ? ',' }} {    
        "value":"{{ entry.id }}",
        "label":"{{ entry|e }}",
        "default":{{ entry.slug == 'home' ? 'true' : 'false' }}
    }
{% endfor %}

Here is a radiobuttons field containing all current entries, ordered by title, with the homepage selected by default.

Because you're able to use Twig to create field options, you can do all kinds of crazy things.

Every first Saturday of the month

{% for i in 1..6 %}
    {% set eventDate = now|date_modify('first saturday of +' ~ i ~ ' month') %}
    {{ loop.index > 1 ? ',' }} {
        "value":"{{ eventDate|date('Y-m-d') }}",
        "label":"{{ eventDate|date("l, jS F Y") }}"
    }
{% endfor %}

This is a dynamic dropdown field with options for every first Saturday for the next six months.

All sections

{% for section in craft.app.sections.allSections %}
    {{ loop.index > 1 ? ',' }} {    
        "value":"{{ section.id }}",
        "label":"{{ section|e }}"
    }
{% endfor %}

Here is a multi-select field containing all sections.

Template example

You can even configure your field options in a separate template file.

{% include '_dynamicfields/usStates.json' ignore missing %}

# templates/_dynamicfields/usStates.json

{ "label":"Alabama", "value":"AL" }, { "label":"Alaska", "value":"AK" }, { "label":"American Samoa", "value":"AS" }, { "label":"Arizona", "value":"AZ" }, { "label":"Arkansas", "value":"AR" }, { "label":"California", "value":"CA" }, { "label":"Colorado", "value":"CO" }, { "label":"Connecticut", "value":"CT" }, { "label":"Delaware", "value":"DE" }, { "label":"District Of Columbia", "value":"DC" }, { "label":"Federated States Of Micronesia", "value":"FM" }, { "label":"Florida", "value":"FL" }, { "label":"Georgia", "value":"GA" }, { "label":"Guam", "value":"GU" }, { "label":"Hawaii", "value":"HI" }, { "label":"Idaho", "value":"ID" }, { "label":"Illinois", "value":"IL" }, { "label":"Indiana", "value":"IN" }, { "label":"Iowa", "value":"IA" }, { "label":"Kansas", "value":"KS" }, { "label":"Kentucky", "value":"KY" }, { "label":"Louisiana", "value":"LA" }, { "label":"Maine", "value":"ME" }, { "label":"Marshall Islands", "value":"MH" }, { "label":"Maryland", "value":"MD" }, { "label":"Massachusetts", "value":"MA" }, { "label":"Michigan", "value":"MI" }, { "label":"Minnesota", "value":"MN" }, { "label":"Mississippi", "value":"MS" }, { "label":"Missouri", "value":"MO" }, { "label":"Montana", "value":"MT" }, { "label":"Nebraska", "value":"NE" }, { "label":"Nevada", "value":"NV" }, { "label":"New Hampshire", "value":"NH" }, { "label":"New Jersey", "value":"NJ" }, { "label":"New Mexico", "value":"NM" }, { "label":"New York", "value":"NY" }, { "label":"North Carolina", "value":"NC" }, { "label":"North Dakota", "value":"ND" }, { "label":"Northern Mariana Islands", "value":"MP" }, { "label":"Ohio", "value":"OH" }, { "label":"Oklahoma", "value":"OK" }, { "label":"Oregon", "value":"OR" }, { "label":"Palau", "value":"PW" }, { "label":"Pennsylvania", "value":"PA" }, { "label":"Puerto Rico", "value":"PR" }, { "label":"Rhode Island", "value":"RI" }, { "label":"South Carolina", "value":"SC" }, { "label":"South Dakota", "value":"SD" }, { "label":"Tennessee", "value":"TN" }, { "label":"Texas", "value":"TX" }, { "label":"Utah", "value":"UT" }, { "label":"Vermont", "value":"VT" }, { "label":"Virgin Islands", "value":"VI" }, { "label":"Virginia", "value":"VA" }, { "label":"Washington", "value":"WA" }, { "label":"West Virginia", "value":"WV" }, { "label":"Wisconsin", "value":"WI" }, { "label":"Wyoming", "value":"WY" }

More useful examples

Time range picker

{% set startTime = '09:00' %}
{% set endTime = '17:00' %}
{% set defaultTime = '13:00' %}
{% set increments = 15 %}
{% for time in range(
	startTime|date('U'),
	endTime|date('U'),
	increments * 60
	) %}
    {{ loop.index > 1 ? ',' }} {    
        "value":"{{ time|date('H:i') }}",
        "label":"{{ time|date('H:i') }}",
        "default":{{ time|date('H:i') == defaultTime ? 'true' : 'false' }}
    }
{% endfor %}

Date range picker

{% set startDate = '2018-05-18' %}
{% for i in 0..14 %}
    {% set date = startDate|date_modify('+' ~ i ~ ' day') %}
    {{ loop.index > 1 ? ',' }} {
        "value":"{{ date|date('Y-m-d') }}",
        "label":"{{ date|date("l, jS F Y") }}"
    }
{% endfor %}

