We have a searchbar made with an amp-form and an input text. On validation, we want to redirect the page on the mobile site, but we don't find a way to templatize the url with something like this :
<form method="get" action="https://example.com/search/'+searchword+'.html'">
<input type="text" autocomplete="off" id="searchbar">
</form>
Of course, we can't change the url, to pass the param in query string.
So far we tried to use the amp-bind, but form [action] isn't a valid target.
You can't change the URL directly, but amp-form will append your input field values to the URL as query parameters. This form:
<form method="get" action="https://example.com/search/">
<input type="text" autocomplete="off" id="searchbar" name="query" value="hello">
</form>
results in the following request URL: https://example.com/search/?query=hello.
I'd also suggest filing a feature request here for enabling bindings to the form actions.