postSync

performs a sync-POST ajax request

url	string	url to the server side
params	string	optional, POST params

object

loader object

Example

// simple data sending w/o post params
var r = dhx.ajax.postSync("server.php?keep_alive=1");
 
// simple data sending with params
var r = dhx.ajax.postSync("server.php", "keep_alive=1&version=std");

• to prevent caching in some browsers an extra param like "dhxr0123456789" will be added
  (to disable: dhx.ajax.cache=true, please check details here)

• sync POST request will be performed

var r = dhx.ajax.postSync("server.php");
console.log(r.xmlDoc.responseText); // script will wait for response

• getting xml from response, make sure server returns valid xml and the "content-type" header is set

// for php
header("Content-Type: text/xml");

<!-- assuming that the response is the following -->
<items>
    <item name="first" value="a"/>
    <item name="second" value="b"/>
</items>

var r = dhx.ajax.postSync("server.php", "action=get_nodes");
var items = [];
var xml = r.xmlDoc.responseXML;
var nodes = xml.getElementsByTagName("items");
for (var q=0; q<nodes.lengt; q++) {
    items.push({
        name:   nodes[q].getAttribute("name"),
        value:  nodes[q].getAttribute("value")
    });
}

• getting json from response

// assuming that the response is the following
{status: "ok", data: "value", data2: "value2"}

var r = dhx.ajax.postSync("server.php", "action=get_nodes");
var t = dhx.s2j(r.xmlDoc.responseText); // convert response to json object
if (t != null && t.status == "ok") {
    // response is ok
}

• you can both get/post params

var r = dhx.ajax.postSync("server.php?get1=1&get2=2", "post3=3&post4=4");

print_r($_REQUEST);
// result
Array
(
    [get1] => 1
    [get2] => 2
    [post3] => 3
    [post4] => 4
)
 
print_r($_GET);
// result
Array
(
    [get1] => 1
    [get2] => 2
)
 
print_r($_POST);
// result
Array
(
    [post3] => 3
    [post4] => 4
)

added in 4.0

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