How can I overcome “Error calling method on NPObject” and Play() a SWF?

问题

I am working on a quiz system. Normally it uses jpeg images with each question. But a few of the quizzes instead feature animated .SWF files. I want to use jquery swfobject to call the play() method, once the user has clicked on an answer.

My solution works fine locally, but when I try to run it online, it throws the "Error calling method on NPObject!" message.

The quiz HTML is located on www.somedomain.com and the SWFs are on images.somedomain.com. So, I'm guessing this is a cross-domain thing.

Trouble for me is, I don't know anything about Flash... how to edit SWF files, anything about Flash attributes, or the like.

Here's an example of my code:

<div class="photos">
    <object data="http://images.somedomain.com/q1tattooquiz.swf" type="application/x-shockwave-flash" width="600" height="350">
        <param name="movie" value="http://images.somedomain.com/q1tattooquiz.swf">
        <param name="wmode" value="opaque">
    </object>
</div>

And the javascript:

if (hasFlash) {
    $('#question'+quesNum+' .photos').flash(function() { this.Play(); } );
    }

It's pretty simple, and as I said, it works fine on my PC. But once uploaded, it errors out.

What can I add to my javascript to make these files work right?

回答1:

Kirkman14,

Apart from the allowScriptAccess thingy, make sure you are calling the functions with the correct number of parameters, matching AS declaration. If your AS declares:

function playSound(event:MouseEvent):void{
// code here
}

then make sure you use the function accordingly playSound(null). I've been through this myself.

回答2:

I think there isn't a way to avoid changing the SWF. You need to put this line in Flash: flash.System.Security.allowDomain('*'); This is only needed it you are trying to call a function in the SWF from JS. For the opposite direction, also set allowScriptAccess to always in your embed code. Note that this param might be case-sensitive, if I remember correctly.

回答3:

You could try setting allowscriptaccess to "always". allowscriptaccess is the same kind of parameter as wmode in your sample code.

回答4:

It was suggested to me to create crossdomain.xml files that whitelist domains the flash will communicate with. I haven't had any success with this yet though (but perhaps my problem is different from yours).

回答5:

For me, this issue arose because, in Flex, I'd set to static a function that bore ExternalInterface calls. If the problem function is static, try undoing that.

来源：https://stackoverflow.com/questions/5607726/how-can-i-overcome-error-calling-method-on-npobject-and-play-a-swf

标签

javascript

jquery

flash

swfobject