Migrate Link Dialog from CoffeeScript to Javascript

Migrate the Link Dialog from CoffeeScript to Javascript. This will also trim the internal class structure a bit to be better readable.

app/assets/javascripts/alchemy/admin.js

@@ -9,5 +9,4 @@
 //= require alchemy/alchemy.elements_window
 //= require alchemy/alchemy.fixed_elements
 //= require alchemy/alchemy.image_overlay
-//= require alchemy/alchemy.link_dialog
 //= require alchemy/alchemy.preview_window

app/javascript/alchemy_admin.js

@@ -11,6 +11,7 @@ import IngredientAnchorLink from "alchemy_admin/ingredient_anchor_link"
 import ImageLoader from "alchemy_admin/image_loader"
 import ImageCropper from "alchemy_admin/image_cropper"
 import Initializer from "alchemy_admin/initializer"
+import { LinkDialog } from "alchemy_admin/link_dialog"
 import ListFilter from "alchemy_admin/list_filter"
 import pictureSelector from "alchemy_admin/picture_selector"
 import pleaseWaitOverlay from "alchemy_admin/please_wait_overlay"
@@ -79,6 +80,7 @@ Object.assign(Alchemy, {
   ImageCropper,
   Initializer,
   IngredientAnchorLink,
+  LinkDialog,
   ListFilter,
   pictureSelector,
   pleaseWaitOverlay,

app/javascript/alchemy_admin/link_dialog.js

@@ -0,0 +1,118 @@
+// Represents the link Dialog that appears, if a user clicks the link buttons
+// in TinyMCE or on an Ingredient that has links enabled (e.g. Picture)
+//
+export class LinkDialog extends Alchemy.Dialog {
+  constructor(link) {
+    const url = new URL(Alchemy.routes.link_admin_pages_path, window.location)
+    const parameterMapping = {
+      url: link.url,
+      selected_tab: link.type,
+      link_title: link.title,
+      link_target: link.target
+    }
+
+    // searchParams.set would also add undefined values
+    Object.keys(parameterMapping).forEach((key) => {
+      if (parameterMapping[key]) {
+        url.searchParams.set(key, parameterMapping[key])
+      }
+    })
+
+    super(url.href, {
+      size: "600x320",
+      title: "Link"
+    })
+  }
+
+  /**
+   *  Called from Dialog class after the url was loaded
+   */
+  replace(data) {
+    // let Dialog class handle the content replacement
+    super.replace(data)
+    // Store some jQuery objects for further reference
+    this.$internal_link = $("#internal_link", this.dialog_body)
+    this.$element_anchor = $("#element_anchor", this.dialog_body)
+    this.linkForm = document.querySelector('[data-link-form-type="internal"]')
+
+    // attach events we handle
+    this.attachEvents()
+  }
+
+  /**
+   * make the open method a promise
+   * maybe in a future version the whole Dialog will respond with a promise result if the dialog is closing
+   * @returns {Promise<unknown>}
+   */
+  open() {
+    super.open(...arguments)
+    return new Promise((resolve) => (this.resolve = resolve))
+  }
+
+  updatePage(page) {
+    this.$internal_link.val(page != null ? page.url_path : undefined)(
+      (this.linkForm.querySelector("alchemy-anchor-select").page =
+        page != null ? page.id : undefined)
+    )
+  }
+
+  // Attaches click events to forms in the link dialog.
+  attachEvents() {
+    // enable the dom selection in internal link tab
+    this.linkForm.addEventListener("Alchemy.PageSelect.ItemRemoved", (e) =>
+      this.updatePage()
+    )
+    this.linkForm.addEventListener("Alchemy.PageSelect.ItemAdded", (e) =>
+      this.updatePage(e.detail)
+    )
+
+    $("[data-link-form-type]", this.dialog_body).on("submit", (e) => {
+      e.preventDefault()
+      this.link_type = e.target.dataset.linkFormType
+      // get url and remove a possible hash fragment
+      let url = $(`#${this.link_type}_link`).val().replace(/#\w+$/, "")
+      if (this.link_type === "internal" && this.$element_anchor.val() !== "") {
+        url += "#" + this.$element_anchor.val()
+      }
+
+      // Create the link
+      this.createLink({
+        url,
+        title: $(`#${this.link_type}_link_title`).val(),
+        target: $(`#${this.link_type}_link_target`).val()
+      })
+    })
+  }
+
+  // Creates a link if no validation errors are present.
+  // Otherwise shows an error notice.
+  createLink(options) {
+    if (
+      this.link_type === "external" &&
+      !options.url.match(Alchemy.link_url_regexp)
+    ) {
+      this.showValidationError()
+    } else {
+      this.setLink(options)
+      this.close()
+    }
+  }
+
+  // Sets the link either in TinyMCE or on an Ingredient.
+  setLink(options) {
+    this.resolve({
+      url: options.url.trim(),
+      title: options.title,
+      target: options.target,
+      type: this.link_type
+    })
+  }
+
+  // Shows validation errors
+  showValidationError() {
+    $("#errors ul", this.dialog_body).html(
+      `<li>${Alchemy.t("url_validation_failed")}</li>`
+    )
+    return $("#errors", this.dialog_body).show()
+  }
+}