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	xhrform.js - jscancer - Javascript crap (relatively small)
	git clone git://git.codemadness.org/jscancer
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	xhrform.js (2035B)
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	1 function xhr_form_config(el) {
	2 return {
	3 "form" : el.form,
	4 "fn" : window[el.getAttribute("data-xhr-status")],
	5 "method" : el.getAttribute("data-xhr-method") \|\| (el.for…
	6 "action" : el.getAttribute("data-xhr-action") \|\| (el.for…
	7 "encoding" : el.getAttribute("data-xhr-encoding") \|\| (el…
	8 "timeout" : el.getAttribute("data-xhr-timeout")
	9 };
	10 }
	11
	12 function xhr_form_send(c, formdata) {
	13 var x = new(XMLHttpRequest);
	14 var encoding = c.encoding \|\| "application/x-www-form-urlencoded";
	15 x.open(c.method \|\| "get", c.action \|\| "", true); // async
	16 x.setRequestHeader("Content-Type", encoding);
	17 x.setRequestHeader("X-Requested-With", "XMLHttpRequest");
	18 x.timeout = parseInt(c.timeout \|\| "10000");
	19 x.onreadystatechange = function () {
	20 if (x.readyState != 4)
	21 return;
	22 if (typeof(c.fn) == "function")
	23 c.fn(x, formdata);
	24 };
	25 var data = "";
	26 // FormData is normally sent as multipart encoded.
	27 if (encoding === "application/x-www-form-urlencoded" ) {
	28 var l = [];
	29 for (var d of formdata.entries())
	30 l.push(d[0] + "=" + encodeURIComponent(String(d[…
	31 data = l.join("&");
	32 } else {
	33 data = formdata;
	34 }
	35 x.send(data);
	36 }
	37
	38 function xhr_form_submit(el) {
	39 var d = new FormData(el.form);
	40 d.append(el.name, el.value); // add submit button itself.
	41 return xhr_form_send(xhr_form_config(el), d);
	42 }
	43
	44 /* initialize forms automatically on input submit which has a data-xhr a…
	45 document.addEventListener("click", function(e) {
	46 if (e.target === null \|\| e.target.type !== "submit" \|\|
	47 e.target.tagName !== "INPUT" \|\|
	48 !e.target.form \|\| e.target.getAttribute("data-xhr") === null)
	49 return;
	50
	51 if (e.target.form.noValidate \|\| // disabled validation on form.
	52 e.target.formNoValidate \|\| // disabled validation on element.
	53 !e.target.form.reportValidity \|\| e.target.form.reportValidit…
	54 xhr_form_submit(e.target);
	55
	56 // prevent default action.
	57 e.preventDefault();
	58 return !!e.stopPropagation();
	59 }, false);