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One possible way to provide the else parameter was shown
previously, let's have a look at it once again:


t:value="subscribe"
onclick="this.form.submit()"/>
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Here we have a ... element
surrounding an alternative markup, namely a Tapestry Checkbox component
disguised as an ordinary HTML control. Note that the value parameter of this
control has a value, subscribe, which is the same page property as the one that was
used for the test parameter of the surrounding If component.
The Checkbox component is also associated with a line of JavaScript that runs when
the check box is clicked on. This JavaScript simply submits the surrounding form:
onclick="this.form.submit()"
Simple Components
[ 114 ]
Let's see how all this works together. In the very beginning, when the Registration
page is rendered for the first time, the subscribe property will evaluate to false,
and so the check box that prompts the user to subscribe will be displayed (the
alternative content provided as the else parameter of the If component).


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