Web студия "GrandView"

Description

string wddx_serialize_value ( mixed var [, string comment] )

wddx_serialize_value() is used to create a WDDX packet from a single given value. It takes the value contained in var, and an optional comment string that appears in the packet header, and returns the WDDX packet.

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wddx_serialize_value

chris at digitalbase dot com
04-Jan-2002 04:36


When serializing JavaScript objects to interact with PHP objects, you should make the JavaScript object's first entry a php_class_name.



PHP:

class myclass {

    var $name;

    var $age;

    var $ssn;

    ...

    

    function myclass() {

        $this->name = "";

        $this->age = "";

        $this->ssn = "";

        ...

    }

}



JavaScript:

// serialization example code is from the 

// WDDX SDK http://www.openwddx.org

function SerializeMsg(name, age, ssn, ...) {

    var MyObj = new Object;

    

    // the following line is necessary in order

    // to deserialize back to a PHP object

    MyObj.php_class_name = "myclass";

    

    MyObj.name = name;

    MyObj.age = age;

    MyObj.ssn = ssn;

    ...

    

    // Create a new serializer "object" to do our work for us

    MySer = new WddxSerializer;



    // Serialize the Message variable into a WDDX Packet

    MyWDDXPacket = MySer.serialize(MyObj);



    // Output WDDX Packet so we can see what it looks like

    return MyWDDXPacket;

}



Now you can use this in a page which is its own form action:

<?php

// don't forget to include the class definition from above!

if (!isSet($wddx_packet))

    $MyObj = new myclass();

else

    $MyObj = wddx_deserialize($wddx_packet);

?>



<html>

<head>

<script language="JavaScript">

<!--

function Init() {

    // sets the form's text-elements

    tmp = document.MyForm;

    

    tmp.name.value = "<? echo $MyObj->name ?>";

    tmp.age.value = "<? echo $MyObj->age ?>";

    tmp.ssn.value = "<? echo $MyObj->ssn ?>";

    ...

}



function SerializeMsg(name, age, ssn, ...) {

// see above!

}



function SubmitForm() {

    // sumbits the form

    tmp = document.MyForm;

    

    tmp.wddx_packet.value =

    SerializeMsg(tmp.name.value, tmp.age.value, tmp.ssn.value,...);

    document.submit();

}

// -->

</script>

</head>

<body>

...

<form name="MyForm"

action="<? echo $PHP_SELF ?>" method="post">

<input name="wddx_packet" type="hidden">

<input name="name" type="text">

<input name="age" type="text">

<input name="ssn" type="text">

...

<input name="SubmitBtn" type="button" onclick="SumbitForm()">

</form>

</body>

</html>



---------------------------------

If you don't provide that first 'php_class_name' in the JavaScript function, then when PHP deserializes it will deserialize into an associative array and not an object instance.



Note that this provides a way to maintain state without

using sessions or cookies - just good old HTML!



Hope this helps!

--

Chris Hansen

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