在没有JQuery的情况下通过Ajax / JSON发送数组

Question

I'm experimenting with Ajax and am trying to send a 1-dimensional, non associative array from a PHP function to a calling javascript function. The array is simple stuff like:

$arr[0] = 1900-1905
$arr[1] = 1905-1911

etc. For various reasons I'm using jQuery, but I am reasonably familiar with the raw Javascript way of using Ajax but I can't seem to find a way how to process the JSON data client side using Javascript. I'm going to be calling the PHP function using a call to something like

myserver.com/myfunction.php?var1=1&var2=2&var3=3

and I know you have to use echo json_encode($arr) in the PHP function, but what do you do in the Ajax method to convert the JSON back into an array, and access the array elements? From reading some of the answers on this forum, this is the part where people fall at the hurdle.

Many thanks.

Answer 1

Try This

function callAjax()
{
var xmlhttp;
if (window.XMLHttpRequest)
  {
  xmlhttp=new XMLHttpRequest();
  }
else
  {
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200) //Success
    {
        var objResponse = JSON.parse(xmlhttp.responseText); //JSON.parse Parses a string as JSON
        console.log(objResponse[0]); //1900-1905
    }
  }
xmlhttp.open("GET","myserver.com/myfunction.php?var1=1&var2=2&var3=3",true);
xmlhttp.send();
}