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Set Number of List Field Rows by Field Value

Increase or decrease the number of rows in a List field by the value of another field. Ordering three tickets? Show three list field rows for ticket information.

Last updated | Written by 239 Comments

  • April 25, 2020: Added compatibility for the GravityView Edit Entry screen.

  • August 22, 2019: Fixed intermittent issue where loading script in Gravity Forms Gutenberg block caused Parent Selector to disappear.

  • October 5, 2013: Updated snippet to use a class format for easier instantiation which also adds support for applying to multiple forms and multiple fields on the same form.

  • January 26, 2013: Updated to better select the current list field table rows.

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<?php
/**
* Gravity Wiz // Gravity Forms // Set Number of List Field Rows by Field Value
*
* Add/remove list field rows automatically based on the value entered in the specified field. Removes the add/remove
* that normally buttons next to List field rows.
*
* @version 1.1
* @author David Smith <david@gravitywiz.com>
* @license GPL-2.0+
* @link http://gravitywiz.com/2012/06/03/set-number-of-list-field-rows-by-field-value/
*/
class GWAutoListFieldRows {
private static $_is_script_output;
function __construct( $args ) {
if ( defined( 'REST_REQUEST' ) && REST_REQUEST ) {
return;
}
$this->_args = wp_parse_args( $args, array(
'form_id' => false,
'input_html_id' => false,
'list_field_id' => false
) );
extract( $this->_args ); // gives us $form_id, $input_html_id, and $list_field_id
if( ! $form_id || ! $input_html_id || ! $list_field_id )
return;
add_filter( 'gform_enqueue_scripts_' . $form_id, array( $this, 'pre_render' ) );
}
function pre_render( $form ) {
?>
<style type="text/css"> #field_<?php echo $form['id']; ?>_<?php echo $this->_args['list_field_id']; ?> .gfield_list_icons { display: none; } </style>
<?php
add_filter( 'gform_register_init_scripts', array( $this, 'register_init_script' ) );
if( ! self::$_is_script_output )
$this->output_script();
return $form;
}
function register_init_script( $form ) {
// remove this function from the filter otherwise it will be called for every other form on the page
remove_filter( 'gform_register_init_scripts', array( $this, 'register_init_script' ) );
$args = array(
'formId' => $this->_args['form_id'],
'listFieldId' => $this->_args['list_field_id'],
'inputHtmlId' => $this->_args['input_html_id']
);
$script = "new gwalfr(" . json_encode( $args ) . ");";
$key = implode( '_', $args );
GFFormDisplay::add_init_script( $form['id'], 'gwalfr_' . $key , GFFormDisplay::ON_PAGE_RENDER, $script );
}
function output_script() {
?>
<script type="text/javascript">
window.gwalfr;
(function($){
gwalfr = function( args ) {
this.formId = args.formId,
this.listFieldId = args.listFieldId,
this.inputHtmlId = args.inputHtmlId;
this.init = function() {
var gwalfr = this,
triggerInput = $( this.inputHtmlId );
// update rows on page load
this.updateListItems( triggerInput, this.listFieldId, this.formId );
// update rows when field value changes
triggerInput.change(function(){
gwalfr.updateListItems( $(this), gwalfr.listFieldId, gwalfr.formId );
});
}
this.updateListItems = function( elem, listFieldId, formId ) {
var listField = $( '#field_' + formId + '_' + listFieldId ),
count = parseInt( elem.val() );
rowCount = listField.find( 'table.gfield_list tbody tr' ).length,
diff = count - rowCount;
if( diff > 0 ) {
for( var i = 0; i < diff; i++ ) {
listField.find( '.add_list_item:last' ).click();
}
} else {
// make sure we never delete all rows
if( rowCount + diff == 0 )
diff++;
for( var i = diff; i < 0; i++ ) {
listField.find( '.delete_list_item:last' ).click();
}
}
}
this.init();
}
})(jQuery);
</script>
<?php
}
}
// EXAMPLE #1: Number field for the "input_html_id"
new GWAutoListFieldRows( array(
'form_id' => 240,
'list_field_id' => 3,
'input_html_id' => '#input_240_4'
) );
// EXAMPLE #2: Single Product Field's Quantity input as the "input_html_id"
new GWAutoListFieldRows( array(
'form_id' => 240,
'list_field_id' => 6,
'input_html_id' => '#ginput_quantity_240_5'
) );
view raw gw-gravity-forms-list-field-rows-by-field-value.php hosted with ❤ by GitHub

