Browser Back button

[croydon]

Could someone please tell me how I can simulate using the Back button in IE. I want to give users the option to go to the previous page, either to re-start with a clean selection or modify the existing selection (i.e. the Back button).

From what I have read, the answer seems to be to use ("javascript:history.go(-1);"), but I can't seem to get this to work from my button.

I am using VB.NET

Thanks for your help.

 

[ca8msm]

You can add that javascript (which is correct by the way) by adding it to the OnClientClick event of the Button:

http://msdn2.microsoft.com/en-us/library/system.web.ui.webcontrols.button.onclientclick.aspx

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[croydon]

Thanks ca8msm. I tried this but I had no OnClientClick event on my asp button. I then found an article that said this event is only available in the 2005 version of VB.NET.

Is that correct? I am using VS.NET 2003.

 

[ca8msm]

Yes, that is correct - it is only available in version 2.0 of the framework.

For your older version, try using the Attributes.Add method of the Button and add a javascript "onclick" event.


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[croydon]

ca8msm, I think I have the answer.

In my row of buttons, instead of using a web form button for this function I have used an HTML button.

There is no other functionality required other than re-displaying the previous selections and (unless I'm missing something) this seems to work ok.

 

[ca8msm]

Yes, you can do that as well (either method will work). You may also wish to consider a server-side solution in case your users don't have javascript capabilities.


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[Olavxxx]

Hi, this should work fine:

<input type="button" onclick="history.go(-1)" value="Return" />

I dont know asp.net's refferer server variable, but if you google for it, I guess you can easilly make some serverside-redirect, based on refferrer.

Be aware though, that not always the server will be availible to detect the refferer (depends on browser).

You could trick this by using sessions, database-sessions, etc. But it all depends: How important is this function for you? Are you willing to use a lot of time on this? If not, dont care about the users who dont have JS. They can press the back-button in theire browser instead - if you ask me!

Dont use JS for vital functions, like password/authentication, etc. as it will reveal your logic for your users. It will also allow bypass/manipulation at a higher grade than server-side validation/control.

Anyhow, I recommend JS for "helping users", but always let there be some kind of backup-alternative way of using your pages.

Olav Alexander Mjelde

http://www.volvo-power.net

Admin & Webmaster