[SalesForce] email and landing Pages AMPScript

There are 2 ways that we use to pass user information to Landing Pages:

Option 1: QueryParameter

In Email:

%%[VAR @email,@name,@landingpage
Set @email = 'email@example.com' 
Set @name = 'Test' 
Set @landingpage = Concat('https://pub.exacttarget.com/landingpage?email=',@email,'&name=',@name)
]%% 
<a href = "%%=RedirectTo(@landingpage)=%%">Click Here</a>

On LandingPage:

<form>
  Name:<br>
  <input type="text" name="name" value="%%=v(QueryParameter('name'))=%%"><br>
  Email:<br>
  <input type="text" name="email" value="%%=v(QueryParameter('email'))=%%">
</form>

Option 2: LookupRows & DataView

In Email:

%%[VAR @subscriberkey,@landingpage
Set @subscriberkey= '123456789' 
Set @landingpage = Concat('https://pub.exacttarget.com/landingpage?key=',@subscriberkey)
]%% 
<a href = "%%=RedirectTo(@landingpage)=%%">Click Here</a>

On LandingPage:

%%[
var @key, @email, @name
set @key = QueryParameter("key")
set @email = FIELD(ROW(LookupRows("_Subscribers","SubscriberKey",@key),1), "EmailAddress")
set @name = FIELD(ROW(LookupRows("Example_Customer_Data_DE","SubscriberKey",@key),1), "Name")
]%%
<form>
  Name:<br>
  <input type="text" name="name" value="%%=v(@name)=%%"><br>
  Email:<br>
  <input type="text" name="email" value="%%=v(@email)=%%">
</form>

Note that both of these methods are taking values from AMPScript at the time of send, and appending them to the destination URL string. For this reason, you may need some security/hashing/encoding to prevent malicious attempts to access your customer data via the form.

I hope that helps.

I found the problem. It's in FormData that needs to be posted in a separate XMLHttpRequest send(). But it's not a way for this case as I need to post once to the same page making form's parameters available for AMPScript. I changed the js code so it stores the base64 string in a hidden field. Now the RequestParameter function works.