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Better Inventory with Gravity Forms

Gravity Forms does not support the concept of inventory out of the box. This snippet provides an easy method for setting up simple, one-off inventory limits on a per field basis.

Last updated | Written by 493 Comments

  • October 18, 2019: Fixed issue where field groups were not correctly limited on submission.

  • October 10, 2019: Fixed issue where Calculated Product fields were still added to order summary after their inventory was exhausted.

  • March 19, 2019: Fixed issue where remaining shortcode did not always target correct instance of Better Inventory.

  • November 17, 2018: Added support for fetching prepopulated values when limiting by field group.

  • April 26, 2018: Updated snippet for Gravity Forms 2.3; snippet now requires 2.3.

  • May 31, 2017: Updated "remaining" shortcode to correctly limit by field groups and approved payments flag.

  • January 27, 2017: Fixed bug with approved_payments_only parameter where entries with no payment were counting towards all inventory limits.

  • January 21, 2017: Added support for automatically limiting GP Limit Date-enabled Date fields and paired with an inventory input (via field_group parameter) so that days with exhausted inventory or not available.

  • January 17, 2017: Updated "remaining" shortcode to dynamically retrieve the limit for the specified form and field.

  • March 23, 2016: Added support for specifying "stock_qty" parameter as a function. Allows for dynamically setting the stock_qty during runtime.

  • March 15, 2016: Updated paid status to "Paid" from "Approved" to work with GF Payment Add-on framework.

  • October 5, 2014: Added support for "remaining" action on [gravityforms] shortcode.

  • October 1, 2014: Added support for "sum" action on [gravityforms] shortcode.

  • November 11, 2012: Fixed issue where database prefix was not applied via $wpdb->prefix.

Show All Updates

Let’s dive into the code first.

