A CodePen by Sangmin, Shim. Cross-browser QRCode - QRCode.js is javascript library for making QRCode. QRCode.js supports Cross-browser with HTML5 Canvas and table tag in DOM. QRCode.js has no dependencies. Check it out http://davidshimjs.github.com/qrcodejs/

index.html

<input id="text" type="text" value="http://jindo.dev.naver.com/collie" style="width:80%" /><br />
<div id="qrcode"></div>

script.js

var qrcode = new QRCode("qrcode");

function makeCode () {		
	var elText = document.getElementById("text");
	
	if (!elText.value) {
		alert("Input a text");
		elText.focus();
		return;
	}
	
	qrcode.makeCode(elText.value);
}

makeCode();

$("#text").
	on("blur", function () {
		makeCode();
	}).
	on("keydown", function (e) {
		if (e.keyCode == 13) {
			makeCode();
		}
	});

style.css

#qrcode {
}  width:160px;
  height:160px;
  margin-top:15px;