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Measurement

Set up measurement tools

When creating a new instance of PDF.js Express, the enableMeasurement property needs to be set to true to display the measurement annotation tools in the UI.

WebViewer({
  ... // other options
  enableMeasurement: true
}, viewerElement);

Besides passing in a constructor option, measurement can be toggled using the PDF.js Express API with the enableMeasurement and disableMeasurement functions.

WebViewer({
  ... // other options
}, viewerElement)
  .then(function(instance) {
    instance.enableMeasurement();
  });