将json对象从php分配到javascript有什么问题？ [英] What's wrong with this assignment of json object from php to javascript?

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问题描述

我需要将php json对象的值传递给javascript。这是我的操作方式；

I need to pass the value of a php json object to javascript. This is how I am doing it;

  <script type="text/javascript"> var msg_top = <?php echo searchResults('windows');?>;
  </script>

这是返回json的php SearchResults函数：

This is php SearchResults function that returns json: 

   function searchResults($q) {

      $host = "http://search.twitter.com/search.atom?q=" . urlencode( $q ) . "&rpp=100";
      $ch = curl_init();
      curl_setopt($ch, CURLOPT_URL, $host);
      curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);

    //Raw xml
      $result = curl_exec($ch);
      curl_close($ch);
      $xml = simplexml_load_string($result);
      return json_encode($xml);
      }

错误控制台中没有错误，但没有收到任何值。对于var_dump（$ _ POST），它的输出类似于array（0）{};
编辑
我在成功功能后添加了一个测试警报，它会打印出失败

There is no error in error console but there is no value received. It outputs like array(0) { } for var_dump($_POST); EDIT I added a test alert after success function and it prints out failure

这是脚本

  <head>
  <script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js">
  </script>
  </head>
  <body>
  <script type="text/javascript"> var msg_top = <?php echo searchResults('windows');?>;
  </script>
  <script type="text/javascript">
    $(document).ready(function() 
    {
       $.ajax({
       url: "script.php",
       type: "POST",
       dataType: "json",
       data: "msg_top",
       success: function(msg){
       alert("success");
     }
   });
   alert("failure");
  });
  </script>
  </body>
  </html>

