[svg-developers] Re: Detect native SVG support
Mark Birbeck [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] But as you know, the SVG spec defines a large number of possible values to test for with DOMImplementation, not just do you have SVG?. So ideally we should be able to test for the language features we want, without using hacks (sorry, I mean heuristic methods). Right, so we agree that Mozilla SVG and SideWinder would be non-conformant and incorrect if they return true for http://www.w3.org/TR/SVG11/feature#SVG since they don't fulfill any of the sub ones. Do they fulfil any of the sub-ones, I believe not, because to claim that they do, they have to meet: ... the viewer can process and render successfully all of the language features ... Since they contain bugs and partial implementations, they should not claim any of the features. Of course this problem is common to the entire feature string concept across all languages, but that's just unfortunate that it ever became a specifcation. The HTML scripting world has shown how heuristic methods are extremely successful in dealing with different implementations, no-one uses the DOMImplementation interface, it's simply not acceptable due to the wild claims of some browsers (claiming support before there was only partial support) and the overly-prudent claims of others (claiming no-support when there was pretty good support) Cheers, Jim. Yahoo! Groups Sponsor ~-- font face=arial size=-1a href=http://us.ard.yahoo.com/SIG=12hlnqdd7/M=362131.6882499.7825260.1510227/D=groups/S=1706030389:TM/Y=YAHOO/EXP=1123011190/A=2889191/R=0/SIG=10r90krvo/*http://www.thebeehive.org Get Bzzzy! (real tools to help you find a job) Welcome to the Sweet Life - brought to you by One Economy/a./font ~- - To unsubscribe send a message to: [EMAIL PROTECTED] -or- visit http://groups.yahoo.com/group/svg-developers and click edit my membership Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/svg-developers/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [svg-developers] Re: Detect native SVG support
Jim, Sidewinder wouldn't be conformant or non-conformant. We just pass a call to the methods on a DOMImplementation to the implementations that we've instantiated to create that implementation. In the case of an object that 'supports' SVG it would most likely be ASV (although it would depend on the user's machine). So whether ASV (or whatever SVG plug-in is in use) is non-conformant for claiming to support whatever feature strings it claims to support, is something that I couldn't answer. As to adding more and more hacks, no one doubts that you can keep adding another line of script to test for yet another permutation. But as the world of compound documents gets closer, don't you think that there needs to be a generic solution that allows for testing not just for SVG, but for MathML, XForms and so on? I recognise your criticisms of DOMImplementation, but at some point we do need it to work...or rather it needs to be made to work. All the best, Mark Mark Birbeck CEO x-port.net Ltd. e: [EMAIL PROTECTED] t: +44 (0) 20 7689 9232 w: http://www.formsPlayer.com/ b: http://internet-apps.blogspot.com/ Download our XForms processor from http://www.formsPlayer.com/ -Original Message- From: svg-developers@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Jim Ley Sent: 02 August 2005 18:30 To: svg-developers@yahoogroups.com Subject: [svg-developers] Re: Detect native SVG support Mark Birbeck [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] But as you know, the SVG spec defines a large number of possible values to test for with DOMImplementation, not just do you have SVG?. So ideally we should be able to test for the language features we want, without using hacks (sorry, I mean heuristic methods). Right, so we agree that Mozilla SVG and SideWinder would be non-conformant and incorrect if they return true for http://www.w3.org/TR/SVG11/feature#SVG since they don't fulfill any of the sub ones. Do they fulfil any of the sub-ones, I believe not, because to claim that they do, they have to meet: ... the viewer can process and render successfully all of the language features ... Since they contain bugs and partial implementations, they should not claim any of the features. Of course this problem is common to the entire feature string concept across all languages, but that's just unfortunate that it ever became a specifcation. The HTML scripting world has shown how heuristic