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Change a Form's Follow Up Page Dynamically

Document created by 08b21bd4b65c4441fd72920f489da6afa097beae on Dec 11, 2014Last modified by 9588451ecc601f1a2620c0a3338f73ddec06dbf4 on Jan 20, 2015
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Say you have a landing page with a form. You can dynamically change the form's follow up page based on values in the form by following these instructions.


Note: Please ensure that you have access to an experienced JavaScript developer.

Marketo Technical Support is not set up to assist with troubleshooting JavaScript.


On a Marketo landing page, the follow up page is stored in two form fields -- returnURL and retURL.  You can change them with jQuery by adding a custom HTML block in to your landing page:

<script src="/js/public/jquery-latest.min.js" type="text/javascript"></script>
<script type="text/javascript">
    // set no conflict mode for jquery
  var $jQ = jQuery.noConflict();


    // set the new follow up page

To change this based on a value submitted in a form, you need to find the id of the field to read from.  You can find that ID by previewing the web page, viewing the source code for the page, then finding the label for the form field in the HTML.  In this example, it's TimeToPurchase:

<label>Time To Purchase:</label><span class='mktInput'><input class='mktFormText mktFormString' name="TimeToPurchase" id="TimeToPurchase" type='text' value="" maxlength='255' tabIndex='1' />

Next, use a jQuery hook to change returnURL and retURL when the form is submitted.  We'll also use jQuery to read the form field values.

Drag in a Custom HTML block onto your page, then paste in the following Javascript.  You must change the following for it to work correctly:

  • TimeToPurchase: to the ID of the field you're reading from (leave in the #)
  • URL: all the URL assignments to the locations where you want the user to go

If you need to check for additional values, add extra "case...break;" statements to the switch.

<script type="text/javascript" src="/js/public/jquery-latest.min.js"></script>
<script type="text/javascript" language="Javascript">


var $jQ = jQuery.noConflict();


function changeFollowupURL(){


     // first, set the default follow up page
  var URL = '';


     // override the default based on form values
     // Replace this with your own rules for setting the new URL
  switch ($jQ("#TimeToPurchase").attr("value")) {
    case "6 months":
      URL = '';
    case "1 year":
      URL = '';


    // set the new follow up page


  return true;

// catch when a form is submitted, change the followup URL
function formSubmit(elt) {
  return Mkto.formSubmit(elt);



The Javascript needed to read the value from the form field may be different depending on the type of the input (text box, select box, check box, etc.).  See the jQuery selectors documentation for other methods of getting those values, and Setting or Getting a Form Field Value via Javascript on a Landing Page for more on how to get the IDs of the fields.



      • Erin Van Leer

        Thanks for this, it's really helpful! In my case, the follow-up type is "Landing Page" and is set at the landing page level. I'd like to just append a utm to the end of the resolved follow-up url. Is there a dynamic value I can use with this script to do that? e.g.


            case "6 months":

              URL = 'dynamicvalue?param=value';