[x3d-public] good example for ECMAScripting and Protos?

[Leonard Daly]

I am replying to an early message in this thread, but I hope to capture 
comments from all messages in the thread. My comments only apply to the 
web browser (HTML5) environment.

First, any Script tag (in any case) will be handled by the web browser, 
and the web browser will parse content before anything else. If you 
really need to independently parse some tags, you will need to "read" it 
into a JavaScript variable and handle it that way. If it's in the page 
file, it will be parsed.

There was a suggestion to use "text/x3dscript" or some other string. The 
W3C has something to say about this at 
https://www.w3.org/TR/html5/scripting-1.html#the-script-element. The 
value of the type attribute must either be

 1. omitted
 2. JavaScript MIME type
 3. "module"
 4. any other valid mime type

So the use of an invalid MIME type is not technically valid HTML. This 
may cause a problem with some browsers or validators; or present future 
problems if that string is ever defined to have a particular meaning.

X3DOM does not have X3D scripting. If you need scripting to correctly 
process an X3DOM environment; then you need to do it in HTML5 
Javascript. X3DOM does not process the Script tag, that is done by 
HTML5. While X3DOM parser could recognize that tag, it does not; hence, 
none of the X3DOM methods are available to handle interactions on a 
Script node (a Script tag parsed into DOM).

The X3D Script / HTML5 Script tag name conflict is a long-standing and 
known issue. To my knowledge no work has been done to break the conflict.

Leonard Daly





> Here’s my current code for clearing the ECMAScript out of a X3D file 
> so that it doesn’t show on the screen:
>
>                        $(selector+" 
> Script").contents().filter(function () {
>
>                             return this.nodeType === 3 || 
> this.nodeType === 4;
>
>                        }).remove();
>
> This retains the fields.  I may change my code to work with fields 
> instead of parsing out the fields into properties (but directOutput is 
> nice).  This would mean that X3DOM has to route to and from the script 
> fields (is this possible?).
>
> John
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for 
> Windows 10
>
> *From: *John Carlson <mailto:yottzumm at gmail.com>
> *Sent: *Saturday, August 4, 2018 4:56 AM
> *To: *vmarchetti at kshell.com <mailto:vmarchetti at kshell.com>; X3D-Public 
> <mailto:x3d-public at web3d.org>; x3dom mlist 
> <mailto:x3dom-users at lists.sourceforge.net>; Andreas Plesch 
> <mailto:andreasplesch at gmail.com>
> *Subject: *RE: [x3d-public] good example for ECMAScripting and Protos?
>
> I have a problem with this file in X3DOM, because as far as I can 
> tell, the SFNode fields (the node, not the field) do not have 
> getFieldValue for point etc. as a function, for example (but one can 
> double check me).  In other words, I don’t think this node is an X3DOM 
> node.
>
> Thus I cannot take a reasonable length in the script.  One would have 
> to parse the string.
>
>
> That’s as clear as I can get.  I think this might be because x3dom 
> does not process scripts correctly. We would need a script tag 
> handler, and a field handler inside that.
>
> Can you help Andreas?  I’ve created a script tag before, but that code 
> is lost. It might be in my GitHub repository somewhere, not sure.
>
> We just need a script tag that has fields, but doesn’t execute its 
> CDATA section.  I am pretty sure
>
> How is V4.0 handling this?
>
> Alternatively, I can change my nodeUtil code to look at the type and 
> do the right thing converting a string to the correct type.   
> Suggestions are welcome.
>
> Thanks for the great example, Vince,
>
> Should I adapt my code to deal with this failing in X3DOM, or should 
> we change X3DOM?
>
> John
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for 
> Windows 10
>
> *From: *vmarchetti at kshell.com <mailto:vmarchetti at kshell.com>
> *Sent: *Wednesday, August 1, 2018 9:04 PM
> *To: *John Carlson <mailto:yottzumm at gmail.com>; X3D-Public 
> <mailto:x3d-public at web3d.org>
> *Subject: *Re: [x3d-public] good example for ECMAScripting and Protos?
>
> See
>
> http://www.kshell.com/pages/pointcloudvisualization/SphereDirectedPointSet.x3d
>
> It is a X3D file with with a Prototype + ecmascript definition of a 
> point cloud, with a vector attached to each point of the cloud.
>
> Example used is just points randomly distributed on sphere with 
> directs pointed radially outward.
>
> Potential uses would be to implement the scanning design pattern 
> at http://x3dgraphics.com/examples/X3dForAdvancedModeling/Scanning/X3dMeshDesignPatternIndex.html 
> , or
>
> visualizing fluid flow or  electromagnetic field
>
>     On Jul 31, 2018, at 10:30 PM, John Carlson <yottzumm at gmail.com> wrote:
>
>     Is there a good example of ECMAScripting in X3D that I can use to
>     test my X3D JSON ECMAScript preprocessor?  Preferably with Protos
>
>     Thanks!
>
>     John
>
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-- 
*Leonard Daly*
3D Systems & Cloud Consultant
LA ACM SIGGRAPH Past Chair
President, Daly Realism - /Creating the Future/
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