> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/salesforce/forms/form-field-styling.md).

# Styling PDF form fields

Learn how to customize widget annotations with the getCustomStyles and getContainerCustomStyles functions. Extend createInnerElement for unique styling and event handling. Optimize your PDF viewer now

Implementing the [WidgetAnnotation's getCustomStyles function](https://sdk.apryse.com/api/web/Core.Annotations.WidgetAnnotation.html#WidgetAnnotation__anchor) allows you to add styling changes to particular types of widget annotations.

{% tabs %}
{% tab title="JavaScript (SDK v8.0+)" %}
{% code lineNumbers="true" %}

```js
// config.js
const { Annotations } = instance.Core;

Annotations.WidgetAnnotation.getCustomStyles = widget => {
  if (widget instanceof Annotations.TextWidgetAnnotation) {
    // can check widget properties
    if (widget.fieldName === 'f1-1') {
      return {
        'background-color': 'lightgreen'
      };
    }
    return {
      'background-color': 'lightblue',
      color: 'brown'
    };
  } else if (widget instanceof Annotations.PushButtonWidgetAnnotation) {
    return {
      'background-color': 'black',
      color: 'white'
    };
  } else if (widget instanceof Annotations.CheckButtonWidgetAnnotation) {
    return {
      'background-color': 'lightgray',
      opacity: 0.8
    };
  }
};
```

{% endcode %}

[Annotations.WidgetAnnotation](https://sdk.apryse.com/api/web/Core.Annotations.WidgetAnnotation.html)
{% endtab %}

{% tab title="JavaScript (SDK v6.0+)" %}
{% code lineNumbers="true" %}

```js
// config.js
const { docViewer, annotManager, Annotations } = instance;

Annotations.WidgetAnnotation.getCustomStyles = widget => {
  if (widget instanceof Annotations.TextWidgetAnnotation) {
    // can check widget properties
    if (widget.fieldName === 'f1-1') {
      return {
        'background-color': 'lightgreen'
      };
    }
    return {
      'background-color': 'lightblue',
      color: 'brown'
    };
  } else if (widget instanceof Annotations.PushButtonWidgetAnnotation) {
    return {
      'background-color': 'black',
      color: 'white'
    };
  } else if (widget instanceof Annotations.CheckButtonWidgetAnnotation) {
    return {
      'background-color': 'lightgray',
      opacity: 0.8
    };
  }
};
```

{% endcode %}

[Annotations.WidgetAnnotation](https://sdk.apryse.com/api/web/Core.Annotations.WidgetAnnotation.html)
{% endtab %}
{% endtabs %}

Implementing the [WidgetAnnotation's getContainerCustomStyles function](https://sdk.apryse.com/api/web/Core.Annotations.WidgetAnnotation.html#WidgetAnnotation__anchor) allows you to add styling changes to the ***container element*** of the widget annotation.

{% tabs %}
{% tab title="JavaScript (SDK v8.0+)" %}
{% code lineNumbers="true" %}

```js
// config.js
const { Annotations } = instance.Core;

Annotations.WidgetAnnotation.getContainerCustomStyles = widget => {
  if (widget instanceof Annotations.TextWidgetAnnotation) {
    // can check widget properties
    if (widget.fieldName === 'f1-1') {
      return {
        'background-color': 'lightgreen'
      };
    }
    return {
      'background-color': 'lightblue',
      color: 'brown'
    };
  } else if (widget instanceof Annotations.PushButtonWidgetAnnotation) {
    return {
      'background-color': 'black',
      color: 'white'
    };
  } else if (widget instanceof Annotations.CheckButtonWidgetAnnotation) {
    return {
      'background-color': 'lightgray',
      opacity: 0.8
    };
  }
};
```

{% endcode %}

[Annotations.WidgetAnnotation](https://sdk.apryse.com/api/web/Core.Annotations.WidgetAnnotation.html)
{% endtab %}

{% tab title="JavaScript (SDK v6.0+)" %}
{% code lineNumbers="true" %}

```js
// config.js
const { docViewer, annotManager, Annotations } = instance;

Annotations.WidgetAnnotation.getContainerCustomStyles = widget => {
  if (widget instanceof Annotations.TextWidgetAnnotation) {
    // can check widget properties
    if (widget.fieldName === 'f1-1') {
      return {
        'background-color': 'lightgreen'
      };
    }
    return {
      'background-color': 'lightblue',
      color: 'brown'
    };
  } else if (widget instanceof Annotations.PushButtonWidgetAnnotation) {
    return {
      'background-color': 'black',
      color: 'white'
    };
  } else if (widget instanceof Annotations.CheckButtonWidgetAnnotation) {
    return {
      'background-color': 'lightgray',
      opacity: 0.8
    };
  }
};
```

{% endcode %}

[Annotations.WidgetAnnotation](https://sdk.apryse.com/api/web/Core.Annotations.WidgetAnnotation.html)
{% endtab %}
{% endtabs %}

You can also extend the createInnerElement function on widget annotations. This allows you to use your own DOM elements for the display or just to add your own event handlers.

{% tabs %}
{% tab title="JavaScript (SDK v8.0+)" %}
{% code lineNumbers="true" %}

```js
// config.js
const { Annotations } = instance.Core;

const createInnerElement = Annotations.CheckButtonWidgetAnnotation.prototype.createInnerElement;
Annotations.CheckButtonWidgetAnnotation.prototype.createInnerElement = function() {
  const button = this;

  const el = createInnerElement.apply(this, arguments);
  el.addEventListener('click', () => {
    console.log('check button clicked', button.fieldName);
  });

  return el;
};
```

{% endcode %}

[Annotations.CheckButtonWidgetAnnotation](https://sdk.apryse.com/api/web/Core.Annotations.CheckButtonWidgetAnnotation.html)
{% endtab %}

{% tab title="JavaScript (SDK v6.0+)" %}
{% code lineNumbers="true" %}

```js
// config.js
const { Annotations } = instance;

const createInnerElement = Annotations.CheckButtonWidgetAnnotation.prototype.createInnerElement;
Annotations.CheckButtonWidgetAnnotation.prototype.createInnerElement = function() {
  const button = this;

  const el = createInnerElement.apply(this, arguments);
  el.addEventListener('click', () => {
    console.log('check button clicked', button.fieldName);
  });

  return el;
};
```

{% endcode %}

[Annotations.CheckButtonWidgetAnnotation](https://sdk.apryse.com/api/web/Core.Annotations.CheckButtonWidgetAnnotation.html)
{% endtab %}
{% endtabs %}


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