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* Landing-page lead form — client-side behavior for standalone campaign
* pages (e.g. /get-matched).
*
* Validation contract (mirrors /api/landing-lead): name required, and at
* least one of phone/email must be valid; a filled-but-invalid contact is an
* error, never silently dropped.
*
* GA4/GTM engagement taxonomy (all pushed to dataLayer, all deduped
* client-side so GA sees first-occurrence signals, not keystroke noise):
* - lp_field_focus {field} — user clicked/tabbed into a field
* - lp_field_input {field} — user actually typed in a field
* - lp_cta_click — submit button pressed (fires even when
* validation then fails)
* - lp_form_error {fields} — client validation rejected the submit
* - lp_scroll_depth {percent} — 25/50/75/100, reading signal
* - lp_link_click {link} — footer/subtle links
* - generate_lead — canonical conversion event (lead_type:
* "landing") so the existing GA4 lead tag
* fires without GTM changes
* Every event carries page_path (canonical page dimension) + source.
*/
import { pushDataLayerEvent } from "../lib/gtm";
import {
validateCustomerName,
validateIndianPhoneNumber,
} from "../lib/validation";
const EMAIL_RE = /^[^@\s]+@[^@\s]+\.[^@\s]+$/;
function eventBase(source: string): Record<string, unknown> {
return { page_path: window.location.pathname, source };
}
function initLandingForm(root: HTMLElement): void {
const source = root.dataset.source ?? "landing";
const form = root.querySelector<HTMLFormElement>(".lf-form");
const successDiv = root.querySelector<HTMLElement>(".lf-success");
const successName = root.querySelector<HTMLElement>(".lf-success-name");
const errorBanner = root.querySelector<HTMLElement>(".lf-error");
const submitBtn = root.querySelector<HTMLButtonElement>(".lf-submit");
if (!form || !successDiv || !submitBtn) return;
const fields = ["name", "phone", "email", "locality", "notes"] as const;
const input = (name: string) =>
form.querySelector<HTMLInputElement | HTMLTextAreaElement>(
`[name="${name}"]`,
);
// ── Engagement: typing ────────────────────────────────────────────────
const focused = new Set<string>();
const typed = new Set<string>();
for (const name of fields) {
const el = input(name);
if (!el) continue;
el.addEventListener("focus", () => {
if (focused.has(name)) return;
focused.add(name);
pushDataLayerEvent("lp_field_focus", {
...eventBase(source),
field: name,
});
});
el.addEventListener("input", () => {
el.classList.remove("bad");
hideError();
if (typed.has(name)) return;
typed.add(name);
pushDataLayerEvent("lp_field_input", {
...eventBase(source),
field: name,
});
});
}
// ── Engagement: reading (scroll depth) ────────────────────────────────
const firedDepths = new Set<number>();
function onScroll(): void {
const doc = document.documentElement;
const scrollable = doc.scrollHeight - window.innerHeight;
const percent =
scrollable <= 0
? 100
: Math.round((window.scrollY / scrollable) * 100);
for (const threshold of [25, 50, 75, 100]) {
Eif (percent >= threshold && !firedDepths.has(threshold)) {
firedDepths.add(threshold);
pushDataLayerEvent("lp_scroll_depth", {
...eventBase(source),
percent: threshold,
});
}
}
Eif (firedDepths.size === 4) {
window.removeEventListener("scroll", onScroll);
}
}
window.addEventListener("scroll", onScroll, { passive: true });
// ── Engagement: clicking (subtle links) ───────────────────────────────
for (const link of root.querySelectorAll<HTMLAnchorElement>("a[href]")) {
link.addEventListener("click", () => {
pushDataLayerEvent("lp_link_click", {
...eventBase(source),
link: link.getAttribute("href") ?? "",
});
});
}
// ── Validation ────────────────────────────────────────────────────────
function showError(message: string): void {
if (!errorBanner) return;
errorBanner.textContent = message;
errorBanner.classList.remove("hidden");
}
function hideError(): void {
errorBanner?.classList.add("hidden");
}
function validate(): { errors: string[]; message: string } {
// Each failing field gets its own sentence so the banner never blames a
// field the user filled correctly (e.g. a bad phone must not read as
// "check your name").
const errors: string[] = [];
const problems: string[] = [];
const name = input("name")?.value.trim() ?? "";
if (!name || validateCustomerName(name)) {
errors.push("name");
problems.push("Please enter your name (at least 2 letters).");
}
const phone = input("phone")?.value.trim() ?? "";
const email = input("email")?.value.trim() ?? "";
if (phone !== "" && validateIndianPhoneNumber(phone)) {
errors.push("phone");
problems.push(
"That mobile number doesn't look right — Indian mobiles are 10 digits starting with 6, 7, 8 or 9.",
);
}
if (email !== "" && !EMAIL_RE.test(email)) {
errors.push("email");
problems.push("That email address doesn't look right.");
}
if (!phone && !email) {
errors.push("phone", "email");
problems.push(
"Please share at least one way to reach you — a 10-digit mobile number or an email address.",
);
}
return { errors, message: problems.join(" ") };
}
// ── Submit ────────────────────────────────────────────────────────────
submitBtn.addEventListener("click", () => {
pushDataLayerEvent("lp_cta_click", eventBase(source));
});
let submitting = false;
form.addEventListener("submit", async (e) => {
e.preventDefault();
Iif (submitting) return;
const { errors, message } = validate();
if (errors.length > 0) {
for (const name of fields) {
input(name)?.classList.toggle("bad", errors.includes(name));
}
showError(message);
pushDataLayerEvent("lp_form_error", {
...eventBase(source),
fields: errors.join(","),
});
return;
}
hideError();
submitting = true;
submitBtn.disabled = true;
const originalLabel = submitBtn.textContent;
submitBtn.textContent = "Sending…";
const payload: Record<string, string> = {
name: input("name")?.value.trim() ?? "",
source,
pagePath: window.location.pathname,
};
const phone = input("phone")?.value.trim();
const email = input("email")?.value.trim();
const locality = input("locality")?.value.trim();
const notes = input("notes")?.value.trim();
if (phone) payload.phone = phone;
if (email) payload.email = email;
if (locality) payload.locality = locality;
if (notes) payload.notes = notes;
try {
const response = await fetch("/api/landing-lead", {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify(payload),
});
const result = (await response.json()) as {
success?: boolean;
error?: string;
};
if (!response.ok || !result.success) {
showError(result.error ?? "Something went wrong. Please try again.");
return;
}
pushDataLayerEvent("generate_lead", {
...eventBase(source),
lead_type: "landing",
});
if (successName) {
successName.textContent = payload.name.split(/\s+/)[0] || "there";
}
form.classList.add("hidden");
successDiv.classList.remove("hidden");
} catch {
showError("Something went wrong. Please check your connection and try again.");
} finally {
submitting = false;
submitBtn.disabled = false;
submitBtn.textContent = originalLabel;
}
});
}
const rootEl = document.querySelector<HTMLElement>("[data-landing-form]");
Iif (rootEl) initLandingForm(rootEl);
export { initLandingForm };
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