我已经看过很多这方面的例子,但似乎仍无法让我的工作。
我有一个包含图像信息的对象数组。例如:
$scope.images = [
{
"id": 1,
"type": "cloud",
"caller_id": "me@me.me",
"image_path": "file:///C:\\Users\\Public\\Pictures\\Sample Pictures\\Chrysanthemum.jpg",
"image_results": 23,
"image_id": 3243242
},
{
"id": 2,
"type": "cloud",
"caller_id": "me@me.me",
"image_path": "file:///C:\\Users\\Public\\Pictures\\Sample Pictures\\Desert.jpg",
"image_results": 98,
"image_id": 3125312
},
{
"id": 3,
"type": "cloud",
"caller_id": "me@me.me",
"image_path": "file:///C:\\Users\\Public\\Pictures\\Sample Pictures\\DSC_9864.jpg",
"image_results": 1,
"image_id": 927192
}
];
我需要能够在图库中显示这些图像。我一直在为this gallery建模我的画廊,供参考。
我试图通过在我的控制器中执行以下操作来显示第一张图像:
//Image information
$scope.currentImage = _.first($scope.images);
//Display image
var reader = new FileReader();
reader.onload = function(event) {
$scope.$apply(function() {
$scope.image_source = reader.result;
});
};
reader.readAsDataURL($scope.currentImage.image_path);
$scope.setCurrentImage = function(image){
$scope.currentImage = image;
}
在我的HTML中,我有:
<div class="container">
<div class="row">
<div class="col-xs-12">
<div ng-controller="jobsSampleImageController">
<h2>AngularJS Powered Photo Album <small>by Josh Adamous</small> </h2>
<div class="row">
<div class="col-md-9">
<div class="albumImage">
<img id="current_image" ng-src="{{image_source}}" alt="{{currentImage.caller_id}}"/>
</div>
<h3>{{currentImage.caller_id}}</h3>
</div><!-- End of Column -->
<div class="col-md-3">
<div class="wrapper">
<ul class="list">
<li ng-repeat="image in images" ng-click="setCurrentImage(image)">
<img ng-src="{{image_source}}" alt="{{image.caller_id}}"/>
</li>
</ul><!-- End of List -->
</div><!-- End of Wrapper -->
</div><!-- End of Column -->
</div><!-- End of Row -->
</div><!-- End of Album Controller -->
</div><!-- End of Column -->
</div><!-- End of Row -->
</div><!-- End of Container -->
这会导致错误:
TypeError:无法执行&#39; readAsDataURL&#39; on&#39; FileReader&#39;:参数1的类型不是&#39; Blob&#39;。
从我看过的例子中,我不完全确定他们何时获得图片blob?
答案 0 :(得分:0)
这对我有用。我有一个上传器项目,允许您删除图像,并在上传图像时显示图像,并使用FileReader
。
我的代码:
function handleDrop(event) {
var length = event.dataTransfer.files.length;
for (var i = 0; i < length; i++) {
var entry = event.dataTransfer.items[i].webkitGetAsEntry();
if (entry.isFile) {
console.log('File Uploaded', entry);
entry.file(function (myFile) {
if (entry.name.indexOf(".ini") < 0) {
handleThumbnails(myFile, entry.name, i)//This will handle displaying the images
}
}, errorHandler);
} else if (entry.isDirectory) {
}
}
};
function handleThumbnails(f, name, ind) { //Displaying images
var reader = new FileReader();
reader.onload = (function (theFile) {
return function (e) {
var img = document.createElement('img');
img.setAttribute("id", name + ind);
img.setAttribute("src", e.target.result);
img.setAttribute("class", "imagePreview");
img.setAttribute("title", name);
document.body.appendChild(img);
};
})(f);
reader.readAsDataURL(f);
};
你显然需要触发一些东西来接收图像。据我了解,未经获得许可,您无法访问本地文件。拖放将为该目录授予权限。