methods are extremely successful in dealing with different implementations, no-one uses the DOMImplementation interface, it's simply not acceptable due to the wild claims of some browsers (claiming support before there was only partial support) and the overly-prudent claims of others (claiming no-support when there was pretty good support) Cheers, Jim. Yahoo! Groups Sponsor ~-- font face=arial size=-1a href=http://us.ard.yahoo.com/SIG=12hlnqdd7/M=362131.6882499.7 825260.1510227/D=groups/S=1706030389:TM/Y=YAHOO/EXP=1123011190 /A=2889191/R=0/SIG=10r90krvo/*http://www.thebeehive.org Get Bzzzy! (real tools to help you find a job) Welcome to the Sweet Life - brought to you by One Economy/a./font -- --~- - To unsubscribe send a message to: [EMAIL PROTECTED] -or- visit http://groups.yahoo.com/group/svg-developers and click edit my membership Yahoo! Groups Links Yahoo! Groups Sponsor ~-- font face=arial size=-1a href=http://us.ard.yahoo.com/SIG=12hjjv13p/M=362131.6882499.7825260.1510227/D=groups/S=1706030389:TM/Y=YAHOO/EXP=1123012785/A=2889191/R=0/SIG=10r90krvo/*http://www.thebeehive.org Get Bzzzy! (real tools to help you find a job) Welcome to the Sweet Life - brought to you by One Economy/a./font ~- - To unsubscribe send a message to: [EMAIL PROTECTED] -or- visit http://groups.yahoo.com/group/svg-developers and click edit my membership Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/svg-developers/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [svg-developers] Re: Detect native SVG support
* Mark Birbeck wrote: As to adding more and more hacks, no one doubts that you can keep adding another line of script to test for yet another permutation. But as the world of compound documents gets closer, don't you think that there needs to be a generic solution that allows for testing not just for SVG, but for MathML, XForms and so on? I recognise your criticisms of DOMImplementation, but at some point we do need it to work...or rather it needs to be made to work. I certainly agree. Such facilities aren't cheap though, you need * Very clear well-defined conformance requirements * Extensive test suites for these facilities * Strong commitment to 100% compliance * Strong and reliable means to enforce compliance At the moment, for SVG feature strings, we don't have any of that. In fact, it's probably worse, there are still many authors who do not care at all even about most basic conformance requirements like using well- formed XML; many authors still think We usually find checking with [IE, Opera and Firefox] is enough for our work. If we can't convince authors to ensure their content is conforming, there is little hope to convince implementers to code correctly. -- Björn Höhrmann · mailto:[EMAIL PROTECTED] · http://bjoern.hoehrmann.de Weinh. Str. 22 · Telefon: +49(0)621/4309674 · http://www.bjoernsworld.de 68309 Mannheim · PGP Pub. KeyID: 0xA4357E78 · http://www.websitedev.de/ Yahoo! Groups Sponsor ~-- font face=arial size=-1a href=http://us.ard.yahoo.com/SIG=12hiiuhpk/M=362131.6882499.7825260.1510227/D=groups/S=1706030389:TM/Y=YAHOO/EXP=1123020714/A=2889191/R=0/SIG=10r90krvo/*http://www.thebeehive.org Get Bzzzy! (real tools to help you find a job) Welcome to the Sweet Life - brought to you by One Economy/a./font ~- - To unsubscribe send a message to: [EMAIL PROTECTED] -or- visit http://groups.yahoo.com/group/svg-developers and click edit my membership Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/svg-developers/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [svg-developers] Re: Detect native SVG support
Jonathan, ... and Mozilla happily returns true for both tests. That's excellent news. I hadn't tried it, but that's good to hear. We've also (almost) got the same thing working in our Sidewinder Viewer, so hopefully this can become a general test that will indicate that you can simply send XHTML with inline SVG (and of course there will be equivalent tests for MathML, XForms and so on). The next step is obviously to pack the same info into the MIME type, but that's another story. Regards, Mark Mark Birbeck CEO x-port.net Ltd. e: [EMAIL PROTECTED] t: +44 (0) 20 7689 9232 w: http://www.formsPlayer.com/ b: http://internet-apps.blogspot.com/ Download our XForms processor from http://www.formsPlayer.com/ Yahoo! Groups Sponsor ~-- font face=arial size=-1a href=http://us.ard.yahoo.com/SIG=12ha3oohc/M=362335.6886445.7839731.1510227/D=groups/S=1706030389:TM/Y=YAHOO/EXP=1122635015/A=2894361/R=0/SIG=13jmebhbo/*http://www.networkforgood.org/topics/education/digitaldivide/?source=YAHOOcmpgn=GRPRTP=http://groups.yahoo.com/;In low income neighborhoods, 84% do not own computers. At Network for Good, help bridge the Digital Divide!/a./font ~- - To unsubscribe send a message to: [EMAIL PROTECTED] -or- visit http://groups.yahoo.com/group/svg-developers and click edit my membership Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/svg-developers/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [svg-developers] Re: Detect native SVG support
