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@spivurno spivurno/gist:4005684 forked from spivurno/gist:3708752
Last active Oct 12, 2015

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Gravity Wiz // Limit How Many Checkboxes Can Be Checked (and How Many MUST Be Checked)
<?php
/**
* Limit How Many Checkboxes Can Be Checked
* http://gravitywiz.com/2012/06/11/limiting-how-many-checkboxes-can-be-checked/
*/
class GFLimitCheckboxes {
private $form_id;
private $field_limits;
private $output_script;
function __construct($form_id, $field_limits) {
$this->form_id = $form_id;
$this->field_limits = $this->set_field_limits($field_limits);
add_filter("gform_pre_render_$form_id", array(&$this, 'pre_render'));
add_filter("gform_validation_$form_id", array(&$this, 'validate'));
}
function pre_render($form) {
$script = '';
$output_script = false;
foreach($form['fields'] as $field) {
$field_id = $field['id'];
$field_limits = $this->get_field_limits($field['id']);
if( !$field_limits // if field limits not provided for this field
|| RGFormsModel::get_input_type($field) != 'checkbox' // or if this field is not a checkbox
|| !isset($field_limits['max']) // or if 'max' is not set for this field
)
continue;
$output_script = true;
$max = $field_limits['max'];
$selectors = array();
foreach($field_limits['field'] as $checkbox_field) {
$selectors[] = "#field_{$form['id']}_{$checkbox_field} .gfield_checkbox input:checkbox";
}
$script .= "jQuery(\"" . implode(', ', $selectors) . "\").checkboxLimit({$max});";
}
GFFormDisplay::add_init_script($form['id'], 'limit_checkboxes', GFFormDisplay::ON_PAGE_RENDER, $script);
if($output_script):
?>
<script type="text/javascript">
jQuery(document).ready(function($) {
$.fn.checkboxLimit = function(n) {
var checkboxes = this;
this.toggleDisable = function() {
// if we have reached or exceeded the limit, disable all other checkboxes
if(this.filter(':checked').length >= n) {
var unchecked = this.not(':checked');
unchecked.prop('disabled', true);
}
// if we are below the limit, make sure all checkboxes are available
else {
this.prop('disabled', false);
}
}
// when form is rendered, toggle disable
checkboxes.bind('gform_post_render', checkboxes.toggleDisable());
// when checkbox is clicked, toggle disable
checkboxes.click(function(event) {
checkboxes.toggleDisable();
// if we are equal to or below the limit, the field should be checked
return checkboxes.filter(':checked').length <= n;
});
}
});
</script>
<?php
endif;
return $form;
}
function validate($validation_result) {
$form = $validation_result['form'];
$checkbox_counts = array();
// loop through and get counts on all checkbox fields (just to keep things simple)
foreach($form['fields'] as $field) {
if( RGFormsModel::get_input_type($field) != 'checkbox' )
continue;
$field_id = $field['id'];
$count = 0;
foreach($_POST as $key => $value) {
if(strpos($key, "input_{$field['id']}_") !== false)
$count++;
}
$checkbox_counts[$field_id] = $count;
}
// loop through again and actually validate
foreach($form['fields'] as &$field) {
if(!$this->should_field_be_validated($form, $field))
continue;
$field_id = $field['id'];
$field_limits = $this->get_field_limits($field_id);
$min = isset($field_limits['min']) ? $field_limits['min'] : false;
$max = isset($field_limits['max']) ? $field_limits['max'] : false;
$count = 0;
foreach($field_limits['field'] as $checkbox_field) {
$count += rgar($checkbox_counts, $checkbox_field);
}
if($count < $min) {
$field['failed_validation'] = true;
$field['validation_message'] = sprintf( _n('You must select at least %s item.', 'You must select at least %s items.', $min), $min );
$validation_result['is_valid'] = false;
}
else if($count > $max) {
$field['failed_validation'] = true;
$field['validation_message'] = sprintf( _n('You may only select %s item.', 'You may only select %s items.', $max), $max );
$validation_result['is_valid'] = false;
}
}
$validation_result['form'] = $form;
return $validation_result;
}
function should_field_be_validated($form, $field) {
if( $field['pageNumber'] != GFFormDisplay::get_source_page( $form['id'] ) )
return false;
// if no limits provided for this field
if( !$this->get_field_limits($field['id']) )
return false;
// or if this field is not a checkbox
if( RGFormsModel::get_input_type($field) != 'checkbox' )
return false;
// or if this field is hidden
if( RGFormsModel::is_field_hidden($form, $field, array()) )
return false;
return true;
}
function get_field_limits($field_id) {
foreach($this->field_limits as $key => $options) {
if(in_array($field_id, $options['field']))
return $options;
}
return false;
}
function set_field_limits($field_limits) {
foreach($field_limits as $key => &$options) {
if(isset($options['field'])) {
$ids = is_array($options['field']) ? $options['field'] : array($options['field']);
} else {
$ids = array($key);
}
$options['field'] = $ids;
}
return $field_limits;
}
}
new GFLimitCheckboxes(115, array(
5 => array(
'min' => 2,
'max' => 3
),
13 => array(
'max' => 3
)
));
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