Ajax提前打字不起作用

我在一个json对象中从雅虎金融中提取股票符号,并试图在用户开始在搜索框中键入公司名称或符号时将其显示为下拉菜单。

Typeahead不能作为搜索框中的下拉菜单。这是我目前掌握的代码。

例如,如果我在suggest.php中转储$data或$result,同时用goog替换{$_POST['symbol']},我将返回一个数组。因此,我认为suggest.php echo没有返回任何内容,或者suggestphp没有从quote.js文件中调用。

如果我删除suggest.php中的If语句,并用goog替换{$_POST['symbol']},然后转到 http://localhost/suggest.php echo不应该打印一些东西吗?

任何帮助都将不胜感激。我是网络开发的新手,正在努力学习。

报价.js

$(document).ready(function() {

  // create autocomplete
  $('#form-quote input[name=symbol]').typeahead({

      // load autocomplete data from suggest.php
      source: function(query, callback) {
          $.ajax({
              url: '../suggest.php',
              type: 'POST',
              dataType: 'json',
              data: {
                  symbol: query
              },
              success: function(response) {
                  callback(response.symbols);

              }
          });
      }
  });

  // load data via ajax when form is submitted
  $('#form-quote').on('click', function() {

      // determine symbol
      var symbol = $('#form-quote input[name=symbol]').val();

      // send request to quote.php
      $.ajax({
          url: 'quote.php',
          type: 'POST',
          data: {
              symbol: symbol
          },
          success: function(response) {
              $('#price').text(response);
          }
      });


      return false;
  });

});

报价.php

<?php

//configuration
require("../includes/config.php");

//if form was submitted 

if($_SERVER["REQUEST_METHOD"] == "POST"){

    $stock = lookup(strtoupper($_POST["symbol"]));

    if(empty($_POST["symbol"])){

        //echo "You must enter a stock symbol";

    }else if($_POST["symbol"]){

    $price = number_format($stock['price'], 2);

    echo "A share of {$stock['name']} costs $$price";
    }
}

else{

    // render portfolio
render("stock_search.php", ["title" => "Get Quote"]);
}   
?>

报价搜索.php

<form id = "form-quote" action="quote.php" method="post">
<fieldset>     
    <div class="control-group">
        <input name="symbol" autofocus autocomplete="off"  placeholder="Symbol"  type="text"/>
    </div>

    <div class="control-group">
        <button type="submit" class="btn">Get Quote</button>
    </div>

</fieldset>
<div id="price"></div>
<div id="suggestions"></div> 
</form>
<script type="text/javascript" src="js/quote.js" ></script>

建议.php

 <?php

// configuration
require("../includes/functions.php");

// if form was submitted
if ($_SERVER["REQUEST_METHOD"] == "POST")
{
    // load suggestion data
$data = @file_get_contents("http://d.yimg.com/aq/autoc?query=  {$_POST['symbol']}&region=US&lang=en-US&callback=YAHOO.util.ScriptNodeDataSource.callbacks");

    // parse yahoo data into a list of symbols
$result = array();
    $json = json_decode(substr($data, strlen('YAHOO.util.ScriptNodeDataSource.callbacks('), -1));
    foreach ($json->ResultSet->Result as $stock)
        $result[] = $stock;

    echo json_encode(array('symbols' => $result]));
}

?>