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The $F() function returns the value of any field input control, like text boxes or drop-down lists. This is a convenience alias of Form.Element.getValue.
The function can take as argument either the element id or the element object itself.
$F(element) |
<html> <head> <title>Prototype examples</title> <script type="text/javascript" src="/javascript/prototype.js"> </script> <script> function ShowValue(){ var value = $F('userName'); alert( 'Entred Value :' + value); } </script> </head> <body> <p>Enter any value in the box and then click "Show Value"</p> <form> <input type="text" id="userName" value="Madisetti, Praveen"> <br/> <input type="button" value="Show Value" onclick="ShowValue();"/> </form> </body> </html> |
To understand it in better way you can Try it yourself.
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