admin inline form id attribute numbering order and uniqueness is lost

[m0nonoke]

Inline forms that are added using the "Add another ..." button created by contrib/admin/media/js/inlines.js lose their id attribute ordering and uniqueness if they are deleted out of reverse order.

To demonstrate the effect take the following steps:

1. Create an admin form eg. MyAdmin with a tabular inline form eg. MyInline.

2. Add 3 or more inline forms using the "Add another MyInline button"

3. The HTML for the formset looks something like <tr id="myinline_set-0" class="dynamic-myinline_ser row1"> where myinline_set is the prefix. For 4 forms the ids are therefore myinline_set-0, myinline_set-1, myinline_set-2, myinline_set-3.

4. Delete the second form using the delete link. The ids are now myinline_set-0, myinline_set-2, myinline_set-3.

5. Add another inline using the "Add another MyInline button". The ids now show The ids are now myinline_set-0, myinline_set-2, myinline_set-3, myinline_set-3.

It looks like the problem occurs because of the way the id is computed in contrib/admin/media/js/inlines.js.

# contrib/admin/media/js/inlines.js Line 59-62 
59 row.removeClass(options.emptyCssClass)
60    .addClass(options.formCssClass)
61    .attr("id", options.prefix + "-" + nextIndex)
62    .insertBefore($(template));

nextIndex is just the TOTAL_FORMS value of the management form plus one. The solution would involve resetting the values for all inline forms.

[Julien Phalip]

I confirm this is a bug. This can be fixed by keeping nextIndex static and not refreshing it with the TOTAL_FORMS value each time. See patch attached.

[Julien Phalip]

See #13674 for a related (but different) bug.

[Julien Phalip]

RFC'ing my own patch but hopefully this is a simple-enough fix to allow me to do that :)

[Russell Keith-Magee]

In [15422]:

Fixed #14303 -- Ensure that the ids created for new inlines are unique after interstitial deletions have occurred. Thanks to m0nonoke for the report, and Julien Phalip for the patch.

[Russell Keith-Magee]

In [15423]:

[1.2.X] Fixed #14303 -- Ensure that the ids created for new inlines are unique after interstitial deletions have occurred. Thanks to m0nonoke for the report, and Julien Phalip for the patch.

Backport of r15422 from trunk.

[Jacob]

Milestone 1.3 deleted