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// For complete examples and data files, please go to https://github.com/groupdocs-viewer/GroupDocs.Viewer-for-.NET
// get layer
var layer = $("[data-pdflayer='Background'|data-pdflayer='Background']");

// hide layer
layer.hide();

// show layer
layer.show();

// get all layers
var allLayers = $("[data-pdflayer|data-pdflayer]");

// go throught all layers and print layer name
allLayers.each(function(index){ console.log(index + ": " + $(this).data("pdflayer")); });