javascript - How do I check form elements in HTML before the form has been submitted? -

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I am using PHP to validate and run my form, however, I want to see the elements because they are filled Are there. How do I check an element for my current value before submitting the form? Document collection is a collection of forms, elements of form control have DOM properties like

, checked , selected and therefore their respective interfaces (e.g.,) can be compared to allowed values ​​and categories.

There are so many questions and articles on this topic. Search for form validation, one go, ask questions.

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