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QR-Code-generator
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Updated JavaScript demo code to show no canvas if QR Code generation failed.

This commit is contained in:
Nayuki Minase 2016-04-18 19:40:21 +00:00
parent c55751e7bd
commit 1d27211497
1 changed files with 7 additions and 5 deletions
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8
javascript/qrcodegen-demo.js
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@ -38,6 +38,11 @@ function redrawQrCode() {
return qrcodegen.QrCode.Ecc.LOW;
}
// Reset canvas in case of early termination
var canvas = document.getElementById("qrcode-canvas");
canvas.width = 0;
canvas.height = 0;
// Get form inputs and compute QR Code
var ecl = getInputErrorCorrectionLevel();
var text = document.getElementById("text-input").value;
@ -55,12 +60,9 @@ function redrawQrCode() {
return;
// Draw QR Code onto canvas
var canvas = document.getElementById("qrcode-canvas");
var width = (qr.getSize() + border * 2) * scale;
if (canvas.width != width) {
canvas.width = width;
canvas.height = width;
}
var ctx = canvas.getContext("2d");
for (var y = -border; y < qr.getSize() + border; y++) {
for (var x = -border; x < qr.getSize() + border; x++) {