<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Website change monitor</title>
<script>
"use strict";
var urls=[];
function pad(s,n,c){
s=s+"";
if(!c)c="0";
var fill=c,filllen=n-s.length;
if(filllen<=0)return s;
while(fill.length<filllen)fill+=c;
return fill+s;
}
function dateformat(date){
return date.getFullYear()+"/"+pad(date.getMonth(),2)+"/"+pad(date.getDate(),2)+" "+
pad(date.getHours(),2)+":"+pad(date.getMinutes(),2)+":"+pad(date.getSeconds(),2);
}
function fetch(method,url,data/*?*/,cb){
if(!cb){
cb=data;
data=undefined;
if(!cb)throw new Error("No callback passed to fetch");
}
var xhr=new XMLHttpRequest();
xhr.onreadystatechange=function(ev){
if(xhr.readyState<4)return;
cb(xhr.status,xhr.responseText);
};
xhr.open(method,url);
xhr.send(data);
}
function focusData(data){
document.getElementById("timelinecontainer").classList.add("visible");
var header=document.getElementById("timelineheader");
var tbody=document.getElementById("timelinetbody");
if(!header.firstChild)header.appendChild(document.createTextNode(data.url));
else header.firstChild.nodeValue=data.url;
var l=tbody.children,i;
for(i=l.length-1;i>=0;i--)tbody.removeChild(l[i]);
var tr,td,s;
for(i=data.timeline.length-1;i>=0;i--){
tr=document.createElement("tr");
if(i<data.timeline.length-1&&data.timeline[i][1]==data.timeline[i+1][1]){
tr.classList.add("repeated");
}
td=document.createElement("td");
td.appendChild(document.createTextNode(dateformat(new Date(data.timeline[i][0]))));
tr.appendChild(td);
td=document.createElement("td");
s=data.timeline[i][1];
if(s==null)s="(error while retrieving page)";
td.appendChild(document.createTextNode(s));
tr.appendChild(td);
tbody.appendChild(tr);
}
}
function makeURLtr(url){
var tr=document.createElement("tr");
var td=document.createElement("td");
td.appendChild(document.createTextNode(url));
var e=document.createElement("input");
e.type="button";
e.classList.add("rowdeletebutton");
e.value="X";
e.setAttribute("title","Delete URL");
e.addEventListener("click",function(ev){
ev.stopPropagation();
fetch("DELETE","/changes/url",url,function(status,body){
if(document.getElementById("timelineheader").firstChild.nodeValue==url){
document.getElementById("timelinecontainer").classList.remove("visible");
}
if(status!=200){
alert("Error deleting url: ("+status+") "+body);
return;
}
tr.parentNode.removeChild(tr);
updateURLs();
});
});
td.appendChild(e);
tr.addEventListener("click",function(ev){
fetch("GET","/changes/url?url="+encodeURIComponent(url),function(status,body){
if(status!=200){
alert("Error getting data: ("+status+") "+body);
return;
}
var data;
try {
data=JSON.parse(body);
} catch(e){
alert("Server sent invalid data!");
console.log("Invalid data:",data);
return;
}
focusData(data);
});
});
tr.appendChild(td);
return tr;
}
function updateURLs(){
fetch("GET","/changes/urls",function(status,body){
urls=JSON.parse(body);
if(!urls){
urls=[];
alert("Error retrieving URLs!");
return;
}
var tbody=document.getElementById("urlstable").firstElementChild;
var l=tbody.children,i,tr,td;
for(i=l.length-1;i>=0;i--)tbody.removeChild(l[i]);
for(i=0;i<urls.length;i++){
tbody.appendChild(makeURLtr(urls[i]));
}
});
}
function addURLbutton(){
var e=document.getElementById("urladdinput");
var url=e.value;
fetch("POST","/changes/url",url,function(status,body){
if(status==200){
e.value="";
} else {
alert("URL submission error: ("+status+") "+body);
}
updateURLs();
});
}
function addURLkeypress(ev){
if(ev.keyCode==10||ev.keyCode==13)addURLbutton();
}
function sendRefresh(){
fetch("POST","/changes/refresh",function(status,body){});
}
window.addEventListener("load",function(){
updateURLs();
//setInterval(updateURLs,10*1000);
});
</script>
<style>
body{
font-family:Georgia,Times,serif;
font-size:14px;
}
h1{
/*font-size:28px;*/
/*margin:19px 0 19px 0;*/
}
#urlscontainer{
width:500px;
}
#urlstablecontainer{
height:130px;
border:1px #888 solid;
overflow-y:scroll;
}
#urlstable{
width:100%;
border-collapse:collapse;
}
#urlstable tbody, #urlstable tr, #urlstable td{
width:100%;
}
#urlstable tr{
cursor:pointer;
}
#urlstable tr:nth-child(2n){
background-color:#eee;
}
#urlstable tr:hover{
background-color:#ddd;
}
#urlstable td{
height:100%;
vertical-align:middle;
}
#urladdinput{
width:300px;
}
.rowdeletebutton{
color:red;
font-family:Monospace;
font-weight:bold;
float:right;
cursor:pointer;
padding:0 3px 0 3px;
background-color:rgba(255,0,0,0.1);
border-radius:2px;
border-width:0;
}
#timelinetbl{
border-collapse:collapse;
}
#timelinetbl td, #timelinetbl th{
border:1px #888 solid;
}
tr.repeated{
color:#aaa;
font-size:10px;
}
#timelinecontainer{
display:none;
}
#timelinecontainer.visible{
display:block;
}
</style>
</head>
<body>
<h1>Website change monitor</h1>
<b>URLs:</b>
<input type="button" onclick="sendRefresh();" value="Redownload sites">
<br>
<div>
<div id="urlscontainer">
<div id="urlstablecontainer">
<table id="urlstable"><tbody></tbody></table>
</div>
<input type="text" id="urladdinput" onkeypress="addURLkeypress(event);">
<input type="button" onclick="addURLbutton();" value="Add URL" title="Add URL to watch list">
</div>
</div>
<div id="timelinecontainer">
<h2 id="timelineheader"></h2>
<table id="timelinetbl">
<thead><tr><th>Date</th><th>Hash</th></tr></thead>
<tbody id="timelinetbody"></tbody>
</table>
</div>
</body>
</html>