Improve no email warning during registration

src/components/views/dialogs/RegistrationEmailPromptDialog.tsx

@@ -0,0 +1,96 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import * as React from "react";
+
+import { _t } from '../../../languageHandler';
+import { IDialogProps } from "./IDialogProps";
+import {useRef, useState} from "react";
+import Field from "../elements/Field";
+import CountlyAnalytics from "../../../CountlyAnalytics";
+import withValidation from "../elements/Validation";
+import * as Email from "../../../email";
+import BaseDialog from "./BaseDialog";
+import DialogButtons from "../elements/DialogButtons";
+
+interface IProps extends IDialogProps {
+    onFinished(continued: boolean, email?: string): void;
+}
+
+const validation = withValidation({
+    rules: [
+        {
+            key: "email",
+            test: ({ value }) => !value || Email.looksValid(value),
+            invalid: () => _t("Doesn't look like a valid email address"),
+        },
+    ],
+});
+
+const RegistrationEmailPromptDialog: React.FC<IProps> = ({onFinished}) => {
+    const [email, setEmail] = useState("");
+    const fieldRef = useRef<Field>();
+
+    const onSubmit = async () => {
+        if (email) {
+            const valid = await fieldRef.current.validate({ allowEmpty: false });
+
+            if (!valid) {
+                fieldRef.current.focus();
+                fieldRef.current.validate({ allowEmpty: false, focused: true });
+                return;
+            }
+        }
+
+        onFinished(true, email);
+    };
+
+    return <BaseDialog
+        title={_t("Continuing without email")}
+        className="mx_RegistrationEmailPromptDialog"
+        contentId="mx_RegistrationEmailPromptDialog"
+        onFinished={() => onFinished(false)}
+        fixedWidth={false}
+    >
+        <div className="mx_Dialog_content" id="mx_RegistrationEmailPromptDialog">
+            <p>{_t("Just a heads up, if you don't add an email and forget your password, you could " +
+                "<b>permanently lose access to your account.</b>", {}, {
+                b: sub => <b>{sub}</b>,
+            })}</p>
+            <form onSubmit={onSubmit}>
+                <Field
+                    ref={fieldRef}
+                    type="text"
+                    label={_t("Email (optional)")}
+                    value={email}
+                    onChange={ev => {
+                        setEmail(ev.target.value);
+                    }}
+                    onValidate={async fieldState => await validation(fieldState)}
+                    onFocus={() => CountlyAnalytics.instance.track("onboarding_registration_email2_focus")}
+                    onBlur={() => CountlyAnalytics.instance.track("onboarding_registration_email2_blur")}
+                />
+            </form>
+        </div>
+        <DialogButtons
+            primaryButton={_t("Continue")}
+            onPrimaryButtonClick={onSubmit}
+            hasCancel={false}
+        />
+    </BaseDialog>;
+};
+
+export default RegistrationEmailPromptDialog;