Air quality sensor
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>ESP node</title>
<style>
html { font-family:sans-serif }
table { border-collapse:collapse; }
td,th { padding: 4px 10px; min-width: 65px; }
td { min-width: 70px; }
th { text-align:left; }
tbody th { text-align:center; }
tbody th {border-right: 1px solid black;}
thead th { text-align:center;padding-top:0; }
td { text-align:right; }
td[c],[c] td { text-align:center; }
td[l],[l] td { text-align:left; }
td[r],[r] td { text-align:right; }
td[ed] {cursor:pointer;}
td[ed]:hover {text-decoration:underline;}
table[thl] tbody th {text-align:left;}
figure {
border-top:3px solid black;
border-bottom:3px solid black;
display: inline-block;
padding: 5px 0;
margin: 0 0 15px 15px;
}
thead tr { border-bottom: 2px solid black; }
</style>
</head>
<body>
<h1>ESP node {version}</h1>
<a href="/reboot">Restart node</a>
<script>
var kv_re = /^(-?[0-9.-]+)\s+(.+)$/;
var Qi = function (x) { return document.getElementById(x) };
var data = {};
function update(data) {
if (data) {
var rows = data.split('\x1e');
rows.forEach(function (v) {
var kv = v.split('\x1f');
var el = Qi(kv[0]);
if (!el) return;
var suf = '';
var res = kv_re.exec(el.textContent);
if (res) suf = ' ' + res[2];
el.textContent = kv[1] + suf;
data[kv[0]] = kv[1];
});
} else {
var xhr=new XMLHttpRequest();
xhr.onreadystatechange = function () {
if (xhr.readyState===4){
if (xhr.status===200) {
update(xhr.responseText);
}
setTimeout(update, 1000);
}
};
xhr.onerror = function () {
setTimeout(update, 1000);
};
xhr.open('GET', '/data');
xhr.send();
}
}
function mkXhr() {
var xhr=new XMLHttpRequest();
xhr.onreadystatechange = function () {
if (xhr.readyState===4 && xhr.status!==200) {
alert(xhr.responseText || xhr.statusText || 'Request failed');
}
};
return xhr;
}
function editOpt() {
var k = this.id;
var v = prompt(k+' =', data[k]||'');
if (v !== null) {
var xhr = mkXhr();
xhr.open('POST', '/set');
xhr.send("key="+k+'&value='+encodeURIComponent(v));
}
}
function toggleOpt() {
var xhr = mkXhr();
xhr.open('POST', '/toggle');
xhr.send("x="+this.id);
}
/*
setTimeout(update, 500);
for(var i=1;i<8;i++) {
if(i<7) Qi('i'+i+'_max').addEventListener('click', editOpt);
Qi('ch'+i+'_state').addEventListener('click', toggleOpt);
}
*/
</script>