Jonathan Watt schrieb: I'm told that we are doing the right thing, and that not render doesn't mean not parse. Alternative content should still appear in the DOM as usual, and any img elements should have their content loaded. Hence the onload should fire. It seems a bit counter to what you'd expect, but there you go. your are right, that sounds plausible, no matter if its visible or not it must be part of the dom, otherwise i would'nt be able to change the alternate content via script. Marks solution seems like the cleanest . i will probably use this approach, if i need to test via script. cheers Holger On 7/28/05, Holger Will [EMAIL PROTECTED] wrote: i dont know what ive tested last time, but this indeed seems to work in IE and Opera, so this is probably a bug in mozilla, in which component would i post this bug ? Yahoo! Groups Sponsor ~-- font face=arial size=-1a href=http://us.ard.yahoo.com/SIG=12hj7c04d/M=362131.6882499.7825260.1510227/D=groups/S=1706030389:TM/Y=YAHOO/EXP=1122642779/A=2889191/R=0/SIG=10r90krvo/*http://www.thebeehive.org Get Bzzzy! (real tools to help you find a job) Welcome to the Sweet Life - brought to you by One Economy/a./font ~- - To unsubscribe send a message to: [EMAIL PROTECTED] -or- visit http://groups.yahoo.com/group/svg-developers and click edit my membership Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/svg-developers/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[svg-developers] Re: Detect native SVG support
--- In svg-developers@yahoogroups.com, Jonathan Watt [EMAIL PROTECTED] wrote: You're quite right of course. This would be the *real* way to do it, and Mozilla happily returns true for both tests. But Mozilla gives true whether the preference svg.enabled is true or not so currently the check Mark suggested does not help with Mozilla trunk builds. I think that is a bug and have filed https://bugzilla.mozilla.org/show_bug.cgi?id=302640 Yahoo! Groups Sponsor ~-- font face=arial size=-1a href=http://us.ard.yahoo.com/SIG=12hhqaeo8/M=362335.6886445.7839731.1510227/D=groups/S=1706030389:TM/Y=YAHOO/EXP=1122657527/A=2894361/R=0/SIG=13jmebhbo/*http://www.networkforgood.org/topics/education/digitaldivide/?source=YAHOOcmpgn=GRPRTP=http://groups.yahoo.com/;In low income neighborhoods, 84% do not own computers. At Network for Good, help bridge the Digital Divide!/a./font ~- - To unsubscribe send a message to: [EMAIL PROTECTED] -or- visit http://groups.yahoo.com/group/svg-developers and click edit my membership Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/svg-developers/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [svg-developers] Re: Detect native SVG support
First off, I've noticed that my suggested script doesn't work in IE6
since it doesn't seem to implement createElementNS. To prevent a
script error I'll revise my script to:
var hasNativeSVG = false;
try {
if (document.createElementNS('http://www.w3.org/2000/svg','svg').width)
hasNativeSVG = true;
} catch (e) { /* ignore exception */ };
On 7/28/05, Holger Will [EMAIL PROTECTED] wrote:
Hi Jonathan,
in most cases i tend to favor the objectalternate content/object -
syntax, which works without script.
Yup, but John asked for a script, so that's what I was trying to do.
Also the object approach will not differentiate between plug-in and
native support.
i've tried the following without success, and i wonder if the behavior
is specified like this or if its a bug.
object ...
img ... onload=alert('SVG not supported')/
/object
I thought you were trying not to rely on script support. j/k ;-)
THIS DOES NOT WORK !
the onload allways gets fired. is this right? do html clients allways
load both the objects content and the alternate content ?
is there another event that can be used ? is there any other specified
way to determin if object renders the original content or the alternate
content ?
Hmm, I'm not sure. That the onload get's evaluated seems like a bug to me.
