How do i clear textBox contents when checkBox is unchecked

[Sino87]

function getCurrentDateString(checkBox, inputName){
    if(checkBox.checked == true){
        var inputBox = eval("document.PortfolioInquiryChange."+inputName);
        if(inputBox.value==""){
            var dateobj= new Date();
             var month = dateobj.getMonth();
             var day = dateobj.getDate();
             var year = dateobj.getFullYear();
            inputBox.value= day + "/" + month + "/" + year;
        }
 
    }
    else{ 
        inputBox.clear();
    }
 
}

[Dormilich]

you simply set the value to an empty string (there is no clear() method on form fields). you may also call the reset() method of the form, although that will reset all form elements.

PS. don’t use eval() on line #3, bracket notation will do.