Found this interesting question on the Gravity Forms forum:

I’m selling tickets. So each ticket needs to be associated with a name/email/etc…

Basically, the user needs a way to gather a set of data per ordered product/ticket. My first instinct was to simply recommend using the List field. The user could specify the number of tickets and then add/remove however many rows they need.

I kept thinking on it and realized it would be really nice if the number of List field rows increased/decreased automatically based on the number of selected tickets. Here’s a snippet to do just that!

How do I install this snippet?

Just copy and paste the snippet above into your theme’s functions.php file.

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

You just need to create your own instance of the GWAutoListFieldRows class. You’ll find two examples at the bottom of the snippet. Comment them out and then add your own! All you need to set is the $form_id, the $list_field_id, and the HTML id of your input as the $input_html_id property.

Looking to make all the rows required? Just use our Require All Columns of List Field Snippet and you should be all set!

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. Nicholas Woollard says

    I used your “download code” button. The beginning now looks like this:

    class GWAutoListFieldRows {

    private static $_is_script_output;

function __construct( $args ) {

    if ( defined( 'REST_REQUEST' ) && REST_REQUEST ) {
        return;
    }

    $this->_args = wp_parse_args( $args, array(
        'form_id'       => 18,
        'list_field_id' => 32,
        'input_html_id' => '#input_18_63'
    ) );

    etc…(nothing else changed)

    Reply

    • Ryan Donovan says

      Hello Nicholas, thank you for that information. When using the snippet, You just need to create your own instance of the GWAutoListFieldRows class. You’ll find two examples at the bottom of the snippet. Comment them out and then add your own! All you need to set is the $form_id, the $list_field_id, and the HTML id of your input as the $input_html_id property. // EXAMPLE #1: Number field for the "input_html_id" new GWAutoListFieldRows( array( 'form_id' => 240, 'list_field_id' => 3, 'input_html_id' => '#input_240_4' ) );

      // EXAMPLE #2: Single Product Field's Quantity input as the "input_html_id" new GWAutoListFieldRows( array( 'form_id' => 240, 'list_field_id' => 6, 'input_html_id' => '#ginput_quantity_240_5' ) );

      No need to change the code at the top. If you have a Gravity Perks license we would be more than happy to take a deeper dive into your forms. You could drop us a line through our support channel here. Thanks! 😃

  2. Nicholas Woollard says

    Reading all the comments about how easy this was to implement, I am feeling a right twit because nothing seems to happen.

    1) I copied the code snippet to my child functions.php file. 2) I removed the leading <!PHP 3) I configured the inputs:

            'form_id'       => 18,
        'input_html_id' => '#input_18_63',
        'list_field_id' => 32
    ) );

    Where 32 is the ID of my list field and 63 the ID of my source number field. The source field appears just above the list field.

    The changes to functions.php saved without errors.

    It seems to have exactly NO effect on my form: the list field still displays the +/- buttons and the value entered in the source number field doesn’t change the number of list field rows.

    I’m probably doing or overlooking something very obvious and stupid. I would appreciate any thoughts/help.

    Reply

    • Ryan Donovan says

      Hello Nicholas, I am sorry that you are having this issue. I see that you have done things correctly. Are you keeping the whole configuration? new GWAutoListFieldRows( array( 'form_id' => 18, 'list_field_id' => 32, 'input_html_id' => '#input_18_63' ) ); I just tested the code and everything seems to be working correctly on my end. Could you ensure that you have included the function at the top of the configuration as well as matched the formating? Thank you! 😃

  3. lalit pendhare says

    Hello Gravitywiz Team,

    I’m looking for your solution(https://gravitywiz.com/set-number-of-list-field-rows-by-field-value/) for showing row from passing value in a text field.

