为什么我在Jquerymobile中遇到Qr代码阅读器应用程序的问题？

问题描述

我从这个网站上获取了qr代码阅读器代码https://github.com/wildabeast/BarcodeDemo\"。我正在jquerymobile中开发。我的问题是，如果我将扫描作为第一页，它完美地工作。如果我使用此页面而不是启动页面然后我面临问题，那就是当我第一次扫描图像时，它没有显示任何结果。如果第二次扫描得到结果，接下来第3次我没有得到结果，接下来第4次我得到结果，最后我得到的结果是偶数次扫描，这是我的应用问题。

I took the qr code reader code from this website "https://github.com/wildabeast/BarcodeDemo".I am developing in jquerymobile. My problem is if i place the scan as first page,it works perfectly. if i use this page other than startup page then i'm facing problem, that is when i scan the image first time ,it does not show any result. If scan 2nd time i got result, next 3rd time i am not getting result, next 4th time i am getting result, finally i got the result in even number of times scanning only, this is my application problem.

  <span class="ui-btn-inner custom_button_red" style="margin-removed10px;"><span class="ui-btn-text"  style="color:white;" id="scan">Scan & Buy</span></span>


 <script type="text/javascript" src="cordova.js"></script>
 <script type="text/javascript" src="barcodescanner.js"></script>
 <script type="text/javascript" src="childbrowser.js"></script>
 <script type="text/javascript" src="js/index.js"></script>
 <script type="text/javascript">
	app.initialize();
 </script>




here "app.initialize()" method is initiated from index.js




here i'm rendering the code in index.js :

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
var app = {

    // Application Constructor
    initialize: function() {
        this.bindEvents();
    },
    // Bind Event Listeners
    //
    // Bind any events that are required on startup. Common events are:
    // `load`, `deviceready`, `offline`, and `online`.
    bindEvents: function() {
        document.addEventListener('deviceready', this.onDeviceReady, false);
        document.getElementById('scan').addEventListener('click', this.scan, false);
        //document.getElementById('encode').addEventListener('click', this.encode, false);
console.log("hi");
   },

    // deviceready Event Handler
    //
    // The scope of `this` is the event. In order to call the `receivedEvent`
    // function, we must explicity call `app.receivedEvent(...);`
    onDeviceReady: function() {
        app.receivedEvent('deviceready');
    },

    // Update DOM on a Received Event
    receivedEvent: function(id) {
        var parentElement = document.getElementById(id);
        var listeningElement = parentElement.querySelector('.listening');
        var receivedElement = parentElement.querySelector('.received');

        listeningElement.setAttribute('style', 'display:none;');
        receivedElement.setAttribute('style', 'display:block;');

        console.log('Received Event: ' + id);
    },

    scan: function() {

        console.log('scanning');
      //alert("1st click");
        var scanner = cordova.require("cordova/plugin/BarcodeScanner");
        // scanner = cordova.require("cordova/plugin/BarcodeScanner");
        //alert("lybrary loading");
        scanner.scan( function (result) {
        alert("scan function starts from here");
            var regx = /^[A-Z0-9a-z]+$/;
                if (regx.test(result.text))
                {
        /*  alert("We got a QRcode\n" +
            "Result: " + result.text + "\n" +
            "Format: " + result.format + "\n");   */
                window.open("productinfonew.html?id="+result.text);
          // document.getElementById("scan").innerHTML = result.text;
            }
            else
            {
                alert("Scanned Cancel,there is no html page with this name");
            }


        }, function (error) {
        alert("scan function error");
            console.log("Scanning failed: ", error);
        } );
    },

   /*  encode: function() {
        var scanner = cordova.require("cordova/plugin/BarcodeScanner");

        scanner.encode(scanner.Encode.TEXT_TYPE, "http://www.nhl.com", function(success) {
            alert("encode success: " + success);
          }, function(fail) {
            alert("encoding failed: " + fail);
          }
        );

    } */

};

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