Ajax Post instances in JavaScript

First, the XMLHttpRequest of the original ecology

The code is as follows

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<script language= "JavaScript" > function Saveintroduce () { Get the Accept return information layer var introducemsg = document.getElementById ("introducemsg"); Get form objects and user information values var f = Document.introduceedt; var elm1 = encodeURIComponent (F.elm1.value); Receive the URL address for the form var url = "save.php?id=<?=$_get[" id "]?>"; The value of the post is required to join each variable by & var poststr = ' elm1= ' + elm1; Instantiating Ajax var ajax = Initajax (); var Ajax = false; Start initializing the XMLHttpRequest object if (window. XMLHttpRequest) {//mozilla Browser Ajax = new XMLHttpRequest (); if (Ajax.overridemimetype) {//Set MIME category Ajax.overridemimetype ("Text/xml"); } } else if (window. ActiveXObject) {//IE browser Try { Ajax = new ActiveXObject ("Msxml2.xmlhttp"); } catch (E) { Try { Ajax = new ActiveXObject ("Microsoft.XMLHTTP"); } catch (e) {} } } if (!ajax) {///exception, failed to create object instance Window.alert ("Cannot create XMLHttpRequest object instance."); return false; } To open a connection by post Ajax.open ("POST", url, True); Defines the transmitted file HTTP header information Ajax.setrequestheader ("Content-type", "application/x-www-form-urlencoded"); Send post data Ajax.send (POSTSTR); Get Execution status Ajax.onreadystatechange = function () { If the execution status succeeds, the return information is written to the specified layer if (ajax.readystate = = 4 && ajax.status = 200) { introducemsg.innerhtml = Ajax.responsetext; } } } </script> <form id= "Introduceedt" name= "Introduceedt" action= "save.php>" method= "POST" > <input name= "elm1" id= "elm1" ><input type= "button" value= "Submit Form" onclick= "Saveintroduce ()" ><div id= " Introducemsg "></div></div></td> </form>

Two, jquery Ajax.post

1.jQuery $.post () method

The $.post () method requests data from the server via an HTTP POST request.

Instance

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$ ("button"). Click (function () { $.post ("demo_test_post.asp", { Name: "Donald Duck", City: "Duckburg" }, function (data,status) { Alert ("Data:" + Data + "Status:" + status); }); });

2, the general format of $.ajax

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$.ajax ({ Type: ' POST ', Url:url, Data:data, Success:success, Datatype:datatype });

Ii. Description of $.ajax parameters

Parameter description
URL required. Specify which URL to send the request to.
Data is optional. The mapping or string value. Specify the data to be sent to the server along with the request.
Success (data, Textstatus, JQXHR) is optional. The callback function to execute when the request succeeds.
DataType Optional. Specify the data type of the expected server response.

The default execution of intelligent judgments (XML, JSON, script, or HTML).