| http://www.w3.org/ns/prov#value | - g any data in the form to indicate that we need to save the data before leaving from the page.-call a function when clicking any link in the page to give warning/alert message based on the Boolean flag value.Find below the sample javascript code.var ischanged;//This variable used as flag to check whether user clicked submit button or notfunction initialize_ischanged()//this function triggered when
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