FormBuilderMultiplier - repeatable Fieldgroups in FormBuilder forms

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I'm really in love with FormBuilder, but the one thing missing to match all my end users' expectations were repeatable field groups. Think repeaters, in ProcessWire terms. Our primary application of PW is our corporate intranet, so "lines" of fields are quite common in the forms I build. We have all kinds of request forms where the information for a varying number of colleagues needs to be entered (from meal order to flight booking request) and where it is simply impractical to send a form for each, and I don't want to clutter my forms with multiple instances of fields that may only get used ten percent of the time.

That's why I started to build FormBuilderMultiplier (link to GitHub).

What it does:

  • Adds an option to make a regular Fieldgroup repeatable
  • Lets you limit the number of instances of a Fieldgroup on the form
  • Adds an "Add row" button the form that adds another instance of the Fieldgroup's fields
  • Adds a counter suffix at the end of every affected field's label
  • Stores the entered values just like regular fields
  • Makes the entered values available in preview and email notifications
  • Supports most text based fields, textareas and selects (really, I haven't had enough time to test all the available choices yet)

What it doesn't do (yet):

  • Support saving to ProcessWire pages (i.e. real Repeaters)

I haven't tested all the validation stuff, Date/Time inputs etc. yet, but since I'm utterly swamped with other stuff at work, I didn't want to wait until I have it polished. Any feedback is welcome. There might also be some issues with different output frameworks that I haven't encountered yet. The forms I work with mostly use UIKit.


Still alpha, so test well before using it in the field.

Known issues:

When rows are added, the form's iframe needs to be resized, which isn't completely clean yet.

How it works:

The Fieldgroup settings are added through regular hooks, as is the logic that adds the necessary field copies for processing the form and displaying previews.

"Multiplied" field instances are suffixed with _NUM, where NUM is an incremental integer starting from 1. So if you have add two fields named "surname" and "givenname" to a fieldgroup and check the "multiply" checkbox, the form will initially have "surname_1" and "givenname_1" field (I'm still considering changing that to make the risk to shoot oneself into the foot by having a regular "surname_1" field somewhere else in the form less likely).

When a "row" is added, the first row is cloned through JS and the counter in the fields' IDs, names and "for" attributes as well as the counter in the label are incremented before appending the copies to the Fieldset container in the form.

To keep backend and frontend in sync, a hidden field named [name of the fieldset]__multiplier_rows is added to the form. Both the backend and the frontend script use this to store and retrieve the number of "rows".


  • Naturally, add the option to store the data in real repeaters when saving to pages.
  • Do a lot of testing (and likely fixing).
  • Make a few things (like the "Add row" button label etc.) configurable in field(set) context.
  • Add a smooth API to retrieve the multiplied values as WireArrays.

The mandatory moving screenshot:


  • Like 13

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Hey! Sounds great!
I was looking for something like this for a client migration to PW for a long time.

I will check it out.

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20 hours ago, Peter Knight said:

Are there plans to also allow multipliers on the front end?

Thanks. I'm not completely sure if I read your question right. The screencap above shows the front end form (it's just included in the backend interface on the preview tab, but it's the same as if you embed your form anywhere on the frontend).

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Hi @BitPoet,

I have tried your module and ran into a few error:

1. The "multiplied" rows are not getting the _NUM suffic for name and ID. Only on the label its adding #2

2. And Fatal error is thrown when checking the entries. This is within the ToPopulate function. If I Escape this row the error is gone. (I'm on the latest dev PW version)  

//$hid->label = _("Number of rows");

3. When I can view the data in entries -> the multiplier doestn have a value and the orginal has the filled in value of the original. Probably caused by 1. 

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1 hour ago, DL7 said:

I have tried your module and ran into a few error

Hi @DL7,

thanks for the feedback. I'll try to find the time tomorrow to give it a spin on the latest PW version so I can hopefully reproduce the behavior.

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Hi @BitPoet,

Thanks! Some additonal pointer: on an older version (3.0.36) I dont see this fatal error, but the increment still isnt working. 

The below mentioned isnt working for me either on this older version. See the form initially starts with their "normal" ID/Name as been set in the settings

On 11/12/2018 at 7:54 PM, BitPoet said:

the form will initially have "surname_1" and "givenname_1" field

This works only if I add 

if($child->name) $child->name .= "_1";

If I do this, then the increment is working perfectly. Problem I face then is that none of the entries fields are filled with values 🙂 I'm also looking into that. Fixed that by adding this same line to the populate hook:

if($child->name) $child->name .= "_1";


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@BitPoet One additional error I see: when using embed methode c, the JS is not triggered, this posting the form when clicking on add row. I'm checking it currently but havent found the problem yet. 

Added this the init

		$this->addHookAfter('Page::render', $this, 'addScripts');

This as a function

    public function addScripts($event) {
		$page = $event->object; 
		if($page->template == 'admin') return;
        $additionalHeadScripts = '<script type="text/javascript" src="'.wire('config')->urls->siteModules.'FormBuilderMultiplier/FormBuilderMultiplier.js"></script>';
		$event->return = str_replace("</head>", $additionalHeadScripts.'</head>', $event->return); 

And commented/removed the current JS append to get this fixed. 

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