Two fields on a page - Best way to replace old field value with another one

[nfil]

Hello,

I have some doubts about what should be the best way to replace and output a value, replacing another one.

So I have two fields on a page, one with the old value and another with a new one, need to keep a old value in the backend and render the new one in the frontend and the old value would be blotted out.

Thank you for your help.

[Macrura]

could you explain more? i'm not really getting what you're trying to do...

[nfil]

Hello Macrura. Modified this from the skyscrapers profile to render the field for the current price (old value):

$out .= ($product->sc_price ? number_format($product->sc_price) . " €" : $na);

Then I created a new field sc_price_drop on a product template with a new price, how do I output the new price and show the old price blotted out?

Found this post that should relate to what I want to achieve, Diogo's and Nik's examples would be a way to replace a value with a new one, using selectors?

http://processwire.com/talk/topic/4860-selector-match-that-mixes-multiple-fields/?hl=replace#entry47228

thanks.

[Macrura]

you mean like this?

if($product->sc_price_drop) {
	$out .=  '<del>' . $product->sc_price . " €</del>"; 
	$out .= number_format($product->sc_price_drop) . " €";
	} else {
	$out .= ($product->sc_price ? number_format($product->sc_price) . " €" : $na);
}

[nfil]

thanks! Had some syntax error when I changed the function, now I have this:

$out .= "\n\t\t<td>"; 
	if($product->sc_price_drop) {
	$out .=  '<del>' . $product->sc_price . " €</del><br/>"; 
	$out .= number_format($product->sc_price_drop) . " €";
	} else {
	$out .= ($product->sc_price ? number_format($product->sc_price) . " €" : $na) . "</td>";
	}
	$out .= "\n\t\t<td>" . ($product->sc_sku ? $product->sc_sku : $na) . "</td>";

It works fine don't know if I should use the variable out with a dot before the equal sign (newbie question).

 

I made other site with different roles but in that case I had a template to lock pages to unregistered users, this case is different. 

This time what would be the best way to output a field value only to a group of users with a role named retailer?

Create a field named sc_price_retailer on the page with the other price values and the new sc_price_retailer field, then when a user logs in with a retailer account they can view the only sc_price_retailer field value. Would that be possible?

[diogo]

It works fine don't know if I should use the variable out with a dot before the equal sign (newbie question).

The dot concatenates the strings from left and right of the operator:

$string = "Team"; // "Team"
$string .= " Building"; // "Team Building"
$string .= " Exercise"; // "Team Building Exercise"
$string .= " '99"; // "Team Building Exercise '99"
 

So, in your code you have to use the dot, except on the first $out assuming that the variable is empty. If the $out comes from previous code and is already populated,  then you should keep also that dot.

[nfil]

Diogo the logic makes sense. Only used the dot on the same line of the variable but the function is correct there is a populated $out before those.

That was a very nice tutorial on php syntax for beginners like me. Thanks for de detailed explanation of the logic. 

Still wonder what should be the best option for this:

I made other site with different roles but in that case I had a template to lock pages to unregistered users, this case is different. 

This time what would be the best way to output a field value only to a group of users with a role named retailer?

Create a field named sc_price_retailer on the page with the other price values and the new sc_price_retailer field, then when a user logs in with a retailer account they can view the only sc_price_retailer field value. Would that be possible?

will have a look here! http://processwire.com/api/selectors/inputfield-dependencies/