プラグインのアウトレットで定義された要素にDOMインターフェースでアクセスできない

開発
1

I used the following plug-in outlet to make a button below the header.

<script type="text/x-handlebars" data-template-name="/connectors/below-site-header/vic-button">
    <a id="vic-button" href="http://mathbymiles.com/new-topic?title=&body=&category=uncategorized&tags=" class="btn btn-default">
        <span class="d-button-label">
            ask a question
        </span>
    </a>
</script>

It works just fine. However, now I want to access it with JavaScript to manipulate it, but when I try to get the element based on the id vic-button, the console just returns null.

So when I do

<script type="text/discourse-plugin" version="0.8">
    const button = document.getElementById('vic-button');
    console.log(button);
</script>

I get null as the output. Any ideas?

「いいね！」 1
2

It’s probably running your selector before it’s rendered the template.

You need to do this ‘in framework’.

The best approach would be to turn this into an Ember Component, then use a hook like didInsertElement() to capture the point at which it’s available to modify.

Remember this is a web app not a web page. Elements are dynamic not static. The plugin outlet is itself a Component so is not rendered immediately.

「いいね！」 3
3

Would I do something like this?

<script type="text/discourse-plugin" version="0.8">
    api.modifyClass('component:plugin-outlet', {
      didInsertElement() {
        this._super(...arguments);

        const button = document.getElementById('vic-button');
        console.log(button);
      },
    });
</script>

When I do this, there is a repeated null output to the console. I’m a complete newbie so I just tried to search around on meta for people doing similar things, so this is probably not the right track.

4

Figured it out:

api.decoratePluginOutlet(
       "below-site-header",
       (elem, args) => {
           const button = document.getElementById('vic-button');
           console.log(button);
       }
    );

The output shows what I want. And now I can manipulate the element!

「いいね！」 2