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onblur on textbox is executing after closing the popup with X button

 
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Hi,


My problem is
i have validation for empty string entry in a text box for onblur event in a popup
if i place the cursor in the textbox , make no entry in textbox and click on X(close at the right corner) of popup window, its closing the popup and giving the validation alert for the textbox.

but i have to develop as it should prompt the user to enter values in textbox and it should not close the popup.

Can any one please help me regarding this,iam very new to javascript.
 
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You can try looking into onbeforeunload.

Eric
 
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