Question

我已经实现了代码，以便禁用Android设备后退按钮，但它不起作用。当我运行我的应用程序并点击后退按钮时，它只是退出。我在我的index.html文件中包含了cordova.js。我究竟做错了什么？这是我的代码：

JS

document.addEventListener('deviceready', function () {  
      document.addEventListener("backbutton", onBackKeyDown, false);
          function onBackKeyDown(e) {
               e.preventDefault();
           } 

}, false);

的index.html

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
    <!--<link href="assets/ratchet/css/ratchet.css" rel="stylesheet">
    <link href="assets/css/styles.css" rel="stylesheet"> -->
    <meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
    <meta http-equiv="Pragma" content="no-cache" />
    <meta http-equiv="Expires" content="0" />
  <meta name="apple-mobile-web-app-capable" content="yes">
  <meta name="mobile-web-app-capable" content="yes">

 <link href="css/style.css" rel="stylesheet">

    <!-- <link href="assets/jqueryui/jquery-ui.css" rel="stylesheet"> -->
</head>
<body>
<div class="maincontainer">

<script id="langue-tpl" type="text/template">
    <div id="mydialog" title="Beezlink"></div>
    <div class="sk-circle" id="proc"><div class="sk-circle1 sk-child"></div><div class="sk-circle2 sk-child"></div><div class="sk-circle3 sk-child"></div><div class="sk-circle4 sk-child"></div><div class="sk-circle5 sk-child"></div><div class="sk-circle6 sk-child"></div><div class="sk-circle7 sk-child"></div><div class="sk-circle8 sk-child"></div><div class="sk-circle9 sk-child"></div><div class="sk-circle10 sk-child"></div><div class="sk-circle11 sk-child"></div><div class="sk-circle12 sk-child"></div></div>
    <div class="contentwrap home">
   <div id="bodydiv">
    <!--
    <img src="assets/logo-symbol.png" class="home-logo" />
   <div>    
      <div class="form-group">
        <select id="langtr" class="form-control">        
              <option value="val_fr">Francais</option>
              <option value="val_english">English</option>
              <option value="val_spanish">Spanish</option>
              <option value="val_german">German</option>
          </select>
          <br/><button id="gobtn">OK</button>
      </div>
   </div>
   -->
  </div> 
</div>  
</script>
</div>
<script type="text/javascript" src="cordova.js"></script>

<script src="lib/handlebars"></script>


<script type='application/javascript' src='lib/fastclick'></script>



<script src="lib/jquery"></script>

<script src="lib/jquery-ui"></script>

<script src="lib/jquery.alphanum"></script>

<script src="js/LangueView"></script>
<script src="js/app"></script>
<script src="js/disablerclick"></script>
</body>
</html>

app.js

// We use an "Immediate Function" to initialize the application to avoid leaving anything behind in the global scope
(function () {
    Handlebars.registerHelper('compare', function (lvalue, operator, rvalue, options) {

    var operators, result;

    if (arguments.length < 3) {
        //throw new Error("Handlerbars Helper 'compare' a besoin de 2 parametres");
    }

    if (options === undefined) {
        options = rvalue;
        rvalue = operator;
        operator = "===";
    }

    operators = {
        '==': function (l, r) { return l == r; },
        '===': function (l, r) { return l === r; },
        '!=': function (l, r) { return l != r; },
        '!==': function (l, r) { return l !== r; },
        '<': function (l, r) { return l < r; },
        '>': function (l, r) { return l > r; },
        '<=': function (l, r) { return l <= r; },
        '>=': function (l, r) { return l >= r; },
        'typeof': function (l, r) { return typeof l == r; }
    };

    if (!operators[operator]) {
        //throw new Error("Handlerbars Helper 'compare' ne connait pas l'operateur " + operator);
    }

    result = operators[operator](lvalue, rvalue);

    if (result) {
        return options.fn(this);
    } else {
        return options.inverse(this);
    }

});

 LangueView.prototype.template = Handlebars.compile($("#langue-tpl").html());
  $('body').html(new LangueView().render().$el);

            /* ---------------------------------- Local Variables ---------------------------------- */

      //  var pictureSource; // picture source
      //var destinationType; // sets the format of returned value
      // Wait for device API libraries to load
      //
  /*var service = new EmployeeService();
     service.initialize().done(function () {
     $('body').html(new HomeView(service).render().$el);
    });*/

    /* --------------------------------- Event Registration -------------------------------- */
    //$('.search-key').on('keyup', findByName);
    /*$('.help-btn').on('click', function() {
        alertjqry("Employee Directory v3.4");
    });*/

 /*
  window.addEventListener('orientationchange', function () {   //window.orientation=='-90' || window.orientation=='90'
    if(window.innerHeight < window.innerWidth){
    if(window.orientation=='-90' || window.orientation=='90')
       alertjqry("Attention: Si vous avez un iphone 6, veuillez retourner en mode portrait sinon certaines fonctions de l'application pourront mal fonctionner avec cette orientation de votre appareil!");
    }else{
          $("#mydialog").dialog('close');
    } 
   }, false);
 */ 


    document.addEventListener('deviceready', function () {
    FastClick.attach(document.body);
    //console.log(navigator.contacts);
    // console.log(navigator.camera);
  //console.log(FileTransfer);
  //window.open= cordova.InAppBrowser.open;

  //pictureSource = navigator.camera.PictureSourceType;
  //destinationType = navigator.camera.DestinationType;
/*
    if (navigator.notification) { // Override default HTML alert with native dialog
      window.alert = function (message) {
          navigator.notification.alert(
              message,    // message
              null,       // callback
              "Beezlink", // title
              'OK'        // buttonName
          );
      };
    }

*/ 
   document.addEventListener("backbutton", onBackKeyDown, false);

   }, false);

  function onBackKeyDown(e) {
     e.preventDefault();
   }    

   //console.log(FileTransfer);




    /* ---------------------------------- Local Functions ---------------------------------- */


}());

Answer 1

尝试添加 e.stopPropagation（）或 e.stopImmediatePropagation（） 而不是e.preventDefault（）;

    document.addEventListener("deviceready", onDeviceReady, false);
    function onDeviceReady() {
        document.addEventListener("backbutton", function (e) {
            e.preventDefault(); OR e.stopPropagation();
        }, false );
}

常见错误是在桌面和cordova上执行开发 脚本被排除。然后忘记包括cordova脚本移动版。

Answer 2

您可能需要阻止像popstate这样的其他窗口事件。试试这个：

window.addEventListener("popstate", function(e) {
   //try e.preventDefault() or e.stopImmediatePropagation()
   e.stopImmediatePropagation()
   e.preventDefault();
}, false);

Answer 3

我跳过onDeviceReady，所以我只有：

  document.addEventListener("backbutton", onBackKeyDown, false);
  function onBackKeyDown(e) {
    e.preventDefault();
  }

这对我有用

在cordova app

3 个答案: