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bug: ion-item-sliding update error #29499

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@Danak-UY

Description

@Danak-UY

Prerequisites

Ionic Framework Version

v7.x, v8.x

Current Behavior

I am using the bundled version of ionic
After I render a ion-item-sliding with ion-item-options two or more times I get an error like the following

p-b51e4004.js:4 Uncaught (in promise) Error: "undefined" is not a valid value for [side]. Use "start" or "end" instead.
    at b (p-b51e4004.js:4:3050)
    at b.updateOptions (p-c7e0b81a.entry.js:4:14724)
    at b.connectedCallback (p-c7e0b81a.entry.js:4:13108)
    at Fs (p-4af0b730.js:7:239613)
    at js (p-4af0b730.js:7:241171)
    at p-4af0b730.js:7:242350
    at Vs (p-4af0b730.js:7:242665)
    at p-4af0b730.js:7:247293
    at Object.jmp (p-4af0b730.js:8:170)
    at c.connectedCallback (p-4af0b730.js:7:247284)

This happens even if I add a valid side prop to the element
Tried the same code with v6.6.0 and it works fine

Expected Behavior

Update or add item without error

Steps to Reproduce

Test code

  • Click plus icon multiple times
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Test Ionic Item Sliding</title>

    <script
      type="module"
      src="https://cdn.jsdelivr.net/npm/@ionic/[email protected]/dist/ionic/ionic.esm.js"
    ></script>
    <script
      nomodule
      src="https://cdn.jsdelivr.net/npm/@ionic/[email protected]/dist/ionic/ionic.js"
    ></script>
    <link
      rel="stylesheet"
      href="https://cdn.jsdelivr.net/npm/@ionic/[email protected]/css/ionic.bundle.css"
    />
  </head>
  <body>
    <ion-app>
      <ion-header>
        <ion-toolbar>
          <ion-title>Test Ionic Item Sliding</ion-title>
          <ion-buttons slot="end">
            <ion-button id="add-item">
              <ion-icon name="add" slot="icon-only"></ion-icon>
            </ion-button>
          </ion-buttons>
        </ion-toolbar>
      </ion-header>

      <ion-content>
        <ion-list> </ion-list>
      </ion-content>
    </ion-app>

    <script>
      const itemList = [];
      const $list = document.querySelector("ion-list");
      document.querySelector("#add-item").addEventListener("click", writeItems);

      function generateItem() {
        const currentItem = itemList.length + 1;
        const item = `
            <ion-item-sliding id="item-${currentItem}">
                <ion-item>
                <ion-label>Sliding Item ${currentItem}</ion-label>
                </ion-item>

                <ion-item-options side="end">
                <ion-item-option color="danger" id="delete-item-${currentItem}">Delete</ion-item-option>
                </ion-item-options>
            </ion-item-sliding>
        `;

        itemList.push(item);

        return item;
      }

      function writeItems() {
        $list.innerHTML += generateItem();

        const currentItem = itemList.length;
        const deleteId = `#delete-item-${currentItem}`;
        const itemId = `#item-${currentItem}`;

        document.querySelector(deleteId).addEventListener("click", (ev) => {
          document.querySelector(itemId).remove();
        });
      }
    </script>
  </body>
</html>

Code Reproduction URL

https://stackblitz.com/edit/stackblitz-starters-mezoy6?file=index.html

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