Display Alert Box in Customer Portal

Content

Hi,

We have a requirement to display alert box("Please fill date") whenever the user selects country (menu type custom field)  as India and clicks on submit with out filling the date field. For this initially, I wrote java script code to check for empty date value in the page . Please find the code snippet:-

Please let me know if I have to change/modify/add any part of the code. 

 

Thanks & Regards,

Bindu

Code Snippet

<form id="rn_QuestionSubmit" method="post" action="/ci/ajaxRequest/sendForm" onsubmit = "return checkforblank()">

function checkforblank() {
  if(document.getElementById('invoicedateid').value == null) {
    alert('please enter invoice date');
return false;
  }
<rn:widget path="input/FormSubmit" label_button=Submit" onclick="javascript: return checkforblank()" on_success_url="/app/ask_confirm" error_location="rn_ErrorLocation"/>