Javascript Question

[Anonymous]

The Marketo Article here: https://community.marketo.com/MarketoArticle?id=kA050000000L3Zb provides sample Javascript that you can use on Landing Pages to take an Email token value from a parameter and populate a form field.

Only problem is, if the parameter value isn't present, the Javascript makes the form field default to show the words "undefined".

Is there a small tweak we can make to the JS in that artice, to have the form field prepopulate with no value if the parameter value is missing?

[Anonymous]

Hi Carrie,

You can try to add some conditional logic using the following examples:

if(typeof variable_here === 'undefined') {

   // your code here.

 };

or 

if(! variable_here) {

   // your code here.

};

If you can share your code here, I may be able to you a bit further.

Hope that helps.

[Anonymous]

Thanks for your response Reade, the code we're using is the same as that in the article:

<script language="Javascript" src="/js/public/jquery-latest.min.js" type="text/javascript"></script>
<script src="/js/public/jQueryString-2.0.2-Min.js" type="text/javascript" ></script>
<script>
  // to set cookies.  Uses noConflict just in case
  var $jQ = jQuery.noConflict();
  var pEmail = $jQ.getQueryString({ ID: "Email" });
document.getElementById("Email").setAttribute("value", pEmail);
</script>

[Anonymous]

Did you try the sample snippets and get it working? If not, can you also share the landing page you are using?

[Anonymous]

Hi Reade,

Thanks for providing those two suggestions, I tried both of these, however the "undefined" value was still appearing.

Having said that, I'm not particularly familiar with JS so I'm kind of shooting in the dark a little with where to insert it.

Any ideas?

Thanks,
Carrie
 

[Anonymous]

Hi Carrie,

Can you share the landing page you are using?

Reade

[Anonymous]

Hi Reade,

I can't share the actual page, however I've created a replica that functions the same in our own instance for you to take a look at here: http://insights.datarati.com.au/CarrieCommunityTest.html

If you're not cookied, you'll see the field prepopulates with "undefined" - we'd like it to be blank if the Email token isn't present in the URL parameter.

Thanks,
Carrie

[Anonymous · Accepted solution]

Hi Carrie,

Replace your landing page content block that contains the JavaScript code you added to prepopulate the email field on the landing page with the following code:

<script language="Javascript" src="/js/public/jquery-latest.min.js" type="text/javascript"></script>
<script src="/js/public/jQueryString-2.0.2-Min.js" type="text/javascript" ></script>
<script>
     // to set cookies.  Uses noConflict just in case
     var $jQ = jQuery.noConflict();
     var pEmail = $jQ.getQueryString({ ID: "Email" });
//--> I added this conditional statement <-- //
     if (! pEmail) {
         //alert('Email address is undefined!');
         document.getElementById("Email").setAttribute("value", '');
     };
</script>

Let me know how that goes!

Reade

[Anonymous]

Reade, you are a superstar!

This worked like a charm 🙂

Thank you!