如何在 Stimulus JS 控制器中声明 const 字符串？

Question

我想为我的控制器的 CSS 选择器设置一个 const 变量，而不是在整个控制器中对其进行硬编码。我已将声明放入控制器的initialize() 中，但收到错误消息，表明该变量未声明。这样做的正确方法是什么？

目前的尝试

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)
    // ...
  }

}

错误： ReferenceError：seasonInputSelector 未定义

Answer 1

const在模块的根范围中使用变量：

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 );
    // ...
  }

}

Answer 2

另一种方法是将其范围限制在类中

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 );
    // ...
  }
}