PDF.js get/show hightlight

gistfile1.js

	var id_count = 1;

	function HighlightSelectedText()
	{
		var pageIndex = window.PDFViewerApplication.pdfViewer.currentPageNumber - 1;
		var page = window.PDFViewerApplication.pdfViewer.getPageView(pageIndex);
		var pageElement = page.canvas.parentNode.nextSibling;
		var pageRect = page.canvas.getClientRects()[0];
		var selection = window.getSelection();

		if(selection.rangeCount > 0)
		{
			var selectionRects = selection.getRangeAt(0).getClientRects();
			var viewport = page.viewport;
			var i = 0;
			var selected = $.map(selectionRects, function(r){

				var rect = viewport.convertToPdfPoint(r.left - pageRect.left, r.top - pageRect.top).concat(viewport.convertToPdfPoint(r.right - pageRect.left, r.bottom - pageRect.top));
				var bounds = viewport.convertToViewportRectangle(rect);

				if(!window.chrome || i % 2 == 0)
				{
					var el = document.createElement('div');

					el.setAttribute('style', 'position: absolute;background-color:red;' +
					'left:' + Math.min(bounds[0], bounds[2]) + 'px; top:' + Math.min(bounds[1], bounds[3]) + 'px;' +
					'width:' + Math.abs(bounds[0] - bounds[2]) + 'px; height:' + Math.abs(bounds[1] - bounds[3]) + 'px;');
					el.className = 'hlight group_' + id_count;
					pageElement.appendChild(el);
				}

				i++;
			});

			id_count++;
			window.getSelection().removeAllRanges();
		}
	}