使用angular-file-upload上传Angular-JS文件-限制文件类型，大小

Question

For File Upload i am using following module: https://github.com/nervgh/angular-file-upload

The html snippet looks like:

    <div nv-file-drop="" uploader="uploader" options="{ url: '/whatever/uploadfile'}" 
    removeAfterUpload="true" >
    <div nv-file-over="" uploader="uploader" over-class="another-file-over-class" 
class="well my-drop-zone" >
    You may drag drop files here
    </div>
    </div>

How can i ensure that:
- only images (png/jpg) can be dropped on the file drop area?
- File Sizes are Limited.

Apparently filters could be used - but cannot find any example of that.

Answer 1

Checkout the source code for some examples on how the filters are used ( https://github.com/nervgh/angular-file-upload/blob/master/src/module.js#L51 )

this.filters.unshift({name: 'queueLimit', fn: this._queueLimitFilter});
this.filters.unshift({name: 'folder', fn: this._folderFilter});

Queue limit filter ( https://github.com/nervgh/angular-file-upload/blob/master/src/module.js#L357 )

FileUploader.prototype._queueLimitFilter = function() {
    return this.queue.length < this.queueLimit;
};

Folder Filter ( https://github.com/nervgh/angular-file-upload/blob/master/src/module.js#L349 )

FileUploader.prototype._folderFilter = function(item) {
    return !!(item.size || item.type);
};

Based on those examples i guess the filters can be used as such:

javascript

var uploadOptions = {
    url: '/whatever/uploadfile',
    filters: []
};

// File must be jpeg or png
uploadOptions.filters.push({ name: 'imagefilter', fn: function(item) {
   return item.type == 'image/jpeg' || item.type == 'image/png';
}});

// File must not be larger then some size
uploadOptions.filters.push({ name: 'sizeFilter', fn: function(item) {
   return item.size < 10000;
}});

$scope.uploadOptions = uploadOptions;

html

<div nv-file-drop="" uploader="uploader" options="uploadOptions" removeAfterUpload="true" >
    <div nv-file-over="" uploader="uploader" over-class="another-file-over-class" class="well my-drop-zone" >
    You may drag drop files here
    </div>
</div>