I also tested on blank form, same issue... Nested subform starts counting on parent subform row num, eg row "order_articles2" subform starts at "order_articles3__order_addons__order_addons0".

Additional information: after saving form (only parent subform rows saved) adding nested subform rows results in correct row count. So this issue occurs only on new added subform rows, after saving subform row adding nested subform rows works fine.

Hi, thanks for reporting this. I am not completely sure that I understand the problem, so just to be sure:

You are talking about the id's of the subform fields, correct? And the problem is that the numbering of the subform rows is incorrect? I am not completely sure what you mean with that...

Can you provide more information, e.g. a screenshot of the DOM-inspector of the fields, with the subforms visible, and the incorrect id's, and how the id's should be instead, from your point of view?

Additionally: Why is the naming of the id's of the fields relevant to you?

edit: Additionally, can you please add a short testing instruction (maybe include relevant form xml definition) so we can reproduce the issue easily, and see where exactly things are not getting numbered correctly

Hi cotinga,
thanks for your reply.

Its not easy to explain what happens, so I put some code here as you suggested. Its not the id only, the issue affects name too - so saving fails. The name of the parent subform is

jform[order_articles][order_articles0][article],

for addons in the first row nested subform it should be

jform[order_articles][order_articles0][order_addons][order_addons0][addon], but is
jform[order_articles][order_articles1][order_addons][order_addons0][addon].

Here is the code example:

<tbody class="rows-container-sr-0 ui-sortable">
<tr class="subform-repeatable-group subform-repeatable-group-sr-0" data-base-name="order_articles" data-group="order_articles0" data-new="true">
  <td data-column="Article"><div class="control-group">
	  <div class="controls"><input name="jform[order_articles][order_articles0][article]" id="jform_order_articles__order_articles0__article" value="" type="text"></div>
  </div></td>
  <td data-column="Addons"><div class="control-group">
     <div class="controls"><input name="jform[order_articles][order_articles0][order_addons]" value="" id="jform_order_articles__order_articles0__order_addons" type="hidden"><div class="row-fluid">
    <div class="subform-repeatable-wrapper subform-table-layout subform-table-sublayout-section">
<div class="subform-repeatable" data-bt-add="a.group-add-sr-1" data-bt-remove="a.group-remove-sr-1" data-bt-move="a.group-move-sr-1" data-repeatable-element="tr.subform-repeatable-group-sr-1" data-rows-container="tbody.rows-container-sr-1" data-minimum="0" data-maximum="1000">
    <table class="adminlist table table-striped table-bordered"><thead>
      <tr><th>Addon<br><small style="font-weight:normal"></small></th><th style="width:8%;"><div class="btn-group"><a class="btn btn-mini button btn-success group-add-sr-1" aria-label="Hinzufügen"><span class="icon-plus" aria-hidden="true"></span></a></div></th></tr>     
    </thead><tbody class="rows-container-sr-1 ui-sortable">
      <tr class="subform-repeatable-group subform-repeatable-group-sr-1" data-base-name="order_addons" data-group="order_addons0" data-new="true">
        <td data-column="Addon"><div class="control-group">
	   <div class="controls"><input name="jform[order_articles][order_articles1][order_addons][order_addons0][addon]" id="jform_order_articles__order_articles1__order_addons__order_addons0__addon" value="0" type="text"></div>
           </div></td>

How can I put code in there? Dont get it... :-(

Can you post a copy of your xml? I tested this working fine, although didn’t check the counting it did save and reload without issue with multi-deep nested forms

testform.xml ist main form, subform_1.xml first subform, subform_2.xml nested subform...
testform.zip

More information on this at #22690

I have a fix for this, I just have to figure out how to do a pull request. The problem stems from when a new row is added to the nested subform, it uses the count of the nested subform to determine a suffix for the parent subform selector, which effectively adds a new parent row instead of a child row.

In media/system/js/subform-repeatable-uncompressed.js, I've changed this:

        // fix names and ids for fields in $row
	$.subformRepeatable.prototype.fixUniqueAttributes = function(
		$row, // the jQuery object to do fixes in
		_count, // existing count of rows
		_group, // current group name, e.g. 'optionsX'
		_basename // group base name, without count, e.g. 'options'
	) {
		var group = (typeof _group === 'undefined' ? $row.attr('data-group') : _group),
			basename = (typeof _basename === 'undefined' ? $row.attr('data-base-name') : _basename),
			count    = (typeof _count === 'undefined' ? 0 : _count),
			countnew = Math.max(this.lastRowNum, count),
			groupnew = basename + countnew;

		this.lastRowNum = countnew + 1;
		$row.attr('data-group', groupnew);

to this:

        // fix names and ids for fields in $row
	$.subformRepeatable.prototype.fixUniqueAttributes = function(
		$row, // the jQuery object to do fixes in
		_count, // existing count of rows
		_group, // current group name, e.g. 'optionsX'
		_basename // group base name, without count, e.g. 'options'
	) {
		var group = (typeof _group === 'undefined' ? $row.attr('data-group') : _group),
			basename = (typeof _basename === 'undefined' ? $row.attr('data-base-name') : _basename),
			count    = (typeof _count === 'undefined' ? 0 : _count),
			subform_selector = this.getRowSelector($row[0]), //select this subform
			countnew = Math.max($row.closest('.subform-repeatable').find(subform_selector).length - 1, count), //and count its rows
			groupnew = basename + countnew;

		this.lastRowNum = countnew + 1;
		$row.attr('data-group', groupnew);

and I've added this function:

    //Return a row selector for this particular subform or subform template
    $.subformRepeatable.prototype.getRowSelector = function(row) {
    	let select = row.querySelector('.subform-repeatable-group'), row_classlist;
    	if(select === null) {
    		// DOMElement
                row_classlist = row.classList;
        }
	else {
		// documentFragment
                row_classlist = select.classList;
	}
        var selector = [];
        for(let k = 0, len = row_classlist.length; k < len; k++) {
            selector[k] = row_classlist[k];
        }
        selector.unshift('');
        return selector.join('.');
    };`

The problem observed now disappears, and the field names and ids are correct.
subform-repeatable-uncompressed.zip

I will check this this weekend. I need to take a look at it, I am not sure whether I really understand the problem yet.

Your fix seems a bit like an overkill though. Each subform should keep its own count, and not mix it up with other instances. Might be a hint, that something is broken on another place. But, as I said, I will take a look

I am well known for my overkill fixes.

Can you guys please check PR #22757 which should fix this?

Set to "closed" on behalf of @Quy by The JTracker Application at issues.joomla.org/joomla-cms/22441