Show CodeDownload Code
<?php
/**
* Gravity Wiz // Gravity Forms // Better Inventory with Gravity Forms
*
* Implements the concept of "inventory" with Gravity Forms by allowing the specification of a limit determined by the
* sum of a specific field, typically a quantity field.
*
* @version 2.20
* @author David Smith <david@gravitywiz.com>
* @license GPL-2.0+
* @link http://gravitywiz.com/better-inventory-with-gravity-forms/
*/
class GW_Inventory {
public $_args;
public function __construct( $args ) {
$this->_args = $this->parse_args( $args );
add_action( 'init', array( $this, 'init' ) );
}
public function init() {
// make sure we're running the required minimum version of Gravity Forms
if( ! property_exists( 'GFCommon', 'version' ) || ! version_compare( GFCommon::$version, '1.8', '>=' ) ) {
return;
}
add_filter( "gform_pre_render_{$this->_args['form_id']}", array( $this, 'limit_by_field_values' ) );
add_filter( "gform_validation_{$this->_args['form_id']}", array( $this, 'limit_by_field_values_validation' ) );
// check 'field_group' for date fields; if found, limit based on exhausted inventory days.
if( ! empty( $this->_args['field_group'] ) ) {
add_filter( "gpld_limit_dates_options_{$this->_args['form_id']}", array( $this, 'limit_date_fields' ), 10, 2 );
}
// add 'sum' action for [gravityforms] shortcode
add_filter( 'gform_shortcode_sum', array( $this, 'shortcode_sum' ), 10, 2 );
add_filter( 'gform_shortcode_remaining', array( $this, 'shortcode_remaining' ), 10, 2 );
add_action( 'gwinv_before_get_sum', array( $this, 'before_get_sum' ) );
add_action( 'gwinv_after_get_sum', array( $this, 'after_get_sum' ) );
add_filter( 'gform_product_info', array( $this, 'handle_calculated_product_fields' ), 10, 3 );
if( $this->_args['enable_notifications'] ) {
$this->enable_notifications();
}
}
public function parse_args( $args ) {
$args = wp_parse_args( $args, array(
'form_id' => false,
'field_id' => false,
'input_id' => false,
'stock_qty' => false,
'out_of_stock_message' => __( 'Sorry, this item is out of stock.' ),
'not_enough_stock_message' => __( 'You ordered %1$s of this item but there are only %2$s of this item left.' ),
'approved_payments_only' => false,
'hide_form' => false,
'enable_notifications' => false,
'field_group' => array()
) );
/**
* @var $stock_qty
* @var $field_group
*/
extract( $args );
if( ! $stock_qty && isset( $limit ) ) {
$args['stock_qty'] = $limit;
unset( $args['limit'] );
}
if( isset( $limit_message ) ) {
$args['out_of_stock_message'] = $limit_message;
unset( $args['limit_message'] );
}
if( isset( $validation_message ) ) {
$args['not_enough_stock_message'] = $validation_message;
unset( $args['validation_message'] );
}
if( ! $args['input_id'] ) {
$args['input_id'] = $args['field_id'];
unset( $args['field_id'] );
}
if( $field_group && ! is_array( $field_group ) ) {
$args['field_group'] = array( $field_group );
}
return $args;
}
public function enable_notifications() {
if( ! class_exists( 'GW_Notification_Event' ) ) {
_doing_it_wrong( 'GW_Inventory::$enable_notifications', __( 'Inventory notifications require the \'GW_Notification_Event\' class.' ), '1.0' );
} else {
$event_slug = "gwinv_out_of_stock_{$this->_args['input_id']}";
$event_name = GFForms::get_page() == 'notification_edit' ? $this->get_notification_event_name() : __( 'Event name is only populated on Notification Edit view; saves a DB call to get the form on every ' );
$this->_notification_event = new GW_Notification_Event( array(
'form_id' => $this->_args['form_id'],
'event_name' => $event_name,
'event_slug' => $event_slug,
'trigger' => array( $this, 'notification_event_listener' )
) );
}
}
public function limit_by_field_values( $form ) {
if( $this->is_in_stock() ) {
return $form;
}
if( $this->_args['hide_form'] ) {
add_filter( "gform_get_form_filter_{$form['id']}", array( $this, 'get_out_of_stock_message' ) );
} else if( empty( $this->_args['field_group'] ) ) {
add_filter( 'gform_field_input', array( $this, 'hide_field' ), 10, 2 );
}
return $form;
}
public function limit_by_field_values_validation( $validation_result ) {
$input_id = $this->_args['input_id'];
$limit = $this->get_stock_quantity();
$validation_message = $this->_args['not_enough_stock_message'];
$form = $validation_result['form'];
$exceeded_limit = false;
foreach( $form['fields'] as &$field ) {
if( $field['id'] != intval( $input_id ) ) {
continue;
}
$requested_qty = rgpost( 'input_' . str_replace( '.', '_', $input_id ) );
$field_sum = $this->get_sum();
if( rgblank( $requested_qty ) || $field_sum + $requested_qty <= $limit ) {
continue;
}
$exceeded_limit = true;
$stock_left = $limit - $field_sum >= 0 ? $limit - $field_sum : 0;
$field['failed_validation'] = true;
