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# ng-flow [](https://travis-ci.org/flowjs/ng-flow) [](https://codeclimate.com/github/flowjs/ng-flow/coverage)
[](https://saucelabs.com/u/ng-flow)
ng-flow is a [Flow.js](https://github.com/flowjs/flow.js) extensions for angular.js framework, no 3rd party JS dependencies required!
Demo: http://flowjs.github.io/ng-flow/
How can I install it?
============
1) Get the library:
**Direct Download**
Download a latest build from https://github.com/flowjs/ng-flow/releases
it contains development and minified production files in `dist/` directory,
they are also concatenated with core flow.js library.
**Using Bower**
bower install ng-flow#~2
**Git Clone**
git clone https://github.com/flowjs/ng-flow
**Using Yeoman**
bower install "ng-flow#~2" --save
grunt bower-install
2) Add the module to your app as a dependency:
angular.module('app', ['flow'])
3) Include the files in your project
```html
<!-- concatenated flow.js + ng-flow libraries -->
<script src="ng-flow/dist/ng-flow-standalone.min.js"></script>
<!-- or include the files separately -->
<script src="flow.js/dist/flow.min.js"></script>
<script src="ng-flow/dist/ng-flow.min.js"></script>
```
How can I use it?
============
First of all wrap places there you are going to use Flow.js
````html
<div flow-init>
... other flow directives goes here ...
</div>
````
This directive is going to add $flow variable to current scope.
Also directive can be nested, because `$flow` variable is going to be overridden.
`$flow` is instance of [Flow](https://github.com/flowjs/flow.js#flow).
Secondly you need to assign some upload buttons:
````html
<input type="file" flow-btn />
<input type="file" flow-btn flow-directory />
Input OR Other element as upload button
<span flow-btn>Upload File</span>
````
First button is for normal uploads and second is for directory uploads.
Note: avoid using `<a>` and `<button>` tags as file upload buttons, use `<span>` instead.
Now you need to display uploaded files, all you need to do is to loop files array.
Files array is attached to flow object named `$flow`.
````html
<tr ng-repeat="file in $flow.files">
<td>{{$index+1}}</td>
<td>{{file.name}}</td>
</tr>
````
file is instance of [FlowFile](https://github.com/flowjs/flow.js#flowfile).
### Quick setup
````html
<div flow-init="{target: '/upload'}"
flow-files-submitted="$flow.upload()"
flow-file-success="$file.msg = $message">
<input type="file" flow-btn/>
Input OR Other element as upload button
<span class="btn" flow-btn>Upload File</span>
<table>
<tr ng-repeat="file in $flow.files">
<td>{{$index+1}}</td>
<td>{{file.name}}</td>
<td>{{file.msg}}</td>
</tr>
</table>
</div>
```
Need more examples?
============
Clone this repository and go to "ng-flow/samples/basic/index.html".
Single image upload "ng-flow/samples/image/index.html".
How can I drop files?
============
Use `flow-drop` directive:
````html
<div class="alert" flow-drop>
Drag And Drop your file here
</div>
````
Note: in most cases `flow-drop` must be used together with `flow-prevent-drop` directive on `body`
element, because it prevents file from being loaded in the browser.
### Prevent dropping files on a document
Use `flow-prevent-drop` directive on `body` element:
````html
<body flow-prevent-drop>
</body>
````
### How to add some styles while dropping a file?
Use `flow-drag-enter` directive:
````html
<div flow-drag-enter="style={border:'4px solid green'}" flow-drag-leave="style={}"
ng-style="style">
</div>
````
Note: `flow-drag-leave` attribute can't be used alone, it is a part of `flow-drag-enter` directive.
### How to dynamically disable drop area?
````html
<div class="alert" flow-drop flow-drop-enabled="config.enabled">
Drag And Drop your file here
</div>
````
See example at `samples/dataurl/`.
How can I preview uploaded image?
============
Use flow-img directive:
````html
<img flow-img="$flow.files[0]" />
````
Image will be automatically updated once file is added. No need to start upload.
How can I set options for flow.js?
============
Use config:
````javascript
var app = angular.module('app', ['flow'])
.config(['flowFactoryProvider', function (flowFactoryProvider) {
flowFactoryProvider.defaults = {
target: '/upload',
permanentErrors:[404, 500, 501]
};
// You can also set default events:
flowFactoryProvider.on('catchAll', function (event) {
...
});
// Can be used with different implementations of Flow.js
// flowFactoryProvider.factory = fustyFlowFactory;
}]);
````
also can be configured on "flow-init" directive:
````html
<div flow-init="{target:'/uploader'}">
</div>
````
How can I catch events?
============
Events are listed inside `flow-init` directive:
````html
<div flow-init
flow-file-success="someHandlerMethod( $file, $message, $flow )"
flow-file-progress="someHandlerMethod( $file, $flow )"
flow-file-added="someHandlerMethod( $file, $event, $flow )"
flow-files-added="someHandlerMethod( $files, $event, $flow )"
flow-files-submitted="someHandlerMethod( $files, $event, $flow )"
flow-file-retry="someHandlerMethod( $file, $flow )"
flow-file-error="someHandlerMethod( $file, $message, $flow )"
flow-error="someHandlerMethod( $file, $message, $flow )"
flow-complete=" ... "
flow-upload-started=" ... "
flow-progress=" ... "
>
<div flow-file-progress=" ... events can be also assigned inside flow-init ... "></div>
</div>
````
### How can I catch an event in a controller?
If controller is on the same scope as `flow-init` directive or in a child scope,
then we can catch events with `$on`. Events are prefixed with `flow::`.
````javascript
$scope.$on('flow::fileAdded', function (event, $flow, flowFile) {
event.preventDefault();//prevent file from uploading
});
````
second argument is always a `flow` instance and then follows event specific arguments.
How can I assign flow to a parent scope?
============
Use `flow-name` attribute and set it to any variable in the scope.
````html
<div flow-init flow-name="obj.flow">
... Flow is set to obj.flow ...
I have uploaded files: #{{obj.flow.files.length}}
</div>
````
````javascript
$scope.obj = {}; // variable "obj" must be initialized on the scope
````
How can I initialize flow with an existing flow object ?
============
Use `flow-object` attribute and set it with the existing flow object on scope.
````html
<div flow-init flow-object="existingFlowObject">
... Flow is initialized with existingFlowObject, no new Flow object is created ...
There are already {{ existingFLowObject.files.length }} files uploaded,
which is equal to {{ $flow.files.length }}.
</div>
````
How can I support older browsers?
============
Go to https://github.com/flowjs/fusty-flow.js
and add to your config:
````javascript
var app = angular.module('app', ['flow'])
.config(['flowFactoryProvider', function (flowFactoryProvider) {
flowFactoryProvider.factory = fustyFlowFactory;
}]);
````
Contribution
============
To ensure consistency throughout the source code, keep these rules in mind as you are working:
* All features or bug fixes must be tested by one or more specs.
* With the exceptions listed below, we follow the rules contained in [Google's JavaScript Style Guide](http://google-styleguide.googlecode.com/svn/trunk/javascriptguide.xml):
* Wrap all code at 100 characters.
* Instead of complex inheritance hierarchies, we prefer simple objects. We use prototypical
inheritance only when absolutely necessary.