Javascript 使用jpeg/jpg作为blob填充ng流
我目前正在尝试使用来自我的Web服务器(nodejs http服务器)的图像填充ng flow,我发现了以下线程: 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$resource获取url时,如: 然后从$resource获取值,并将其添加到图像丢失的blob中-在ng flow中,它表示blob为15kb-而不是图像实际的700kb 我已经读到图片可以是base64格式的,但是我的google开发控制台说:Javascript 使用jpeg/jpg作为blob填充ng流,javascript,angularjs,blob,angular-resource,ng-flow,Javascript,Angularjs,Blob,Angular Resource,Ng Flow,我目前正在尝试使用来自我的Web服务器(nodejs http服务器)的图像填充ng flow,我发现了以下线程: 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$resource获取url时,如: 然后从$resource获取值,并将其添加到图像丢失的blob中-在ng flow中,它表示blob为15kb-而不是图像实际的700kb 我已经读到图片可以是base64格式的,但是我的google开发控制台说: co
content-length:780831
content-type:image/jpeg; charset=utf-8
如果我看一下Googledev控制台中的响应数据,就会发现有很多问号(我猜它无法显示字符)
如何正确格式化响应,以便使用addFile(blob)函数将其添加到ng流中?我最后就是这样做的 我的$resource函数如下所示:
angular.forEach($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);
});
});
});
ENV.imagesEndpoint=
id=图像名称/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';
$scope.obj.flow.addFile(blob);
});
});
});
我最后就这样做了 我的$resource函数如下所示:
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);
});
});
});
ENV.imagesEndpoint=
id=图像名称/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';
$scope.obj.flow.addFile(blob);
});
});
});
我做了一些结合了cvjensen解决方案和penner的 控制器: 首先,我从db读取图像并将其存储在$scope.project.images中:
$scope.project.images : [
{
"image_type" : "image/jpeg",
"src" : "/images/uploaded/flow-122256-fontiosojpg.1",
"alt" : "fontioso.jpg",
"_id" : ObjectId("5608ef37f7672d8b1fcab111")
}
]
然后:
服务:
.factory("getBase64Images", ['$http', function ($http) {
return {
get: function (url) {
return $http.get(
url, {
responseType: 'arraybuffer',
transformResponse: function(data) {
console.log(data);
return { data: data };
}
}
);
}
};
}]);
我做了一些结合了cvjensen解决方案和penner的 控制器: 首先,我从db读取图像并将其存储在$scope.project.images中:
$scope.project.images : [
{
"image_type" : "image/jpeg",
"src" : "/images/uploaded/flow-122256-fontiosojpg.1",
"alt" : "fontioso.jpg",
"_id" : ObjectId("5608ef37f7672d8b1fcab111")
}
]
然后:
服务:
.factory("getBase64Images", ['$http', function ($http) {
return {
get: function (url) {
return $http.get(
url, {
responseType: 'arraybuffer',
transformResponse: function(data) {
console.log(data);
return { data: data };
}
}
);
}
};
}]);
我将在这里提供的解决方案基于以下帖子: 我也遇到过类似的情况,但图像是使用Base64存储在服务器上的。当加载网页并从数据库检索图像时,这些图像必须添加回
flow.files
数组。图像使用Base64字符串保存在数据库中。因此,在页面加载期间,我唯一的方法是将Base64字符串转换为Blob,并将文件添加回flow.files
数组
这使流量控制器能够在从数据库加载页面后正常工作
以下是步骤:
load photo
,并将其添加到输入元素additional_image1
,该元素使用jQuery在文档就绪事件上从数据库加载Base64字符串$scope.loadPhoto
$scope.imageStringB64
和输入元素额外的\u image1
手动同步,因为ng model
没有按预期工作。这是因为angular之外的jQuery代码正在从数据库加载输入元素,我发现它们不是动态绑定的app.directive('loadPhoto', function () {
return function (scope, element, attrs) {
//This directive 'load-photo' is required to access the DOM element inside the scope
//This will get the Base64 string of the image which is stored in the input element
angular.element(document).ready(function () {
scope.loadPhoto(element[0]);
})
}
})
app.controller('photosController', ['$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>
照片1
把文件放在这里
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:
我将在此处提供的解决方案基于此处的帖子: 我也遇到过类似的情况,但图像是使用Base64存储在服务器上的。当加载网页并从数据库检索图像时,这些图像必须添加回
flow.files
数组。图像使用Base64字符串保存在数据库中。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
这使流量控制器能够在从数据库加载页面后正常工作
以下是步骤:
load photo
,并将其添加到输入元素additional_image1
,该元素使用jQuery在文档就绪事件上从数据库加载Base64字符串$scope.loadPhoto
$scope.imageStringB64
和输入元素额外的\u image1
手动同步,因为ng model
没有按预期工作。这是因为angular之外的jQuery代码正在从数据库加载输入元素,我发现它们不是动态绑定的app.directive('loadPhoto', function () {
return function (scope, element, attrs) {
//This directive 'load-photo' is required to access the DOM element inside the scope
//This will get the Base64 string of the image which is stored in the input element
angular.element(document).ready(function () {
scope.loadPhoto(element[0]);
})
}
})
app.controller('photosController', ['$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>
照片1
把文件放在这里
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: