When you change the QRA field in the QSO input, it will check gridsquare and return whether worked or not based on SAT or if sat_name isn't filled out it will do band/mode

application/controllers/Logbook.php

@@ -161,6 +161,38 @@ class Logbook extends CI_Controller {
 		return false;
 	}
 
+	/*
+	*	Function: jsonlookupgrid
+	*
+	* 	Usage: Used to look up gridsquares when creating a QSO to check whether its needed or not 
+	*/
+	function jsonlookupgrid($gridsquare, $type, $band, $mode) {
+		$return = [
+			"workedBefore" => false,
+		];
+
+		if($type == "SAT") {
+			$this->db->where('COL_PROP_MODE', 'SAT'); 
+		} else {
+			$this->db->where('COL_MODE', $mode); 
+			$this->db->where('COL_BAND', $band); 
+			$this->db->where('COL_PROP_MODE !=','SAT');
+
+		}
+
+		$this->db->like('SUBSTRING(COL_GRIDSQUARE, 1, 4)', substr($gridsquare, 0, 4));
+		$query = $this->db->get($this->config->item('table_name'), 1, 0);
+		foreach ($query->result() as $workedBeforeRow)
+		{
+			$return['workedBefore'] = true;
+		}
+
+		header('Content-Type: application/json');
+		echo json_encode($return, JSON_PRETTY_PRINT);
+
+		return;
+	}
+
 
 	/* Used to generate maps for displaying on /logbook/ */
 	function qso_map() {

application/views/interface_assets/footer.php

@@ -384,7 +384,56 @@ $(document).ready(function(){
       if ($(this).val()) {
         var qra_input = $(this).val();
 
-        if(qra_input.length > 3) {
+        var qra_lookup = qra_input.substring(0, 4);
+
+        if(qra_lookup.length >= 4) {
+          
+          // Check Log if satname is provided
+          if($("#sat_name" ).val() != "") {
+
+            //logbook/jsonlookupgrid/io77/SAT/0/0
+
+            $.getJSON('logbook/jsonlookupgrid/' + qra_lookup.toUpperCase() + '/SAT/0/0', function(result)
+            {
+              // Reset CSS values before updating
+              $('#locator').removeClass("workedGrid");
+              $('#locator').removeClass("newGrid");
+              $('#locator').attr('title', '');
+
+              if (result.workedBefore)
+              {
+                $('#locator').addClass("workedGrid");
+                $('#locator').attr('title', 'Grid was already worked in the past');
+              }
+              else
+              {
+                $('#locator').addClass("newGrid");
+                $('#locator').attr('title', 'New grid!');
+              }
+            })
+          } else {
+            $.getJSON('logbook/jsonlookupgrid/' + qra_lookup.toUpperCase() + '/0/' + $("#band").val() +'/' + $("#mode").val(), function(result)
+            {
+              // Reset CSS values before updating
+              $('#locator').removeClass("workedGrid");
+              $('#locator').removeClass("newGrid");
+              $('#locator').attr('title', '');
+
+              if (result.workedBefore)
+              {
+                $('#locator').addClass("workedGrid");
+                $('#locator').attr('title', 'Grid was already worked in the past');
+              }
+              else
+              {
+                $('#locator').addClass("newGrid");
+                $('#locator').attr('title', 'New grid!');
+              }
+            })
+          }
+        }
+
+        if(qra_input.length >= 4) {
           $.getJSON('logbook/qralatlngjson/' + $(this).val(), function(result)
           {
             // Set Map to Lat/Long