> 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/web/forms/fill-fields.md).

# Fill PDF form fields in JavaScript

Learn how to fill PDF form fields in JavaScript with this comprehensive guide. Access and fill any field by its ID, iterate over all fields, and listen for field changes easily. The Apryse Web SDK str

This guide will walk you through how to programmatically fill out PDF form fields. You can also try it now with our [form fill demo](https://showcase.apryse.com/pdf-forms).

## Filling widget values

You can fill widget values by using the [`WidgetAnnotation.setValue`](https://sdk.apryse.com/api/web/Core.Annotations.WidgetAnnotation.html#setValue__anchor) API. This also internally updates the associated field value.The following sample code shows how to clear the value of all widgets in a document.

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

```js
WebViewer(...)
.then(instance => {
  const { documentViewer, annotationManager, Annotations } = instance.Core;

  documentViewer.addEventListener('annotationsLoaded', () => {
    const widgets = annotationManager.getAnnotationsList().filter(annotation => annotation instanceof Annotations.WidgetAnnotation);
    widgets.forEach((widget) => {
      widget.setValue('');
    });
  });
});
```

{% endcode %}

[WidgetAnnotation.setValue](https://sdk.apryse.com/api/web/Core.Annotations.WidgetAnnotation.html#setValue__anchor) [DocumentViewer#annotationsLoaded](https://sdk.apryse.com/api/web/Core.DocumentViewer.html#event:annotationsLoaded__anchor)
{% endtab %}

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

```js
WebViewer(...)
.then(instance => {
  const { docViewer, annotManager } = instance;

  docViewer.on('documentLoaded', () => {
    docViewer.getAnnotationsLoadedPromise().then(() => {
      const fieldManager = annotManager.getFieldManager();
      const field = fieldManager.getField(fieldId);
      field.setValue('new value');
    });
  });
});
```

{% endcode %}

[AnnotationManager#fieldChanged](https://sdk.apryse.com/api/web/Core.AnnotationManager.html#event:fieldChanged__anchor)
{% endtab %}
{% endtabs %}

## Listening for widget events

Interacting with widget annotations causes a number of [events](https://sdk.apryse.com/api/web/Core.Annotations.WidgetAnnotation.html#toc111__anchor) to be fired. The following sample demonstrates how to respond to the ‘focus’ event.

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

```js
WebViewer(...)
.then(instance => {
  const { documentViewer, annotationManager, Annotations } = instance.Core;

  const DEFAULT_VALUE = 'N/A';

  documentViewer.addEventListener('annotationsLoaded', () => {
    const textWidgets = annotationManager.getAnnotationsList().filter(annotation => annotation instanceof Annotations.TextWidgetAnnotation);
    textWidgets.forEach((widget) => {
      widget.addEventListener('focus', () => {
        if (!widget.getValue()) {
          widget.setValue(DEFAULT_VALUE);
          annotationManager.redrawAnnotation(widget);
        }
      });
    });
  });
});
```

{% endcode %}

[WidgetAnnotation#events](https://sdk.apryse.com/api/web/Core.Annotations.WidgetAnnotation.html#toc111__anchor) [WidgetAnnotation.setValue](https://sdk.apryse.com/api/web/Core.Annotations.WidgetAnnotation.html#setValue__anchor) [DocumentViewer#annotationsLoaded](https://sdk.apryse.com/api/web/Core.DocumentViewer.html#event:annotationsLoaded__anchor)
{% endtab %}

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

```js
WebViewer(...)
.then(instance => {
  const { docViewer, annotManager } = instance;
  const DEFAULT_VALUE = 'N/A';

  docViewer.on('documentLoaded', () => {
    docViewer.getAnnotationsLoadedPromise().then(() => {
      const textWidgets = annotManager.getAnnotationsList().filter(annotation => annotation instanceof Annotations.TextWidgetAnnotation);
      textWidgets.forEach((widget) => {
        widget.addEventListener('focus', () => {
          if (!widget.getValue()) {
            widget.setValue(DEFAULT_VALUE);
            annotManager.redrawAnnotation(widget);
          }
        });
      });
    });
  });
});
```

{% endcode %}

[AnnotationManager#fieldChanged](https://sdk.apryse.com/api/web/Core.AnnotationManager.html#event:fieldChanged__anchor)
{% endtab %}
{% endtabs %}

## Filling field values

You can access and fill any form field by its field name. The following sample demonstrates how to get a field by its name and set a new value.

