JSON Parameters set from javascript at runtime

[Steve Pisani]

Hi,

 

Before invoking the javascript client side json.getContentObject() method, I want to see the parameters for the json component.  Their values sit in text boxes on my page.  Two text boxes:

 

<text id="objectClass" label="ClassName"  />
<text id="objectID" label="Id"  />

 

I have tried the following:

 

var jprov=zen("json")

jprov.parameters['classname'].value=zen("objectClass").value
                jprov.parameters['objectID'].value=zen("objectID").value

 

 

however, in the callback server side method pointed to by the attribute OnGetTargetObject:

 

Method GetJSONObject(ByRef pParameters, Output pObject As %Library.RegisteredObject) As %Status
{
                set tStatus=$$$OK
               
                set tClass=$g(pParameters("classname"))
                set tID=$g(pParameters("objectID"))
               
                quit:tClass="" $$$OK
                quit:tID="" $$$OK
               
               
                /// simplest case - return object
                set pObject=$classmethod(tClass,"%OpenId",tID)
               
                quit tStatus
}

 

This always QUITS, because ‘tClass’ and indeed pParameters is empty.

 

How can I programmatically set the parameters of the <jsonProvider> component from javascript ??

 

Thanks in advance –

 

Steve Pisani

[Dale du Preez]

Hi Steve,

How have you defined your jsonProvider in your XML? The expected parameters must be specified as <parameter /> children of the jsonProvider element.

Dale

P.S. The sample you sent out is very insecure! You will likely want to do some sanity checking of the class name before you open up all persistent objects to the user, especially since they can manipulate the client-side properties using any Javascript debugger or console.

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[Steve Pisani]

Hi Dale –

 

Like this:

 

<jsonProvider id="json" OnGetTargetObject="GetJSONObject" >
<parameter paramName="classname" id="parClassname" />
<parameter paramName="objectID" id="parObjectID"/>
</jsonProvider>

 

Steve

[Dale du Preez]

Hi Steve,

I generally set the parameter value after getting the parameter by its ID. I am sure I ran into similar trickiness when using parameters... and decided to go that way instead!

So something like:

zen('parClassname').value = 'yourClass';

Dale

[Steve Pisani]

Ok thanks.

 

For reference therefore:

 

Addressing the parameter directly rather than as an element of the property array associated with the jsonProvider component solved the problem:

 

So this works

 

                zen(<idOfParameter>).value = <value>

 

and this does not:

 

var jprov=zen("json")

jprov.parameters[<paramName>].value=<value>

 

 

Thanks Dale.

(in truth I thought I had tried that and dismissed it,  but I obviously did not…!)