# JavaScript Hook for Composer

**URL:** <https://meta.discourse.org/t/javascript-hook-for-composer/137967>\
**Category:** Development\
**Created:** [January 7, 2020, 1:31pm UTC](https://meta.discourse.org/t/javascript-hook-for-composer/137967 "2020-01-07T13:31:33Z")\
**Posts on this page:** 1\
**Showing post:** 2

<div class="post-metadata">

**Author:** ![merefield](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/merefield/32/176214_2.png) [@merefield](https://meta.discourse.org/u/merefield)\
**Post date:** [January 7, 2020, 2:20pm UTC](https://meta.discourse.org/t/javascript-hook-for-composer/137967/2 "2020-01-07T14:20:56Z")

</div>

I suspect you want to follow an existing example.

The place to look, I suspect, is [discourse/app/assets/javascripts/discourse/components/d-editor.js.es6 at f62b8990acb9ce4af8bfc67fc80dc0847177e458 · discourse/discourse · GitHub](https://github.com/discourse/discourse/blob/f62b8990acb9ce4af8bfc67fc80dc0847177e458/app/assets/javascripts/discourse/components/d-editor.js.es6)

Specifically:

```plaintext
  didInsertElement() {
    this._super(...arguments);

    const $editorInput = $(this.element.querySelector(".d-editor-input"));
    this._applyEmojiAutocomplete($editorInput);
    this._applyCategoryHashtagAutocomplete($editorInput);

```

And maybe take a look at:

```plaintext
  _applyCategoryHashtagAutocomplete() {
    const siteSettings = this.siteSettings;

    $(this.element.querySelector(".d-editor-input")).autocomplete({
      template: findRawTemplate("category-tag-autocomplete"),
      key: "#",
      afterComplete: () => this._focusTextArea(),
      transformComplete: obj => {
        return obj.text;
      },
      dataSource: term => {
        if (term.match(/\s/)) {
          return null;
        }
        return searchCategoryTag(term, siteSettings);
      },
      triggerRule: (textarea, opts) => {
        return categoryHashtagTriggerRule(textarea, opts);
      }
    });
  },

```

NB I’ve not exploited this myself, but that’s my guess.

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