Docker remove confirm button

luasrc/view/tasks/docker.htm

@@ -18,6 +18,12 @@ if self.task_start_failed then
 
 <%+cbi/map%>
 
+<div id="customModal" class="alert-message warning" style="display:none;">
+    "This will permanently delete your installation, are you sure?"
+    <a href="javascript:void(0)" onclick="proceedRemoval()">Yes</a> /
+    <a href="javascript:void(0)" onclick="closeRemoveConfirmation()">No</a>
+</div>
+
 <div class="cbi-page-actions control-group">
 <%
     if not task_running then
@@ -41,7 +47,7 @@ if self.task_start_failed then
             else 
 %>
                 <input class="btn cbi-button cbi-button-apply" type="button" value="<%:Start%>" onclick="cbi_submit(this, 'cbi.apply', 'start')" />
-                <input class="btn cbi-button cbi-button-remove" type="button" value="<%:Remove%>" onclick="cbi_submit(this, 'cbi.apply', 'rm')" />
+                <input class="btn cbi-button cbi-button-remove" type="button" value="<%:Remove%>" onclick="showRemoveConfirmation()" />
 <%
             end 
         else 
@@ -57,6 +63,21 @@ if self.task_start_failed then
 %>
 </div>
 
+<script>
+    function showRemoveConfirmation() {
+        document.getElementById("customModal").style.display = "block";
+    }
+
+    function closeRemoveConfirmation() {
+        document.getElementById("customModal").style.display = "none";
+    }
+
+    function proceedRemoval() {
+        closeRemoveConfirmation();
+        cbi_submit(document.querySelector('.cbi-button-remove'), 'cbi.apply', 'rm');
+    }
+</script>
+
 <%+tasks/embed%>
 
 <%