我目前正尝试使用来自我的网络服务器(nodejs http-server)的图像填充ng-flow,我找到了这个帖子:
Populating image files with ng-flow.js from json
正如您在Aidas的回答中所看到的,他说您需要将数据添加到blob然后使用addFile(blob)
但是...当我使用$ resource来获取一个网址时:
http://localhost:8080/3c6397ff-cbb4-4a1c-98b3-5304e02c1bd4.jpg
然后从$ resource获取值,并将其添加到blob中,图像丢失 - 在ng-flow中,它表示blob是15kb - 而实际图像不是700kb。
我已经知道图片可能是base64格式的,但我的谷歌开发控制台说:
content-length:780831
content-type:image/jpeg; charset=utf-8
如果我查看google dev控制台中的响应数据,那里会出现很多问号(我猜不会显示该字符)。
如何正确格式化响应,以便使用addFile(blob)函数将其添加到ng-flow?
答案 0 :(得分:3)
我在Populating image files with ng-flow.js from json
中做了一些结合cvjensen解决方案和penner的方法控制器:
首先我从db读取图像并将它们存储在$ scope.project.images:
中$scope.project.images : [
{
"image_type" : "image/jpeg",
"src" : "/images/uploaded/flow-122256-fontiosojpg.1",
"alt" : "fontioso.jpg",
"_id" : ObjectId("5608ef37f7672d8b1fcab111")
}
]
然后:
Flow.prototype.addExistingFile = function (file, event) {
var f = new Flow.FlowFile(this, file);
this.files.push(f);
};
angular.forEach($scope.project.images, function(value, key) {
getBase64Images.get(value.src) //src contains the full path to img
.success(function(data) {
var blob = new Blob([data.data], {type: value.image_type});
blob.name = value.alt;
blob.image_url = value.src;
blob.alt_text = value.alt;
$scope.uploader.flow.addExistingFile(blob);
})
.error(function(error){
console.log(error);
});
});
服务:
.factory("getBase64Images", ['$http', function ($http) {
return {
get: function (url) {
return $http.get(
url, {
responseType: 'arraybuffer',
transformResponse: function(data) {
console.log(data);
return { data: data };
}
}
);
}
};
}]);
答案 1 :(得分:1)
我最终这样做..
我的$资源功能如下:
ENV.imagesEndpoint =' http://localhost:8080/
id =图片名称/ ID
getimages: $resource(ENV.imagesEndpoint + id, {}, {
get: {
method: 'GET',
isArray: false,
responseType: 'arraybuffer',
transformResponse: function(data) {
// Stores the ArrayBuffer object in a property called "data"
return { data: data };
}
//headers: {'Content-Type': 'image/jpeg;charset=utf-8;base64'}
}
})
我的控制器看起来像:
angular.forEach($scope.images, function(imageid) {
filefactory(imageid).getimages.get().$promise.then(function(value) {
$timeout(function() {
var blob = new Blob([value.data], {type: 'image/jpeg'});
blob.name = 'file.jpg';
$scope.obj.flow.addFile(blob);
});
});
});
答案 2 :(得分:0)
我在此提供的解决方案基于此处的帖子:
Creating a Blob from a base64 string in JavaScript
我面临类似的情况,但是使用Base64将图像存储在服务器上。当加载网页并从数据库中检索图像时,必须将这些图像添加回flow.files
数组。使用Base64字符串将图像保存在数据库中。因此,在页面加载期间,我唯一的方法是将Base64字符串转换为Blob并将文件添加回flow.files
数组。
这使得流控制器在从数据库加载页面后能够正常运行。
以下是步骤:
添加指令load-photo
并将其添加到输入元素additional_image1
,该元素具有使用jQuery从文档就绪事件中的数据库加载的Base64字符串。
添加一个指令以访问该元素并调用范围函数$scope.loadPhoto
准备加载照片。
在加载照片功能中,将Base64转换为Blob并将文件添加到流控制中。
确保范围变量$scope.imageStringB64
和输入元素additional_image1
手动同步,因为ng-model
没有按预期工作。这是因为angular之外的jQuery代码正在从数据库加载输入元素,我发现它们没有动态绑定。
JavaScript代码:
app.directive('loadPhoto', function () {
return function (scope, element, attrs) {
//This directive 'load-photo' is required to access the DOM element inside the scope
//This will get the Base64 string of the image which is stored in the input element
angular.element(document).ready(function () {
scope.loadPhoto(element[0]);
})
}
})
app.controller('photosController', ['$scope', '$http', '$timeout',
function ($scope, $http, $timeout) {
...
var BLANK_IMG_URL = "//:0";
$scope.removeFile = function () {
//debugger;
$scope.$flow.cancel();
$scope.imageStringB64 = '';
$scope.imageString = BLANK_IMG_URL;
}
$scope.loadPhoto = function (elem) {
//Load photo from Database
//The photo Base64 is stored in the input element 'elem'
var blobImage;
var tmpBase64;
tmpBase64 = angular.element(elem).val();
if (tmpBase64) {
//Convert Base64 to Blob object
blobImage = b64toBlob(tmpBase64, 'image/png');
blobImage.name = "image.png";
//Add the Blob object to flow files.
$scope.$flow.addFile(blobImage);
}
}
...
}]);
HTML代码:
<div class="photo-wrapper" ng-controller="photosController"
flow-init
flow-file-added="!isAppraiserSigned() && !!{png:1,gif:1,jpg:1,jpeg:1}[$file.getExtension()]"
flow-files-submitted="$flow.upload()">
<h4 class='photo-title'>Photo 1</h4>
<div class="property-photo drag-drop-photo" ng-hide="$flow.files.length" flow-drop
flow-drag-enter="isAppraiserSigned()?style={}:style={border:'4px solid green'}" flow-drag-leave="style={}" ng-style="style">
<div class='drag-drop-lbl'>Drop file here</div>
</div>
<div class="property-photo" flow-drop ng-show="$flow.files.length"
flow-drag-enter="isAppraiserSigned()?style={}:style={border:'4px solid green'}" flow-drag-leave="style={}" ng-style="style">
<img id="additional_image1_section" style="max-height:100%" flow-img="$flow.files[0]" />
<input id="additional_image1" name = "additional_image1" ng-hide="true" type="text" ng-model="imageStringB64" load-photo/>
</div>
<div>
<a href="#" class="btn" ng-hide="$flow.files.length" flow-btn flow-attrs="{accept:'image/*'}"><%=selectImageLbl%></a>
<a href="#" class="btn" ng-show="$flow.files.length" flow-btn flow-attrs="{accept:'image/*'}">Change</a>
<a href="#" class="btn btn-danger" ng-show="$flow.files.length"
ng-click="removeFile()">
Remove
</a>
</div>
<div class='photo-description'>
<label class='description-lbl' for='additional_image_describe1'><%=descriptionLbl%></label>
<input class='description' id='additional_image_describe1' name='additional_image_describe1' type="text" />
</div>
</div>
有关将Base64图像转换为blob并返回Base64的更多选项,请参阅此代码示例: