The PDF Viewer library allows you to highlight, underline and strikeout text in the loaded PDF document programmatically using the setAnnotationMode() method.
Step 1: Follow the steps provided in the link to create simple PDF Viewer sample.
Step 2: Add the following code snippet to highlight, underline, and strikeout text in index.ts file with button click events.
document.getElementById('setHighlight').addEventListener('click', ()=> {
viewer.annotation.setAnnotationMode('Highlight');
});
document.getElementById('setUnderline').addEventListener('click', ()=> {
viewer.annotation.setAnnotationMode('Underline');
});
document.getElementById('setStrikeout').addEventListener('click', ()=> {
viewer.annotation.setAnnotationMode('Strikethrough');
});
document.getElementById('setNone').addEventListener('click', ()=> {
viewer.annotation.setAnnotationMode('None');
});Find the Sample how to highlight, underline and strikeout text programmatically