Is there a way to check if a file exists in Javascript?
This is what I'm trying to do:
if(thisfile.htm exists)
do this
else
do that
This is what I'm trying to do:
if(thisfile.htm exists)
do this
else
do that
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Re: Check if file exists in Javascript
newcomer said:[color=blue]
>
>Is there a way to check if a file exists in Javascript?
>This is what I'm trying to do:
>if(thisfile.ht m exists)
> do this
>else
> do that[/color]
Whether or not you can do something
in Javascript
in Javascript on a server
in Javascript in a Windows Scripting Host shell
in Javascript in all commonly used browsers
or
in Javascript in a particular version of a particular browser
Are all different questions. Which do you mean?
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Re: Check if file exists in Javascript
On 4 Mar 2004 07:59:00 -0800, michellesmith13 4@hotmail.com (newcomer)
wrote:
[color=blue]
>Is there a way to check if a file exists in Javascript?
>This is what I'm trying to do:
>if(thisfile.ht m exists)
> do this
>else
> do that[/color]
Client side, no there isn't under the standard security model. AFAIK
it can be done with Internet Explorer provided the user allows an
ActiveX control to run, but I certainly wouldn't!
Paul
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Re: Check if file exists in Javascript
newcomer wrote:[color=blue]
> Is there a way to check if a file exists in Javascript?
> This is what I'm trying to do:
> if(thisfile.htm exists)
> do this
> else
> do that[/color]
I do not believe it is possible - however you could cheat - there is a
method to preload an image without actually displaying it - and one can,
after the image has downloaded, check its size before displaying it.
Thus... one could try and test for an html file as opposed to an image
file - Give it a few seconds wait before checking the size of the html
file and if its greater than zero, the page is likely to exist.
I say likely in such that you might find that sometimes the page is
being read from a proxy cache somewhere. One method around this might
be to append arguements to your requested html file, like a time stamp.
Thus, request whatever.html?1 3451324345 - This *might* mean that your
request comes from the original server as opposed to a copy that might
exist on a users proxy.
There are alot of mights there - I'm a newbie with javascript, but I
come from a Unix/Linux background which provides many solutions to a
single problem - Its thought me to think this way with javascript.
The following code is untested - again - I'm a newbie so someone else
might be able to clean it up a little/lot...
function checkIfRemoteFi leExists(fileTo Check)
{
var tmp=new Image;
tmp.src=fileToC heck;
if(tmp.complete )
{ window.alert(fi leToCheck+" is available"); }
else
{ // Not got it yet - retry for a few seconds...
window.setTimeo ut('checkIfRemo teFileExists(fi leToCheck)', 1000);
}
}
checkIfRemoteFi leExists('http://www.where-ever.com/abc.html');
I hope something above helps steer you in the right direction,
randelld
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