Free text annotation

18 Jan 202311 minutes to read

The PDF Viewer control provides the options to add, edit, and delete the free text annotations.

Adding a free text annotation to the PDF document

The Free text annotations can be added to the PDF document using the annotation toolbar.

  • Click the Edit Annotation button in the PDF Viewer toolbar. A toolbar appears below it.
  • Select the Free Text Annotation button in the annotation toolbar. It enables the Free Text annotation mode.
  • You can add the text over the pages of the PDF document.

In the pan mode, if the free text annotation mode is entered, the PDF Viewer control will switch to text select mode.

FreeTextAnnotation in Angular PDF Viewer

Refer to the following code sample to switch to the Free Text annotation mode using a button click.

<button (click)="addFreeTextAnnotation()">FreeText</button>

<ejs-pdfviewer id="pdfViewer"
               [serviceUrl]='service'
               [documentPath]='document'
               style="height:640px;display:block">
</ejs-pdfviewer>

//Event triggers while clicking the FreeText button.  
addFreeTextAnnotation() {
  var pdfviewer = (<any>document.getElementById("pdfViewer")).ej2_instances[0];
  //API to set FreeText annotation  
  pdfviewer.annotationModule.setAnnotationMode("FreeText");
}

How to clear the selection focus from free text annotation

The free text annotations selection focus can be cleared by using the setAnnotationMode property of the annotationModule.

Refer to the following code sample to remove the selection focus from the annotation by using a button click.

<button (click)="RemoveSelection()">RemoveSelection</button>

<ejs-pdfviewer id="pdfViewer"
               [serviceUrl]='service'
               [documentPath]='document'
               style="height:640px;display:block">
</ejs-pdfviewer>

//Event triggers while clicking the RemoveSelection button.
RemoveSelection() {
  var pdfviewer = (<any>document.getElementById('pdfViewer')).ej2_instances[0];
  //API to remove the selection from the free text annotation.  
  pdfviewer.annotationModule.setAnnotationMode('None');
}

View sample in GitHub

Editing the properties of free text annotation

The font family, font size, font styles, font color, text alignment, fill color, the border stroke color, border thickness, and opacity of the free text annotation can be edited using the Font Family tool, Font Size tool, Font Color tool, Text Align tool, Font Style tool Edit Color tool, Edit Stroke Color tool, Edit Thickness tool, and Edit Opacity tool in the annotation toolbar.

Editing font family

The font family of the annotation can be edited by selecting the desired font in the Font Family tool.

FontFamily

Editing font size

The font size of the annotation can be edited by selecting the desired size in the Font Size tool.

FontSize

Editing font color

The font color of the annotation can be edited using the color palette provided in the Font Color tool.

FontColor

Editing the text alignment

The text in the annotation can be aligned by selecting the desired styles in the drop-down pop-up in the Text Align tool.

FreeTextAnnotation

Editing text styles

The style of the text in the annotation can be edited by selecting the desired styles in the drop-down pop-up in the Font Style tool.

FontStyle

Editing fill color

The fill color of the annotation can be edited using the color palette provided in the Edit Color tool.

FillColor

Editing stroke color

The stroke color of the annotation can be edited using the color palette provided in the Edit Stroke Color tool.

StrokeColor

Editing thickness

The border thickness of the annotation can be edited using the range slider provided in the Edit Thickness tool.

FontThickness

Editing opacity

The opacity of the annotation can be edited using the range slider provided in the Edit Opacity tool.

FontOpacity

Move the free text annotation programmatically

The PDF Viewer library allows you to move the free text annotation in the PDF Viewer control programmatically using the editAnnotation() method.

Here is an example of how you can use the editAnnotation() method to move the free text annotation programmatically:

 <button (click)="moveFreeText()">Move the Free Text</button>
  moveFreeText() {
    var viewer = (<any>document.getElementById('pdfViewer')).ej2_instances[0];
    for (let i = 0; i < viewer.annotationCollection.length; i++) 
    {
      if (viewer.annotationCollection[i].subject === "Text Box") {
        var width = viewer.annotationCollection[i].bounds.width;
        var height = viewer.annotationCollection[i].bounds.height;
        viewer.annotationCollection[i].bounds = {x : 100, y: 100, width: width, height: height }; 
        viewer.annotation.editAnnotation(viewer.annotationCollection[i]);
      }
    }
  }

Find the sample how to move the free text annotation programmatically

Get the newly added free text annotation ID

To get the ID of a newly added free text annotation in the Syncfusion PDF viewer, you can use the annotationAdd() event. This event is triggered whenever a new annotation is added to the PDF document, and it provides the annotationAddEventHandler object as a parameter. You can access the ID of the new annotation through the AnnotationID property of the annotationAddEventHandler object.

