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Last active December 8, 2022 11:37
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Gravity Forms - Checkbox Dynamic Population
// When true, the form will be saved to DB after dynamic population
define('EO_SAVE_FORM_ON_PRE_RENDER', true);
// Adds a filter to form id 7. Replace 26 with your actual form id
add_filter('gform_pre_render_7', 'eo_populate_checkbox');
add_filter('gform_admin_pre_render_7', 'eo_populate_checkbox');
function eo_populate_checkbox($form) {
if (EO_SAVE_FORM_ON_PRE_RENDER)
$the_form = RGFormsModel::get_form_meta($form['id']);
else
$the_form = &$form;
// Creating choices
$choices = array(
array('text' => 'Choice 1', 'value' => 'choice1'),
array('text' => 'Choice 2', 'value' => 'choice2'),
array('text' => 'Choice 3', 'value' => 'choice3'),
);
$inputs = array(
array('label' => 'Choice 1', 'id' => '2.1'), // replace 2 in 2.1 with your field id
array('label' => 'Choice 2', 'id' => '2.2'), // replace 2 in 2.2 with your field id
array('label' => 'Choice 3', 'id' => '2.3'), // replace 2 in 2.3 with your field id
);
// Adding items to field id 2. Replace 2 with your actual field id.
// You can get the field id by looking at the input name in the markup.
foreach ($the_form['fields'] as &$field) {
// replace 2 with your checkbox field id
if ($field['id'] == 2) {
$field['choices'] = $choices;
$field['inputs'] = $inputs;
}
}
// Save form to database, if constant is set to true
if (EO_SAVE_FORM_ON_PRE_RENDER)
RGFormsModel::update_form_meta($form['id'], $the_form);
return $the_form;
}
@mathiasmaul
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Thank you, this was very useful. :)

@lkraav
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lkraav commented Dec 30, 2015

If the form is AJAX, I think the custom additions are lost in case of validation errors. That's what we're seeing. Experiences? Perhaps this needs to be done at JS level instead https://www.gravityhelp.com/forums/topic/dynamically-populating-checkboxes

EDIT yes you need 4 filters, see https://www.gravityhelp.com/documentation/article/gform_pre_render/#example-2

@emilie-nagahama
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Hi! Thanks for posting this - it's the perfect guide to help me figure out a gravity forms problem! If you have the time I have a question. How would you pre-select a checkbox based on the page the form is on? This is the last piece of my GF puzzle -- if you have any ideas around this I would be grateful for your help.

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