有什么最好的例子可以在 AngularJS 或 Angular 任何版本中拖动和上传图像吗？我没有找到任何 Angular 东西。
我有这个例子，但我的要求是，我在框中有一个 + 按钮。如果我将任何图像拖放到该 + 按钮上，它应该上传，并且该框旁边应该会打开另一个框。请查看图片。
像这样我需要上传更多图片。如果有任何 fiddle 或示例，请发送给我。
// Generated by CoffeeScript 1.6.3
// Couldn't get JSFiddle to work with CoffeeScript as advertised - Link to CoffeeScript Gist: https://gist.github.com/lsiv568/5623361
(function() {
'use strict';
angular.module('reusableThings', []).directive('fileDropzone', function() {
return {
restrict: 'A',
scope: {
file: '=',
fileName: '='
},
link: function(scope, element, attrs) {
var checkSize, isTypeValid, processDragOverOrEnter, validMimeTypes;
processDragOverOrEnter = function(event) {
if (event != null) {
event.preventDefault();
}
event.dataTransfer.effectAllowed = 'copy';
return false;
};
validMimeTypes = attrs.fileDropzone;
checkSize = function(size) {
var _ref;
if (((_ref = attrs.maxFileSize) === (void 0) || _ref === '') || (size / 1024) / 1024 < attrs.maxFileSize) {
return true;
} else {
alert("File must be smaller than " + attrs.maxFileSize + " MB");
return false;
}
};
isTypeValid = function(type) {
if ((validMimeTypes === (void 0) || validMimeTypes === '') || validMimeTypes.indexOf(type) > -1) {
return true;
} else {
alert("Invalid file type. File must be one of following types " + validMimeTypes);
return false;
}
};
element.bind('dragover', processDragOverOrEnter);
element.bind('dragenter', processDragOverOrEnter);
return element.bind('drop', function(event) {
var file, name, reader, size, type;
if (event != null) {
event.preventDefault();
}
reader = new FileReader();
reader.onload = function(evt) {
if (checkSize(size) && isTypeValid(type)) {
return scope.$apply(function() {
scope.file = evt.target.result;
if (angular.isString(scope.fileName)) {
return scope.fileName = name;
}
});
}
};
file = event.dataTransfer.files[0];
name = file.name;
type = file.type;
size = file.size;
reader.readAsDataURL(file);
return false;
});
}
};
});
}).call(this);
(function() {
'use strict';
angular.module('reusableThings').controller('TestCtrl', function($scope) {
$scope.image = null
$scope.imageFileName = ''
});
}).call(this);.dropzone {
width: 250px;
height: 45px;
border: 1px solid #ccc;
text-align: center;
padding: 30px;
margin: 20px;
font-family: Arial;
position: absolute;
top: 0;
left: 0;
}
.image-container {
width: 312px;
height: 312px;
margin: 20px;
position: absolute;
top: 0;
left: 0;
z-index: 2;
}
.image-container img {
max-width: 100%;
}
.file-name {
font-family: Arial;
}<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="reusableThings" ng-controller="TestCtrl">
<div class="dropzone" file-dropzone="[image/png, image/jpeg, image/gif]" file="image" file-name="imageFileName" data-max-file-size="3">
<span>Drop Image Here</span>
</div>
<div class="image-container" ng-show="image">
<img ng-src={{image}} />
<span class="file-name">{{imageFileName}}</span>
</div>
</div>最佳答案
让我们就一些步骤达成一致:
- 为了支持范围内的多个图像，显然，您应该保留一个图像数组。
- 我们希望重新使用拖放区，以便在用户将图像拖放到其中后，该图像将位于其旁边，并且用户可以拖放另一个图像。因此，我们不想处理范围，我们将解析文件(src 和名称)并使用这些参数调用回调
onDrop，控件本身将处理它。
请阅读我在代码中的评论
// Generated by CoffeeScript 1.6.3
// Couldn't get JSFiddle to work with CoffeeScript as advertised - Link to CoffeeScript Gist: https://gist.github.com/lsiv568/5623361
(function() {
'use strict';
angular.module('reusableThings', []).directive('fileDropzone', function() {
return {
restrict: 'A',
scope: {
// get only a drop callback which will be called with the image object
image: '='
},
link: function(scope, element, attrs) {
var checkSize, isTypeValid, processDragOverOrEnter, validMimeTypes;
processDragOverOrEnter = function(event) {
if (event != null) {
event.preventDefault();
}
event.dataTransfer.effectAllowed = 'copy';
return false;
};
validMimeTypes = attrs.fileDropzone;
checkSize = function(size) {
var _ref;
if (((_ref = attrs.maxFileSize) === (void 0) || _ref === '') || (size / 1024) / 1024 < attrs.maxFileSize) {
return true;
} else {
alert("File must be smaller than " + attrs.maxFileSize + " MB");
return false;
}
};
isTypeValid = function(type) {
if ((validMimeTypes === (void 0) || validMimeTypes === '') || validMimeTypes.indexOf(type) > -1) {
return true;
} else {
alert("Invalid file type. File must be one of following types " + validMimeTypes);
return false;
}
};
element.bind('dragover', processDragOverOrEnter);
element.bind('dragenter', processDragOverOrEnter);
return element.bind('drop', function(event) {
var file, name, reader, size, type;
if (event != null) {
event.preventDefault();
}
reader = new FileReader();
reader.onload = function(evt) {
if (checkSize(size) && isTypeValid(type)) {
return scope.$apply(function() {
// call the callback with the data
scope.image.image = evt.target.result,
scope.image.imageFileName = name;
});
}
};
file = event.dataTransfer.files[0];
name = file.name;
type = file.type;
size = file.size;
reader.readAsDataURL(file);
return false;
});
}
};
});
}).call(this);
(function() {
'use strict';
angular.module('reusableThings').controller('TestCtrl', function($scope) {
// keep in array instead of variables on the scope
$scope.images = [];
$scope.drop = (image) => {
// console.log(image);
$scope.images.unshift(image);
}
});
}).call(this);.container {
position: relative;
width: 312px;
height: 312px;
margin: 20px;
}
.dropzone {
border: 1px solid #ccc;
text-align: center;
padding: 30px;
font-family: Arial;
position: absolute;
top: 0;
left: 0;
width: 250px;
height: 45px;
}
.image-container {
width: 100%;
height: 100%;
margin: 20px;
position: absolute;
top: 0;
left: 0;
z-index: 2;
}
.image-container img {
max-width: 100%;
}
.file-name {
font-family: Arial;
}
.button {
width: 50px;
height: 50px;
border-radius: 50%;
text-align: center;
border: 1px solid;
font-size: 25px;
color: #aaa;
}<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="reusableThings" ng-controller="TestCtrl">
<div class="container" ng-repeat="image in images">
<div ng-if="!image.image" class="dropzone" file-dropzone="[image/png, image/jpeg, image/gif]" image="image" data-max-file-size="3">
<span>Drop Image Here</span>
</div>
<div class="image-container" ng-if="image.image">
<img ng-src={{image.image}} />
<span class="file-name">{{image.imageFileName}}</span>
</div>
</div>
<button class="button" ng-click="images.push({})">+</button>
</div>思路可能会发生一些复杂的变化。如果有任何不清楚的地方，请告诉我。
关于javascript - 将多个图像拖放到 Angular 框中并上传，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/50790919/