How to get the returned value from GM_getValue() in unsafeWindow ?

[Kuo Yang]

Hi everyone,

Please forgive my not-so-well English.

I have already read http://wiki.greasespot.net/0.7.20080121.0_compatibility.
The script I am writing is to display picture thumbnails from links
like http://moby.to/rrrg1x.

I got 'Greasemonkey access violation: unsafeWindow cannot call
GM_getValue.' errors when I call MobyUtils.getThumbUrl() function. And
the code is listed below.

I am not sure whether the GM_getValue was called in unsafeWindow,
because I am not using the 'unsafeWindow' word at all. I just want to
load the api key at run time via getKey method.

So, how can I get the returned value from GM_getValue() properly?

Thanks.

MobyUtils = {

        apiKeyStorage: "mobypicture.api.key",
        apiKeyCache: '',

        setKey:function(key){
                GM_setValue(this.apiKeyStorage,key);
        },

        getKey: function(){
                return this.apiKeyCache || ( this.apiKeyCache = GM_getValue
(this.apiKeyStorage) );
        },

        getThumbUrl: function(tinyUrlCode, size, format, callback){

                if('function' === typeof size){
                        callback = size;
                        size = null;
                }

                if('function' === typeof format){
                        callback = format;
                        format = null;
                }

                size = size || 'small';
                format = format || 'json';

                url = 'http://api.mobypicture.com/?action=getThumbUrl'
                + '&t=' + encodeURIComponent(tinyUrlCode)
                + '&s=' + size
                + '&k=' + encodeURIComponent(this.getKey())
                + '&format=' + format;

                tFormat = (format == 'plain')?'text':format;

                $.ajax({
                        'url': url,
                        'type': 'GET',
                        'success': function(data, status){callback(data, status)},
                        'dataType': tFormat
                });

        }
};
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[Erik Vold-2]

This type of thing usually happens because you attached an event
listener to a DOM element which calls MobyUtils.getThumbUrl(). The
unsafeWindow is not allowed to call functions you define in your
userscripts because if it were then webmasters could write could
potentially get access to a GM api feature such as GM_xmlhttpRequest()
and make cross site requests which they cannot do normally.

> So, how can I get the returned value from GM_getValue() properly?

Store the GM_getValue() in a js variable (which your event listener
can access) on page load and every time you update the var with
GM_setValue().

On Oct 27, 1:31 am, darasion <daras...@...> wrote:

> Hi everyone,
>
> Please forgive my not-so-well English.
>
> I have already readhttp://wiki.greasespot.net/0.7.20080121.0_compatibility.
> The script I am writing is to display picture thumbnails from links
> likehttp://moby.to/rrrg1x.
>
> I got 'Greasemonkey access violation: unsafeWindow cannot call
> GM_getValue.' errors when I call MobyUtils.getThumbUrl() function. And
> the code is listed below.
>
> I am not sure whether the GM_getValue was called in unsafeWindow,
> because I am not using the 'unsafeWindow' word at all. I just want to
> load the api key at run time via getKey method.
>
> So, how can I get the returned value from GM_getValue() properly?
>
> Thanks.
>
> MobyUtils = {
>
>         apiKeyStorage: "mobypicture.api.key",
>         apiKeyCache: '',
>
>         setKey:function(key){
>                 GM_setValue(this.apiKeyStorage,key);
>         },
>
>         getKey: function(){
>                 return this.apiKeyCache || ( this.apiKeyCache = GM_getValue
> (this.apiKeyStorage) );
>         },
>
>         getThumbUrl: function(tinyUrlCode, size, format, callback){
>
>                 if('function' === typeof size){
>                         callback = size;
>                         size = null;
>                 }
>
>                 if('function' === typeof format){
>                         callback = format;
>                         format = null;
>                 }
>
>                 size = size || 'small';
>                 format = format || 'json';
>
>                 url = 'http://api.mobypicture.com/?action=getThumbUrl'
>                 + '&t=' + encodeURIComponent(tinyUrlCode)
>                 + '&s=' + size
>                 + '&k=' + encodeURIComponent(this.getKey())
>                 + '&format=' + format;
>
>                 tFormat = (format == 'plain')?'text':format;
>
>                 $.ajax({
>                         'url': url,
>                         'type': 'GET',
>                         'success': function(data, status){callback(data, status)},
>                         'dataType': tFormat
>                 });
>
>         }
>
> };

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[Kuo Yang]

Thank you Erik.

Now my code is:

MobyUtils = {
       apiKeyCache: GM_getValue("mobypicture.api.key"),
 
       getKey: function(){return this.apiKeyCache;},
    
       ///.....
};

On Wed, Oct 28, 2009 at 3:57 AM, Erik Vold <erikvvold@...> wrote:

This type of thing usually happens because you attached an event
listener to a DOM element which calls MobyUtils.getThumbUrl(). The
unsafeWindow is not allowed to call functions you define in your
userscripts because if it were then webmasters could write could
potentially get access to a GM api feature such as GM_xmlhttpRequest()
and make cross site requests which they cannot do normally.

> So, how can I get the returned value from GM_getValue() properly?

Store the GM_getValue() in a js variable (which your event listener
can access) on page load and every time you update the var with
GM_setValue().

On Oct 27, 1:31 am, darasion <daras...@...> wrote:
> Hi everyone,
>
> Please forgive my not-so-well English.
>

> I have already readhttp://wiki.greasespot.net/0.7.20080121.0_compatibility.

> The script I am writing is to display picture thumbnails from links

> likehttp://moby.to/rrrg1x.

>
> I got 'Greasemonkey access violation: unsafeWindow cannot call
> GM_getValue.' errors when I call MobyUtils.getThumbUrl() function. And
> the code is listed below.
>
> I am not sure whether the GM_getValue was called in unsafeWindow,
> because I am not using the 'unsafeWindow' word at all. I just want to
> load the api key at run time via getKey method.
>
> So, how can I get the returned value from GM_getValue() properly?
>
> Thanks.
>
> MobyUtils = {
>
>         apiKeyStorage: "mobypicture.api.key",
>         apiKeyCache: '',
>
>         setKey:function(key){
>                 GM_setValue(this.apiKeyStorage,key);
>         },
>
>         getKey: function(){
>                 return this.apiKeyCache || ( this.apiKeyCache = GM_getValue
> (this.apiKeyStorage) );
>         },
>
>         getThumbUrl: function(tinyUrlCode, size, format, callback){
>
>                 if('function' === typeof size){
>                         callback = size;
>                         size = null;
>                 }
>
>                 if('function' === typeof format){
>                         callback = format;
>                         format = null;
>                 }
>
>                 size = size || 'small';
>                 format = format || 'json';
>
>                 url = 'http://api.mobypicture.com/?action=getThumbUrl'
>                 + '&t=' + encodeURIComponent(tinyUrlCode)
>                 + '&s=' + size
>                 + '&k=' + encodeURIComponent(this.getKey())
>                 + '&format=' + format;
>
>                 tFormat = (format == 'plain')?'text':format;
>
>                 $.ajax({
>                         'url': url,
>                         'type': 'GET',
>                         'success': function(data, status){callback(data, status)},
>                         'dataType': tFormat
>                 });
>
>         }
>
> };

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