I'm using this module, https://github.com/nervgh/angular-file-upload
I am using their simple example, http://nervgh.github.io/pages/angular-file-upload/examples/simple/
When you click "Choose file" button, it will open a window which allows us to pick a file that we want to upload. What I would like to happen is to only allow specific file extensions to be clicked. Is there a non-documented configuration which will do that?
For example, in the config, we only allowed .txt extensions, when I click "Choose file" button, it will open up a window and show all the files. However, files that doesn't have the extension .txt will be disabled.
I'm not doing this for security purposes. I am just following the design/instructions provided to me. :) I can always use mitm tools to intercept and allow other extensions to be uploaded.
You can simply achieve your goal by doing this
accept=".txt"
<input ui-jq="filestyle" type="file" nv-file-select="" accept=".txt" uploader="uploader" data-icon="false" data-classButton="btn btn-default" data-classInput="form-control inline v-middle input-s" multiple>
来源：https://stackoverflow.com/questions/30928826/only-allow-specific-file-extensions-in-angular-file-upload-module-to-be-clickabl