only expand one parent when displaying radio buttons (report + patch)
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #297197. -->
Reported by: [Alice Heaton](https://www.drupal.org/user/60899)
>>>
<h3>Problem</h3>
<p>Suppose that:</p>
<ul>
<li>
We have a hierarchical taxonomy which has multiple parents enabled (so that one given term can have several parents) but is single selection (so only one term can be selected) ;
</li>
<li>
We use Taxonomy Manager to display such a tree, such that there is a default value, and that default value is one that has multiple parents.
</li>
</ul>
<p>Then Taxonomy Manager expands all the possible parents of the default value. But because this is a single selection tree it uses radio buttons, so only one of the possible terms is selected. This results in a tree which has expanded branches by default even though no items are selected under those branches.</p>
<!--break--><h3>Suggestion</h3>
<p>Only one of the possible parents should be expanded.</p>
<h3>How to reproduce</h3>
<p>I did this using the Content Taxonomy module (though I believe the problem is within the realm of Taxonomy Manager - see the patch). </p>
<ol>
<li>Create a taxonomy T (as described above : multiple parents enabled ; but only single selection).</li>
<li>Add terms to that taxonomy, such that some terms have multiple parents</li>
<li>Create a new node type, with a field of type Content Taxonomy, using the tree widget and the taxonomy T</li>
<li>Create a new node, select a value for the field (using one of the terms that has multiple parents)</li>
<li>Save that node, then edit it again. All the branches of the tree that contain the value are expanded ; but only one of the possible values is selected</li>
</ol>
<h3>Patch</h3>
<p>This patch ensures that when using radio buttons only one parent is expanded ; and it ensures that the right item (the one with the expanded parents) gets marked as checked.</p>
<pre>Index: taxonomy_manager/taxonomy_manager.module<br>===================================================================<br>--- taxonomy_manager/taxonomy_manager.module (revision 1269)<br>+++ taxonomy_manager/taxonomy_manager.module (working copy)<br>@@ -333,7 +333,7 @@<br><br> $terms_to_expand = array();<br> if (count($element['#default_value']) && !$element['#expand_all']) {<br>- $terms_to_expand = taxonomy_manager_tree_get_terms_to_expand($tree, $element['#default_value']);<br>+ $terms_to_expand = taxonomy_manager_tree_get_terms_to_expand($tree, $element['#default_value'], $element['#multiple']);<br> }<br><br> taxonomy_manager_tree_build_form($index = 0, $tree, $element['#elements'], $element, $element['#parents'], !$element['#pager'], $element['#siblings_page'], $element['#default_value'], $element['#multiple'], $terms_to_expand);<br>@@ -380,7 +380,7 @@<br> /**<br> * marks parent terms to expand if a child terms is selected by default<br> */<br>-function taxonomy_manager_tree_get_terms_to_expand($tree, $default_values) {<br>+function taxonomy_manager_tree_get_terms_to_expand($tree, $default_values, $multiple) {<br> $terms = array();<br> foreach (array_reverse($tree) as $term) {<br> if (in_array($term->tid, array_values($default_values)) || in_array($term->tid, $terms)) {<br>@@ -389,6 +389,9 @@<br> if ($parent) {<br> $terms[$parent] = $parent;<br> }<br>+ if (!$multiple) {<br>+ break;<br>+ }<br> }<br> }<br> }<br>@@ -418,10 +421,21 @@<br> $this_parents = $parents;<br> $this_parents[] = $term->tid;<br><br>+ $value = in_array($term->tid, $default_value) ? 1 : 0;<br>+ if ($value && !$multiple) {<br>+ // Find our direct parent<br>+ $newindex = $index;<br>+ while ($newindex >= 0 && $tree[$newindex]->depth >= $current_depth) {<br>+ $newindex--;<br>+ }<br>+ if ($newindex >= 0) {<br>+ $value = in_array($tree[$newindex]->tid, $terms_to_expand) ? 1 : 0;<br>+ }<br>+ }<br> $form[$term->tid]['checkbox'] = array(<br> '#type' => ($multiple) ? 'checkbox' : 'radio',<br> '#title' => $term->name,<br>- '#value' => in_array($term->tid, $default_value) ? 1 : 0,<br>+ '#value' => $value,<br> '#return_value' => $term->tid,<br> '#theme' => ($multiple) ? 'taxonomy_manager_tree_checkbox' : 'taxonomy_manager_tree_radio',<br> );</pre>
issue
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Project: project/taxonomy_manager
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