hw2 Meh

hw2/js/script.js

@@ -0,0 +1,26 @@
+/**
+* Requests the file and executes a callback with the parsed result once
+* it is available
+* @param {path} file path
+* @param {callback} callback to execute once the result is available
+*/
+function fetchJSONFile(path, callback) {
+	var httpRequest = new XMLHttpRequest();
+	httpRequest.onreadystatechange = function() {
+		if (httpRequest.readyState === 4) {
+			if (httpRequest.status === 200) {
+				let data = JSON.parse(httpRequest.responseText);
+				if (callback) callback(data);
+			}
+		}
+	};
+	httpRequest.open('GET', path);
+	httpRequest.send();
+}
+
+//call fetchJSONFile then build and render a tree
+fetchJSONFile('data/Tree.json', function(data) {
+	let tree = new Tree(data);
+	tree.buildTree();
+	tree.renderTree();
+});