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Dependent Select with StimulusJS
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class CategoriesController < ApplicationController | |
def fields | |
render json: Field.where(category_id: params[:id]).order(:id) | |
end | |
end |
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import { Controller } from "stimulus" | |
export default class extends Controller { | |
static targets = [ "source", "target" ]; | |
handleSelectChange() { | |
this.populateSelect(this.sourceTarget.value); | |
} | |
populateSelect(sourceId, targetId = null) { | |
fetch(`/${this.data.get('sourceRoutePart')}/${sourceId}/${this.data.get('targetRoutePart')}`, { | |
credentials: 'same-origin' | |
}) | |
.then(response => response.json()) | |
.then(data => { | |
const selectBox = this.targetTarget; | |
selectBox.innerHTML = ''; | |
data.forEach(item => { | |
const opt = document.createElement('option'); | |
opt.value = item.id; | |
opt.innerHTML = item[this.data.get('displayAttribute')]; | |
opt.selected = parseInt(targetId) === item.id; | |
selectBox.appendChild(opt); | |
}); | |
}); | |
} | |
} |
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= simple_form_for @entry, wrapper: :horizontal_form do |f| | |
.row | |
.col-12.col-md-6 | |
#fields-wrapper[data-controller="dependent-select" data-dependent-select-display-attribute="title" data-dependent-select-source-route-part="categories" data-dependent-select-target-route-part="fields"] | |
.row.mb-3 | |
.col | |
= select_tag :category, options_from_collection_for_select(Project.order(:name), :id, :name), class: 'form-control', data: {target: 'dependent-select.source', action: 'dependent-select#handleSelectChange'}, prompt: 'Please select...' | |
.col | |
= f.input :field_id, as: :select, input_html: {data: {target: 'dependent-select.target'}}, label: false | |
= f.button :submit |
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Rails.application.routes.draw do | |
resources :categories do | |
member do | |
get :fields | |
end | |
end | |
end |
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