    But I’m used ajax gravity form so that js code added in above the Html start so it is pushing the jquery error and then my custom js not work on that form.

    output_script() js function called in above the html after clicking next.

    We are used save and continue form with ajax.

    Without ajax is working fine but we need to use ajax form as our client requirement.

    Looking for your help.

    Reply

    • Ryan Donovan says

      Hello Lalit, could you please try our Custom JavaScript plugin and see if you are still experiencing this issue. This plugin allows you to easily add custom JavaScript to your Gravity Forms that loads in the appropriate context and doesn’t interfere with other AJAX-enabled forms. Thanks!

  4. Eduard Coumans says

    How do I make all additional fields required. If I now fill in 1 field (it doesn’t matter which field), the visitor does not have to fill in the rest of the fields. How can I add this requirement. The visitor must complete all fields.

    Reply

  5. Nick says

    Hi there,

    I noticed there is a dangerous issue with running this using a vanilla quantity field. If a user accidentally (or on purpose for that matter) enters a huge quantity (2000) it will crash the browser as it tries to render 2000 input boxes. The solution is to enable drop down selection on the quantity field or use a JavaScript input mask to limit the input. It might be worth warning people about that.

    I was also trying to use this snippet with http://gravitywiz.com/better-inventory-with-gravity-forms/ but the stock validation doesn’t seem to work when you combine the two snippets. When combined it still lets you select inputs when there isn’t enough stock and you are using two products on one form. When there is no stock the field disables but a user can still use the submission button. When there is no stock you get the out of stock message displayed correctly and the list input is disabled but the total price acts as if you have one item selected and it allows you to continue to submission. I can’t disable the form because there are other products with stock that need to be sold. I’ve tried setting the default value in the quantity field as 0, I’ve tried setting the default selection as zero. I’ve tried to also set the default value of the product field as zero with a php function rather than gravity forms form GUI. But every time it runs out of stock it defaults the value to 1 unit and allows you to submit.

    I don’t know enough about php coding on WordPress to build this from the ground up. My guess is it is something to do with how the list item is first being called. It defaults to one item when the solution to this issue is to set the starting default as zero. I believe there needs to be an amendment to the “Set Number of List Field Rows by Field Value” snippet.

    Reply

    • David Smith says

      Hey Nick, that’s a good call. I’ve added this to the bug list for this snippet. We’ll get it in the queue to be addressed in the code.

      Do you have an example of your Better-Inventory-enabled form? Also, if you could include your configuration of the Better Inventory snippet via a snippi, that’d be very helpful.

      Also, if you’re a Gravity Perks customer, feel free to submit a support ticket for faster response times.

  7. Jennifer says

    Hi, I have just discovered that when I include this code in my functions.php, the Parent Page selector disappears in under Page Attributes when editing a Page. It makes no sense since the snippet should only impact the form, not the page editor. The form itself works fine with the snippet.

    I’m wondering if it has anything to do with the (jQuery) call in the function because there was a second snippet that also causes this error and it also included Javascript.

    https://docs.gravityforms.com/making-a-field-read-only/

    I created a pared down site using just this code snippet in the Twentynineteen theme to confirm that it’s not a problem with my theme. The site is password protected but I can send the login info if you are interested in taking a look at this unusual error.

    Reply

  8. Sarah says

    Hello, I’m trying to get this to work, but it shows a 404 error. I’m confused about the input_html_id… If my form id is 63 and my number field is 29, should it be:

    ‘input_html_id’ => ‘#input_63_29’

    Or am I missing something? Do I need to add anything to the field itself?

    I’m trying to use this to count the number of rows in my list field so that I can use conditional logic to show file upload fields. I’m using Slim Image Cropper, which doesn’t allow multiple file uploads, so I need to dynamically show these fields based on how many rows there are in a list field. Unfortunately I can’t say “if there are 4 rows, show 4 file upload fields”, so this is my more complicated workaround.

