Why Am I Getting Empty String Passed to getElementByID() Error in My JavaScript Code?

Why Am I Getting Empty String Passed to getElementByID() Error in My JavaScript Code?

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Why Isn't the Alert Showing When the Input Field Is Empty in My JavaScript Function?
Why Isn't the Alert Showing When the Input Field Is Empty in My JavaScript Function?
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JavaScript Alert Always Showing "No Value"? Here's Why

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