# Variable dictionary / map? populate value based on selected keys in form?

**URL:** <https://www.finalbuilder.com/forums/t/variable-dictionary-map-populate-value-based-on-selected-keys-in-form/6994>\
**Category:** Feature Requests\
**Tags:** implemented\
**Created:** [March 3, 2021, 11:56am UTC](https://www.finalbuilder.com/forums/t/variable-dictionary-map-populate-value-based-on-selected-keys-in-form/6994 "2021-03-03T11:56:42Z")\
**Posts on this page:** 1\
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**Author:** ![Sparky](https://www.finalbuilder.com/forums/user_avatar/www.finalbuilder.com/sparky/32/10_2.png) [@Sparky](https://www.finalbuilder.com/forums/u/Sparky)\
**Post date:** [March 4, 2021, 5:30am UTC](https://www.finalbuilder.com/forums/t/variable-dictionary-map-populate-value-based-on-selected-keys-in-form/6994/2 "2021-03-04T05:30:33Z")

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Hi @ktopaz,

We are planning to add a new field to `Dropdown Selection` variable prompt so that you can specify labels and values. This will allow the use to select a label, e.g. the channel name, but the variable gets set to another value, e.g. the channel URL or a variable which expands to the channel URL.

Meanwhile, there are a couple of options:

1. Use `If` and `Else` actions along with `Set Variable` actions to set a new variable based on the value of the key variable e.g.

![image](https://www.finalbuilder.com/forums/uploads/default/original/2X/f/f81a5de8394864831b0da6d0bdd485456c6807b5.png)

1. Add a number to the start of each of the keys and use this number to select a item from a list in another variable. e.g.

With the following variables:

![image](https://www.finalbuilder.com/forums/uploads/default/original/2X/2/21fd0fa6efafe897bbf734eb421ed7c64d909ded.png)

![image](https://www.finalbuilder.com/forums/uploads/default/original/2X/5/50b7e4e7803c2911b5d416a1c70eff7e81273095.png)

This expression will select a line from the `Urls` variable matching the value selected for the `Key` variable:

```auto
$Utils.GetString(%Urls%).Split("\n").Item( $Utils.GetString(%Key%).Remove(1).ToNumber().Decrement()$)$

```

To explain:

`$Utils.GetString(%Key%)` gets the Key variable to a string that we can work with,  
`.Remove(1).ToNumber()` we then remove all but the first character which is taken as a number,  
`.Decrement()$` and decremented to a zero based index.

`$Utils.GetString(%Urls%)` gets the Urls variable to a string that we can work with,  
`.Split("\n")` then splits this string into an array of lines,  
`.Item( $Utils.GetString(%Key%).Remove(1).ToNumber().Decrement()$)$` and we then select the item from that array for the index generated from the Key variable

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