这是来自Twitter的json

this is json from twitter

    <script type="text/javascript"> var test_json = {\"id\":\"tag:search.twitter.com,2005:search\\/#DIYSe_F\",\"link\":[{\"@attributes\":{\"type\":\"text\\/html\",\"href\":\"http:\\/\\/search.twitter.com\\/search?q=%23DIYSe_F\",\"rel\":\"alternate\"}},{\"@attributes\":{\"type\":\"application\\/atom+xml\",\"href\":\"http:\\/\\/search.twitter.com\\/search.atom?q=%23DIYSe_F&rpp=100\",\"rel\":\"self\"}},{\"@attributes\":{\"type\":\"application\\/opensearchdescription+xml\",\"href\":\"http:\\/\\/search.twitter.com\\/opensearch.xml\",\"rel\":\"search\"}},{\"@attributes\":{\"type\":\"application\\/atom+xml\",\"href\":\"http:\\/\\/search.twitter.com\\/search.atom?q=%23DIYSe_F&rpp=100&since_id=7750301532557312\",\"rel\":\"refresh\"}}],\"title\":\"#DIYSe_F - Twitter Search\",\"updated\":\"2010-11-24T22:20:44Z\",\"entry\":[{\"id\":\"tag:search.twitter.com,2005:7559269595488256\",\"published\":\"2010-11-24T22:20:44Z\",\"link\":[{\"@attributes\":{\"type\":\"text\\/html\",\"href\":\"http:\\/\\/twitter.com\\/_smir\\/statuses\\/7559269595488256\",\"rel\":\"alternate\"}},{\"@attributes\":{\"type\":\"image\\/png\",\"href\":\"http:\\/\\/s.twimg.com\\/a\\/1289849896\\/images\\/default_profile_5_normal.png\",\"rel\":
    \":\"image\"}}],\"title\":\"#DIYse_F HIE_STRUCT: HIERARCHICAL STRUCTURE: hierarchical structure to display \\nmessages of Functions and Qualities types\",\"content\":\"<a href=\\\"http:\\/\\/search.twitter.com\\/search?q=%23DIYse_F\\\" onclick=\\\"pageTracker._setCustomVar(2, \'result_type\', \'recent\', 3);pageTracker._trackPageview(\'\\/intra\\/hashtag\\/#DIYse_F\');\\\"><b>#DIYse_F<\\/b><\\/a> HIE_STRUCT: HIERARCHICAL STRUCTURE: hierarchical structure to display \\nmessages of Functions and Qualities types\",\"updated\":\"2010-11-24T22:20:44Z\",\"author\":{\"name\":\"_smir (Smeer)\",\"uri\":\"http:\\/\\/twitter.com\\/_smir\"}},{\"id\":\"tag:search.twitter.com,2005:7552659368189952\",\"published\":\"2010-11-24T21:54:28Z\",\"link\":[{\"@attributes\":{\"type\":\"text\\/html\",\"href\":\"http:\\/\\/twitter.com\\/_smir\\/statuses\\/7552659368189952\",\"rel\":\"alternate\"}},{\"@attributes\":{\"type\":\"image\\/png\",\"href\":\"http:\\/\\/s.twimg.com\\/a\\/1289849896\\/images\\/default_profile_5_normal.png\",\"rel\":\"image\"}}],\"title\":\"#DIYse_F SEND_MSG: users can send messages of four types i.e.  \\n\\nFunction,Quality,Solution, and delivery\",\"content\":\"<a href=\\\"http:\\/\\/search.twitter.com\\/search?q=%23DIYse_F\\\" onclick=\\\"pageTracker._setCustomVar(2, \'result_type\', \'recent\', 3);pageTracker._trackPageview(\'\\/intra
\\/hashtag\\/#DIYse_F\');\\\"><b>#DIYse_F<\\/b><\\/a> SEND_MSG: users can send messages of four types i.e.  \\n\\nFunction,Quality,Solution, and delivery\",\"updated\":\"2010-11-24T21:54:28Z\",\"author\":{\"name\":\"_smir (Smeer)\",\"uri\":\"http:\\/\\/twitter.com\\/_smir\"}},{\"id\":\"tag:search.twitter.com,2005:7548895705956352\",\"published\":\"2010-11-24T21:39:31Z\",\"link\":[{\"@attributes\":{\"type\":\"text\\/html\",\"href\":\"http:\\/\\/twitter.com\\/Babar_Shahzad\\/statuses\\/7548895705956352\",\"rel\":\"alternate\"}},{\"@attributes\":{\"type\":\"image\\/png\",\"href\":\"http:\\/\\/a1.twimg.com\\/profile_images\\/1090185625\\/29465_391454998679_533808679_3864564_6071800_n_normal.jpg\",\"rel\":\"image\"}}],\"title\":\"#DIYse_F READ_MSG: Users can read messages of all four types in  \\n\\ndifferent windows\",\"content\":\"<a href=\\\"http:\\/\\/search.twitter.com\\/search?q=%23DIYse_F\\\" onclick=\\\"pageTracker._setCustomVar(2, \'result_type\', \'recent\', 3);pageTracker._trackPageview(\'\\/intra\\/hashtag\\/#DIYse_F\');\\\"><b>#DIYse_F<\\/b><\\/a> READ_MSG: Users can read messages of all four types in  \\n\\ndifferent windows\",\"updated\":\"2010-11-24T21:39:31Z\",\"author\":{\"name\":\"Babar_Shahzad (Babar Shahzad Ch)\",\"uri\":\"http:\\/\\/twitter.com\\/Babar_Shahzad\"}}]};


推荐答案

如果使用 json_encode 将数据编码为JSON，输出将已经是有效的JavaScript表达式。因此，您无需将其用引号引起来。

If you use json_encode to encode the data as JSON, the output will already be a valid JavaScript expression. So you don’t need to put it into quotes.

实际上，应用<在其上使用href = http://php.net/addslashes rel = nofollow> addslashes 会将有效的JavaScript表达式转换为包含以下内容的字符串该JavaScript表达式：

In fact, applying addslashes on it will turn the valid JavaScript expression into a string containing that JavaScript expression:

$json = json_encode(array('foo'=>'bar'));
var_export($json);  // '{"foo":"bar"}'
$string = addslashes($json);
var_export($str);   // '{\\"foo\\":\\"bar\\"}'

哪n在JavaScript中使用这些值时， $ json 将包含有效的对象表达式，而 $ str 将包含字符串表达式：

When using these values in JavaScript, $json will contain a valid object expression while $str will contain a string expression:

var json = <?php echo $json; ?>,
    str = "<?php echo $str; ?>";

这将变为：

var json = {"foo":"bar"},
    str = "{\"foo\":\"bar\"}";

因此，只需使用 json_encode ，而无需进一步应用编码/转义。就您而言（因为 searchResults 已经返回JSON字符串）：

So just use json_encode without applying any further encoding/escaping. In your case (as searchResults does already return a JSON string):

var test_json = <?php echo searchResults('windows'); ?>;

这篇关于将json对象从php分配到javascript有什么问题？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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