Chart & Visualization Issues

How to Remove Conditional Tick Marks in Deneb Vega-Lite Charts

Emma Brown Sep 30, 2026 869 views

Question details

The user wants to remove or hide tick marks on the axis of a Deneb Vega-Lite chart when there is no corresponding axis label displayed.

How to Remove Conditional Tick Marks in Deneb Vega-Lite Charts

Product: Power BI / Deneb Vega-Lite
Device & OS: not provided
Scenario: Creating custom data visualizations using the Deneb custom visual in Power BI, where axis labels are conditionally hidden using expressions.
Observed behavior: Conditional label expressions successfully hide the text labels, but the tick marks remain visible on the axis where no label exists, causing a visual misalignment.

Before you start

Copy your current Vega-Lite JSON specification into a plain text editor before adjusting the axis configurations, ensuring you have a backup if the visual breaks during editing.

Solution 1Recommended

Configure Conditional Axis Encoding Separately

Use specific conditional logic within the Vega-Lite axis properties to synchronize the rendering of tick marks with your text labels.

In Vega-Lite, labels and tick marks are treated as separate visual elements. A conditional expression applied to a label only affects the text string. To completely remove the tick mark, you must configure the tick properties or scale domains directly.

Open Deneb Advanced Editor

Navigate to your Power BI report canvas, select your custom visual, and click on the 'Edit' button to open the Deneb Advanced Editor.

Locate the Axis Configuration

Scroll through your JSON specification to find the 'axis' object nested within your 'x' or 'y' encoding block.

Apply Tick Configuration

Instead of only using 'labelExpr' to hide text, modify properties like 'tickCount', 'values', or conditionally adjust the 'tickSize' property to ensure tick marks do not render where labels are absent.

Apply and Verify Changes

Click the 'Apply' button in the Deneb editor. Check the visual preview to ensure that gridlines, labels, and ticks are now properly synchronized and aligned.

Configure Conditional Axis Encoding Separately

Understanding Vega-Lite Logic: Because labelExpr only evaluates the text output, an empty string still technically constitutes a label, meaning the tick mark will still be drawn by the rendering engine.

Solution 2

Seek Specialized Community Assistance

Because the exact expression heavily depends on your specific data and chart specification, consulting the Power BI community can provide an exact JSON fix.

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Frequently Asked Questions

Why do tick marks appear without labels in Vega-Lite?

In Vega-Lite, labels and tick marks are separate visual components rendered independently. A conditional expression that hides a label only affects the text string itself, leaving the underlying tick mark rendered unless explicitly hidden.

Can I use the labelExpr property to remove tick marks?

No, the labelExpr property is used solely to format or conditionally render the text of the axis labels. To remove tick marks, you must adjust specific tick properties, such as tickSize or tickCount, or manually define the axis values.

Where can I find examples of Deneb axis configurations?

You can find example JSON configurations in the official Vega-Lite documentation, on the official Deneb website, or by searching the Power BI Community galleries for custom visual templates.

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