diff --git a/app/controllers/customers_controller.rb b/app/controllers/customers_controller.rb
index c2d9731..fe602db 100644
--- a/app/controllers/customers_controller.rb
+++ b/app/controllers/customers_controller.rb
@@ -188,6 +188,21 @@ class CustomersController < ApplicationController
     end
   end
 
+  def add_apointment
+    estimate = params[:estimate_id]
+    invoice = params[:invoice_id] 
+    output = ""
+    logger.debug "Calling :add_apointment hook"
+          results = Redmine::Hook.call_hook :add_apointment, { customer: customer }
+          unless results.nil?
+            results.each do |r|
+              output.concat "%0A" if output.length > 0
+              output.concat r unless r.nil?
+            end
+          end
+    redirect_to "https://calendar.google.com/calendar/render?action=TEMPLATE&text=#{@customer.name}+-&details=#{ link_to t(:customer_details), "https://#{Setting.host_name}#{customer_path @customer.id}"}%0A#{@customer.primary_phone}%0A#{output}&dates=#{Time.now.strftime("%Y%m%d")}T090000/#{Time.now.strftime("%Y%m%d")}T170000", target: :_blank
+  end
+
   private
 
   # redmine permission - add customers
diff --git a/app/views/customers/_actions.html.erb b/app/views/customers/_actions.html.erb
index ab1bf78..c06aef9 100644
--- a/app/views/customers/_actions.html.erb
+++ b/app/views/customers/_actions.html.erb
@@ -1,5 +1,6 @@
-<%= link_to t(:label_appointment), "https://calendar.google.com/calendar/render?action=TEMPLATE&text=#{@customer.name}+-&details=#{ link_to t(:customer_details), "https://#{Setting.host_name}#{customer_path @customer.id}"}%0A#{@customer.primary_phone}&dates=#{Time.now.strftime("%Y%m%d")}T090000/#{Time.now.strftime("%Y%m%d")}T170000", target: :_blank %>
+<%= link_to t(:label_appointment), "https://calendar.google.com/calendar/render?action=TEMPLATE&text=#{@customer.name}+-&details=#{ link_to t(:customer_details), "https://#{Setting.host_name}#{customer_path @customer.id}"}%0A#{@customer.primary_phone}&dates=#{Time.now.strftime("%Y%m%d")}T090000/#{Time.now.strftime("%Y%m%d")}T170000", target: :_blank, id: :appointment_link %>
 
+<button onclick="updateLink()">Change Link</button>
 <br/>
 <br/>
 
diff --git a/assets/javascripts/application.js b/assets/javascripts/application.js
index f240bcc..809c0dd 100644
--- a/assets/javascripts/application.js
+++ b/assets/javascripts/application.js
@@ -1,11 +1,30 @@
-$(function() {
-  $("input#issue_customer_id").on("change", function() {
-    
-    $.ajax({
-      url: "/filter_estimates_by_customer",
-      type: "GET",
-      data: { selected_customer: $("input#issue_customer_id").val() }
-    });
-  });
-    
-});
+function updateLink() {
+
+  const selectedIds = getSelectedInvoiceIds();
+ 
+
+  const extra = `%0A${selectedIds}`; 
+
+  const linkElement = document.getElementById("appointment_link");
+  const absoluteUrl = linkElement.href;
+  let result = absoluteUrl.replace(/&dates/g, `${extra}&dates`);
+
+  linkElement.href = result;
+  linkElement.textContent = "New Appointment Link";
+}
+
+function getSelectedInvoiceIds() {
+  // Select all checkboxes with the class 'invoice-checkbox'
+  const checkboxes = document.querySelectorAll('.invoice-checkbox');
+  
+  // Use Array.from to convert NodeList to an array and then filter and map
+  const selectedIds = Array.from(checkboxes)
+      .filter(checkbox => checkbox.checked) // Keep only checked checkboxes
+      .map(checkbox => checkbox.value);     // Extract the value (invoice ID)
+
+  // Display the result (for demonstration)
+  console.log(JSON.stringify(selectedIds));
+  
+  // You can return the array or use it as needed
+  return selectedIds;
+}