What you're trying to do is to concatenate the contents of a field with a
string. There are a couple different approaches, often using helper macros.
These days, I like to use the {{{ }}} wikitext and a filter that uses
"addprefix" or "addsuffix". Like:
<a
href={{{[[https://tools.usps.com/go/TrackConfirmAction_input?qtc_tLabels1=]addsuffix{!!tracking_number}]}}}>USPS
Tracking</a>
On Monday, June 29, 2020 at 5:50:39 AM UTC-7, David wrote:
>
> I have this code that tries to put a field value into a link, which seems
> logical, but doesn't work...
>
> <a href="
> https://tools.usps.com/go/TrackConfirmAction_input?qtc_tLabels1={{!!tracking_number}}
> ">USPS Tracking</a>
>
> I also tried the transclude code...
>
> <a
> href="https://tools.usps.com/go/TrackConfirmAction_input?qtc_tLabels1=<$transclude
>
> field="tracking_number" />">USPS Tracking</a>
>
> I had originally tried this code, but it seems that external links have to
> be put into the html anchor tag.
>
> [[USPS Tracking|https://
> tools.usps.com/go/TrackConfirmAction_input?qtc_tLabels1=<$transclude
> tiddler=<<item>> field="tracking_number" />]]
>
> Thank you all!
>
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