-Jonathan
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Re: [svg-developers] Re: Detect native SVG support
Holger Will schrieb:
Jonathan Watt schrieb:
First off, I've noticed that my suggested script doesn't work in IE6
since it doesn't seem to implement createElementNS. To prevent a
script error I'll revise my script to:
var hasNativeSVG = false;
try {
if
(document.createElementNS('http://www.w3.org/2000/svg','svg').width)
http://www.w3.org/2000/svg%27,%27svg%27%29.width%29
http://www.w3.org/2000/svg%27,%27svg%27%29.width%29
hasNativeSVG = true;
} catch (e) { /* ignore exception */ };
On 7/28/05, Holger Will [EMAIL PROTECTED] wrote:
Hi Jonathan,
in most cases i tend to favor the objectalternate
content/object -
syntax, which works without script.
Yup, but John asked for a script, so that's what I was trying to do.
Also the object approach will not differentiate between plug-in and
native support.
i should have statet that this is a bit off topic. your script seems
like a very clean and easy solution !
i've tried the following without success, and i wonder if the behavior
is specified like this or if its a bug.
object ...
img ... onload=alert('SVG not supported')/
/object
I thought you were trying not to rely on script support. j/k ;-)
i still do :-) i was just wondering ...
THIS DOES NOT WORK !
the onload allways gets fired. is this right? do html clients allways
load both the objects content and the alternate content ?
is there another event that can be used ? is there any other specified
way to determin if object renders the original content or the
alternate
content ?
Hmm, I'm not sure. That the onload get's evaluated seems like a bug
to me.
yeah it seems strange but at least mozilla, opera and ie agree on the
behaviour :-)
so even if mozilla would get this right, it would be as useless as
contentDocument
for cross browser detection of svg support.
thanks for your comments anyways
Holger
i dont know what ive tested last time, but this indeed seems to work in
IE and Opera, so this is probably a bug in mozilla,
in which component would i post this bug ?
Holger
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RE: [svg-developers] Re: Detect native SVG support
Dear all,
We shouldn't really have to check for the existence of methods, etc. An HTML
DOM that can have SVG inline should really return true for one of:
document.implementation.hasFeature(org.w3c.dom.svg, 1.0)
or:
document.implementation.hasFeature(http://www.w3.org/TR/SVG11/feature#SVG;,
1.1)
I haven't tried it, but I would say that's what Opera and Mozilla _should_
provide (and may well do).
Regards,
Mark
Mark Birbeck
CEO
x-port.net Ltd.
e: [EMAIL PROTECTED]
t: +44 (0) 20 7689 9232
w: http://www.formsPlayer.com/
b: http://internet-apps.blogspot.com/
Download our XForms processor from
http://www.formsPlayer.com/
-Original Message-
From: svg-developers@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Holger Will
Sent: 28 July 2005 19:38
To: svg-developers@yahoogroups.com
Subject: Re: [svg-developers] Re: Detect native SVG support
Holger Will schrieb:
Jonathan Watt schrieb:
First off, I've noticed that my suggested script doesn't
work in IE6
since it doesn't seem to implement createElementNS. To prevent a
script error I'll revise my script to:
var hasNativeSVG = false;
try {
if
(document.createElementNS('http://www.w3.org/2000/svg','svg').width)
http://www.w3.org/2000/svg%27,%27svg%27%29.width%29
http://www.w3.org/2000/svg%27,%27svg%27%29.width%29
hasNativeSVG = true;
} catch (e) { /* ignore exception */ };
On 7/28/05, Holger Will [EMAIL PROTECTED] wrote:
Hi Jonathan,
in most cases i tend to favor the objectalternate
content/object -
syntax, which works without script.
Yup, but John asked for a script, so that's what I was
trying to do.
Also the object approach will not differentiate between plug-in
and native support.
i should have statet that this is a bit off topic. your
script seems
like a very clean and easy solution !
i've tried the following without success, and i wonder if the
behavior is specified like this or if its a bug.
object ...
img ... onload=alert('SVG not supported')/ /object
I thought you were trying not to rely on script support. j/k ;-)
i still do :-) i was just wondering ...
THIS DOES NOT WORK !
the onload allways gets fired. is this right? do html clients
allways load both the objects content and the alternate
content ?
is there another event that can be used ? is there any other
specified way to determin if object renders the
original content
or the
alternate
content ?
