Closes #6432: Bail out from beacon conditions (#6555)

assets/js/lcp-beacon.js

@@ -152,6 +152,47 @@ function getElementInfo(element) {
 let performance_images = [];
 
 function main() {
+
+	// AJAX call to check if there are any records for the current URL
+	let data_check = new FormData();
+	data_check.append('action', 'rocket_check_lcp');
+	data_check.append('rocket_lcp_nonce', rocket_lcp_data.nonce);
+	data_check.append('url', rocket_lcp_data.url);
+	data_check.append('is_mobile', rocket_lcp_data.is_mobile);
+
+	const response = fetch(rocket_lcp_data.ajax_url, {
+		method: "POST",
+		credentials: 'same-origin',
+		body: data_check
+	});
+
+	if ( true === lcp_data.success ) {
+		console.log('Bailing out because data is already available');
+		return;
+	}
+
+	// Check screen size
+	const screenWidth = window.innerWidth || document.documentElement.clientWidth;
+	const screenHeight = window.innerHeight || document.documentElement.clientHeight;
+	if ( ( rocket_lcp_data.is_mobile && ( screenWidth > rocket_lcp_data.width_threshold || screenHeight > rocket_lcp_data.height_threshold ) ) ||
+		( ! rocket_lcp_data.is_mobile && ( screenWidth < rocket_lcp_data.width_threshold || screenHeight < rocket_lcp_data.height_threshold ) ) )
+	{
+		console.log('Bailing out because screen size is not acceptable');
+		return;
+	}
+
+	// Filter the array based on the condition imageURL is not null
+	const filteredArray = LCPCandidates(1)
+	if (filteredArray.length !== 0) {
+		console.log("Estimated LCP element:", filteredArray);
+		performance_images = filteredArray.map((item) => ({
+			src: item.imageURL,
+			label: "lcp",
+		}));
+	} else {
+		console.log("No LCP candidate found.");
+	}
+
 	// Use LCPCandidates function to get all the elements in the viewport
 	const above_the_fold_images = LCPCandidates(Infinity);