Ajax Post Way Send request server cannot receive data problem solution

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The code is as follows

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<script language= "JavaScript" > function Setviewpoint () { var msg = ""; Used to receive returned data Instantiating Ajax var leeajax = Leeinitajax (); var webRoot = window.location; WebRoot = Webroot.tostring (); var domain = webroot.substring (7); var endd = Domain.indexof ("/"); Domain = domain.substring (0,endd); Receive the URL address for the form var url = "http://" +domain+ "/plus/leegetviewforway.php"; To open a connection by post Leeajax.open ("POST", url, True); Defines the transmitted file HTTP header information Leeajax.setrequestheader ("Content-type", "APPLICATION/X-WWW-FORM-URLENCODED;CHARSET=GBK"); The value of the post is required to join each variable by & Send post data var poststr = "viewid= ' asdf ' &id= ' Asdfa '" Leeajax.send (POSTSTR),//Get execution status Leeajax.onreadystatechange = function () { If the execution status succeeds, the return information is written to the specified layer if (leeajax.readystate = = 4 && leeajax.status = 200) { msg = leeajax.responsetext;//obtained return value Alert (msg); } } } function Leeinitajax () { var Leeajax=false; try{ if (window. ActiveXObject) { for (var i = 5; i; i--) { try{ if (i = = 2) { Leeajax = new ActiveXObject ("Microsoft.XMLHTTP"); } else { Leeajax = new ActiveXObject ("msxml2.xmlhttp." + i + ". 0"); } Break catch (e) { Leeajax = false; } } else if (window. XMLHttpRequest) { Leeajax = new XMLHttpRequest (); if (Leeajax.overridemimetype) { Leeajax.overridemimetype (' Text/xml '); } } catch (e) { Leeajax = false; } return leeajax; } </script>

The PHP code is as follows:

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<?php $a = $_request ["Viewid"]. ") ___ (". $_request[" id "]; if ($_post ["Viewid"]== ") $a. =" <br/>___ "; echo $a; ?>

So in the building to send data from the string into a JS object, but still not. Had to check the data. The original is to set the encoding type of data sent. The code is as follows:

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var myquery = Myinput (); Xmlhttp.open ("POST", "post.php", true); Xmlhttp.setrequestheader ("Content-type", "application/x-www-form-urlencoded"); Xmlhttp.onreadystatechange = byphp;

Xmlhttp.send (myquery); The application/x-www-form-urlencoded encoding type is the default encoding type for the form to send data, and is not expected to be explicitly stated in an AJAX request, This adds a third line of code to indicate the format is correct, the problem solved. It is much easier to send a post-mode Ajax request via jquery without adding this line. Once again I feel the power and convenience of jquery.

To send an AJAX asynchronous request with post, you will be sending your data uniformly in the Send () method, not send (null).

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Xml.setrequestheader (' Content-type ', ' application/x-www-form-urlencoded ');

This sentence is not written in get mode, but it is necessary in the post mode, because you use Send (NULL) in the post mode, which causes no data to be sent to the index1.php, so you cannot see the effect of this sentence.

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Get (' index1.php?c=1 ', a) " Get (' index1.php?c=2 ', a) "

Two buttons send the data only c This parameter is different, so you can put index1.php and a are written in the inside of your get method, the modified get method is like this

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function get (num) { Data= "index1.php"; if (XML) { var Obj=document.getelementbyid ("a"); Xml.open ("POST", data); Xml.onreadystatechange=function () { if (xml.readystate==4&&xml.status==200) { Obj.innerhtml=xml.responsetext; } } Xml.setrequestheader ("Content-type", "application/x-www-form-urlencoded"); var querystring= "c=" +num; Xml.send (querystring); } }

Of course

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Get (' index1.php?c=1 ', a) " Get (' index1.php?c=2 ', a) " We should change it accordingly. Get (1); Get (2);

This enables you to successfully request data asynchronously from the server using the Post method.