我继续接受有关 cordova 和 javascript 的培训(我需要)。 我尝试使用相机创建一个非常小的应用程序。为此，我采用了下面提供的代码 [ http://cordova.apache.org/docs/en/2.5.0/cordova_camera_camera.md.html#Camera] 我正在尝试在 netbeans 的 cordova 项目中调整此代码。
我得到下面的代码。我提供我的 index.html 和我的 index.js。 我在模拟器中测试时遇到问题。当我点击按钮时，什么也没有发生，没有错误信息，什么也没有，显然它没有用相机拍照。似乎方法 capturePhoto 中的行有问题，因为我在 netbeans 中有警告(未声明全局变量 destinationType)。请问你能帮帮我吗 ？
index.html
<head>
<meta http-equiv="Content-Security-Policy" content="default-src 'self' data: gap: https://ssl.gstatic.com 'unsafe-eval'; style-src 'self' 'unsafe-inline'; media-src *">
<meta name="format-detection" content="telephone=no">
<meta name="msapplication-tap-highlight" content="no">
<meta name="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width">
<title>Hello World</title>
<link rel="stylesheet" type="text/css" href="css/index.css">
</head>
<body>
<div class="app">
<h1>Apache Cordova</h1>
<div id="deviceready" class="blink">
<p class="event listening">Connecting to Device</p>
<p class="event received">Device is Ready</p>
</div>
</div>
<button id="myBtn">Capture Photo</button> <br>
<img style="display:none;width:80px;height:80px;" id="smallImage" src="" />
<img style="display:none;" id="largeImage" src="" />
<script>
document.getElementById("myBtn").addEventListener("click", capturePhoto());
</script>
<script type="text/javascript" src="cordova.js"></script>
<script type="text/javascript" src="js/index.js"></script>
</body>
索引.js
var app = {
pictureSource: "",
destinationType: "",
// Application Constructor
initialize: function() {
this.bindEvents();
},
// Bind any events that are required on startup. Common events are:
// 'load', 'deviceready', 'offline', and 'online'.
bindEvents: function() {
document.addEventListener('deviceready', this.onDeviceReady, false);
},
// deviceready Event Handler
// The scope of 'this' is the event. In order to call the 'receivedEvent'
// function, we must explicitly call 'app.receivedEvent(...);'
onDeviceReady: function() {
app.receivedEvent('deviceready');
app.pictureSource = navigator.camera.PictureSourceType;
app.destinationType = navigator.camera.DestinationType;
},
// 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);
},
// Called when a photo is successfully retrieved
onPhotoDataSuccess: function(imageData) {
var smallImage = document.getElementById('smallImage');
smallImage.style.display = 'block';
smallImage.src = "data:image/jpeg;base64," + imageData;
},
// A button will call this function
capturePhoto: function() {
navigator.camera.getPicture(onPhotoDataSuccess, onFail, { quality: 100, destinationType: destinationType.DATA_URL });
},
// Called if something bad happens.
onFail: function(message) {
alert('Failed because: ' + message);
}
};
app.initialize();
再次感谢您的帮助
最佳答案
在调用 navigator.camera.getPicture 时，您需要 destinationType: Camera.DestinationType.DATA_URL 而不是 destinationType: destinationType.DATA_URL .您还应该指定 sourceType 和 mediaType，因此您可能想要执行如下操作:
function capturePhoto() {
var options = {
quality: 100,
destinationType: Camera.DestinationType.DATA_URL,
sourceType: Camera.PictureSourceType.CAMERA,
mediaType: Camera.MediaType.CAMERA,
encodingType: Camera.EncodingType.JPEG,
saveToPhotoAlbum: true
};
navigator.camera.getPicture(onPhotoDataSuccess, onFail, options);
}
关于javascript - 在 cordova 应用程序中使用相机拍摄照片，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31071503/