$field['validation_message'] = sprintf( $validation_message, $requested_qty, $stock_left );
}
if( $exceeded_limit && ! empty( $this->_args['field_group'] ) ) {
foreach( $form['fields'] as &$field ) {
if( in_array( $field->id, $this->_args['field_group'] ) ) {
$field['failed_validation'] = true;
$field['validation_message'] = sprintf( $validation_message, $requested_qty, $stock_left );
}
}
}
$validation_result['form'] = $form;
$validation_result['is_valid'] = ! $validation_result['is_valid'] ? false : ! $exceeded_limit;
return $validation_result;
}
public function limit_by_field_group( $query, $form_id, $input_id ) {
global $wpdb;
if( $input_id != $this->_args['input_id'] ) {
return $query;
}
$form = GFAPI::get_form( $form_id );
$join = $where = array();
foreach( $this->_args['field_group'] as $index => $field_id ) {
$field = GFFormsModel::get_field( $form, $field_id );
$alias = sprintf( 'fgld%d', $index + 1 );
// Fetch entry from submission if available. Otherwise, get default/dynpop value.
if( rgpost( 'gform_submit' ) == $form_id ) {
$value = $field->get_value_save_entry( GFFormsModel::get_field_value( $field ), $form, null, null, null );
} else {
$value = $field->get_value_default_if_empty( GFFormsModel::get_parameter_value( $field->inputName, array(), $field ) );
}
$join[] = "\nINNER JOIN {$wpdb->prefix}gf_entry_meta {$alias} ON em.entry_id = {$alias}.entry_id";
$where[] = $wpdb->prepare( "CAST( {$alias}.meta_key as unsigned ) = %d AND {$alias}.meta_value = %s ", $field_id, $value );
}
$query['join'] .= implode( "\n", $join );
$query['where'] .= sprintf( "\n AND %s", implode( "\nAND ", $where ) );
return $query;
}
public function limit_date_fields( $options, $form ) {
global $wpdb;
foreach( $form['fields'] as $field ) {
if( ! in_array( $field->id, $this->_args['field_group'] ) || $field->get_input_type() != 'date' || $field->dateType != 'datepicker' ) {
continue;
}
$query = self::get_sum_query( $field->formId, $this->_args['input_id'] );
if( $this->_args['approved_payments_only'] ) {
$query = $this->limit_by_approved_payments_only( $query );
}
if( ! empty( $this->_args['field_group'] ) ) {
// add our Date field to the front of the array so we can reliably target it when replacing the queries below
array_unshift( $this->_args['field_group'], $field->id );
$this->_args['field_group'] = array_unique( $this->_args['field_group'] );
$query = $this->limit_by_field_group( $query, $field->formId, $this->_args['input_id'] );
}
$regex = sprintf( '/(CAST\( fgld1.meta_key as unsigned \) = %d) AND fgld1.meta_value = \'(?:[\w\d]*)\'/', $field->id );
preg_match( $regex , $query['where'], $match );
if( ! empty( $match ) ) {
list( $search, $replace ) = $match;
$query['where'] = str_replace( $search, $replace, $query['where'] );
}
$query['select'] = 'SELECT sum( em.meta_value ) as total, fgld1.meta_value as date';
$query['group_by'] = 'GROUP BY date';
$query['having'] = sprintf( 'HAVING total >= %d', $this->get_stock_quantity() );
$sql = implode( "\n", $query );
$results = $wpdb->get_results( $sql );
foreach( $results as $result ) {
$options[ $field->id ]['exceptionsMode'] = 'disable';
if ( ! is_array( $options[ $field->id ]['exceptions'] ) ) {
$options[ $field->id ]['exceptions'] = array();
}
$options[ $field->id ]['exceptions'][] = date( 'm/d/Y', strtotime( $result->date ) );
}
}
return $options;
}
public function get_stock_quantity() {
$stock = $this->_args['stock_qty'];
if( is_callable( $stock ) ) {
$stock = call_user_func( $stock );
}
return $stock;
}
public function is_in_stock() {
$count = $this->get_sum();//self::get_field_values_sum( $this->_args['form_id'], $this->_args['input_id'] );
return $count < $this->get_stock_quantity();
}
public function hide_field( $field_content, $field ) {
if( $field['id'] == intval( $this->_args['input_id'] ) ) {
$quantity_input = '';
// GF will default to a quantity of 1 if it can't find the input for a Quantity field.
if ( $field->type === 'quantity' ) {
$quantity_input = sprintf( '<input type="hidden" name="input_%d_%d" value="0" />', $field->formId, $field->id );
}
return sprintf( '<div class="ginput_container">%s%s</div>', $this->_args['out_of_stock_message'], $quantity_input );
}
return $field_content;
}
public function notification_event_listener() {
// really is no better hook to use to send custom notifications just yet
add_filter( "gform_confirmation_{$this->_args['form_id']}", array( $this, 'send_out_of_stock_notifications' ), 10, 3 );
}
public function send_out_of_stock_notifications( $return, $form, $entry ) {
// if product is still in stock or the entry is spam, don't sent notification
if( $this->is_in_stock() || $entry['status'] == 'spam' )
return $return;
