JavaScript Code:
var latitude = document.getElementById("<%=txt_Lat.ClientID %>").value;
var longitude = document.getElementById("<%=txt_Long.ClientID %>").value;
var jsonData = {latitude: latitude, longitude: longitude};
var jsonString = JSON.stringify(jsonData);
var centerPoint = new google.maps.LatLng(jsonData.latitude, jsonData.longitude);
What is the best way to transfer TextBox values as JSON using JavaScript?
After reviewing the documentation, it seems you're on the right track. You can avoid using the JSON.parse() method in this case, as text is already an object.
Additionally, make sure your object names are in lowercase and pass the values as numeric to the object:
var lat = parseInt(document.getElementById("<%=txt_Lat.ClientID %>").value);
var long = parseInt(document.getElementById("<%=txt_Long.ClientID %>").value);
var text = {lat: lat, lng: long};
var myCenter = new google.maps.LatLng(text);
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