How to check if a Blogger Post has specific Label when the Label is HIDDEN?

问题

All my Blogger posts have Labels, but I choose not to show them on my Blogger Site. On my Blogger Dashboard -> Posts, I still can see all my labels for each post and filter them by label, which is what I want. But when I try to check if the current post has a specific label (which it does have), the following code doesn't work (right before </body>):

<b:section id="testSection" name="Test Section">

        <b:if cond='data:posts any (p => p.labels any (l => l.name == "Label1"))'>
          <script type="text/javascript">
              console.log("Label1");
          </script>
          <link href='post-style-for-label1.css' rel='stylesheet' type='text/css'/>
        </b:if>

    </b:section>

I read the answer here, saying that we can't check data:post.labels outside Blog widget, but when I placed it inside a widget, it says widget cannot contain <b:if> -- this is why I placed it under <b:section>. But at the end, I still can't make my code to detect Label1. I tried the following code but not working too:

<b:if cond='data:post.labels any (label => label.name == "Label1")'>
    <script type="text/javascript">
        console.log("Label1");
    </script>
    <link href='post-style-for-label1.css' rel='stylesheet' type='text/css'/>
</b:if>

If I can remember correctly, I have removed the code that displays the labels, but is it necessary to display the labels on the site in order for the code to work? I doubt that because Blogger does have all my labels for every post. How can I make my code to work? Thanks in advance.

回答1:

Blogger theme provides several types of widgets like Header, Blog, profile...(26 type) and each type has its data tags. In your example, data:post.labels belongs to the widget type Blog so, you cannot use it outside widget tags.

Also, a widget can only contain b:includeable tags (similar to functions in Javascript)

If your theme already has a blog widget, place your code in the tag b:includable with id='main' otherwise, create one like the following:

<b:widget id='Blog1' type='Blog'>

    <b:includable id='main'>

      <b:loop values='data:posts' var='post'>

        <b:if cond='data:post.labels any (label => label.name == "Label1")'>
          <script type="text/javascript">
             console.log("Label1");
          </script>
        </b:if>

      </b:loop>

    </b:includable>

</b:widget>

来源：https://stackoverflow.com/questions/60607197/how-to-check-if-a-blogger-post-has-specific-label-when-the-label-is-hidden

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