回调

Summernote 支持初始化回调和 jquery 自定义事件样式回调。

> **选项中回调的位置在 v0.7.0 之后有所更改**
v0.7.0 之后，所有回调都应由 callbacks 对象封装。

------------

> **回调仅适用于 v0.6.5 之后的驼峰字符串**
小写字符串用于基本事件名称（例如：`oninit`、`onenter`、`onfocus`、`onblur`、`onkeyup`、`onkeydown`、`onpaste`）。相比之下，高级功能的回调名称则使用了驼峰字符。这既不一致，使用起来也很混乱。因此，我们将所有小写的回调名称重新命名为驼峰字符串。

#### onBeforeCommand
WIP：需要进行解释

### onChange
- IE9-10: DOMCharacterDataModified, DOMSubtreeModified, DOMNodeInserted
- Chrome, FF: input

```javascript
// onChange callback
$('#summernote').summernote({
  callbacks: {
    onChange: function(contents, $editable) {
      console.log('onChange:', contents, $editable);
    }
  }
});

// summernote.change
$('#summernote').on('summernote.change', function(we, contents, $editable) {
  console.log('summernote\'s content is changed.');
});
```

### onChangeCodeview
WIP：需要进行解释

### onDialogShown
WIP：需要进行解释

### onEnter
```javascript
// onEnter callback
$('#summernote').summernote({
  callbacks: {
    onEnter: function() {
      console.log('Enter/Return key pressed');
    }
  }
});

// summernote.enter
$('#summernote').on('summernote.enter', function() {
  console.log('Enter/Return key pressed');
});
```
### onFocus, onBlur, onBlurCodeview
```javascript
// onFocus callback
$('#summernote').summernote({
  callbacks: {
    onFocus: function() {
      console.log('Editable area is focused');
    }
  }
});

// summernote.focus
$('#summernote').on('summernote.focus', function() {
  console.log('Editable area is focused');
});
```

```javascript
// onBlur callback
$('#summernote').summernote({
  callbacks: {
    onBlur: function() {
      console.log('Editable area loses focus');
    }
  }
});

// summernote.blur
$('#summernote').on('summernote.blur', function() {
  console.log('Editable area loses focus');
});
```

```javascript
// onBlurCodeview callback
$('#summernote').summernote({
  callbacks: {
    onBlurCodeview: function() {
      console.log('Codeview area loses focus');
    }
  }
});

// summernote.blur.codeview
$('#summernote').on('summernote.blur.codeview', function() {
  console.log('Codeview area loses focus');
});
```

### onImageLinkInsert
通过 url 覆盖插入图像。

```javascript
// onImageLinkInsert callback
$('#summernote').summernote({
  callbacks: {
    onImageLinkInsert: function(url) {
      // url is the image url from the dialog
      $img = $('<img>').attr({ src: url })
      $summernote.summernote('insertNode', $img[0]);
    }
  }
});

// summernote.image.link.insert
$('#summernote').on('summernote.image.link.insert', function(we, url) {
  // url is the image url from the dialog
  $img = $('<img>').attr({ src: url })
  $summernote.summernote('insertNode', $img[0]);
});
```
### onImageUpload
覆盖图片上传处理程序（默认：IMG 标签上的 `base64` `dataURL`）。您可以将图片上传到服务器或 AWS S3：更多...

```javascript
// onImageUpload callback
$('#summernote').summernote({
  callbacks: {
    onImageUpload: function(files) {
      // upload image to server and create imgNode...
      $summernote.summernote('insertNode', imgNode);
    }
  }
});

// summernote.image.upload
$('#summernote').on('summernote.image.upload', function(we, files) {
  // upload image to server and create imgNode...
  $summernote.summernote('insertNode', imgNode);
});
```
### oonImageUploadError
WIP：需要进行解释

### onInit
```javascript
// onInit callback
$('#summernote').summernote({
  callbacks: {
    onInit: function() {
      console.log('Summernote is launched');
    }
  }
});

// summernote.init
$('#summernote').on('summernote.init', function() {
  console.log('Summernote is launched');
});
```
### onKeyup, onKeydown
```javascript
// onKeyup callback
$('#summernote').summernote({
  callbacks: {
    onKeyup: function(e) {
      console.log('Key is released:', e.keyCode);
    }
  }
});

// summernote.keyup
$('#summernote').on('summernote.keyup', function(we, e) {
  console.log('Key is released:', e.keyCode);
});
```
```javascript
// onKeydown callback
$('#summernote').summernote({
  callbacks: {
    onKeydown: function(e) {
      console.log('Key is downed:', e.keyCode);
    }
  }
});

// summernote.keydown
$('#summernote').on('summernote.keydown', function(we, e) {
  console.log('Key is downed:', e.keyCode);
});
```
### onMouseDown,onMouseUp
#### onPaste
```javascript
// onPaste callback
$('#summernote').summernote({
  callbacks: {
    onPaste: function(e) {
      console.log('Called event paste');
    }
  }
});

// summernote.paste
$('#summernote').on('summernote.paste', function(e) {
  console.log('Called event paste');
});
```
#### onScroll
WIP: Need to work on an explanation