Rewrite AddInstanceDialog

Object oriented it is

static/add_an_instance.mts

@@ -1,5 +1,6 @@
 // This file handles the "Add an instance" dialog
 
+import { FormDialog, ONCE } from "./dialog.mjs";
 import { findButtonOrFail, findFormOrFail, findInputOrFail } from "./dom.mjs";
 
 export function parseHost(host: string): { host: string, secure: boolean } | null {
@@ -13,43 +14,66 @@ export function parseHost(host: string): { host: string, secure: boolean } | nul
     };
 }
 
-export function initializeAddInstanceDialog(
-    dialog: HTMLDialogElement,
-    callback: (
-        host: string,
-        secure: boolean,
-        autoQueryMetadata: boolean,
-    ) => void
-): {
-    showAddInstanceDialog: () => void,
-    hideAddInstanceDialog: () => void,
-} {
-    const showAddInstanceDialog = () => dialog.showModal();
-    const hideAddInstanceDialog = () => dialog.close();
+type AddInstanceDialogData = {
+    host: string,
+    secure: boolean,
+    autoQueryMetadata: boolean,
+};
 
-    const form = findFormOrFail(dialog, ".addInstanceForm");
-    const instanceHost = findInputOrFail(form, "#instanceHost");
-    const autoQueryMetadata = findInputOrFail(form, "#autoQueryMetadata");
-    const closeButton = findButtonOrFail(form, ".close");
+export class AddInstanceDialog extends FormDialog {
+    protected instanceHost: HTMLInputElement;
+    protected autoQueryMetadata: HTMLInputElement;
+    protected closeButton: HTMLButtonElement;
 
-    instanceHost.addEventListener("input", e => {
-        if (parseHost(instanceHost.value) === null)
-            instanceHost.setCustomValidity("Invalid instance hostname or URL");
-        else
-            instanceHost.setCustomValidity("");
-    });
+    constructor(dialog: HTMLDialogElement, initializeDOM: boolean = true) {
+        super(dialog, findFormOrFail(dialog, ".addInstanceForm"));
+        this.instanceHost = findInputOrFail(this.form, "#instanceHost");
+        this.autoQueryMetadata = findInputOrFail(this.form, "#autoQueryMetadata");
+        this.closeButton = findButtonOrFail(this.form, ".close");
 
-    form.addEventListener("submit", e => {
-        // A sane browser doesn't allow for submitting the form if the above validation fails
-        const { host, secure } = parseHost(instanceHost.value)!;
-        callback(host, secure, autoQueryMetadata.checked);
-        form.reset();
-    });
+        if (initializeDOM) this.initializeDOM();
+    }
 
-    closeButton.addEventListener("click", e => hideAddInstanceDialog());
+    #getDataIfValid(): AddInstanceDialogData | null {
+        const parsedHost = parseHost(this.instanceHost.value);
+        if (parsedHost === null) {
+            this.instanceHost.setCustomValidity("Invalid instance hostname or URL");
+            return null;
+        }
+        this.instanceHost.setCustomValidity("");
+        return {
+            host: parsedHost.host,
+            secure: parsedHost.secure,
+            autoQueryMetadata: this.autoQueryMetadata.checked
+        };
+    }
 
-    return {
-        showAddInstanceDialog,
-        hideAddInstanceDialog
-    };
+    #handleSubmit(resolve: (data: AddInstanceDialogData) => void) {
+        this.form.addEventListener("submit", e => {
+            const data = this.#getDataIfValid();
+            if (data === null) {
+                // Prevent the user from submitting the form if it's invalid and let them try again
+                e.preventDefault();
+                this.#handleSubmit(resolve);
+                return;
+            }
+            resolve(data);
+            this.close();
+        }, ONCE);
+    }
+
+    protected override initializeDOM() {
+        super.initializeDOM();
+
+        this.instanceHost.addEventListener("input", e => this.#getDataIfValid());
+        this.closeButton.addEventListener("click", e => this.close());
+    }
+
+    async prompt(): Promise<AddInstanceDialogData> {
+        return new Promise((resolve, reject) => {
+            this.dialog.addEventListener("close", e => reject(), ONCE);
+            this.#handleSubmit(resolve);
+            this.open();
+        });
+    }
 }

static/add_instance_flow.mts

@@ -1,4 +1,4 @@
-import { initializeAddInstanceDialog } from "./add_an_instance.mjs";
+import { AddInstanceDialog } from "./add_an_instance.mjs";
 import { initializeInstanceDetailsDialog } from "./confirm_instance_details.mjs";
 import storageManager, { Instance } from "./storage_manager.mjs";
 

static/dialog.mts

@@ -0,0 +1,41 @@
+export const ONCE = { once: true };
+
+export class Dialog {
+    protected dialog: HTMLDialogElement;
+
+    constructor(dialog: HTMLDialogElement) {
+        this.dialog = dialog;
+    }
+
+    /**
+     * A function that should only be called once that has permanent effects on the DOM
+     */
+    protected initializeDOM() { }
+
+    protected open() {
+        this.dialog.showModal();
+    }
+
+    close() {
+        this.dialog.close();
+    }
+};
+
+export class FormDialog extends Dialog {
+    protected form: HTMLFormElement;
+
+    constructor(dialog: HTMLDialogElement, form: HTMLFormElement) {
+        super(dialog);
+        this.form = form;
+    }
+
+    protected override initializeDOM() {
+        super.initializeDOM();
+
+        this.dialog.addEventListener("close", e => this.reset());
+    }
+
+    reset() {
+        this.form.reset();
+    }
+}

tsconfig.json

@@ -4,6 +4,7 @@
         "allowJs": true,
         "checkJs": true,
         "strictNullChecks": true,
+        "noImplicitOverride": true,
     },
     "include": [
         "static/**.mts",