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Qrcodejs generate two-dimensional code

Source: Internet
Author: User
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Qrcode.js

Qrcode.js is dependent on JS to generate two-dimensional code. Mainly by obtaining the tag of the DOM, and then drawn by Html5canvas, not dependent on JQ

Get Qrcode.js
    • Github-page:qrcode.js
      • There are tar.gz packages and zip packages.
    • Github-repository
Introduction and Usage Introduction
    • As long as it is introduced in, JQ is not dependent and can be replaced by other versions of JQ (other content useful to JQ, such as selector acquisition)
<script type="text/javascript" src="qrcode.js"></script>
Basic usage

Get the block, call the default method directly (enter the generated string to generate the QR code)

<div id="qrcode"></div><script type="text/javascript">    new QRCode(document.getElementById("qrcode"), "https//blog.csdn.net/crper");</script>
Advanced usage

QRCode supports the following parameters:

    • Width (wide)
    • Height (altitude)
    • Colordark (background color)
    • Colorlight (front view)
    • Correctlevel (fault tolerance level, support L,m,h) Low/middle/high
varnew QRCode("test", {    "https//blog.csdn.net/crper",    400,    400,    "#000000",       "#ffffff",    // 清除二维码qrcode.makeCode("http://naver.com"// 生成另外一个二维码
Online generation function

This function is to get the ID of text, to determine whether the content is empty, the popup window is empty, and not empty to generate a two-dimensional code

function makeCode () {          var elText = document.getElementById("text");    if (!elText.value) {        alert("请输入您要生成的二维码内容!");        elText.focus();        return;    }    qrcode.makeCode(elText.value);}makeCode();

Trigger by calling Blur and KeyDown, generate a QR code when you click out of focus, or enter content and press ENTER 

$("#text").    on("blur"function () {        makeCode();    }).    on("keydown"function (e) {        if13) {            makeCode();        }    });
Practical Small Example
<! DOCTYPE html><html>  <head>    <title>Demo</title>    <meta http-equiv="Content-type" Content="Text/html;charset=utf-8" >    <meta name="viewport" content="Width=device-width, Initial-scale=1,user-scalable=no " />    <!--referencing local script files --    <script type="text/javascript" src="Jquery.min.js"></script>    <script type="text/javascript" src="Qrcode.js"> </script>    <style>      #qrcode {  height: + px;         width: px;       background: #eee; }      input {  height: px;         line-height: px;       width: px; }    </style>  </head>  <body>    <input id="text" type="text" value="This is a test text, After clearing, enter the content you want to generate " />    <div id="QRCode"></div>    <!--script is to be put in the back .......-->    <script type="Text/javascript">      varQRCode =NewQRCode (document.getElementById ("QRCode"), {width: -, Height: -, Colordark:"#000000", Colorlight:"#03f594", CORRECTLEVEL:QRCODE.CORRECTLEVEL.L}); function makecode() {        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>
Browser adaptation to support the following
PC Mobile
Ie6~10 Mobile Safari
Chrome Android
Firefox Windows Mobile
Safari
Opera
Follow the agreement

MIT License

Qrcodejs generate two-dimensional code

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Related Keywords:
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