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How can I compare price from store1 and store2? do i use javascript for that?
I want it to display in a list, so every list will show the lowest item by changing highlighting the font to red or green color. in the picture are the sample of database and below picture are the sample output

Due to you are using a list service,
you can store the difference between two prices (Compare price from Sotre 1 and 2) in the localStorage and show it as a label.
code
var price1=Apperyio('Price1').text();
var price2=Apperyio('Price2').text();
localStorage.setItem("Compare",price1-price2);
Apperyio('Compare_Label').text(Compare);/code

what if I want to compare more than 3 prices?

localStorage.setItem("Compare",price1-price2-price3-price4-price5);
Apperyio('Compare_Label').text(Compare);

is that correct?

I tried to run the script but error - "Uncaught ReferenceError: Compare is not defined"
came out

"Uncaught ReferenceError: Compare is not defined" happened probably because you didn't have a storage variable called "Compare"
"Compare" is a local Storage variable which you use and fill the name of that variable in "Compare"
If you don't understand, then just create an variable called "Compare" at "Model and Storage" at "App Settings" in App Editor

Sorry, I think I misunderstand your request (or maybe you change it)
So I change the code a little bit,
code
var price1=Apperyio('Price1').text();
var price2=Apperyio('Price2').text();
if (price1-price2 >0){
Appery('Price1').css("color", "red");
}
else{
Appery('Price2').css("color", "red");
}

/If Price 1 smaller than price 2, then answer will be negative/
/code

I created at Model and Storage a variable called 'Compare' below are my coding:
var p1=Apperyio('price1').text();
var p2=Apperyio('price2').text();
var p3=Apperyio('price3').text();
var Compare = Apperyio('Compare');

localStorage.setItem("Compare",p1-p2-p3);
Apperyio('compareLabell').text(Compare);

There is no more error but output still blank.

it works but only for the first item list..

Remember, P1-P2-P3 will give you negative answer
(1 price minus 2 prices)
Check out the new code I've post below, ignore the code with /If Price 1 smaller than price 2, then answer will be negative/

Figuring it out, ASAP(Because I'm not an employee!)
At this time, you may want to check out this link:
https://devcenter.appery.io/documenta...

Easiest Way and Stupiest Way XD
This is for 3 prices comparing
If you want to do it on list item put them on the mapping JS
var p1=Apperyio('price1').text();
var p2=Apperyio('price2').text();
var p3=Apperyio('price3').text();
code
if (price1<price2) {
if (price1<price3) {
Appery('price1')&#46;css("color", "red");}}

if (price2<price1) {
if (price2<price3) {
Appery('price2')&#46;css("color", "red");}}

if (price3<price1) {
if (price3<price2) {
Appery('price3')&#46;css("color", "red");}}/code