How do I close other opened expandable items when opening a new one?

[npad69]

Is there a callback functionality for expandable items?
The reason why I’m asking is that I want to close other ‘opened’ item when opening a new one.

[emccorson]

There’s no callback functionality for expandable list items, but one way you could get this to work is to override the showExpansion function. Here is an example:

https://codepen.io/emccorson/pen/MWwjdmE

HTML

<ons-page>
  <ons-list>
    <ons-list-item expandable>
      One
      <div class="expandable-content">Expandable content</div>
    </ons-list-item>
    
    <ons-list-item expandable>
      Two
      <div class="expandable-content">Expandable content</div>
    </ons-list-item>
    
    <ons-list-item expandable>
      Three
      <div class="expandable-content">Expandable content</div>
    </ons-list-item>
  </ons-list>
</ons-page>

JS

ons.ready(() => {
  document.querySelectorAll('ons-list-item').forEach(listItem => {
    const showExpansion = listItem.showExpansion.bind(listItem);
    
    listItem.showExpansion = () => {
      document.querySelectorAll('ons-list-item.expanded').forEach(expandedListItem => {
        if (expandedListItem !== listItem) {
          expandedListItem.hideExpansion();
        }
      });
      showExpansion();
    }
  });
});

[npad69]

@emccorson

Thank you very much.
When I tried it for the first time I found out that it does not seem to work on dynamically generated lists. So what I did was to remove the ons-ready and converted it to a function to be invoked each time a new content is generated. Now its working!