javascript - 将 div 背景设置为相机拍摄的照片

Question

我正在 Android 中使用 PhoneGap 构建一个移动应用程序，并尝试将 div 的背景设置为使用相机拍摄的照片。

我的相机工作正常(下面的代码)，但是在拍完照片后我想立即将 body div 的背景图像设置为照片，而不是只向用户显示他们的照片。

var pictureSource;   // picture source
var destinationType; // sets the format of returned value 

// Wait for PhoneGap to connect with the device
//
document.addEventListener("deviceready",onDeviceReady,false);

// PhoneGap is ready to be used!
//
function onDeviceReady() {
    pictureSource=navigator.camera.PictureSourceType;
    destinationType=navigator.camera.DestinationType;
}

// Called when a photo is successfully retrieved
//
function onPhotoDataSuccess(imageData) {
  // Uncomment to view the base64 encoded image data
  // console.log(imageData);

  // Get image handle
  //
  var smallImage = document.getElementById('smallImage');

  // Unhide image elements
  //
  smallImage.style.display = 'block';

  // Show the captured photo
  // The inline CSS rules are used to resize the image
  //
  smallImage.src = "data:image/jpeg;base64," + imageData;

  //set the background here?
  $('#wrapper').css("background-image", "url(imageData.jpg)"); 
}

// Called when a photo is successfully retrieved
//
function onPhotoURISuccess(imageURI) {
  // Uncomment to view the image file URI 
  // console.log(imageURI);

  // Get image handle
  //
  var largeImage = document.getElementById('largeImage');

  // Unhide image elements
  //
  largeImage.style.display = 'block';

  // Show the captured photo
  // The inline CSS rules are used to resize the image
  //
  largeImage.src = imageURI;
}

// A button will call this function
//
function capturePhoto() {
  // Take picture using device camera and retrieve image as base64-encoded string
  navigator.camera.getPicture(onPhotoDataSuccess, onFail, { quality: 50 });
}

// A button will call this function
//
function capturePhotoEdit() {
  // Take picture using device camera, allow edit, and retrieve image as base64-encoded string  
  navigator.camera.getPicture(onPhotoDataSuccess, onFail, { quality: 20, allowEdit: true }); 
}

// A button will call this function
//
function getPhoto(source) {
  // Retrieve image file location from specified source
    navigator.camera.getPicture(onPhotoURISuccess, onFail, { quality: 50, 
    destinationType: destinationType.FILE_URI,
    sourceType: source });
}

// Called if something bad happens.
// 
function onFail(message) {
  alert('Failed because: ' + message);
}

为了在前面的代码中设置背景，我使用了以下内容:

$('#wrapper').css("background-image", "url(imageData.jpg)")

任何帮助都会很棒。

Answer 1

你想要的是 URI 而不是 base64 数据

添加

$('#wrapper').css("background-image", "url("+imageURI+")")

在函数 onPhotoURISuccess 的底部，并在调用 capturePhoto() 时将其用作您的成功处理程序。我刚刚使用几乎完全相同的代码(来自 phonegap 的相机 API 文档的示例)为我工作