// if product is out of stock and no qty of the product is in current order, assume that out of stock notifications have already been sent
$requested_qty = intval( rgar( $entry, (string) $this->_args['input_id'] ) );
if( $requested_qty <= 0 )
return $return;
$this->_notification_event->send_notifications( $this->_notification_event->get_event_slug(), $form, $entry );
return $return;
}
public function get_notification_event_name() {
$form = GFAPI::get_form( $this->_args['form_id'] );
$field = GFFormsModel::get_field( $form, $this->_args['input_id'] );
$event_name = sprintf( __( '%s: Out of Stock' ), GFCommon::get_label( $field ) );
return $event_name;
}
public function shortcode_sum( $output, $atts ) {
$atts = shortcode_atts( array(
'id' => false,
'input_id' => false
), $atts );
/**
* @var $id
* @var $input_id
*/
extract( $atts ); // gives us $id, $input_id
return intval( self::get_field_values_sum( $id, $input_id ) );
}
public function shortcode_remaining( $output, $atts ) {
/**
* @var $id
* @var $input_id
* @var $limit
*/
$atts = shortcode_atts( array(
'id' => false,
'input_id' => false,
'limit' => false,
), $atts );
extract( $atts ); // gives us $id, $input_id
if( $input_id == $this->_args['input_id'] && $id == $this->_args['form_id'] ) {
$limit = $limit ? $limit : $this->get_stock_quantity();
$remaining = $limit - intval( $this->get_sum() );
$output = max( 0, $remaining );
}
return $output;
}
public function get_sum() {
if( $this->_args['approved_payments_only'] ) {
add_filter( 'gwinv_query', array( $this, 'limit_by_approved_payments_only' ) );
}
if( ! empty( $this->_args['field_group'] ) ) {
add_filter( 'gwinv_query', array( $this, 'limit_by_field_group' ), 10, 3 );
}
$sum = self::get_field_values_sum( $this->_args['form_id'], $this->_args['input_id'] );
remove_filter( 'gwinv_query', array( $this, 'limit_by_approved_payments_only' ) );
remove_filter( 'gwinv_query', array( $this, 'limit_by_field_group' ) );
return $sum;
}
public function limit_by_approved_payments_only( $query ) {
$valid_statuses = array( 'Approved' /* old */, 'Paid', 'Active' );
$query['where'] .= sprintf( ' AND ( e.payment_status IN ( %s ) OR e.payment_status IS NULL )', self::prepare_strings_for_mysql_in_statement( $valid_statuses ) );
return $query;
}
public function get_out_of_stock_message() {
return $this->_args['out_of_stock_message'];
}
/**
* Calculated Product fields limited by their default quantity should be excluded from the order summary.
*
* Since their value is calculated post submission, they function uniquely from other product fields.
*
* @param $order
* @param $form
* @param $entry
*
* @return mixed
*/
public function handle_calculated_product_fields( $order, $form, $entry ) {
foreach( $order['products'] as $field_id => $product ) {
// Check for if target input ID is for the current field and is targeting a Product field default quantity input (i.e. 1.3).
if( $field_id != intval( $this->_args['input_id'] ) || rgar( explode( '.', $this->_args['input_id'] ), 1 ) != '3' ) {
continue;
}
$field = GFAPI::get_field( $form, $field_id );
if( $field->get_input_type() !== 'calculation' ) {
continue;
}
if( ! $this->is_in_stock() ) {
unset( $order['products'][ $field_id ] );
}
}
return $order;
}
public static function get_field_values_sum( $form_id, $input_id ) {
global $wpdb;
$query = self::get_sum_query( $form_id, $input_id );
$sql = implode( "\n", $query );
$result = $wpdb->get_var( $sql );
return intval( $result );
}
public static function get_sum_query( $form_id, $input_id, $suppress_filters = false ) {
global $wpdb;
$query = array(
'select' => 'SELECT sum( em.meta_value )',
'from' => "FROM {$wpdb->prefix}gf_entry_meta em",
'join' => "INNER JOIN {$wpdb->prefix}gf_entry e ON e.id = em.entry_id",
'where' => $wpdb->prepare( "
WHERE em.form_id = %d
AND em.meta_key = %s
AND e.status = 'active'\n",
$form_id, $input_id
)
);
if( class_exists( 'GF_Partial_Entries' ) ) {
$query['where'] .= "and em.entry_id NOT IN( SELECT entry_id FROM {$wpdb->prefix}gf_entry_meta WHERE meta_key = 'partial_entry_id' )";
}
if( ! $suppress_filters ) {
$query = apply_filters( 'gwlimitbysum_query', $query, $form_id, $input_id );
$query = apply_filters( 'gwinv_query', $query, $form_id, $input_id );
$query = apply_filters( "gwinv_query_{$form_id}", $query, $form_id, $input_id );
$query = apply_filters( "gwinv_query_{$form_id}_{$input_id}", $query, $form_id, $input_id );
}
return $query;
}
public static function prepare_strings_for_mysql_in_statement( $strings ) {
$wrapped = array();
foreach( $strings as $string ) {
$wrapped[] = sprintf( '"%s"', $string );
}
return implode( ', ', $wrapped );
}
}
class GWLimitBySum extends GW_Inventory { }
view raw gw-gravity-forms-inventory.php hosted with ❤ by GitHub

