Hello,
Thank you for reaching out to the API Support team here at Constant Contact.
There isn't a way to do this built-in to the embedded signup form code directly, however this may be possible by using javascript on your page. Consider something like this:
var i = document.location.href.lastIndexOf('?');
var types = document.location.href.substr(i+1).replace(/list=/g,'').split('&');
$('input[name="listId"]').prop('checked',function(){
return $.inArray(this.value,types) !== -1;
});
Consider the url is 'http://mysite.com/signup.html?list=1&list=2'
i is set to be the index of '?' in the url
.substr() removes all but 'list=1&list=2' from the url, giving us the string: "list=1&list=2"
.replace() removes the "list=" text from the string leaving us with: "1&2"
.split() splits that string into an array with the values: ["1","2"]
$.inArray() checks whether value of checkbox named "listID" is in the ["1","2"] array. If it is, then it checks the "listID" checkbox.
This would need customization to work with your form's fields and how your URL parameters are set up, but this should get you started in the right direction.
Please let me know if you have any other questions!
Sincerely,
David B.
API Support Specialist
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