Yes.

document.forms[0].submit()

submits the 1st form on the page. And it is the typical way to submit a form in a "non-ajax" way. But the term "non ajax" is misleading in your question, hence the "POST"-verb is a simple http-verb. And there is no difference in using it "ajax"-way or a "non-ajax" way. The artificial difference one could make is: "application/x-www.formurlencoded" is the preferred format of the browser or "application/json" as you are doing it with "ajax".

P.S.: It is hard to answer your question. Of course you could avoid the dynamic creation of a form-element; but you have to use a form element anyways to do a non-ajaxy submit anyways.

Yes.

document.forms[0].submit()

submits the 1st form on the page. And it is the typical way to submit a form in a "non-ajax" way. But the term "non ajax" is misleading in your question, hence the "POST"-verb is a simple http-verb. And there is no difference in using it "ajax"-way or a "non-ajax" way. The artificial difference one could make is: "application/x-www.formurlencoded" is the preferred format of the browser or "application/json" as you are doing it with "ajax".

P.S.: It is hard to answer your question. Of course you could avoid the dynamic creation of a form-element; but you have to use a form element anyways to do a non-ajaxy submit.

yes.

document.forms[0].submit()

submits the 1st form on the page.

Yes.

document.forms[0].submit()

submits the 1st form on the page. And it is the typical way to submit a form in a "non-ajax" way. But the term "non ajax" is misleading in your question, hence the "POST"-verb is a simple http-verb. And there is no difference in using it "ajax"-way or a "non-ajax" way. The artificial difference one could make is: "application/x-www.formurlencoded" is the preferred format of the browser or "application/json" as you are doing it with "ajax".

P.S.: It is hard to answer your question. Of course you could avoid the dynamic creation of a form-element; but you have to use a form element anyways to do a non-ajaxy submit anyways.