如何使用JSON连接到外部API？

Question

我写了PHP和AJAX已经有一段时间了。所以请耐心等待。

我想使用AltosResearch的API的首页上市历史图表/合成。 API文档位于：https://docs.google.com/document/pub?id=1hHPmUEuV5ekqXTLN8RcEOyzhiBLZSz2eFUuV1_Mu7fg#h.fc47gnpln3dt

用户将以提供的形式输入家庭住址。 ajax请求将从AltosResearch获取JSON信息。 然后将提供历史信息和家庭比较。但是我没有从Altos获得任何信息。我知道我无法使用JSONP，因为我正在连接到外部主机。所以我用curl来检索信息。我在这里做错了什么？

请帮忙。谢谢。

从图斯JSON响应的格式如下：

{ 
    "list": [ 
     { 
      "unit_number": "", 
      "property_id": "a08373408624b1570ff6aafb77498308", 
      "baths": "1.00", 
      "zip": "94086", 
      "geocode_accuracy": "", 
      "residence_sqft": "765", 
      "year_built": "1942", 
      "street_name": "CALIFORNIA", 
      "state": "CA", 
      "lot_sqft": "4900", 
      "data_capture_date": "2011-08-26", 
      "city": "SUNNYVALE", 
      "days_on_market": "", 
      "price": "388000", 
      "beds": "2.00", 
      "street_address_raw": "800 E CALIFORNIA AV", 
      "street_direction": "EAST", 
      "longitude": "", 
      "street_number": "800", 
      "latitude": "", 
      "listing_entry_id": "caf478d031f90abd0131fe7caff77ea7", 
      "residence_type": "single_family", 
      "street_type": "AVENUE" 
     } 
    ], 
    "responseCode": 200, 
    "apiVersion": 1 
} 

这里是我的JS文件：

<script src="http://code.jquery.com/jquery-1.7.1.min.js"></script> 
    <script> 
    $(document).ready(function(){ 

     $("#altos").on('submit', function(event) { 

     function errorFunction() { 
      document.getElementById('result').innerHTML = "There was an error with JSON's callback function!"; 
     } 

     // Request the JSON and process it 
     $.ajax({ 
      type: 'GET', 
      dataType: 'json', 
      async: true, 
      url: 'http://data.altosresearch.com/altos/app', 
      success: function(data) { 
      console.log(data); 
      document.getElementById("result").innerHTML= "Property IDs: " + data.list[0].property_id + data.list[0].listing_entry_id; 
      }, 
      error: function() { 
      errorFunction(); 
      } 
     }); 

     return false; 
     event.preventDefault(); 

     }); 

    }); 
    </script> 

这是我的PHP文件：

// Using GET 
    $c = curl_init(); 
    curl_setopt($c, CURLOPT_URL, "http://data.altosresearch.com/altos/app"); 
    curl_setopt($c, CURLOPT_HEADER, false); 
    curl_setopt($c, CURLOPT_RETURNTRANSFER, true); 
    $page_data = curl_exec($c); 
    curl_close($c); 

    // Access data with GET or POST via retrieve_page fun 
    function retrieve_page($url, $post_parameters = null) { 
    // Connect and fetches data 
    $query_string = null; 
    if(!is_null($post_parameters)) { 
     if(!is_array($post_parameters)) { 
     die("Form parameters need to be in an array format"); 
     } 
    } 
    // Build query string 
    $query_string = http_build_query($post_parameters); 
    } 


    // Configure connection to use query string as POST data 
    $ch = curl_init(); 

    if ($query_string) { 
    curl_setopt($ch, CURLOPT_POST, true); 
    curl_setopt($ch, CURLOPT_POSTFIELDS, $query_string); 
    curl_setopt($ch, CURLOPT_URL, $url); 
    curl_setopt($ch, CURLOPT_HEADER, false); 
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
    $return_data = curl_exec($ch); 
    curl_close($ch); 
    return $return_data; 
    } 

    // Extract params from the form 
    $qs = http_build_query(array(
    "pai"  => "755110180", 
    "apiv"  => "1", 
    "service" => "listinghistory", 
    "st"  => $_REQUEST["st"], 
    "c"   => $_REQUEST["c"], 
    "z"   => $_REQUEST["z"], 
    "addr"  => $_REQUEST["addr"] 
)); 

    if(isset($_GET['st'], $_GET['c'], $_GET['z'], $_GET['addr'])) { 

    $pai = $_GET['pai']; 
    $apiv = $_GET['apiv']; 
    $service = $_GET['service']; 
    $st = $_GET['st']; 
    $c = $_GET['c']; 
    $z = $_GET['z']; 
    $addr = $_GET['addr']; 

    $qs['pai'] = $pai; 
    $qs['apiv'] = $apiv; 
    $qs['service'] = $service; 
    $qs['st'] = $st; 
    $qs['c'] = $c; 
    $qs['z'] = $z; 
    $qs['addr'] = $addr; 
    } 

    header('Content-type: application/json'); 
    echo json_encode($qs); 

    $page = retrieve_page("http://data.altosresearch.com/altos/app?$qs"); 
    echo ("<hr>page info: " . $page . ".<hr>"); 

谢谢

Answer 1

url: 'http://data.altosresearch.com/altos/app', 

您试图直接从altosresearch而不是从您的PHP程序请求数据，所以您仍然受到同源策略的约束。