Hmm, I'm not sure. That the onload get's evaluated seems
like a bug
to me.
yeah it seems strange but at least mozilla, opera and ie
agree on the
behaviour :-) so even if mozilla would get this right, it
would be as
useless as contentDocument for cross browser detection of
svg support.
thanks for your comments anyways
Holger
i dont know what ive tested last time, but this indeed seems
to work in IE and Opera, so this is probably a bug in
mozilla, in which component would i post this bug ?
Holger
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Re: [svg-developers] Re: Detect native SVG support
Hi Mark, You're quite right of course. This would be the *real* way to do it, and Mozilla happily returns true for both tests. Opera doesn't support scripting of SVG (yet) I believe, so the test won't work for it, but as far as *script* testing goes this is definately the way to do it. Thanks! Jonathan On 7/28/05, Mark Birbeck [EMAIL PROTECTED] wrote: Dear all, We shouldn't really have to check for the existence of methods, etc. An HTML DOM that can have SVG inline should really return true for one of: document.implementation.hasFeature(org.w3c.dom.svg, 1.0) or: document.implementation.hasFeature(http://www.w3.org/TR/SVG11/feature#SVG;, 1.1) I haven't tried it, but I would say that's what Opera and Mozilla _should_ provide (and may well do). Regards, Mark - To unsubscribe send a message to: [EMAIL PROTECTED] -or- visit http://groups.yahoo.com/group/svg-developers and click edit my membership Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/svg-developers/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [svg-developers] Re: Detect native SVG support
I'm told that we are doing the right thing, and that not render doesn't mean not parse. Alternative content should still appear in the DOM as usual, and any img elements should have their content loaded. Hence the onload should fire. It seems a bit counter to what you'd expect, but there you go. On 7/28/05, Holger Will [EMAIL PROTECTED] wrote: i dont know what ive tested last time, but this indeed seems to work in IE and Opera, so this is probably a bug in mozilla, in which component would i post this bug ? - To unsubscribe send a message to: [EMAIL PROTECTED] -or- visit http://groups.yahoo.com/group/svg-developers and click edit my membership Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/svg-developers/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[svg-developers] Re: Detect native SVG support
Hi,
Sounds as a solution. But Mozilla is trying to implement zoom and pan
things so a viewbox will appear in future I think.
It is not that easy to determine.
John
--- In svg-developers@yahoogroups.com, Jonathan Watt [EMAIL PROTECTED] wrote:
Perhaps something like
var hasNativeSVG =
document.createElementNS('http://www.w3.org/2000/svg','svg').viewBox ?
true : false;
will do what you want? If the implementation doesn't support SVG, then
the element it creates won't have a 'viewBox' property. There's
probably a lighterweight way of doing this, but I haven't thought
about it too deeply. ;-)
On 7/23/05, jophof007 [EMAIL PROTECTED] wrote:
Hi,
Does anyone has a solution on detecting native svg support. Deer park
Alpha 2 supports native svg. How can a client javascript detect that
deerpark alpha 2 is running or how can a client javascript detect that
native svg support is available?
We like to make our diagram editor native svg compliant in
open-modeing (http://open-modeing.sourceforge.net).
Thanx in advance.
John
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Re: [svg-developers] Re: Detect native SVG support
Hi John,
Mozilla has supported the 'viewBox' property for a long time, but
let's forget about that. It would actually be better to use a property
that will almost certainly be implemented - the 'width' property seems
like a good candidate. So you would use:
var hasNativeSVG =
document.createElementNS('http://www.w3.org/2000/svg','svg').width ?
true : false;
I'm not sure I can explain why this should work any clearer than I
already have, but here goes. If the implementation doesn't support
SVG, then the element that's created as a result of the
createElementNS call *won't* have a 'width' property. If the
implementation does support SVG, then the element that's created as a
result of the createElementNS call *will* have a 'width' property.
This seems like a good way to test for native SVG support to me. If
you don't think so, can you have a go at explain why?
Regards,
Jonathan
On 7/27/05, jophof007 [EMAIL PROTECTED] wrote:
Hi,
Sounds as a solution. But Mozilla is trying to implement zoom and pan
things so a viewbox will appear in future I think.
It is not that easy to determine.
