From 6189182e51aa03015051f1abe4ba34f42572ca34 Mon Sep 17 00:00:00 2001
From: Nick Van den Bleeken <nick@bleeken.eu>
Date: Sat, 24 Apr 2021 19:03:24 +0200
Subject: [PATCH] Add support for using JsBarcode in implementations that don't
 implement measureText.

---
 src/renderers/shared.js | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/renderers/shared.js b/src/renderers/shared.js
index b7fe4002..243126e9 100644
--- a/src/renderers/shared.js
+++ b/src/renderers/shared.js
@@ -80,8 +80,14 @@ function messureText(string, options, context){
 	ctx.font = options.fontOptions + " " + options.fontSize + "px " + options.font;
 
 	// Calculate the width of the encoding
-	var size = ctx.measureText(string).width;
-
+	var measureTextResult = ctx.measureText(string);
+	if (!measureTextResult) {
+		// Some implementations don't implement measureText and return undefined.
+		// If the text cannot be measured we will return 0.
+		// This will make some barcode with big text render incorrectly
+		return 0;
+	}
+	var size = measureTextResult.width;
 	return size;
 }