Looping through the post array with ampscript

Question

I am using ampscript in Cloud Pages. I am creating a form that will have a different number of options based on DE data. I need to change DE data based on the information that comes out of the form. I intend to put the data into the post array, but I don't know how to pull it out. I know how to put information into the post array with CloudPagesURL(), and I can get information out of the post array when I know what to ask for with requestparameter().

Is there a way to find the length of the array, or find the keys in the array?

Answer 1

The values of the various form elements' name attributes will be available to RequestParameter() after form submission.

For example, if your form looks like this...

<form method="POST" action="https://my-other-landing-page">
  <input type="text" name="firstName">
  <input type="text" name="lastName">

  <select name="state">
    <option value="ca">California</option>
    <option value="ny">New York</option>
  </select>

  <input type="radio" name="optin" value="yes"> Yes
  <input type="radio" name="optin" value="no" checked> No

  <button>Submit</button>
</form>

The AMPscript on "my-other-landing-page" would look something like this...

%%[
var @firstName,
    @lastName,
    @state,
    @optin

set @firstName = RequestParameter('firstName')
set @lastName = RequestParameter('lastName')
set @state = RequestParameter('state')
set @optin = RequestParameter('optin')

/* the rest of your logic... */
]%%

Answer 2

A bit late, but this works

<script runat="server">
Platform.Load("Core","1.1.1");
try{
  var jsonpost = Platform.Request.GetPostData();
  Write(decodeURI(jsonpost));
  var arr = jsonpost.split("&");
  var fieldArr = [];
  Write('<br>');
  
          for(i=0;i<arr.length;i++){
            var field = arr[i].split("=");
            var value = field[1];
            Write(field[0]);
            Write(value);
            Write('<br>');
            if(field[0] == 'Email' || field[0] == 'EmailAddress'){
              value = value.replace(/%40/g, '@');
            }

            if(value != ''){
              fieldArr.push(field[0]);
              fieldArr.push(value);
            }

          }
  Write(Stringify(fieldArr));
  
  

</script>


<script runat="server">
}catch(e){
 Write(Stringify(e));
}
</script>