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Qrcode.js: Using JavaScript to generate two-dimensional code

Source: Internet
Author: User
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<!DOCTYPE HTML Public "-//W3C//DTD XHTML 1.0 transitional//en" "http://www.w3.org/TR/xhtml1/DTD/ Xhtml1-transitional.dtd "><HTMLxmlns= "http://www.w3.org/1999/xhtml"Xml:lang= "Ko"Lang= "Ko"><Head><title>Javascript QR code generation Library: QRCode</title><Metahttp-equiv= "Content-type"content= "text/html; charset=utf-8" /><Metaname= "Viewport"content= "Width=device-width,initial-scale=1,user-scalable=no" /><Scripttype= "Text/javascript"src= "Http://cdn.bootcss.com/jquery/2.1.1/jquery.min.js"></Script><Scripttype= "Text/javascript"src= "Http://static.runoob.com/assets/qrcode/qrcode.min.js"></Script></Head><Body><inputID= "text"type= "text"value= "Http://www.runoob.com"style= "width:80%" /><BR/><DivID= "QRCode"style= "width:100px; height:100px; margin-top:15px;"></Div><Scripttype= "Text/javascript">varQRCode= NewQRCode (document.getElementById ("QRCode"), {width: -, Height: -});functionMakecode () {varEltext=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==  -) {Makecode (); }    });</Script></Body></HTML>

View Online Sample: Http://www.runoob.com/try/try.php?filename=tryhtml5_QRCode

What is Qrcode.js?

Qrcode.js is a JavaScript library for generating two-dimensional code. This is done primarily by getting the tags of the DOM and then drawing from the HTML5 Canvas, without relying on any libraries.

Basic usage 
<div id = "QRCode" ></div><script type= "text /javascript ">new  Qrcode (document. Getelementbyid "QRCode"  "http://www.runoob.com" );  //set the link to generate the QR code </SCRIPT>

Or use some optional parameter settings:

VarQRCode= New QRCode("Test", { Text:  "http://www.runoob.com" , Width: 128 , Height: 128 , Colordark :  "#000000" , Colorlight :  "#ffffff ", Correctlevel :  Qrcode. Correctlevel. H

We can also use the following methods:

QRCode.  Clear();  Clear the Code qrcode.  Makecode("http://www.w3cschool.cc");  Generate another two-dimensional code
Browser support

Browsers that support this library are: ie6~10, Chrome, Firefox, Safari, Opera, Mobile Safari, Android, Windows mobile, etc.

Instance Code HTML code 
<inputid="text"type="text"value="http://www.runoob.com"/> <br/><divid="QRCode"></div>
CSS Code 
#qrcode {width:160px; height:160px; margin-top:15px;}
JavaScript Code 
VarQRCode= New QRCode("QRCode");functionMakecode() { VarEltext=Document.getElementById("Text"); If (!Eltext.Value) {Alert("Input a text");Eltext.Focus(); Return; }QRCode.Makecode(Eltext.Value);}Makecode();$("#text").On("Blur", function () { Makecode (); on (, function  (e { if  (e. KeyCode == 13)  { Makecode (); }});

Qrcode.js: Using JavaScript to generate two-dimensional code

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