I am calling external API in form build function. While submitting form gets rebuild and call external API again.
How can I avoid repetitive API calls in the form's build function? I used form_state->set() but it's doesn't seem to be working.
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You should paste your code to check how you are using set(). The idea is correct: save API response to form, and don't request it again in build function if info is already in form.– sanzanteCommented Mar 24, 2019 at 20:37
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1 Answer
You can test whether the form is currently rebuilding using the FormStateInterface::isRebuilding method:
if (!$form_state->isRebuilding()) {
// Contact the API
}
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It always works fine for me, you'll probably need to be more specific about what "not working" means for you– Clive ♦Commented Mar 12, 2019 at 11:51
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1@Clive, this works when you rebuild the form after submitting, but not when the form gets rebuilt while submitting. In this case you could check for user input
if (empty($form_state->getUserInput())) {}– 4uk4Commented Mar 12, 2019 at 12:45 -
@4k4 Those sound like the same thing, what's the difference? Is it just calling it in
buildFormrather thansubmitForm?– Clive ♦Commented Mar 12, 2019 at 13:00 -
@Clive, a form can be built three times during one cycle, the initial form build, then before the submit handlers are called and finally after the form is submitted and a rebuild is requested. Only the last includes submitted form values and indicates $form_state->isRebuilding() correctly.– 4uk4Commented Mar 12, 2019 at 13:27