[SOLVED] Query page category - how does it work?

TYPO3 Questions
1

I have assigned a category to a page and would now like to use it in my template. Unfortunately, I can’t find the category in the variables.
Could someone help me with this?
I would like the page header to change slightly depending on the category, e.g. different logos.

2

Hi @bernds!

In TYPO3 v13, the new record transformation data processor makes accessing a page’s categories pretty simple.

With this TypoScript, I’m fetching the current page record as a Record object and assigning it to the fluid variable pageData:

page = PAGE
page {
    10 = FLUIDTEMPLATE
    10 {
        dataProcessing {
            100 = record-transformation
            100 {
                as = pageData
            }
        }
    }
}

I can access the categories in TypoScript and for example iterate through them:

<ul>
    <f:for each="{pageData.categories}" as="category">
        <li>{category.uid}: {category.title}</li>
    </f:for>
</ul>

Since it’s possible to assign multiple categories, you have to do some kind of array-aware processing. This example assigns the first item in the categories array to the fluid variable firstCategory using fluid’s f:first ViewHelper. The variable is used to output a CSS class name and title:

<f:variable name="firstCategory">{f:first(value:pageData.categories)}</f:variable>
<div class="category-{firstCategory.uid}">{firstCategory.title}</div>

If the first selected category has UID 1 and title “Example”, the rendered HTML should be this:

<div class="category-1">Examples</div>

I hope that helps. Please let me know if you have any further questions.

3

Thanks a lot Mathias,
that was really a perfect help. Sorry, I didn’t reply immediately because that issue was not urgent I run from problem to problem with typo3. So I have to work with priorities and it is only a hobby for me, not business. So I’m always very happy, when I get some help from the experts. And yours was probably the best I ever got, so detailed and comprehensive.
I will implement it soon.
Kind regards

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