    Thank you!

    Reply

    • David Smith says

      Hi Sarah, this doesn’t count the rows, it sets the rows. If you enter 4 in the number field, it adds 4 rows to the corresponding List field. The demo has a good example.

    • Sarah says

      Sorry, I couldn’t reply to my previous comment… I’m aware it sets the rows, I just have further plans for it once I get it to work.

      Problem is, I can’t get this to work. I suspect it’s the $input_html_id…

      Using Example 1, if my form id is 63, my list field id is 16, and my number field is 27, should it be:

      new GWAutoListFieldRows( array( ‘form_id’ => 63, ‘list_field_id’ => 16, ‘input_html_id’ => ‘#input_63_27’ ) );

      Using this gives me a 503 Service Unavailable error…

      Thank you!

    • Sarah says

      Forgive my ignorance, but is there a syntax error on line 37? It’s highlighted in red.

    • David Smith says

      Hey Sarah, your config looks right based on the field IDs. The red highlight is just the syntax highlighter getting a little confused. The syntax is valid.

      I also confirmed that the demo is still working. If you’re still having trouble getting this working on your end, we do have a plugin version of this functionality available for our Gravity Perks customers.

  9. Fredrik Sundlöf says

    Hi, Right now I am using this function as you have describe here and it works perfect. The user enters a number in a field and the same number of rows is shown. But how about this. Before number of rows the user select between 4 different settings as radio buttons and this will then create the number of columns the list field will generate.

    Like this: Order shirts for the team!

    Printing: – None – Name – Number – Name and Number

    Number of shirts:

    If the customer choose “Name” and 8 shirts, the list filed shows 2 columns (Name and size (Dropdown) and 8 rows. If the customer choose “Name and Number” and 4 shorts the list field shows 3 columns (Name, number and size (Dropdown) and 4 rows.

    The Dropdown and number of rows is already in place and is working. Any idea about the conditional columns function?

    Thanks! Fredrik Sundlöf

    Reply

    • David Smith says

      Hi Fredrik, this is a cool idea. We don’t have a ready solution for this but definitely something we’ll consider for a future version of this snippet.

    • Fredrik Sundlöf says

      I did solve this by creating multiply list fields with the different columns that I wanted and then show each at a time with conditional logic from the radio buttons.

      :)

  10. Adam Cates says

    I’m trying to run two instances of the code in one form. The first instance is running fine. But the second is not working. I double checked the field Id’s and everything seems to be correct. Any ideas??

    new GWAutoListFieldRows( array( ‘form_id’ => 8, ‘list_field_id’ => 22, ‘input_html_id’ => ‘#ginput_quantity_8_16’ ) );

    new GWAutoListFieldRows( array( ‘form_id’ => 8, ‘list_field_id’ => 20, ‘input_html_id’ => ‘#ginput_quantity_8_24’ ) );

    Reply

    • David Smith says

      Hi Adam, I tested this configuration locally and it works as expected. Just FYI, if you’re a Gravity Perks customer, you may be interested in our early-access GF Auto List Field perk available by request. It provides this same functionality but without the need to touch code.

  11. christian manaoat says

    hello there,

    i don;t know if this forum is active, but im confused about $input_html_id where to find it? sorry im non dev guy.

    Reply

  12. Alex says

    Hello! How do I put a value in the fields of this listing мф JS? For example, this does not work

    $jq(‘.gfield_list_2_cell0 :input’).val(start);

    Reply

  13. sandy says

    How can I enable the “add” and “remove” buttons to show in the same form for another list field that is not using this script to function?

    Reply

  14. Will says

    Is there a way to just indicate the number of list field rows that should be shown upon page load? My form will not have another field to indicate the number of rows required… I just need to show a minimum number of them for aesthetic purposes.

    I don’t need/ wouldn’t want them to be required fields.

    Just need say five rows to be shown on page-load, and allow the user to add more using the add another row icon.

    Reply

    • Kevin ONeill says

      I’d like to know about this as well. But in my case they would be required fields.

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