Question

I have 3 textboxes to do a check on the entered date. The code I originally had was for one textbox. Is there a way to pass an ID name to the onChange event

<asp:TextBox ID="txtDate" runat="server" Width="110px" onChange="checkEnteredDate('txtDate')"></asp:TextBox>

function checkEnteredDate(var textBox = new String();) {
            var inputDate = document.getElementById(textBox);
            //if statement to check for valid date
            var formatDate = new Date(inputDate.value);
            if (formatDate > TodayDate) {
                alert("You cannot select a date later than today.");
                inputDate.value = TodayDate.format("MM/dd/yyyy");
            }
}

Answer 1

I actually figured it out. I did the following:

...onChange="checkEnteredDate(this)"...

function checkEnteredDate(inputDate) {            
            //if statement to check for valid date
            var formatDate = new Date(inputDate.value);
            if (formatDate > TodayDate) {
                alert("You cannot select a date later than today.");
                inputDate.value = TodayDate.format("MM/dd/yyyy");
            }
}

getElement was messing me up. Thanks for the suggestions, they brought me in the right direction.