John
--- In svg-developers@yahoogroups.com, Jonathan Watt [EMAIL PROTECTED]
wrote:
Perhaps something like
var hasNativeSVG =
document.createElementNS('http://www.w3.org/2000/svg','svg').viewBox ?
true : false;
will do what you want? If the implementation doesn't support SVG, then
the element it creates won't have a 'viewBox' property. There's
probably a lighterweight way of doing this, but I haven't thought
about it too deeply. ;-)
On 7/23/05, jophof007 [EMAIL PROTECTED] wrote:
Hi,
Does anyone has a solution on detecting native svg support. Deer park
Alpha 2 supports native svg. How can a client javascript detect that
deerpark alpha 2 is running or how can a client javascript detect that
native svg support is available?
We like to make our diagram editor native svg compliant in
open-modeing (http://open-modeing.sourceforge.net).
Thanx in advance.
John
-
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[svg-developers] Re: Detect native SVG support
--- In svg-developers@yahoogroups.com, Holger Will [EMAIL PROTECTED] wrote:
jophof007 schrieb:
Does anyone has a solution on detecting native svg support. Deer park
Alpha 2 supports native svg. How can a client javascript detect that
deerpark alpha 2 is running or how can a client javascript detect that
native svg support is available?
or you might check for the support of inlined SVG, this works in
mozilla and opera.
?xml version=1.0?
html xmlns=http://www.w3.org/1999/xhtml;
head
/head
script
function testSVG1(){
var svg=document.getElementById(testSVG)
if(svg.namespaceURI==http://www.w3.org/2000/svg;){
alert(your broser supports inlined SVG)
}
}
/script
body onload=testSVG1()
svg id=testSVG xmlns=http://www.w3.org/2000/svg/
I don't think that test above will tell you whether the browser
supports inline SVG, all you do is checking the namespaceURI property
of an element node in an XML document using elements in different
namespaces, any W3C DOM Level 2 implementation should do that whether
it knows about SVG or not. And you kind of check whether the browser
implements getElementById on that svg id=testSVG element but if
that is the intension then you should check the result of the
getElementById call before trying to access it as otherwise you can
create a script error.
For instance Opera 7.50 when served the above as application/xhtml+xml
will show the alert while it certainly does not know to render SVG.
Mozilla 1.7 does not show the alert but not because the test with the
namespace is any good to detect SVG support but because the
getElementById does not return an object but null and then the next
line gives a script error.
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Re: [svg-developers] Re: Detect native SVG support
Martin Honnen schrieb:
--- In svg-developers@yahoogroups.com, Holger Will [EMAIL PROTECTED] wrote:
jophof007 schrieb:
Does anyone has a solution on detecting native svg support. Deer park
Alpha 2 supports native svg. How can a client javascript detect that
deerpark alpha 2 is running or how can a client javascript detect that
native svg support is available?
or you might check for the support of inlined SVG, this works in
mozilla and opera.
?xml version=1.0?
html xmlns=http://www.w3.org/1999/xhtml;
head
/head
script
function testSVG1(){
var svg=document.getElementById(testSVG)
if(svg.namespaceURI==http://www.w3.org/2000/svg;){
alert(your broser supports inlined SVG)
}
}
/script
body onload=testSVG1()
svg id=testSVG xmlns=http://www.w3.org/2000/svg/
I don't think that test above will tell you whether the browser
supports inline SVG, all you do is checking the namespaceURI property
of an element node in an XML document using elements in different
namespaces, any W3C DOM Level 2 implementation should do that whether
it knows about SVG or not. And you kind of check whether the browser
implements getElementById on that svg id=testSVG element but if
that is the intension then you should check the result of the
getElementById call before trying to access it as otherwise you can
create a script error.
For instance Opera 7.50 when served the above as application/xhtml+xml
will show the alert while it certainly does not know to render SVG.
Mozilla 1.7 does not show the alert but not because the test with the
namespace is any good to detect SVG support but because the
getElementById does not return an object but null and then the next
line gives a script error.
Hi Martin
mmh yes it seems your are completely right, it was just an idea, i admit
a bad one.
maybe the best way is to test for interdocument communication abilitys
(SVGDocument / window)
like:
http://jwatt.org/svg/demos/scripting-across-object.html
http://jwatt.org/svg/demos/scripting-across-embed.html
cheers
Holger
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