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

```js
WebViewer(...)
.then(instance => {
  const { documentViewer, annotationManager } = instance.Core;

  documentViewer.addEventListener('annotationsLoaded', () => {
    const fieldManager = annotationManager.getFieldManager();
    const fieldName = ''; // Add field name here.
    const field = fieldManager.getField(fieldName);
    if (field) {
      field.setValue('new value');
    }
  });
});
```

{% endcode %}

[DocumentViewer#documentLoaded](https://sdk.apryse.com/api/web/Core.DocumentViewer.html#event:documentLoaded__anchor) [AnnotationManager.getFieldManager](https://sdk.apryse.com/api/web/Core.AnnotationManager.html#getFieldManager__anchor) [FieldManager.getField](https://sdk.apryse.com/api/web/Core.Annotations.Forms.FieldManager.html#getField__anchor) [FieldManager.setValue](https://sdk.apryse.com/api/web/Core.Annotations.Forms.Field.html#setValue__anchor)
{% endtab %}

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

```js
WebViewer(...)
.then(instance => {
  const { docViewer, annotManager } = instance;

  docViewer.on('documentLoaded', () => {
    docViewer.getAnnotationsLoadedPromise().then(() => {
      const fieldManager = annotManager.getFieldManager();
      const fieldName = ''; // Add field name here.
      const field = fieldManager.getField(fieldName);
      if (field) {
        field.setValue('new value');
      }
    });
  });
});
```

{% endcode %}

[DocumentViewer.getAnnotationsLoadedPromise](https://sdk.apryse.com/api/web/Core.DocumentViewer.html#getAnnotationsLoadedPromise__anchor) [DocumentViewer#documentLoaded](https://sdk.apryse.com/api/web/Core.DocumentViewer.html#event:documentLoaded__anchor) [AnnotationManager.getFieldManager](https://sdk.apryse.com/api/web/Core.AnnotationManager.html#getFieldManager__anchor) [FieldManager.getField](https://sdk.apryse.com/api/web/Core.Annotations.Forms.FieldManager.html#getField__anchor) [FieldManager.setValue](https://sdk.apryse.com/api/web/Core.Annotations.Forms.Field.html#setValue__anchor)
{% endtab %}
{% endtabs %}

## Listening for field changes

The [fieldChanged](https://sdk.apryse.com/api/web/Core.AnnotationManager.html#event:fieldChanged__anchor) event is fired any time the value of a form field changes. The following sample shows how to listen to the event and log the changed field's name and value.

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

```js
WebViewer(...)
.then(instance => {
  const { annotationManager } = instance.Core;

  annotationManager.addEventListener('fieldChanged', (field, value) => {
    console.log(`Field changed: ${field.name}, ${value}`);
  });
});
```

{% endcode %}

[AnnotationManager#fieldChanged](https://sdk.apryse.com/api/web/Core.AnnotationManager.html#event:fieldChanged__anchor)
{% endtab %}

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

```js
WebViewer(...)
.then(instance => {
  const { annotManager } = instance;

  annotManager.on('fieldChanged', (field, value) => {
    console.log(`Field changed: ${field.name}, ${value}`);
  });
});
```

{% endcode %}

[AnnotationManager#fieldChanged](https://sdk.apryse.com/api/web/Core.AnnotationManager.html#event:fieldChanged__anchor)
{% endtab %}
{% endtabs %}


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