How do I install this snippet?

Easy peasy. Just copy and paste the code above into your theme's functions.php file.

Do I need to modify this snippet to work with my form?

You don’t have to modify the snippet itself. Just the parameters with which you initialize it.

<?php
new GW_Inventory( array(
'form_id' => 363,
'field_id' => 2.3,
'stock_qty' => 20,
'out_of_stock_message' => 'Sorry, there are no more tickets!',
'not_enough_stock_message' => 'You ordered %1$s tickets. There are only %2$s tickets left.',
'approved_payments_only' => false,
'hide_form' => false,
'enable_notifications' => true
) );

Parameters

  • $form_id the ID of the form you are working with.
  • $field_id the ID of your product or quantity field. If using a Single Product field, you’ll need to specify the quantity input ID which will always be {field ID}.3 (ie if the field ID is 12, the quantity input ID will be 12.3). If using a separate Quantity field, simply specify the field ID.
  • $stock_qty the number of this item you have available.
  • $out_of_stock_message the message which should be displayed to users when the product limit has been reached. You can get fancy with this and add HTML as well. Be sure to escape any double quotes with a backslash. Here’s a more advanced example:
    $sum_limit_message = '<div style="border: 1px solid #e6db55; background-color: #FFFFE0; padding: 10px;">Sorry, this show is sold out.</div>';
    Better Inventory: Limit Message
  • $not_enough_stock_message the message which should be displayed on the field if the limit has not been reached, but the user’s requested quantity would exceed the product limit.
    Better Inventory: Limit Validation Message
  • $approved_payments_only true/false indicate whether all submissions for this field should be counted against the limit or only submissions with an approved payment. You’ll want to be careful here when using PayPal Standard due to the delay between the form submission and the payment being approved. It could lead to users exceeding the limit.
  • $hide_form by default this snippet will only hide the field when the limit has been reached. If you would rather hide the entire form, set this to true.
  • $enable_notifications enable the ability to create notifications that are sent when the stock of a product (or any configured field) has been exhausted

Shortcodes

  • Remaining
    Show the quantity remaining for the specified input and limit. [gravityforms action="remaining" id="1" input_id="2.3" limit="50"]

  • Sum
    Show the current sum of quantities ordered for this field across all entries. [gravityforms action="sum" id="1" input_id="2.3"]

Did this resource help you do something awesome with Gravity Forms? Then you'll absolutely love Gravity Perks; a suite of 31+ essential add-ons for Gravity Forms with support you can count on.

