https://www.knightfrank.co.in/library/common/js/kf-ajax-forms-contactus.js?v=5

1function ajaxFormContactus(options) {
2	var _this = {};
3	_this.options = {};
4	_this.formId = "";
5	_this.$button = null;
6	_this.recaptcha = null;
7	_this.recaptchaWidgetId = null;
8	_this.resetRecaptcha = function () {
9		if (_this.recaptchaWidgetId != null) {
10			grecaptcha.reset(_this.recaptchaWidgetId);
11		}
12	};
13	_this.executeRecaptcha = function () {
14		if (_this.recaptchaWidgetId != null) {
15			_this.resetRecaptcha(); // Ensures Recaptcha has loaded properly
16			grecaptcha.execute(_this.recaptchaWidgetId);
17		}
18	};
19	_this.constructor = function (options) {
20		_this.formId = $(options.formSelector).data("form-id");
21		$(options.formSelector).on('keypress', function (e) {
22			if (e.which === 13 && !$(e.target).is("textarea")) {
23				_this.send();
24				return false;
25			}
26		});
27		_this.options = options;
28		if (!_this.options.url) {
29			_this.options.url = "/services/forms/ajaxforms.asmx/" + $(_this.options.formSelector).data("kf-ajax-form");
30		}
31		_this.renderRecapthca();
32		_this.$button = $(_this.options.formSelector).find(".contact-submit-contactus");
33
34		_this.$button.on('click', function (event) {
35			event.preventDefault();
36			_this.send();
37			return;
38		});
39	};
40	_this.renderRecapthca = function () {
41		if (window.grecaptcha && window.grecaptcha.render) {
42			_this.recaptcha = $(options.formSelector).find("[data-ajax-form-recaptcha]");
43			if (_this.recaptcha.length === 0) {
44				return;
45			}
46
47			_this.recaptchaWidgetId = grecaptcha.render(
48				_this.recaptcha[0],
49				{
50					'sitekey': _this.recaptcha.data("ajax-form-recaptcha"),
51					'callback': _this.send,
52					'size': 'invisible'
53				}
54			);
55			return;
56		}
57		setTimeout(_this.renderRecapthca, 500);
58	};
59	_this.sending = false;
60	_this.send = function (captchaToken) {
61		if (_this.sending && !captchaToken) {
62			return;
63		}
64		_this.sending = true;
65		var form = getForm(_this.options.formSelector);
66		var data = form.data;
67		data.formId = _this.formId;
68		data.captchaToken = captchaToken;
69		data.url = window.location.href;
70		if (_this.options.validation && !_this.options.validation(_this.options.formSelector, form)) {
71			_this.sending = false;
72			_this.resetRecaptcha();
73			return;
74		}
75		if (_this.recaptcha && (_this.recaptcha.length > 0 && !captchaToken)) {
76			_this.sending = false;
77			_this.executeRecaptcha();
78			return;
79		}
80		var dataToSend = {
81			formData: data
82		};
83
84		function handleSuccess(msg) {
85
86			if (window.tC) {
87				tC.event.cms_contact_form_submit(this, {
88					"form_name": "CMS Contact Form",
89					"form_status": "form.submit.success",
90					"lead_id": msg.d.EFormSubmissionId
91				});
92			}
93
94			if (_this.options.showOnSuccessSelector) {
95				$(options.formSelector).find(_this.options.showOnSuccessSelector).removeClass("d-none");
96			}
97			if (_this.options.hideOnSuccessSelector) {
98				$(options.formSelector).find(_this.options.hideOnSuccessSelector).addClass("d-none");
99			}
100			if (_this.options.onSuccess) {
101				_this.options.onSuccess(msg.d);
102			}
103			_this.response = msg.d;
104			_this.sending = false;
105		}
106
107		function handleError() {
108			$(options.formSelector).find(_this.options.showOnErrorSelector).removeClass("d-none");
109			$(options.formSelector).find(_this.options.hideOnSuccessSelector).addClass("d-none");
110		}
111
112		$.ajax({
113			type: "POST",
114			url: options.url,
115			data: JSON.stringify(dataToSend),
116			contentType: "application/json; charset=utf-8",
117			success: function (msg) {
118				if (msg.d.Errors.length > 0) {
119					handleError();
120				} else {
121					handleSuccess(msg);
122				}
123				_this.resetRecaptcha();
124			},
125			error: function () {
126				handleError();
127				_this.resetRecaptcha();
128			}
129		});
130	};
131
132	_this.constructor(options);
133	return _this;
134}
135
136var ajaxFormHelpers = new function () {
137	var _this = this;
138	_this._containsHtmlRegex = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
139	_this.containsHtml = function () {
140		return re.test(String(form.data.email).toLowerCase());
141	};
142	_this.isEmptyOrWhiteSpace = function (str) {
143		return !str || str.match(/^ *$/) !== null;
144	};
145	_this.setErrorState = function (field, showError) {
146		if (showError) {
147			$(field).addClass("invalid-input");
148			$(field).prev().addClass("invalid-label");
149			return;
150		}
151		$(field).removeClass("invalid-input");
152		$(field).prev().removeClass("invalid-label");
153	};
154};
155
156function getForm(formSelector) {
157	var form = {
158		data: {},
159		fields: {}
160	};
161
162	$(formSelector).find("input,textarea,select").each(function () {
163		var name = $(this).attr("name");
164		if (typeof name !== 'undefined') {
165			var value;
166			if ($(this).is(':checkbox')) {
167				value = $(this).is(':checked');
168			} else {
169				value = $(this).val();
170			}
171			form.data[name] = value;
172			form.fields[name] = this;
173		}
174	});
175	return form;
176};