Problem with IF ... statement

tickled_pink

Following on from my previous thread, I've finally discovered what the problem is.

The script in question is a simple database viewer and editor. The screen has several buttons including 'Previous' and 'Next' which allow the user to go to the previous and next records in the database.

The $appno variable holds the present record number. It's incremented when the 'Next' button is pressed and decremented when 'Previous' is pressed.

Now it seems that the problem I mentioned in my previous thread doesn't actually exist. The problem is that $appno won't go any higher than '2' when I press 'Next'. I've just discovered that for some reason, it's going into the IF ($previous) ... section first instead of just going into the IF ($next) section, which it's going into next - so it's decrementing $appno and then incrementing it, meaning it's stuck on '2' when I press 'Next'.

Any idea what might be going on?

bad76

Hi,
the php cannot know what button is pressed.

Try to change value for $appno using url:

Now you have only to check if $appno+-1 are too valid value...

tickled_pink

Since I wanted to use the buttons, I tried the following fix ...

The original code looked like this:

//Check if 'previous' button has been pressed
	if ($previous)
	{
		if ($appno > 1)
		{
			$appno--;

The new code looks like this:

//Check if 'previous' button has been pressed
	if ($previous)
	{
		if ($appno > 1 && !$next) //To fix a weird problem when user presses 'next' button
		{
			$appno--;

This way, even if the script goes into the IF statement when it shouldn't (i.e. when the 'Next' button is pressed), the extra check means that it won't execute anything within the boundaries of the IF statement.

The strange thing is that all the other buttons, including 'Previous' are detected and work properly. The only problem is with the 'Next' button.

😕

Anyway, this method works fine.