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check whether the text box is filled with value or not

 
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hi ,
i have a form which contains text boxes.
If user fills some text boxes and click any link (which goes to previous page etc), a pop up should be displayed warning the user that he had already filled some text boxes and moving to the clicked link will discontinue the registration he is doing.

i am able to check whether the user had changed the data in text boxes using onchange but i need some function to check whether the text box is already having some value (then also it should show the pop up).

Please advice.
thanks in anticipation.
[ April 26, 2007: Message edited by: Bear Bibeault ]
 
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Iterate through the elements looking for text boxes with a non-empty value.
[ April 26, 2007: Message edited by: Bear Bibeault ]
 
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