<%= %> embedded in Javascript IF Condition

Question

In aspx page:

if (<%= Not Me.ThisVisa.PassportExpirationDate.IsNull %>){   

Returns error:

Microsoft JScript runtime error: 'True' is undefined

I tried this:

if ("<%= Me.ThisVisa.PassportExpirationDate.IsNull.ToString %>" != "True"){   

..but I get a compile time error:

Error   5   Option Strict On disallows implicit conversions from 'String' to 'Long'

Help!

Answer 1

What about:

if (<%= (Not Me.ThisVisa.PassportExpirationDate.IsNull).ToString().ToLower() %>){  

This will evaluate the Boolean condition and convert it to a string, but you should lower-case it so it looks like JavaScript syntax when it's rendered.

Answer 2

Get rid of the extra spaces. Change to:

if ("<%=Me.ThisVisa.PassportExpirationDate.IsNull.ToString%>" != "True"){

Answer 3

You are missing the parenthesis for the ToString() method.

update: sry, my bad

Answer 4

Consider moving the logic into the server script. Doing so will reduce how much JavaScript you emit onto the page.

<% If Not Me.ThisVisa.PassportExpirationDate.IsNull Then %>

// JavaScript Goodness

<% End If %>