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I would want the function to detect whether there is text in a text field typed in by a user. Not necessarily keyup. I wouldn't want it to fire every time I type in the field. I would want it to detect whether there is text in the field or not.

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    Do you mean the input event? Commented Jun 1, 2016 at 15:55

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html <input> tags including type='text' support the onchange event. The onchange event occurs when the value of an element has been changed.

I wouldn't want it to fire every time I type in the field.

in this case, when exactly would you want it to be triggered? onblur event occurs when an object loses focus.

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for me it's the proper way wait that the element have really change and after check the lenght or the value to determine if it's empty or filled
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You have 2 another events like 'blur' or 'focus'

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