clean up missing images in radar parsing

server/scripts/modules/navigation.js

@@ -183,6 +183,14 @@ const navigation = (() => {
 
 	// navigate to next or previous
 	const navTo = (direction) => {
+		// test for a current display
+		const current = currentDisplay();
+		if (!current) {
+			// special case for no active displays (typically on progress screen)
+			progress.hideCanvas();
+			displays[0].navNext(msg.command.firstFrame);
+			return;
+		}
 		if (direction === msg.command.nextFrame) currentDisplay().navNext();
 		if (direction === msg.command.previousFrame) currentDisplay().navPrev();
 	};
@@ -208,8 +216,6 @@ const navigation = (() => {
 	// get the current display index or value
 	const currentDisplayIndex = () => {
 		let index = displays.findIndex(display=>display.isActive());
-		// if there is no active display, default to the first one
-		if (index === -1) index = displays.length-1;
 		return index;
 	};
 	const currentDisplay = () => {
@@ -235,6 +241,11 @@ const navigation = (() => {
 			setPlaying(false);
 			navTo(msg.command.previousFrame);
 			break;
+		case 'menu':
+			setPlaying(false);
+			progress.showCanvas();
+			hideAllCanvases();
+			break;
 		default:
 			console.error(`Unknown navButton ${button}`);
 		}

server/scripts/modules/radar.js

@@ -49,15 +49,20 @@ class Radar extends WeatherDisplay {
 		}
 
 		// convert to an array of gif urls
-		const $list = $(radarHtml);
+		const parser = new DOMParser();
-		const gifs = $list.find('a[href]').map((i,elem) => elem.innerHTML).get();
+		const xmlDoc = parser.parseFromString(radarHtml, 'text/html');
+		const anchors = xmlDoc.getElementsByTagName('a');
+		const gifs = [];
+		for (let idx in anchors) {
+			gifs.push(anchors[idx].innerHTML);
+		}
 
 		// filter for selected urls
-		let filter = /^Conus_\d/;
+		let filter = /Conus_\d/;
 		if (weatherParameters.State === 'HI') filter = /hawaii_\d/;
 
 		// get the last few images
-		const urlsFull = gifs.filter(gif => gif.match(filter));
+		const urlsFull = gifs.filter(gif => gif && gif.match(filter));
 		const urls = urlsFull.slice(-this.dopplerRadarImageMax);
 
 		// calculate offsets and sizes

server/scripts/modules/weatherdisplay.js

@@ -232,7 +232,7 @@ class WeatherDisplay {
 		// if there was a command the canvas has already been drawn
 		if (navCmd) return;
 
-		// refresh the canvas (incase the screen index changed)
+		// refresh the canvas (in case the screen index changed)
 		if (navCmd) this.drawCanvas();
 	}
 	hideCanvas() {
@@ -304,6 +304,7 @@ class WeatherDisplay {
 		} else {
 			this.screenIndexChange(this.screenIndex);
 		}
+		this.showCanvas();
 	}
 
 	// navigate to previous screen
@@ -329,6 +330,7 @@ class WeatherDisplay {
 		} else {
 			this.screenIndexChange(this.screenIndex);
 		}
+		this.showCanvas();
 	}
 
 	// calculate a baseCount from the screen index for the array timings