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YesSoftware Forums -> CodeCharge Studio -> Tips & Solutions

 PHP Tip: Redirecting to a "previous" page.

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lvalverdeb

Posts: 299
Posted: 10/12/2004, 10:02 AM

In a project I am currently working on, I have several forms with grid lists that need to point to a single maintenance form. Basically that meant that I had to dynamically modify the $Redirect global variable in the maintenance form to return to the appropriate calling form.

I utilised the following 4-function solution and one session variable. These are the steps to implement this functionality;

1) Copy functions below to Common.php or a function library included in your project.

2) Set the "previous" or calling page. Call the following function in the AfterInitialize event of the calling page.

setAsPrevPage();


2) In the Unload Event (at least that what works for me) of the maintenance page (or whatever page you are calling), use the following function:

   
  
redirectToPrevPage();  
  

3) On some forms I needed to add this same functionality to a "Return to Prior Page" link. In the AfterInitialize event of the "called" form:

   
global $YourForm;  
setLinkToPrevPage($Path->To->Your->Return->Link);  
e.g. setLinkToPrevPage($Link1);  
        or setLinkToPrevPage($YourForm->Link1);  
  

And that is all there is to it.

I realise similar behaviour can be implemented using JavaScript but I prefer a PHP solution.

All the best

Luis

Here are the required functions:

function setAsPrevPage($PageName="")  
{  
	if (!strlen($PageName))  
		$PageName = getenv("SCRIPT_NAME");  
	$QueryString = CCGetQueryString("QueryString","");  
	if ($QueryString !== "")  
		$PageName.="?".$QueryString;  
	CCSetSession("sPrevPage",$PageName);  
}  
  
function redirectToPrevPage()	{  
	global $Redirect;  
	$Redirect = getPrevPage();		  
}   
  
function getPrevPage()  
{  
	$QueryString = CCGetQueryString("QueryString", "");  
	$retPage = CCGetSession("sPrevPage","");  
	return $retPage;  
}  
  
function setLinkToPrevPage(&$lnkRef)  
{  
	$prevPage = getPrevPage();  
	if ($prevPage == null)  
		$prevPage = getenv("HTTP_REFERER");  
	$lnkRef->SetLink($prevPage);  
	return $lnkRef;  
}  

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lvalverdeb
CR, GMT-6
XAMPP/Ubuntu/CCS3.2/4
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SteveG

Posts: 56
Posted: 02/06/2005, 9:40 PM

Thanks for the great help. I tried to do the redirecting the CCS way through passing/removing parameters; but after a few days of frustration, I'm using your session variables way. Just to add my own techniques to this post, I've got three forms on my page, Add_Record, Edit_Record and Delete_Record; of which I hide two. Each form has a cancel button, which calls my Redirect_to_Previous_Page() function as does the AfterExecuteUpdate and the AfterExecuteInsert. The AfterExecuteDelete needs a special condition, as I didn't want to go back to the page that called it if there was nothing left to show:

global $Record_Delete;
// If coming from the one-up page of this discussion, don't return to empty grid, but go to another page:
if (0 < strpos(Get_Previous_Page(), '&subjtype=2')) { // Indicates page I don't want to go back to.
global $Redirect;
$Redirect = 'Discussions.php?subjtype=1&areaid='.$Record_Delete->areaid->GetValue(); // Calls another page using hidden field values.
} else {
Redirect_to_Previous_Page();
}

... by the way, I took out the second " $QueryString = CCGetQueryString("QueryString", "");" line in your getPrevPage function, I wasn't sure that it needs to be there, and so far the function still works well.

- Steve
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SteveG

Posts: 56
Posted: 02/06/2005, 9:55 PM

Oh yeah, I forgot, here's the code I use when I add a new record (why return to previous page when there's a new record to mess around with):

global $Redirect;
$Redirect = 'Discussions.php?subjtype=2&discussionid='.mysql_insert_id();
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lvalverdeb

Posts: 299
Posted: 02/16/2005, 11:09 AM

Cheers Steve. I am glad the post gave you some pointers. Also, you are right about the second $QueryString = CCGetQueryString("QueryString", ""); in the getPrevPage() function. It is not needed at all. Hence, the function would just be:
  
function getPrevPage()  {    
 return CCGetSession("sPrevPage","");    
}    

Luis
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lvalverdeb
CR, GMT-6
XAMPP/Ubuntu/CCS3.2/4
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