I have found that if the user submits the form and there is an issue with a doubled username, then they will be redirected back to the registration form, but the loose the URL parameters:
../index.php/sign-up
How can I adjust the registration form such that it retains these parameters?
You can't, the plans pages just render the CB registration form inside of it, but it doesn't add any parameters like that to the form POST URL as CBSubs has no handling of registration save process.
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If you're going to redirect permanently why not display the plan on registration so you don't have to mess with redirecting or anything of the sort. A redirect also would not pass along the POST data so the form would be emptied everytime there was a registration validation error like that.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
Read FAQ thoroughly
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Read our Documentation
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Search the forums CB links:
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Localization
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CB Quickstart
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CB Paid Subscriptions
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-- If you are a Professional, Developer, or CB Paid Subscriptions subscriber and have a support issue please always post in your respective support forums for best results!
-- If I've missed your support post with a delay of 3 days or greater and are a Professional, Developer, or CBSubs subscriber please
send me a private message
with your thread and will reply when possible!
-- Please note I am available Monday - Friday from 8:00 AM CST to 4:00 PM CST. I am away on weekends (Saturday and Sunday) and if I've missed your post on or before a weekend after business hours please wait for the next following business day (Monday) and will get to your issue as soon as possible, thank you.
-- My role here is to provide guidance and assistance. I cannot provide custom code for each custom requirement. Please do not inquire me about custom development.