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Add option to provide log location via ?url #16

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5 changes: 3 additions & 2 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -11,8 +11,9 @@ No server side code is required - it's all just static
files - and all modern web servers support Range (tested lighttpd, cherokee,
apache). Tested (briefly) in IE, FF, Chrome.

Usage: symlink the log to /log, or alter the url in logtail.js. Other settings
available in logtail.js including poll frequency. Then browse to index.html
Usage: symlink the log to /log, provide ?url=http://my.custom.path/log, or alter
the url in logtail.js. Other settings available in logtail.js including poll
frequency. Then browse to index.html

License is GNU GPL 3; see http://www.gnu.org/licenses/

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4 changes: 2 additions & 2 deletions logtail.html
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Expand Up @@ -10,8 +10,8 @@
<body>
<div id="header">
js-logtail.
<a href="./">Reversed</a> or
<a href="./?noreverse">chronological</a> view.
<a href="#" id="reversedOrder">Reversed</a> or
<a href="#" id="chronologicalOrder"">chronological</a> view.
<a id="pause" href='#'>Pause</a>.
</div>
<pre id="data">Loading...</pre>
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35 changes: 29 additions & 6 deletions logtail.js
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Expand Up @@ -5,9 +5,16 @@

var dataelem = "#data";
var pausetoggle = "#pause";
var reversedLink = "#reversedOrder";
var chronologicalLink = "#chronologicalOrder";
var scrollelems = ["html", "body"];

var url = "log";
var urlString = window.location.href;
var urlObject = new URL(urlString);
var urlParam = urlObject.searchParams.get("url");
var orderParam = urlObject.searchParams.get("order");
var order = orderParam ?? "reversed"
var url = urlParam ?? "log"
var fix_rn = true;
var load = 30 * 1024; /* 30KB */
var poll = 1000; /* 1s */
Expand Down Expand Up @@ -146,7 +153,7 @@ function show_log() {
if (reverse) {
var t_a = t.split(/\n/g);
t_a.reverse();
if (t_a[0] == "")
if (t_a[0] == "")
t_a.shift();
t = t_a.join("\n");
}
Expand All @@ -163,21 +170,37 @@ function error(what) {
kill = true;

$(dataelem).text("An error occured :-(.\r\n" +
"Reloading may help; no promises.\r\n" +
"Reloading may help; no promises.\r\n" +
what);
scroll(0);

return false;
}

function changeOrder(how) {
var searchParams = new URLSearchParams(window.location.search)
searchParams.set("order", how)
window.location.search = searchParams.toString()
const originalURL = new URL("http://my.app/index.html?order=reverse");
const updatedURL = addParameterToURL(originalURL, "newParam", "someValue");
}

$(document).ready(function () {
window.onerror = error;

/* If URL is /logtail/?noreverse display in chronological order */
var hash = location.search.replace(/^\?/, "");
if (hash == "noreverse")
/* If URL is /logtail/?order=chronological we display in chronological order */
if (order == "chronological") {
reverse = false;
} else {
reverse = true;
}

$(reversedLink).click(function (e) {
changeOrder("reversed");
});
$(chronologicalLink).click(function (e) {
changeOrder("chronological");
});
/* Add pause toggle */
$(pausetoggle).click(function (e) {
pause = !pause;
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