[ZPT] Boolean values and state

[Scott Burton]

I am not sure if anyone has noticed it. But if you want to evaluate 
something in a ZPT and change an checkbox attribute to the checked state. 
All you have to do is declare a global variable with a condition. For 
instance: <tal:block condition="exists:request/SiteCookie" 
tal:define="global return_visitor python:1" /> Then in the checkbox input 
type tag you would put: <input tal:attributes="checked return_visitor" 
type="radio" name="customer_type" value="return_cust"> and it will render 
<input type="radio" name="customer_type" value="return_customer" checked> if 
true. If there is no return_visitor it will not give you an error, it will 
just not render the checked state. Very handy indeed!

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