Comments

  1. Karie says

    Thank you for this code. I am using this on a form where there are a limited number of add on tickets (using gravity forms product) that can be sold as part of a registration. How can I show the quantity of add on tickets remaining by this product?

    Reply

    • Samuel Bassah says

      Hi Karie,

      You can use a shortcode similar to this “[gravityforms action="remaining" id="1" input_id="2.3" limit="50"]” to show the tickets left, below the form. But you can also check out our GP Limit Choices Perk, that will allow you to show the remaining limit by the product choices.

      Best,

  2. Lena says

    Hi,

    i have 3 different fields with quantities. But when one of them is sold out, the out of stock message is shown. Even when there is quantity left in one of the other 2 fields.

    I tried https://gravitywiz.com/documentation/apply-class-based-snippet-different-forms/ , but i am not sure if i used it right. This is how it looks now: http://snippi.com/s/lhou448

    With this, the snippet isn’t working anymore. Do i have to add this ‘modifier’ too?

    Thank you already !

    Lena

    Reply

    • Ryan Donovan says

      Hello Lena, Thank you for that snippi link to your classes. It looks like your fields are not being linked to the quantity field and just the field as a whole. So you would need 16.3,28.3,29.3 to target the quantity of each field. I have just tested this and it should be working correctly.😃

  3. Gregor Altenburger says

    Hi,

    on the following page two items are sold out “Sitzsack in der vordersten Reihe”, “Garten-Loge (VIP-Ticket)”. You can find the soldout message “Leider gibt es zu dieser Kategorie keine Tickets mehr! (not available anymore)”. The prices for the sold out items are 53 CHF and 69CHF, together 122 CHF.

    Even if they are sold out, the total sum in the and is always with these 122 CHF on the top. I used the attached code in function.php

    May you help me with that?

    Kind regards Gregor

    CODE: http://snippi.com/s/krweapq

    Reply

    • Ryan Donovan says

      Hello Gregor, I am not 100% following. Are the items still showing up or is the price still showing at the end? Are you using the pricing in another calculation on your form? This one would require a bit more investigation to find out the total sum is being added with extra numbers. If you have a Gravity Perks license could you please reach out to us through our support channel and we would be more than happy to take a deeper dive into this.

    • Scott Buchmann says

      Hi Gregor,

      Better Inventory doesn’t expect both a field_id and an input_id. You should only include the field_id in the args, and set that ID to the quantity field. For example:

      http://snippi.com/s/bh45h4r

      If you’re still running into trouble with the snippet after making that adjustment, we’re happy to help via support if you have a Gravity Perks Advanced or Pro license.

  4. Igor says

    I am using Drop Down with Pricing Fields (Products), is there a way with this code or with your paid plugin to connect it to inventory of another product? Let say I have a kit that has products A&B in it and there is an option to substitute B to C for a higher price. I also have stand alone products B & C that have their own inventory levels, can I use the inventory in the B & C products to show that in the drop down? Let say that if customer wants to choose option “C” and it is out of stock as a stand alone product then customer would see a message out of stock?

    Reply

    • Ryan Donovan says

      Hello Igor, this is an interesting question. Gravity Forms Limit Choices is a great way to provide inventory per choice in a Drop Down field. This can be combined with our very powerful Field Groups snippet to make the inventory specific to the choice and any other variations selected in other fields including options + other fields.

  5. Gregor says

    Is it possible to add a custom message, if there are „as example“ only 5 pieces in stock left? Right now I only get a “out of stock“ „not enough stock” message.

    Kind regards Gregor

    Reply

    • Ryan Donovan says

      Hey Gregor, you would have to alter the parameters with which you initialize it. So, in this case, you would alter the ‘not_enough_stock_message’ parameter to meet your needs. Please note that when you modify, you are not changing the code, rather you will be adding this to the bottom with your custom code.

