[Solved] Javascript ajax don’t work
First callback is not defined and second you also need to call get_lan() function to get it work Updated code function get_lan() { var lan_code = document.getElementById(‘customDropdown1′).value; var params = “lan=” + lan_code; $.ajax({ type: “POST”, url: “api/get_lan.php”, data: params, success: function(result) { document.getElementById(“lan_code”).innerHTML = result; } }); } get_lan(); solved Javascript ajax don’t work