HTMLformAMPscriptPicklistCheckboxes.html

%%[
set @subscriberKey = AttributeValue(_subscriberKey)
set @subscriberRows = RetrieveSalesforceObjects(
   "Contact",
   "FirstName,LastName,Email,Preferences__c",
   "Id", "=", @subscriberKey )

if RowCount(@subscriberRows) == 1 then /* there should only be one row */
  var @subscriberRow, @firstName, @lastName, @email
  set @subscriberRow = Row(@subscriberRows, 1)
  set @firstName = Field(@subscriberRow, "FirstName")
  set @lastName = Field(@subscriberRow, "LastName")
  set @email = Field(@subscriberRow, "Email")
  set @Preferences__c = Field(@subscriberRow, "Preferences__c")
  
IF NOT EMPTY(@Preferences__c) THEN
    SET @rs = BuildRowsetFromString(@Preferences__c,';')
    
    IF rowcount(@rs) > 0 THEN
    
     FOR @i=1 TO rowcount(@rs) DO
      SET @val = Field(Row(@rs,@i),1)
      IF @val == "Surveys" THEN
      SET @Surveys = "checked"
      ELSEIF @val == "Events" THEN
      SET @Events = "checked"
      ELSEIF @val == "Newsletters" THEN
      SET @Newsletters = "checked"
      ELSEIF @val == "Promotions" THEN
      SET @Promotions = "checked"
      ELSEIF @val == "Special Offers" THEN       
      SET @Offers = "checked"
      ENDIF
     NEXT @i
   
    ELSE
    
    SET @Newsletters = ""
    SET @Events = ""
    SET @Offers = ""
    SET @Survays = ""
    SET @Promotions = ""
    
    ENDIF
ENDIF

endif

]%%

      <h2>Please fill in the form:</h2>
      <form action="%%=RequestParameter('PAGEURL')=%%" method="post">
         <label>First name: </label><input type="text" name="firstname" required="" value="%%=v(@firstName)=%%"><br>
         <label>Last name: </label><input type="text" name="lastname" required="" value="%%=v(@lastName)=%%"><br>
         <label>Email: </label><input type="text" name="email" required="" value="%%=v(@email)=%%"><br><br>
        <h2>Update your subscriptions:</h2>
      <input name="newsletters" type="checkbox" %%=v(@Newsletters)=%%><label>Newsletters</label><br>
      <input name="events" type="checkbox" %%=v(@Events)=%%><label>Events</label><br>
      <input name="offers" type="checkbox" %%=v(@Offers)=%%><label>Special Offers</label><br>
      <input name="surveys" type="checkbox" %%=v(@Surveys)=%%><label>Surveys</label><br>
      <input name="promotions" type="checkbox" %%=v(@Promotions)=%%><label>Promotions</label><br>
         <input name="submitted" type="hidden" value="true"><br>
         <input type="submit" value="Submit">
      </form>