Prefilling different data types during member signup

Hi Support,

We’re using webflow with memberstack and running into some trouble pre-filling multi-option select inputs and file upload inputs.

I have tried the following steps:

  • set ms-update="profile"on the form
  • set ms-data=<datafield> on the select/input element
  • tried setting ms-field=<datafield> on the select/input element

As soon as I set the ms-data=<datafield> on either the select or file input element, I immediately see this stack trace:

memberstack.js?webflow:1 Uncaught DOMException: Failed to set the 'value' property on 'HTMLInputElement': This input element accepts a filename, which may only be programmatically set to the empty string.
at Array.forEach (<anonymous>)
at Array.forEach (<anonymous>)
at W (
at HTMLDocument.<anonymous> (

The select behavior:

  • initial form submission files the values correctly into memberstack if only one option is selected.
  • If two or more options are selected, memberstack is only capturing the first value
  • I haven’t been able to pre-fill the select either as a multi-option or single-option using ms-data

The file upload behavior:

  • The initial form submission simply adds a windows default subpath to the filename i.e. file-input-field = C:\fakepath\Credit Report_Full.pdf
  • The form does not pre-fill using ms-datawith the above stack trace

Trying to figure out whether I’m doing this wrong / missing steps / or whether either or both of these are unsupported.



Running into similar issues as you with returning the state on a radio button

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Hey Cody, are you still having an issue with this?

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Hey Duncan! Sorry for the late reply been afk lately, I will re try it and get back to you!

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