  6. Elliot Walters says

    Hi, I am using this snippet, and I thought all was working well, however when I reached my stock limit of one of my items, the value of the out of stock item was added to the total of the form, despite the out of stock message being displayed and therefore the product could not be selected.

    The item was not being listed on the order summary, just the charge added to the total.

    This only appears to be occurring with items which are linked to quantity fields; items which are just product fields appear to be performing correctly, ie not adding cost once stock is exhausted.

    Any ideas?

    Reply

  8. David says

    Hi,

    First the snippets works great. But i have another question. Is the stock calculated per day? Or do we need to adjust the stock every single day?

    For a client we created a form (under construction) for rental purposes. The client has 10 vehicles to rent with different timeslots. So when will the stock be deducted? After the payment and how can the customer “fill his own stock again”?

    Thanks in advance.

    Regards, David

    Reply

    • Ryan Donovan says

      Hey David, these are counted per entry. If you remove an entry the stock will return to normal. The stock will be deducted as soon as the form submits, so if you have a payment gateway that requires validation before submitting the data, the entry will be counted after completion.

  9. Nik Rivas-Barnao says

    I have found what looks to be a compatibility issue with GF Stripe addon. I am running the same settings across multiple forms using an array of form ids > http://snippi.com/s/9j2ke79 If I change hide_form to true and one fo the forms reaches the submission limit, the credit card number and CVC, postcode inputs are removed from all other forms just leaving the credit card name input for the CC field.

    For some reason the hide_form wrongly removes those inputs from other forms. Any ideas why this would be happening?

    Reply

  10. Nik Rivas-Barnao says

    Hi, I am getting a fatal error when using this snippet. http://snippi.com/s/p9dfnvd It’s installed in functions.php, I have tried your example with the same issue (with the opening php tag removed).

    This is the error Got error ‘PHP message: PHP Fatal error: Uncaught Error: Class ‘GW_Inventory’ not found in /home/xyz/webapps/xyx/wp-content/themes/hello-theme-child-master/functions.php:26\nStack trace:\n#0 /home/xyz/webapps/xyz/wp-settings.php(497): include()\n#1 /home/xyz/webapps/xyz/wp-config.php(85): require_once(‘/home/xyz…’)\n#2 /home/xyz/webapps/xyz/wp-load.php(37): require_once(‘/home/xyz…’)\n#3 /home/xyz/webapps/xyz/wp-admin/admin-ajax.php(22): require_once(‘/home/xyz…’)\n#4 {main}\n thrown in /home/xyz/webapps/xyz/wp-content/themes/hello-theme-child-master/functions.php on line 26′, referer: https://www.xyz.com.au/wp-admin/admin.php?page=gf_edit_forms&id=3

    Any ideas why it is causing a fatal error? Thanks Nik

    Reply

  11. theEdwardian says

    Hey guys, I’m thrilled to use this snippet however I’m a bit confused about the parameters portion. I understand how to include this in my function.php file. The parameter code, do you append this to the main code? Where do you paste it if not to the function.php?

    Reply

    • Ryan Donovan says

      Hello, excellent question. You would add the new GW_Inventory( array() ); parameters to the end of the snippet. Whatever fields you alter there will then be modified within the snippet allowing you to be able to customize it to you needs.😀

    • theEdwardian says

      Hey Ryan, TYVM! I thought so however I am not successful. Seems I’m triggering a critical error and the white screen of death. I have three product fields with quantities enabled and the ID as 5.3, 6.3 & 7.3 following the multiple instance same form format. I downloaded the snippet from github as well. I commented out two of the field IDs and then all but still getting wsd. What am I missing?

    • theEdwardian says

      Yes, I saw that link in an earlier comment and used the same form multiple instances example by indicating the same form ID in each case. When that didn’t work, I commented out 2 of them to no avail. Just not sure where to look so I’ll start over. Thanks!

