无法在第二页访问 Cordova 插件答案

【问题标题】：Can't Access Cordova plugin in Second page无法在第二页访问 Cordova 插件
【发布时间】：2014-03-27 07:18:28
【问题描述】：

我想在我的适用于 ios 的 cordova 应用程序构建中包含相机插件。所以我使用了来自互联网的样本这是我的代码及其工作

<html>
  <head>
    <title>Capture Photo</title>
    <script type="text/javascript" charset="utf-8" src="cordova.js"></script>
    <script type="text/javascript" charset="UTF-8" src="cordova_plugins.js"></script>
    <script type="text/javascript" charset="utf-8">
    var pictureSource;
    var destinationType; 
    document.addEventListener("deviceready",onDeviceReady,false);
    function onDeviceReady() {
        pictureSource=navigator.camera.PictureSourceType;
        destinationType=navigator.camera.DestinationType;
    }
    function onPhotoDataSuccess(imageData) {
      var smallImage = document.getElementById('smallImage');
      smallImage.style.display = 'block';
      smallImage.src = "data:image/jpeg;base64," + imageData;
    }

    function onPhotoURISuccess(imageURI) {
      var largeImage = document.getElementById('largeImage');
      largeImage.style.display = 'block';
      largeImage.src = imageURI;
    }

    function capturePhoto() {
      navigator.camera.getPicture(onPhotoDataSuccess, onFail, { quality: 50,
        destinationType: destinationType.DATA_URL });
    }

    function capturePhotoEdit() {
      navigator.camera.getPicture(onPhotoDataSuccess, onFail, { quality: 20, allowEdit: true,
        destinationType: destinationType.DATA_URL });
    }
    function getPhoto(source) {
      navigator.camera.getPicture(onPhotoURISuccess, onFail, { quality: 50,
        destinationType: destinationType.FILE_URI,
        sourceType: source });
    }
    function onFail(message) {
      alert('Failed because: ' + message);
    }

    </script>
  </head>
  <body>
    <button onClick="capturePhoto();">Capture Photo</button> <br>
    <button onClick="capturePhotoEdit();">Capture Editable Photo</button> <br>
    <button onClick="getPhoto(pictureSource.PHOTOLIBRARY);">From Photo Library</button><br>
    <button onClick="getPhoto(pictureSource.SAVEDPHOTOALBUM);">From Photo Album</button><br>
    <img style="display:none;width:60px;height:60px;" id="smallImage" src="" />
    <img style="display:none;" id="largeImage" src="" />
  </body>
</html>

但我的应用中有很多页面。所以我创建了更多的 html 页面。并提供指向此页面的 href 链接。我从另一个页面调用了这个页面 url，但它没有成功。我已将这些 cordova.js 和脚本文件添加到我的 index.html 页面中。我仍然无法访问相机。我怎么能解决这个问题？除了起始页面，我如何访问页面中的那些插件？？？

请大家帮帮我.. :) 在此先感谢

【问题讨论】：

标签： javascript html ios cordova phonegap-plugins

【解决方案1】：

deviceready 事件仅在应用程序启动时触发一次。您可以安全地访问navigator.camera，而无需等待下一页的活动。事实上，您的代码会失败，因为 pictureSource 和 destinationType 将是未定义的。

<script type="text/javascript" charset="utf-8">
var pictureSource = pictureSource=navigator.camera.PictureSourceType;
var destinationType = navigator.camera.DestinationType; 

function onPhotoDataSuccess(imageData) {
  var smallImage = document.getElementById('smallImage');
  smallImage.style.display = 'block';
  smallImage.src = "data:image/jpeg;base64," + imageData;
}

function onPhotoURISuccess(imageURI) {
  var largeImage = document.getElementById('largeImage');
  largeImage.style.display = 'block';
  largeImage.src = imageURI;
}

function capturePhoto() {
  navigator.camera.getPicture(onPhotoDataSuccess, onFail, { quality: 50,
    destinationType: destinationType.DATA_URL });
}

function capturePhotoEdit() {
  navigator.camera.getPicture(onPhotoDataSuccess, onFail, { quality: 20, allowEdit: true,
    destinationType: destinationType.DATA_URL });
}
function getPhoto(source) {
  navigator.camera.getPicture(onPhotoURISuccess, onFail, { quality: 50,
    destinationType: destinationType.FILE_URI,
    sourceType: source });
}
function onFail(message) {
  alert('Failed because: ' + message);
}
</script>

如果您在 Android 手机上测试应用程序，ADT 捆绑包提供 logcat 用于跟踪设备上的 JavaScript 错误。

【讨论】：

我做了这些更改，但代码仍然不起作用.. :( [INFO:CONSOLE(112)] "Uncaught TypeError: Cannot read property 'DATA_URL' of undefined", source: file:/ //android_asset/www/index.html (112) 这里是新的错误。

【解决方案2】：

用这个替换你的相机cordova插件文件js

var pictureSource;
var destinationType;
document.addEventListener("deviceready", onDeviceReady, false);

function onDeviceReady() {
    pictureSource = navigator.camera.PictureSourceType;
    destinationType = navigator.camera.DestinationType;
}

function onPhotoDataSuccess(imageData) {
    var smallImage = document.getElementById('smallImage');
    smallImage.style.display = 'block';
    smallImage.src = imageData;
}

function onPhotoURISuccess(imageURI) {
    var largeImage = document.getElementById('largeImage');
    largeImage.style.display = 'block';
    largeImage.src = imageURI;
}

function capturePhoto() {
    navigator.camera.getPicture(onPhotoDataSuccess, onFail, {
        quality: 50,
        destinationType: destinationType.FILE_URI
    });
}

function capturePhotoEdit() {
    navigator.camera.getPicture(onPhotoDataSuccess, onFail, {
        quality: 20,
        allowEdit: true,
        destinationType: destinationType.FILE_URI
    });
}

function getPhoto(source) {
    navigator.camera.getPicture(onPhotoURISuccess, onFail, {
        quality: 50,
        destinationType: destinationType.FILE_URI,
        sourceType: source
    });
}

function onFail(message) {
    alert('Failed because: ' + message);
}

【讨论】：