how to get data to javascript from php using json_encode?

Question

I am trying to map traceroutes to google maps.

I have an array in php with traceroute data as

$c=ip,latitude,longitude, 2nd ip, its latitude, longitu         


        

Answer 1

HTML

PHP

$this->load->model('MainModel');
$subvalue = $this->MainModel->loadSubData($var);
echo json_encode($subvalue);
//if MVC
// or you can just output your SQLi data to json_encode()

JS

$("#maincat").change(function(){
  var status = this.value;

  $.ajax({
    type: 'POST',
    url: 'home/subcat/'+status,
    success: function(data){
        var option = '';
        var obj = JSON.parse(data);
        if(obj.length > 0){
            for (var i=0;i' + obj[i].name + '';  
            }
            //Now populate the second dropdown i.e "Sub Category"
            $('#subcat').children("option").remove();
            $('#subcat').append(option);
        }else{
            option = 'No Sub Category Found';
            $('#subcat').children("option").remove();
            $('#subcat').append(option);
        }       
    },
    error: function(){
    alert('failure');
    }
});