    • theEdwardian says

      OMG! I figured it out. How simple. When I pasted the downloaded snippet code to my function.php, I included the <?php tag to the code already there. Duh. It’s nice to let folks know their solutions, it helps others.

  12. Colleen says

    I tried this on a multisite in the subsite’s child theme folder and got the following error: “Uncaught Error: Class ‘event_Inventory’ not found in /home/…” Does this work in multisite?

    Reply

    • Ryan Donovan says

      Hello Colleen, This snippet should work on a multisite but it would depend on your setup. If you like you could drop us a support request and we could take a closer look at your site. Thank you!

  13. Dom says

    Hey.

    Thank you for the plugin. Very useful.

    Im using ACF for the tickets limit. Would you be able to tell me how can I add stock_qty as a acf field ( which essentially various from page to page)?

    Thank you.

    Reply

    • Dom says

      I think I rushed with the answer slightly, sorry.

      It seems that the get_field is not picking the value from the post as it cat see the ID

      How can I get the value of a field in function file?

      Thank you.

    • Ryan Donovan says

      Hey Dom, you could set the parameter as a function. Something like 'stock_qty' => function() { global $post; get_post_meta( $post->id, 'stock', true ); } This would get the “stock” custom field for any post on which the form is displayed. If you still have questions regarding this could you drop us a support request for this? We’ll be happy to dig in.

  14. Chelsea says

    Hello!

    I would this snippet be used for multiple forms? Would you just have to copy the form specific part of the code or can it really only be used for 1 form?

    Reply

  16. Jonathan Appleton says

    Hi Thanks so much for this. How can we use the spaces left shortcode to fill a fields default value to use for conditionals please

    Show the quantity remaining for the specified input and limit. [gravityforms action="remaining" id="1" input_id="2.3" limit="50"]

    Reply

  17. Steve Brettler says

    Hi this code snippet creates a fatal error- i get this in my error log PHP Warning: strpos(): Empty needle in /home4/hiddeob4/public_html/wp-includes/functions.php on line 4360

    Does this have to do with your little snipit or is it some deeper issue?

    Reply

  18. Justin Rogers says

    Any chance this can work on a select/dropdown field? Was hoping to have an option where the user could select from one event date or the other (and each event date is limited to 4 registrations). If I’m reading this correctly, it only seems to work on a single field (that doesn’t have variations). I have a bit of a complicated situation where I’m using a WooCommerce product that can only be purchased 8 times (a workshop) and then there is an option add-on where users can buy it 4x per date – so it’s almost like I have dual stock management going on where I need to manage stock for the master product and then also at the variation level but I don’t believe there is a way for WooCommerce to do that either. That’s why I was hoping within the Gravity Forms Product add-on I could manage the stock there somehow.

    Reply

    • David Smith says

      Hi Justin, Gravity Forms Limit Choices is a great way to provide inventory per choice in a Drop Down field. This can be combined with our very powerful Field Groups snippet to make the inventory specific to the choice and any other variations selected in other fields (included a Date field or a Drop Down field with available dates).

  19. Jonathan says

    Hi David,

    Thank you for this code. I am using gravity forms product add-ons in Woocommerce and someone can place an order for more stock than is available, so your code snippet works great.

    However what I need to do is vary the stock quantity (used in the GW_Inventory parameters) based around the current product stock quantity. No matter what I try to do I cannot get the code to recognise either the product id or the post id.

    If I hard code the product id then something like this works fine.

    http://snippi.com/s/dchklx9

    I can happily output the post / product id to the page but when I try the same in your GW_Inventory parameters it returns a null value, and the main code fails.

    Anything you could do to point me in the right direction would be much appreciated.

    Thanks

    Reply

  20. Josh says

    I have this integrated with a payment gateway Stripe. In the new release of Gravity Forms Stripe, we have the option to have the secure checkout be redirected to a “stripe checkout” form ( hosted by Stripe ) I have found that the inventory is subtracted even if the payment isn’t complete..

    Is there a way to only take inventory if payment is successful ?

    Thanks.

    Reply

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