javascript - How can I declare a const string in my Stimulus JS controller? - Stack Overflow

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I'm wanting to set a const variable for a CSS selector for my controller, instead of having it hard coded throughout my controller. I had put the declaration in the initialize() of my controller, but I'm getting an error that the variable wasn't declared. What's the correct way of doing this?

Current Attempt

import { Controller } from "stimulus"

export default class extends Controller {
  static targets = ["form"]

  initialize() {
    const seasonInputSelector = "input[id$='_season']"
  }

  change(event) {
    // ...
    var yearNodes = this.formTarget.querySelectorAll(seasonInputSelector)
    // ...
  }

}

Error: ReferenceError: seasonInputSelector is not defined

I'm wanting to set a const variable for a CSS selector for my controller, instead of having it hard coded throughout my controller. I had put the declaration in the initialize() of my controller, but I'm getting an error that the variable wasn't declared. What's the correct way of doing this?

Current Attempt

import { Controller } from "stimulus"

export default class extends Controller {
  static targets = ["form"]

  initialize() {
    const seasonInputSelector = "input[id$='_season']"
  }

  change(event) {
    // ...
    var yearNodes = this.formTarget.querySelectorAll(seasonInputSelector)
    // ...
  }

}

Error: ReferenceError: seasonInputSelector is not defined

• javascript
• stimulusjs

Share Improve this question Follow asked Jun 27, 2020 at 19:34 daveomcddaveomcd 6,5551616 gold badges8686 silver badges142142 bronze badges 1

• 1 You're declaring seasonInputSelector as a local inside the initialize method. It doesn't exist outside of initialize. You need to move it to be a static class-level field (as your class is anonymous you can't do this) or a const in the module's scope. – Dai Commented Jun 27, 2020 at 19:36

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2 Answers 2

Sorted by: Reset to default 15

Use a const variable in the module's root scope:

import { Controller } from "stimulus"

const seasonInputSelector = "input[id$='_season']";

export default class extends Controller {
  static targets = ["form"]

  initialize() {
  }

  change(event) {
    // ...
    var yearNodes = this.formTarget.querySelectorAll( seasonInputSelector );
    // ...
  }

}

An alternative is to scope it inside your class

import { Controller } from "stimulus"

export default class extends Controller {
  static targets = ["form"]
  seasonInputSelector = "input[id$='_season']";

  change(event) {
    // ...
    var yearNodes = this.formTarget.querySelectorAll( this.seasonInputSelector );
    // ...
  }
}

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