UK Counties

{ "value":"Aberdeenshire", "label":"Aberdeenshire" }, { "value":"Angus", "label":"Angus" }, { "value":"Antrim", "label":"Antrim" }, { "value":"Argyll", "label":"Argyll" }, { "value":"Armagh", "label":"Armagh" }, { "value":"Ayrshire", "label":"Ayrshire" }, { "value":"Banffshire", "label":"Banffshire" }, { "value":"Bedfordshire", "label":"Bedfordshire" }, { "value":"Bedfordshire", "label":"Berkshire" }, { "value":"Berwickshire", "label":"Berwickshire" }, { "value":"Bristol", "label":"Bristol" }, { "value":"Buckinghamshire", "label":"Buckinghamshire" }, { "value":"Bute", "label":"Bute" }, { "value":"Caithness", "label":"Caithness" }, { "value":"Cambridgeshire", "label":"Cambridgeshire" }, { "value":"Cheshire", "label":"Cheshire" }, { "value":"City of London", "label":"City of London" }, { "value":"Clackmannanshire", "label":"Clackmannanshire" }, { "value":"Clwyd", "label":"Clwyd" }, { "value":"Cornwall", "label":"Cornwall" }, { "value":"Cumbria", "label":"Cumbria" }, { "value":"Derbyshire", "label":"Derbyshire" }, { "value":"Devon", "label":"Devon" }, { "value":"Dorset", "label":"Dorset" }, { "value":"Down", "label":"Down" }, { "value":"Dumfriesshire", "label":"Dumfriesshire" }, { "value":"Dunbartonshire", "label":"Dunbartonshire" }, { "value":"Durham", "label":"Durham" }, { "value":"Dyfed", "label":"Dyfed" }, { "value":"East Lothian", "label":"East Lothian" }, { "value":"East Riding of Yorkshire", "label":"East Riding of Yorkshire" }, { "value":"East Sussex", "label":"East Sussex" }, { "value":"Essex", "label":"Essex" }, { "value":"Fermanagh", "label":"Fermanagh" }, { "value":"Fife", "label":"Fife" }, { "value":"Gloucestershire", "label":"Gloucestershire" }, { "value":"Greater London", "label":"Greater London" }, { "value":"Greater Manchester", "label":"Greater Manchester" }, { "value":"Gwent", "label":"Gwent" }, { "value":"Gwynedd", "label":"Gwynedd" }, { "value":"Hampshire", "label":"Hampshire" }, { "value":"Herefordshire", "label":"Herefordshire" }, { "value":"Hertfordshire", "label":"Hertfordshire" }, { "value":"Inverness-shire", "label":"Inverness-shire" }, { "value":"Isle of Wight", "label":"Isle of Wight" }, { "value":"Kent", "label":"Kent" }, { "value":"Kincardineshire", "label":"Kincardineshire" }, { "value":"Kinross-shire", "label":"Kinross-shire" }, { "value":"Kirkcudbrightshire", "label":"Kirkcudbrightshire" }, { "value":"Lanarkshire", "label":"Lanarkshire" }, { "value":"Lancashire", "label":"Lancashire" }, { "value":"Leicestershire", "label":"Leicestershire" }, { "value":"Lincolnshire", "label":"Lincolnshire" }, { "value":"Londonderry", "label":"Londonderry" }, { "value":"Merseyside", "label":"Merseyside" }, { "value":"Mid Glamorgan", "label":"Mid Glamorgan" }, { "value":"Midlothian", "label":"Midlothian" }, { "value":"Moray", "label":"Moray" }, { "value":"Nairnshire", "label":"Nairnshire" }, { "value":"Norfolk", "label":"Norfolk" }, { "value":"North Yorkshire", "label":"North Yorkshire" }, { "value":"Northamptonshire", "label":"Northamptonshire" }, { "value":"Northumberland", "label":"Northumberland" }, { "value":"Nottinghamshire", "label":"Nottinghamshire" }, { "value":"Orkney", "label":"Orkney" }, { "value":"Oxfordshire", "label":"Oxfordshire" }, { "value":"Peeblesshire", "label":"Peeblesshire" }, { "value":"Perthshire", "label":"Perthshire" }, { "value":"Powys", "label":"Powys" }, { "value":"Renfrewshire", "label":"Renfrewshire" }, { "value":"Ross and Cromarty", "label":"Ross and Cromarty" }, { "value":"Roxburghshire", "label":"Roxburghshire" }, { "value":"Rutland", "label":"Rutland" }, { "value":"Selkirkshire", "label":"Selkirkshire" }, { "value":"Shetland", "label":"Shetland" }, { "value":"Shropshire", "label":"Shropshire" }, { "value":"Somerset", "label":"Somerset" }, { "value":"South Glamorgan", "label":"South Glamorgan" }, { "value":"South Yorkshire", "label":"South Yorkshire" }, { "value":"Staffordshire", "label":"Staffordshire" }, { "value":"Stirlingshire", "label":"Stirlingshire" }, { "value":"Suffolk", "label":"Suffolk" }, { "value":"Surrey", "label":"Surrey" }, { "value":"Sutherland", "label":"Sutherland" }, { "value":"Tyne and Wear", "label":"Tyne and Wear" }, { "value":"Tyrone", "label":"Tyrone" }, { "value":"Warwickshire", "label":"Warwickshire" }, { "value":"West Glamorgan", "label":"West Glamorgan" }, { "value":"West Lothian", "label":"West Lothian" }, { "value":"West Midlands", "label":"West Midlands" }, { "value":"West Sussex", "label":"West Sussex" }, { "value":"West Yorkshire", "label":"West Yorkshire" }, { "value":"Wigtownshire", "label":"Wigtownshire" }, { "value":"Wiltshire", "label":"Wiltshire" }, { "value":"Worcestershire", "label":"Worcestershire" }

Templating

Dropdown and Radio Button fields return a single value.

{{ entry.myDropdownField }}
// Prints something like: jack

Checkboxes and Multi-select fields can have multiple values so these are returned as a JSON-encoded string.

{{ entry.myCheckboxesField }}
// Prints something like: ["jack","rebel"]

You can loop through these values using the json_decode filter.

{% for value in entry.myCheckboxesField|json_decode %}
    {{ value }}
{% endfor %}

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Brought to you by Lewis Jenkins