Hi @arpost ,
late answer, i know :-).
The standard header template (in my installation) renders the menu sth like this:
...
<nav aria-label="{{ resx.Main_Navigation | default: "Main Navigation" }}" class="navbar-right menu-bar {% if primary_nav.editable %}xrm-entity xrm-editable-adx_weblinkset{% endif %}" data-weblinks-maxdepth="2">
<ul class="nav navbar-nav weblinks">
{% for link in primary_nav.weblinks %}
{% unless forloop.first %}
<li class="divider-vertical" aria-hidden="true"></li>
{% endunless %}
{% if link.display_page_child_links %}
{% if link.url != null %}
{% assign sublinks = sitemap[link.url].children %}
{% endif %}
{% else %}
{% assign sublinks = link.weblinks %}
{% endif %}
<li class="weblink {% if sublinks.size > 0 %} dropdown{% endif %}">
<a aria-label="{{ link.name | escape }}" aria-roledescription = "link" {% if sublinks.size > 0 -%} href="#" class="dropdown-toggle" data-toggle="dropdown" {%- else -%} href="{{ link.url | escape }}" {%- endif -%} {%- if link.Open_In_New_Window %} target="_blank" {% endif -%} {%- if link.nofollow %} rel="nofollow" {% endif -%} {%- if link.tooltip %} title="{{ link.tooltip | escape }}" {% endif %}>
{%- if link.image -%}
{%- if link.image.url -%}
{%- if link.image.url.first == '.' -%}
<span class="{{ link.image.url | split:'.' | join }}" aria-hidden="true"></span>
{%- endif -%}
{%- else -%}
<img src="{{ link.image.url | escape }}" alt="{{ link.image.alternate_text | default:link.tooltip | escape }}" {% if link.image.width %}width="{{ link.image.width | escape }}" {% endif %} {% if link.image.height %}height="{{ link.image.height | escape }}" {% endif %} />
{%- endif -%}
{%- endif -%}
{%- unless link.display_image_only -%}
{{ link.name | escape }}
{%- endunless -%}
{%- if sublinks.size > 0 -%}
<span class="caret"></span>
{%- endif -%}
</a>
{% if sublinks.size > 0 %}
<ul class="dropdown-menu" aria-roledescription = "link">
{% if link.name %}
<li>
...
so, in principle its an unnumbered list of items. You could just copy this standard and add another li below (or above, depending where you want it) of equal items with your informations.
The informations could be read by a fetchxml (do not forget to give permissions to the data to be read)
When the modifications are done, just use your template as the header template in your website and you should be done.
!Watch out! The header is subject of heavy caching. So, when your data changes, it might take a while in order to see the changes. So, when the data in the header is for example user or language dependent, you should consider switchig off the header cache (!of course performance loss) or try to apply the principles advised here: https://learn.microsoft.com/en-us/power-pages/configure/enable-header-footer-output-caching (never tried it by my own...). But i do not know your concrete requirement 🙂
Have fun,
Christian
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