The recommended way is to use the setCustomData
function on annotations.
When the PDF is downloaded this data will also be embedded inside the PDF and if you re-open the PDF in WebViewer it will be accessible through the getCustomData
function.
Alternatively you can use the setCustomSerializeHandler
and setCustomDeserializeHandler
APIs, however note that saving an attribute this way will only work if you load XFDF separately from the PDF. If you download the PDF the attribute will not be preserved.
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