Tapestry 5: Building Web Applications

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Alexander Kolesnikov

"Tapestry 5: Building Web Applications"

gif}" align="absmiddle"/>
t:encoder="localeEncoder"
onchange="this.form.submit()"/>

Creating Custom Components
[ 226 ]
As for the Select component, almost everything should be familiar to you. One new
addition is the use of the onchange attribute and a tiny bit of JavaScript for its value.
This will ensure that whenever a new option is selected in the resulting drop-down
list, the form surrounding the component will get submitted automatically (in this
case initiating the change of the application's locale).
But if you look closely at how the image is obtained to display a flag, you will notice
something different. This is how the image is provided now:
${asset:images/flag.gif}
And here is how a similar image was obtained in the previous chapter:
${asset:context:/assets/flag.gif}
The main difference is the context: bit. When the context is mentioned while
providing an asset, Tapestry will be looking for that asset relative to the context of
the web application. This means that if the application is deployed on some server,
and its URL is www.someserver.com/celebrities, then anything that goes after
this URL will be the path relative to the application's context.

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Foundation Flex for Designers (page 87) Systems Engineering with SysML/UML: Modeling, Analysis, Design (page 883) Administering Windows Server 2008 Server Core (page 104)

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Alexander Kolesnikov

"Tapestry 5: Building Web Applications"