load all options of a select with jquery

//If you're drawing the data from an array within the object (in this case, an array identified by the property options on the resulting object):

//JSON:

{
  "optionsValues": [
    {"value": "New1", "text": "New Option 1"},
    {"value": "New2", "text": "New Option 2"},
    {"value": "New3", "text": "New Option 3"}
  ]
}

//JavaScript:

$.ajax({
  url: "http://jsbin.com/apici3",
  dataType: "json",
  success: function(data) {
    var options, index, select, option;

    // Get the raw DOM object for the select box
    select = document.getElementById('theSelect');

    // Clear the old options
    select.options.length = 0;

    // Load the new options
    options = data.optionsValues; // Or whatever source information you're working with
    for (index = 0; index < options.length; ++index) {
      option = options[index];
      select.options.add(new Option(option.text, option.value));
    }
  }
});