The example coding is not work. https://support.wix.com/en/article/velo-about-validating-user-input-with-code

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Property ‘endsWith’ does not exist on type ‘string | boolean | File[]’. Property ‘endsWith’ does not exist on type ‘false’.

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@cora-kwok

endsWith only works with string property.

It is possible if you are doing validation with the uploadButton / checkbox / boolean elements, hence, it is normal that this error shows up.

As long as you are using endsWith with text elements only, the code still works.

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What your meaning is that input textbox is not with String property,
so it is not valid for a text box.