First you include jQuery Lib. File in Your Page….
in following example #latitude and #longitude are Ids of HTML elements where we want to display them
var address='B-56+Sector-64+Noida+up+india';//address which you want Longitude and Latitude
jQuery.ajax({
type: "GET",
dataType: "json",
url: "https://maps.googleapis.com/maps/api/geocode/json?key=set_your_api_key",
data: {'address': address,'sensor':false},
success: function(data){
if(data.results.length){
jQuery('#latitude').val(data.results[0].geometry.location.lat);
jQuery('#longitude').val(data.results[0].geometry.location.lng);
}else{
jQuery('#latitude').val('invalid address');
jQuery('#longitude').val('invalid address');
}
}
});

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