How to get control of text field when text is entered

HI ,

I have a text field and dropdown on my jsp , when user enters text on this text field then dropdown filed on this pages should be visible ,

If the text field is left empty then the dropdown should not be invisible .

How do i know text field value after user enters text .

I use below but not able to . Is this right way or missing anything .

<dmf:text name="textone" defaultonenter="true" onchange="getTextChange"/>

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You'll need to use the javascript onkey* event(s) to implement this.

Attach this event to your text filed via javascript on page load.

Thanks for your reply .

Can you please provide me the js function how to achive this .

I want to enable control on the page only when user enters text on the text field .

If i get vlaue of the text control in js function ,

how can i make visible and invisible of the other control on the jsp page based ont the text value .

Any help would be highly appriciated