bug(matTooltipDisabled): not working when boolean expression given is like "array.length"

[alessandrospinelli]

Is this a regression?

• Yes, this behavior used to work in the previous version

The previous version in which this bug was not present was

No response

Description

When using matTooltip, passing an expression like "array.length" into [matTooltipDisabled] will be considered true even if array is empty, so the tooltip is always hidden.
Instead with the condition "array.length > 0" matTooltipDisabled works properly.
I don't know if this behavior used to work in a previous version but "array.length" is valid from ages as a boolean condition in angular (also in html)

Reproduction

StackBlitz link: https://stackblitz.com/edit/components-issue-starter-umfckoz3?file=src%2Fmain.html
Steps to reproduce:

1. Hover the button
2. See how no tooltip appears
3. Try to update condition in "array.length > 0"
4. See how now tooltip appears

Expected Behavior

When passing an expression as "array.length" matTooltipDisabled should disable the tooltip only when the array is not empty

Actual Behavior

When passing an expression as "array.length" matTooltipDisabled always disables tooltip

Environment

• Angular: 18.2.8 or newer
• CDK/Material: 18.2.8 or newer
• Browser(s): Google Chrome
• Operating System (e.g. Windows, macOS, Ubuntu): Windows

[andrewseguin]

The input for disabled expects a boolean rather than an expression that is truthy/falsey. I can see the confusion but you are right to use >0 to correctly pass a boolean. Closing since its working as intended