Highlight Compensated Reviews on Amazon.com

highlightCompensatedAmazonReviews.js

// Amazon pages seem to intermittently have jQuery loaded.
if (!window.jQuery) {
	var jqlib = document.createElement('script');
	jqlib.setAttribute('type', 'text/javascript');
	jqlib.setAttribute('src','//ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js');
	document.head.appendChild(jqlib);
}

// Make sure jQuery before executing.
function defer(method) {
    if (window.jQuery)
        method();
    else
        setTimeout(function() { defer(method) }, 50);
}

// Highlights specific terms found in reviews.
// Add or remove terms from the 'search_terms' array.
// Update review selectors in the 'search_range' jQuery object.
highlightCompensatedReviews = function(){
	var d = document;
	var $ = jQuery;
	// Verify we are on Amazon.
	var domain = window.location.host;
	var domain_parts = domain.split('.');

	if(domain_parts[domain_parts.length - 1] != 'com' || domain_parts[domain_parts.length - 2] != 'amazon'){
		console.log("This is not Amazon. Exiting.");
		return; //GTFO
	}

	// Else, carry on.
	$(d).ready(function()
	{
		// Terms to mark
		var search_terms = [
			'unbiased',
			'discount in exchange',
			'in exchange for',
			'discounted price',
			'for my honest review',
			'for an honest review'
		];

		// Places to search for the search_terms
		var search_range = $('#revMHRL [class="a-section"]')  // Product Page - Main	   - Most Helpful Customer Reviews
			.add('#revMRRL [class="a-row a-spacing-base"]')   // Product Page - Sidebar - Most Recent Customer Reviews
			.add('#cm_cr-review_list .review-text')           // Review Page  - Main
			.add($('.view-point-review .a-size-base').parent());  // Review Page  - Main
			// Add more sections to search as they are found.

		// For each review.
		search_range.each(function(index, el) {
			var text = $(el).html();

			// For each search term
			for (var i = 0; i < search_terms.length; i++) {
				text = text.replace(search_terms[i], '<mark class="compensation-term">' + search_terms[i] + '</mark>');
			}

			$(el).html(text);
		});

		// Modify styles for marked search terms.
		$('.compensation-term').css({
			'padding': '1px 2px'
		});

		// Modify styles for reviews containing marked search terms.
		var biased_reviews = search_range.has('.compensation-term');

		biased_reviews.css({
			'background-color': 'rgba(255, 127, 80, 0.15)',
			'opacity': '0.55'
		});

	});

};

defer(highlightCompensatedReviews);