如何正确使用dojo.xhrPost？

Question

Here is my JS:

<script>
dojo.require("dijit.form.Button");

function sendText(){
  var button = dijit.byId("submitButton2");

  dojo.connect(button, "onClick", function(event){
    // The parameters to pass to xhrPost, the message, and the url to send it to
    // Also, how to handle the return and callbacks.
    var xhrArgs = {
    //type: "POST",
      url: "http://testjson.php",
      content: dojo.toJson({key1:"value1",key2:"value2"},true),
      handleAs: "text",
      load: function(newContent){
        dojo.byId("response2").innerHTML = newContent;
      },
      error: function(error){
        // We'll 404 in the demo, but that's okay.  We don't have a 'postIt' service on the
        // docs server.
        dojo.byId("response2").innerHTML = "Message posted.";
      }
    }
    dojo.byId("response2").innerHTML = "Message being sent..."
    // Call the asynchronous xhrPost
    var deferred = dojo.xhrPost(xhrArgs);
  });
}
dojo.ready(sendText);
    </script>

Here is my PHP:

    <?php 

foreach($_POST as $key => $val) echo '$_POST["'.$key.'"]='.$val.'<br />';

?>

The problem is that nothing is being returned. If I put content instead of postData I have $_POST[0]='{', $_POST[1]='k' etc character by character, limited to 1000. This is a big problem.

Please can somebody tell me what I'm doing wrong? I got this code right from the dojo website, so it should be alright.

Answer 1

I believe your content is being sent character by character because you are converting your content object into JSON. According to the dojo.xhrPost documentation , the content property is expected to be a JavaScript Object. I hope this helps solve your problem.

It should be noted that this module is deprecated in favor of dojo/request/xhr , so it is better to use that unless you have lower version requirements.

Answer 2

The php $_POST array only shows form encoded data. In your example you are POSTing json, so it won't directly show up in $_POST .

You have a couple options here. You could continue to post the data as json and read the POSTed json directly from the php input stream: $data = json_decode(file_get_contents('php://input')); . This is probably the easiest, and it replaces accessing the $_POST array for the data.

Other options include not POSTing json (just send form encoded data) and POSTing json as form encoded data:

In that case, your content would become something like

content: 'my_post_data='+dojo.toJson({key1:"value1",key2:"value2"}, true), (you may need to change handleAs fyi)

Then on the server side you would likely see something like

$_POST['my_post_data']= '{"key1":"value1","key2":"value2"}' which could be processed by json_decode()