问题
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>
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($xml);
}
There is no error in error console but there is no value received. It outputs like array(0) { } for var_dump($_POST); EDIT I added a test alert after success function and it prints out failure
This is the the script
<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>
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\"}}]};
回答1:
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.
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\\"}'
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; ?>";
This will become:
var json = {"foo":"bar"},
str = "{\"foo\":\"bar\"}";
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'); ?>;
回答2:
If the searchResults function doesn't already return JSON, then json_encode() would be easier, e.g.
<script type="text/javascript">
var msg_top = <?php echo json_encode(searchResults('windows'));?>;
</script>
If the searchResults function already returns proper JSON, you should just be able to assign the output directly, e.g.
<script type="text/javascript">
var msg_top = <?php echo searchResults('windows');?>;
</script>
来源：https://stackoverflow.com/questions/4276432/whats-wrong-with-this-assignment-of-json-object-from-php-to-javascript