caching - When is module rendered in drupal? -


i newcomer in drupal, , want make custom module in drupal8. have developed module, there problems solve.

the module displays parameter value when page containing module shown users.

for example, connect http://localhost/drupal/?keyword=banana , module displays "banana".

but after above, when connect http://localhost/drupal/?keyword=apple again, module displays "banana" too.

in other words, module works when page containing module shown firstly , works wrong when connect secondly, thirdly , on.

i have tested , build() method in module called once. so, think module rendered once when connect page , can't rendered after first.

also, think can problem related cache, set admin/configuration/performance/cache "no-cache".

i not sure possible display "apple" after "banana" displayed module.

please me , let me know more details...

thanks.

there couple of possible solutions depending on constraints: disable cache particular page, or use routing wildcards.

you can disable cache on particular page using page cache kill switch service, trigger in controller:

\drupal::service('page_cache_kill_switch')->trigger();

this disable cache particular request, won't effect of seeing stale content.

a better solution, if possible, use routing parameters instead of parameters. allow separate urls (for example page/banana, page/apple etc.) cached , still show contents you'd them to. example, in module.routing.yml file:

mymodule.route:   path: '/path/{parameter}'   defaults:     _controller: '\drupal\mymodule\controller\mymodulecontroller::page'     _title: 'my module page'   requirements:     _permission: 'access content'

the {parameter} parameter can accessed in controller so:

public function page($parameter) {   return ['#markup' => $parameter]; }

more information: https://www.drupal.org/node/2186285


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