Here is an example of how you can use the annotationAdd() event to get the ID of a new free text annotation:

public annotationAddEventHandler(args) {
  if (args.annotationType === 'FreeText') {
    console.log('annotationId:' + args.annotationId);
  }
}

Find the sample how to get the newly added free text annotation id

Change the content of an existing Free text annotation programmatically

To change the content of an existing free text annotation in the Syncfusion PDF viewer programmatically, you can use the editAnnotation() method.

Here is an example of how you can use the editAnnotation() method to change the content of a free text annotation:

 <button (click)="changeContent()">Change Contect</button>
changeContent() {
  var viewer = (<any>document.getElementById('pdfViewer')).ej2_instances[0];
  for (let i = 0; i < viewer.annotationCollection.length; i++) {
    if (viewer.annotationCollection[i].subject === 'Text Box') {
      viewer.annotationCollection[i].dynamicText = 'syncfusion';
      viewer.annotation.editAnnotation(viewer.annotationCollection[i]);
    }
  }
}

Find the sample how to change the content of an existing free text annotation programmatically

Setting default properties during control initialization

The properties of the free text annotation can be set before creating the control using the FreeTextSettings.

After editing the default values, they will be changed to the selected values.
Refer to the following code sample to set the default free text annotation settings.

import { ViewChild } from '@angular/core';
import { Component, OnInit } from '@angular/core';
import { PdfViewerComponent, LinkAnnotationService, BookmarkViewService,
         MagnificationService, ThumbnailViewService, ToolbarService,
         NavigationService, TextSearchService, TextSelectionService,
         PrintService, AnnotationService
       } from '@syncfusion/ej2-angular-pdfviewer';
@Component({
  selector: 'app-root',
  // Specifies the template string for the PDF Viewer component.
  template: `<div class="content-wrapper">
                <ejs-pdfviewer id="pdfViewer"
                      [serviceUrl]='service'
                      [documentPath]='document'
                      [freeTextSettings]='freeTextSettings'
                      style="height:640px;display:block">
                </ejs-pdfviewer>
              </div>`,
  providers: [ LinkAnnotationService, BookmarkViewService, MagnificationService,
               ThumbnailViewService, ToolbarService, NavigationService,
               TextSearchService, TextSelectionService, PrintService,
               AnnotationService]
  })
  export class AppComponent implements OnInit {
    @ViewChild('pdfviewer')
    public pdfviewerControl: PdfViewerComponent;
    public service: string = 'https://ej2services.syncfusion.com/production/web-services/api/pdfviewer';
    public document: string = 'PDF_Succinctly.pdf';
    public freeTextSettings = { fillColor: 'green', borderColor: 'blue', fontColor: 'yellow' };
  }

You can also enable the autofit support for free text annotation by using the enableAutoFit boolean property in freeTextSettings as below. The width of the free text rectangle box will be increased based on the text added to it.

import { ViewChild } from '@angular/core';
import { Component, OnInit } from '@angular/core';
import { PdfViewerComponent, LinkAnnotationService, BookmarkViewService,
         MagnificationService, ThumbnailViewService, ToolbarService,
         NavigationService, TextSearchService, TextSelectionService,
         PrintService, AnnotationService
       } from '@syncfusion/ej2-angular-pdfviewer';
@Component({
  selector: 'app-root',
  // Specify the template string for the PDF Viewer component.
  template: `<div class="content-wrapper">
                <ejs-pdfviewer id="pdfViewer"
                      [serviceUrl]='service'
                      [documentPath]='document'
                      [freeTextSettings]='freeTextSettings'
                      style="height:640px;display:block">
                </ejs-pdfviewer>
              </div>`,
  providers: [ LinkAnnotationService, BookmarkViewService, MagnificationService,
               ThumbnailViewService, ToolbarService, NavigationService,
               TextSearchService, TextSelectionService, PrintService,
               AnnotationService ]
})
  export class AppComponent implements OnInit {
      @ViewChild('pdfviewer')
      public pdfviewerControl: PdfViewerComponent;
      public service: string = 'https://ej2services.syncfusion.com/production/web-services/api/pdfviewer';
      public document: string = 'PDF_Succinctly.pdf';
      public freeTextSettings = { enableAutoFit: true };
      }

View sample in GitHub