Re: Flag checking
This WebDNA talk-list message is from 2000
It keeps the original formatting.
numero = 32231
interpreted = N
texte = This is basically working against the grain of _all_ CGI programs. HTTP is stateless by nature (a given page can be displayed once a second or once an hour or in a random order). CGI programs are never suitable for realtime programming, due to the latency in the web and the reliance on the client to request the next page (rather than the server pushing an updated page). In addition, if you set a page for 1-second refresh, you will completely hose anyone with a slow link (since the page will not finish loading before it tries to reload).Perhaps if you described what you are trying to accomplish, we can give you some suggestions for other ways to accomplish it. If you are trying to provide some kind of secure login checking, with automatic logout based on some kind of external criteria, your are trying to do something that plain HTTP will never work well with. You will have to move to a true client-server development (maybe with Java).John PeacockJeff Homan wrote: > > This my first message to this group, so bear with me... > > I need to check for a flag in a database, when that flag is found, I > need to update the screen by refresh or reload or even redirect. The > problem that I am having, is that I need to check for this flag every > one or two seconds. I have no problem with using javascript, it's just > that currently I am stumped with what I can do. > > My only idea is this: > > -Set a loop (I'm not sure how many times per second the loop runs > though) > -Check the database in a showif > -If the flag is found, redirect the page to itself > > Does this sound reasonable, or does someone else have a better idea? > > Thank you, > Jeff Homan------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list
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This is basically working against the grain of _all_ CGI programs. HTTP is stateless by nature (a given page can be displayed once a second or once an hour or in a random order). CGI programs are never suitable for realtime programming, due to the latency in the web and the reliance on the client to request the next page (rather than the server pushing an updated page). In addition, if you set a page for 1-second refresh, you will completely hose anyone with a slow link (since the page will not finish loading before it tries to reload).Perhaps if you described what you are trying to accomplish, we can give you some suggestions for other ways to accomplish it. If you are trying to provide some kind of secure login checking, with automatic logout based on some kind of external criteria, your are trying to do something that plain HTTP will never work well with. You will have to move to a true client-server development (maybe with Java).John PeacockJeff Homan wrote: > > This my first message to this group, so bear with me... > > I need to check for a flag in a database, when that flag is found, I > need to update the screen by refresh or reload or even redirect. The > problem that I am having, is that I need to check for this flag every > one or two seconds. I have no problem with using javascript, it's just > that currently I am stumped with what I can do. > > My only idea is this: > > -Set a loop (I'm not sure how many times per second the loop runs > though) > -Check the database in a showif > -If the flag is found, redirect the page to itself > > Does this sound reasonable, or does someone else have a better idea? > > Thank you, > Jeff Homan------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list . To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to Web Archive of this list is at: http://search.smithmicro.com/
John Peacock
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