JSON_ENCODE尝试转义两次

Question

I am using this controller to fetch data from my database and then send them back as valid JSON data but my http response although has valid JSON, it's text/html instead of application/json so getJSON doesn't work. (unless getJSON is supposed to work anyway?)

  public function sendjsonAction()
  {
$encoders = array(new XmlEncoder(), new JsonEncoder());
$normalizers = array(new GetSetMethodNormalizer());
$serializer = new Serializer($normalizers, $encoders);

    $message = $this->getDoctrine()
    ->getRepository('AcmeStoreBundle:Message')
    ->findAll();
    $serializer = $serializer->serialize($message, 'json');
    return new Response($serializer);
}

here's what I get when I visit the json url:

[{"id":1,"iam":1,"youare":2,"lat":50.8275853,"lng":4.3809764,"msgbody":"I saw you over there what's up!"},{"id":2,"iam":1,"youare":2,"lat":50.8275853,"lng":4.3809764,"msgbody":"I saw you over there what's up!"},{"id":3,"iam":1,"youare":2,"lat":50.8275853,"lng":4.3809764,"msgbody":"I saw you over there what's up!"},{"id":4,"iam":1,"youare":2,"lat":50.8275853,"lng":4.3809764,"msgbody":"I saw you over there what's up!"},{"id":5,"iam":1,"youare":2,"lat":50.8275853,"lng":4.3809764,"msgbody":"I saw you over there what's up!"},{"id":6,"iam":1,"youare":2,"lat":50.8275853,"lng":4.3809764,"msgbody":"I saw you over there what's up!"}]

So I have another page, called "showall" which has the following Javascript:

$.getJSON('/app_dev.php/sendjson', function(data) {
  var items = [];

  $.each(data, function(key, val) {
    items.push('<li id="' + key + '">' + val + '</li>');
  });

  $('<ul/>', {
    'class': 'my-new-list',
    html: items.join('')
  }).appendTo('body');
});

And the result of that JS is this html:

<ul class="my-new-list">
<li id="0">[object Object]</li>
<li id="1">[object Object]</li>
<li id="2">[object Object]</li>
<li id="3">[object Object]</li>
<li id="4">[object Object]</li>
<li id="5">[object Object]</li>
</ul>

If I attempt to use json_encode, then things get even messier.. Here's the answer I get:

"[{\"id\":1,\"iam\":1,\"youare\":2,\"lat\":50.8275853,\"lng\":4.3809764,\"msgbody\":\"I saw you over there what's up!\"},{\"id\":2,\"iam\":1,\"youare\":2,\"lat\":50.8275853,\"lng\":4.3809764,\"msgbody\":\"I saw you over there what's up!\"},{\"id\":3,\"iam\":1,\"youare\":2,\"lat\":50.8275853,\"lng\":4.3809764,\"msgbody\":\"I saw you over there what's up!\"},{\"id\":4,\"iam\":1,\"youare\":2,\"lat\":50.8275853,\"lng\":4.3809764,\"msgbody\":\"I saw you over there what's up!\"},{\"id\":5,\"iam\":1,\"youare\":2,\"lat\":50.8275853,\"lng\":4.3809764,\"msgbody\":\"I saw you over there what's up!\"},{\"id\":6,\"iam\":1,\"youare\":2,\"lat\":50.8275853,\"lng\":4.3809764,\"msgbody\":\"I saw you over there what's up!\"}]"

escaped double quotes... ! Should I add an option to json_encode so that it doesn't escape these double quotes?

Answer 1

如果您依赖Content-Type ，请使用header()设置适当的内容：

header('Content-type: application/json');

Answer 2

Change:

items.push('<li id="' + key + '">' + val + '</li>');

to:

items.push('<li id="' + key + '">' + val.msgbody + '</li>');

You don't need to set the Content-type when using $.getJSON -- it assumes the output is JSON. You need it if you use more generic methods like $.get , $.post , or $.ajax . They all allow you to specify a dataType: 'json' option to tell it that the output is JSON as well, but if you leave out the option they look at the Content-type to decide how to parse it.