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Learn how to effectively use conditional formatting in `Looker` by referencing another field for your data visualization needs.
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This video is based on the question https://stackoverflow.com/q/72807910/ asked by the user 'mikelowry' ( https://stackoverflow.com/u/11058930/ ) and on the answer https://stackoverflow.com/a/72963607/ provided by the user 'Hung Ho Phan' ( https://stackoverflow.com/u/18231876/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Mastering Looker Conditional Formatting Using Another Field

When working with Looker, one common challenge is applying conditional formatting based on values from another field. This feature is invaluable for creating visually appealing and easily interpretable dashboards. In this post, we’ll tackle a specific scenario: changing the background color of one column based on the related value of another column. Let's dive right into it!

Understanding the Problem

Imagine you want to highlight score values based on their associated labels. For instance, if a label reads "Green," you'd want the background of its corresponding score value to also be green, and similarly for "Yellow" and "Red." This requirement may sound straightforward, but referencing another column (like your score_label_column) correctly in Looker can be tricky due to its strict syntax.

Example Scenario

Score Label Column: This column categorizes scores into "Green," "Yellow," or "Red."

Score Value Column: The column that contains the actual score values you want to format.

Setting Up Your Looker View

To begin, ensure that you have correctly set up the view where your data resides. Here’s a simplified structure to give context to how you can apply conditional formatting in Looker.

[[See Video to Reveal this Text or Code Snippet]]

Key Syntax Insights

One major hurdle you might face is syntax errors, particularly with Liquid syntax in Looker. Since referencing fields correctly is critical, here are some tips:

Spacing Matters: Ensure there is a space between % if and the variable name. This is a common pitfall. For example:

Correct: {% if value %}

Incorrect: {% if value%}

Using the Correct Variable: In your initial attempt, you referenced score_label_column, but that column must be defined beforehand in your view. Instead, adjust your condition based on the dimension you are working with, which in this case is total_score_colored_looker.

Direct Value Comparison: You can also simplify your comparison by directly using the value variable, which represents the current value being evaluated in Looker.

Here’s how your conditional formatting logic should look after adjustments:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following these guidelines, you can effectively implement conditional formatting in Looker using another field. This not only enhances the readability of your data but also makes it much easier for users to interpret important information at a glance.

Don't forget to utilize the correct syntax, define your dimensions and measures properly, and test your conditional statements to avoid errors. Happy Looker building!