此 ImageUpload 功能有效，但每次我上传新照片时，它都会不断添加副本。那我不是我想要的。当我上传第一张图片时，它可以正常工作。一张图片上传到我的服务器。但是当我继续选择或拍摄新照片时，它会上传同一张照片的两张副本。我上传的第三张图片变成了上传树次，接下来是四次，所以每次上传的副本都会增长。只有当我重新启动应用程序时，它才会再次从一个副本上传开始。我希望有人能看到什么是错的，或者我可以在上传过程后如何重置“selectedImage”。
//this variable will hold the image data blob from the device's gallery or camera
var selectedImage = null;
var buttonSelectImage = Titanium.UI.createButton({
width:240,
height:50,
top:242,
title:'Select image'
});
buttonSelectImage.addEventListener('click', function(e){
dialog.show();
});
var buttonUpload = Titanium.UI.createButton({
width:240,
height:50,
top:304,
title:'Send to site'
});
//our dialog with the options of where to get an image from
var dialog = Titanium.UI.createOptionDialog({
title: 'Choose source...',
options: ['Camera','Album','Cansel'],
cancel:2
});
//Dialog event listener
dialog.addEventListener('click',function(e){
Ti.API.info('You selected… ' + e.index);
if(e.index == 0){
//from the camera
Titanium.Media.showCamera({
success:function(event){
selectedImage = event.media;
if(event.mediaType == Ti.Media.MEDIA_TYPE_PHOTO){
imageThumbnail.image = selectedImage;
win.add(imageThumbnail);
}
buttonUpload.addEventListener('click', function(e){
if(selectedImage != null) {
postToSite();
}else{
alert('You must choose a image!');
}
});
win.add(buttonUpload);
buttonUpload.show();
},
cancel:function(){
//getting image from camera was cancelled
},
error:function(error){
// create alert
var a = Titanium.UI.createAlertDialog({title:'Camera'});
// set message
if (error.code == Titanium.Media.NO_CAMERA){
a.setMessage('Your cellphone lack the camera function!');
}else{
a.setMessage('Unexpected error: ' + error.code);
}
// show alert
a.show();
},
allowImageEditing:true,
saveToPhotoGallery:true
});
}
else if(e.index == 1){
//obtain an image from the gallery
Titanium.Media.openPhotoGallery({
success:function(event){
selectedImage = event.media;
// set image view
Ti.API.debug('Our type was: '+event.mediaType);
if(event.mediaType == Ti.Media.MEDIA_TYPE_PHOTO){
// set image view
imageThumbnail.image = selectedImage;
win.add(imageThumbnail);
}
buttonUpload.addEventListener('click', function(e){
if(selectedImage != null) {
postToSite();
}else{
alert('You must choose a image!');
}
});
win.add(buttonUpload);
buttonUpload.show();
},
cancel:function(){
//user cancelled the action fron within the photo gallery
}
});
}else{
//cancel was tapped user opted not to choose a photo
}
});
win.add(buttonSelectImage);
function randomString(length,current){
current = current ? current : '';
return length ? randomString( --length , "abcdefghiklmnopqrstuvwxyz".charAt( Math.floor( Math.random() * 60 ) ) + current ) : current;
}
//Post to server
function postToSite(){
//create the httpRequest
var xhr = Titanium.Network.createHTTPClient();
xhr.onerror = function(e)
{
Ti.UI.createAlertDialog({title:'Error', message:e.error}).show();
Ti.API.info('IN ERROR ' + e.error);
};
xhr.setTimeout(40000);
xhr.onsendstream = function(e){
ind.value = e.progress ;
Ti.API.info('ONSENDSTREAM - PROGRESS: ' + e.progress);
ind.show();
};
// Get the sessionID
var sessionId = Titanium.App.Properties.getString("sessionId");
//open the httpRequest
xhr.open('POST','http://example.com/index.php?include=app_support/upload.php&session_id='+sessionId);
activityIndicator.show();
buttonUpload.hide();
xhr.onload = function(){
//the image upload method has finished
var json = this.responseText;
var response = JSON.parse(json);
if (response.auth == 'false'){
alert('User validation failed');
}
else if (response.upload_status == 'success'){
ind.hide();
activityIndicator.hide();
buttonUpload.hide();
alert(response.message);
}else{
ind.hide();
activityIndicator.hide();
buttonUpload.show();
alert(response.message);
}
};
//send the data
var r = randomString(5) + '.jpg';
xhr.send({'form_data[file][value]': selectedImage, 'value': r});
}