how to link the chosen elements from the lists

[Petros Efstathiou]

hello ! i am trying to make a app about coktails . i made lists with ingredients and now i wanna make a button and when i push this button will link the ingredients (which i have selected from the lists previous) and show the cocktail which is made
for example: listpicker1 elements are vodka, beer, whisky,wine and listpicker2 elements are champagne, liquerus,martini,sangria
and we have a button with the name "MIX" . i want  when i pick ''vodka'' from listpicker1 and ''martini'' from listpicker2 and press the ''MIX'' button , to show me the cocktail ''BLOODY MARY'' in an another screen .
sorry for my english ! if anybody knows plzz help me

[Tim Carter]

There are probably many easier ways to do this, and a better AI2 programmer than i may come along with a better solution, but this example should give you an idea of what you need to do:

I only used one list for ingredients, and the first and second selections are removed from the second and third listpickers. I didn't include any three ingredient examples. You can use "start value" or a tinydb to transfer the "MIX" output to another screen.

[Petros Efstathiou]

thank you very much !!! i will try this way !! 

[Abraham Getzler]

How could any app get BLOODY MARY from vodka and martini?

I would expect it to get vodka martini

There is no tomato juice in vodka or martini.

Could you pick a working example?

ABG

[Petros Efstathiou]

i think the ingredients taken in luck (its only an example)  !! :) 

[Abraham Getzler]

I'm trying to understand what questions your intended app should answer.

Would I be correct if I guessed that it lets the user choose from lists

of ingredients, as many as he wants, and at each step lists only

the recipes that contain ALL of those ingredients?

Then after a recipe name is chosen from the filtered recipe list, that recipe is

displayed in detail?

By the way, encoding your recipes in list blocks might be okay for  only

a handful of examples, but to grow into a useful and large collection you will need

a way to encode recipes in data file(s) and load them as csv (or JSON) data.

See here for sample data file loading techniques ...

https://drive.google.com/open?id=0B5Xr7cVb-tYqdGJMbXNiU1V5ZlU

https://drive.google.com/open?id=1TRGypmOaRvK37oazCuaGBdXzvt4dzzGXaHYvp22ueCs

(The files they load are csv tables, but the problems they solve have no relation to yours,

so don't bother reading them past the point where the files are loaded thru a csv conversion block.)

ABG

[Petros Efstathiou]

Yes that was my thought. Do you think if I want to use more ingredients and recipes I have to use your way ; ( btw what's Abg?) thanks for your advice!

[Abraham Getzler]

See this doc for how to load a table from a file uploaded to the Media drawer.

https://drive.google.com/open?id=1S8eZBKBvtFzafH51a3bKnw_iBVHRnjHaEY1Zbjzscb0

The app simulates a quest finding your way from the Big Bang to MIT,

in a dozen steps or so.

If you can divide the universe of cocktail recipes into non-intersecting groups

and subgroups of recipes, you could use the blocks as is, with your own recipe file built to

the same structure as my Universe file.

My initials are

ABG

[Petros Efstathiou]

Thanks!!! :)

[Abraham Getzler]

For fun, I coded up the app with a few recipes (some fake),

and put it on the Gallery at

ai2.appinventor.mit.edu/?galleryId=5120380011020288

Here's a recipe I forgot to include:

Putin On The Ritz:

 Vodka 

 Ritz Cracker

(Not my invention).

ABG

[Petros Efstathiou]

Thank you for your help!!!

[Abraham Getzler]

It occurred to me that I might have solved the wrong problem.

I solved the problem of WHICH RECIPES REQUIRE ALL MY SELECTED INGREDIENTS.

A more useful question would be:

Given a list of recipes, and a list of ingredients in stock versus out of stock,

what are the names of the recipes I can make using only ingredients I have in stock?

Is that closer to your question?

ABG