From d24fe4a368659411ce761686be7dc2a0d29bf3c5 Mon Sep 17 00:00:00 2001
From: manetta <manetta@noreply.example.org>
Date: Tue, 2 Apr 2019 14:06:23 +0200
Subject: [PATCH] adding the cnn.js

---
 08/cnn/cnn.js | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 08/cnn/cnn.js

diff --git a/08/cnn/cnn.js b/08/cnn/cnn.js
new file mode 100644
index 0000000..746599d
--- /dev/null
+++ b/08/cnn/cnn.js
@@ -0,0 +1,84 @@
+const invocation = new XMLHttpRequest();
+	const url = 'https://pad.xpub.nl/p/special_issue_8_cnn/export/txt';
+
+	function findCategories(data){
+		// Return categories that this page is part of
+		// by doing a reversed dictionary lookup
+		var current_url = window.location.href;
+		var keys = Object.keys(data)
+		var categories = [];
+		for(var i=0; i<keys.length; i++){
+			var urls = data[keys[i]];
+			for(var x=0; x<urls.length; x++){
+				if(urls[x] === current_url){
+					console.log('MATCH:', keys[i]);
+					categories.push(keys[i]);
+				}
+			}
+		}
+		return categories;
+	}
+
+	function CategoryNetworkNavigator(data){
+		// Pick two categories that this page is part of
+		// and insert links to other pages of the same category
+
+		var data = JSON.parse(data);
+
+		// Find categories that this page is part of
+		var categories = findCategories(data);
+
+		// Select a pseudo-randomised category for buttonA
+		var buttonA = categories[Math.floor(Math.random() * categories.length)];
+		document.querySelectorAll('#buttonA button')[0].textContent = buttonA;
+		
+		// Select another category for buttonB
+		var indexA = categories.indexOf(buttonA);
+		categories.splice(indexA, 1);
+		var buttonB = categories[Math.floor(Math.random() * categories.length)];
+		document.querySelectorAll('#buttonB button')[0].textContent = buttonB;
+
+		// Insert a link for each button
+		// to another page of the same category
+		var linksA = data[buttonA];
+		var linksB = data[buttonB];
+		linksA.splice(window.location.href, 1);
+		linksB.splice(window.location.href, 1);
+		document.getElementById("buttonA").href = linksA[Math.floor(Math.random() * linksA.length)];
+		document.getElementById("buttonB").href = linksB[Math.floor(Math.random() * linksB.length)];
+	}
+
+ 	function readEtherpadJSON(){
+		if (invocation){
+			invocation.open( "GET", url, true ); 
+			invocation.onreadystatechange = function() {
+				console.log('ready!');
+				if (invocation.readyState === 4 && invocation.status === 200) {
+					console.log('invocation:', invocation);
+					CategoryNetworkNavigator(invocation.responseText);
+				}
+			};
+			invocation.send();
+		}
+		return invocation;
+	}
+
+	function insertCNN(cnn_template){
+		document.body.innerHTML = cnn_template + document.body.innerHTML;
+		readEtherpadJSON();
+	}
+
+	var cnn_template = '<!-- START CNN -->\
+		<div id="cnn">\
+			<div class="button_container">\
+				<a id="buttonA" href="http://ciao.urca.tv/SITE/"><button>WHAT IS A NETWORK?</button></a>\
+			</div>\
+			<div class="button_container">\
+				<a id="buttonB" href="http://richfolks.club/toots/"><button>AUTONOMY AND ITS CONTINGENCIES</button></a>\
+			</div>\
+			<a id="sitemap" href="https://issue.xpub.nl/08/"><button>netmap</button></a>\
+		</div>\
+		<link rel="stylesheet" type="text/css" href="https://issue.xpub.nl/08/cnn/cnn.css">\
+		<!-- END CNN -->'
+
+	insertCNN(cnn_template);
\ No newline at end of file