in my template, I must generate a link of type
<a href="http://myhost/myapp/#/products/12345/details">. . .</a>
'12345' is a variable part.
The link is a "deep link" to details of the product with the ID=12345. The '#' in the URL must be there because the web framework that displays the details wants it so (I think it's a single page web app).
If I have this in the template:
<a th:href="@{http://myhost/myapp/#/products/{productId}/details(productId=${product.id})}">. . .</a>
then the generated link looks like
.../myapp?productId=12345#/products/{productId}/details
i.e. the part beginning with '#' is fist cut off and then appended verbatim; the parameter is appended to the URL as a query string (with '?').
If I have this in the template (i.e. I make the hash symbol part of the variable so that this part of th URL is not cut off):
<a th:with="productLink=${'#/products/' + product.id + '/details'}"
th:href="@{http://myhost/myapp/{productLink}(productLink=${productLink})}">. . .</a>
then I get almost what I want, but the '#' in the URL is encoded as '%23':
<a href="http://myhost/myapp/%23/products/12345/details">. . .</a>
How can I generate the URL as it should be, i.e. with the hash sign and the product id at correct place -- see the start of the question.
The application is a SpringBoot based one, if that matters.
If you don't want Thymeleaf to mess with your URL, I would suggest using the regular string functions. You could use literal substitution for example:
<a th:href="|http://myhost/myapp/#/products/${product.id}/details|">. . .</a>
(Here is why Thymeleaf is messing with your #. It's trying to keep the # at the end of the url. I don't believe there is any way to change how this is working.)