app/webpacker/controllers/variant_controller.js
import { Controller } from "stimulus";
import OptionValueNamer from "js/services/option_value_namer";
// Dynamically update related variant fields
//
export default class VariantController extends Controller {
connect() {
// Assuming these will be available on the variant soon, just a quick hack to find the product fields:
const product = this.element.closest("[data-record-id]");
this.variantUnit = product.querySelector('[name$="[variant_unit]"]');
this.variantUnitScale = product.querySelector('[name$="[variant_unit_scale]"]');
this.variantUnitName = product.querySelector('[name$="[variant_unit_name]"]');
this.unitValue = this.element.querySelector('[name$="[unit_value]"]');
this.unitDescription = this.element.querySelector('[name$="[unit_description]"]');
this.unitValueWithDescription = this.element.querySelector(
'[name$="[unit_value_with_description]"]',
);
this.displayAs = this.element.querySelector('[name$="[display_as]"]');
this.unitToDisplay = this.element.querySelector('[name$="[unit_to_display]"]');
// on unit changed; update display_as:placeholder and unit_to_display
[this.variantUnit, this.variantUnitScale, this.variantUnitName].forEach((element) => {
element.addEventListener("change", this.#unitChanged.bind(this), { passive: true });
});
this.variantUnitName.addEventListener("input", this.#unitChanged.bind(this), { passive: true });
// on unit_value_with_description changed; update unit_value and unit_description
// on unit_value and/or unit_description changed; update display_as:placeholder and unit_to_display
this.unitValueWithDescription.addEventListener("input", this.#unitChanged.bind(this), {
passive: true,
});
// on display_as changed; update unit_to_display
// TODO: optimise to avoid unnecessary OptionValueNamer calc
this.displayAs.addEventListener("input", this.#updateUnitDisplay.bind(this), { passive: true });
}
disconnect() {
// Make sure to clean up anything that happened outside
}
// private
// Extract variant_unit and variant_unit_scale from dropdown variant_unit_with_scale,
// and update hidden product fields
#unitChanged(event) {
//Hmm in hindsight the logic in product_controller should be inn this controller already. then we can do everything in one event, and store the generated name in an instance variable.
this.#extractUnitValues();
this.#updateUnitDisplay();
}
// Extract unit_value and unit_description
#extractUnitValues() {
// Extract a number (optional) and text value, separated by a space.
const match = this.unitValueWithDescription.value.match(/^([\d\.\,]+(?= |$)|)( |)(.*)$/);
if (match) {
let unit_value = parseFloat(match[1].replace(",", "."));
unit_value = isNaN(unit_value) ? null : unit_value;
unit_value *= this.variantUnitScale.value ? this.variantUnitScale.value : 1; // Normalise to default scale
this.unitValue.value = unit_value;
this.unitDescription.value = match[3];
}
}
// Update display_as placeholder and unit_to_display
#updateUnitDisplay() {
const unitDisplay = new OptionValueNamer(this.#variant()).name();
this.displayAs.placeholder = unitDisplay;
this.unitToDisplay.textContent = this.displayAs.value || unitDisplay;
}
// A representation of the variant model to satisfy OptionValueNamer.
#variant() {
return {
unit_value: parseFloat(this.unitValue.value),
unit_description: this.unitDescription.value,
product: {
variant_unit: this.variantUnit.value,
variant_unit_scale: parseFloat(this.variantUnitScale.value),
variant_unit_name: this.variantUnitName.value,
},
};
}
}