You can specify a decorator for each supported media
type in the properties file or, as is more common,
using the setProperty tag. Follow this link for an
example:
http://displaytag.homeip.net/displaytag-examples-1.1/example-new-export.jsp
<display:table name="test" class="simple nocol"
export="true"
decorator="org.displaytag.sample.decorators.HtmlTotalWrapper">
<display:setProperty name="export.pdf.decorator"
value="org.displaytag.sample.decorators.ItextTotalWrapper"
/>
<display:setProperty name="export.rtf.decorator"
value="org.displaytag.sample.decorators.ItextTotalWrapper"
/>
<display:setProperty name="export.excel.decorator"
value="org.displaytag.sample.decorators.HssfTotalWrapper"
/>
The decorator configured in the table tag property is
meant to be the HTML decorator.
Different decorators for each media type are required
because
how each media content is written and the final
destination differ with each media type, html written
to a text stream, hssf client writing to a binary
stream, itext client writing to a binary stream.
-Jorge
--- "SourceForge.net" <[EMAIL PROTECTED]> wrote:
>
> Read and respond to this message at:
>
https://sourceforge.net/forum/message.php?msg_id=3578601
> By: andrewfannin
>
> Export and TableDecorator
> I'm not sure if this is an issue or a setting I'm
> missing somewhere ... any
> insight would be appreciated.
>
> displaytag 1.1 :
> During an excel table export, I have received
> java.lang.NoSuchMethodException:
> Unknown property 'viewUserId', thrown from
> PropertyUtils. getProperty() which
> is being used by the report generator class () .
>
> The problem is that the TableDecorator for this
> particular table is not being
> used to access the property values, thus, as in this
> case, an exeception is
> thrown because the property 'viewUserId' does not
> exist on the naked row object.
>
> Doing a little investigation into where the
> TableDecorator is set leads one to
>
> TableTag.doEndTag():
>
>
>
> // TableDecorator tableDecorator
> =
>
DecoratorFactory.loadTableDecorator(this.decoratorName);
> String tableDecoratorName = null;
> Object previousMediaType
> =
> this.pageContext.getAttribute(PAGE_ATTRIBUTE_MEDIA);
> if
> (MediaTypeEnum.HTML.equals(this.currentMediaType)
> && (previousMediaType == null
> || MediaTypeEnum.HTML.equals(previousMediaType)))
> {
> tableDecoratorName = this.decoratorName;
> }
> else if
> (!MediaTypeEnum.HTML.equals(this.currentMediaType))
> {
> tableDecoratorName
> =
>
this.properties.getExportDecoratorName(this.currentMediaType);
> }
> TableDecorator tableDecorator
> =
>
this.properties.getDecoratorFactoryInstance().loadTableDecorator(
> this.pageContext,
> tableDecoratorName);
>
> if (tableDecorator != null)
> {
> tableDecorator.init(this.pageContext,
> this.list, this.tableModel);
>
> this.tableModel.setTableDecorator(tableDecorator);
> }
>
>
> You can see here that if the "currentMediaType" is
> HTML (and the "previousMediaType"
> is null or HTML)*,
> then use the "tableDecoratorName" specified by the
> tag attribute(decorator="")
> in the JSP.
>
> The proper TableDecorator is returned and everything
> works as expected.
>
> If the "currentMediaType" is Not HTML, for example
> "excel" or "pdf", then you
> can see the "tableDecoratorName" is pulled from,
> ultimately the displaytag.properties
> file.
>
> The key getExportDecoratorName(String mediaType)
> uses,
> ends up being
>
> export."mediaType".decorator , or in this example
> export.excel.decorator
>
> or null if this property doesn't exist (as it does
> not by default).
>
> This is where I have become confused about the
> programmers intentions.
> If, for example, I set the property
>
>
export.excel.decorator=com.myco.decorators.UserTableDecorator
>
> all tables attempting to exported in excel would use
> the same UserTableDecorator,
> would they not?
> Which only works if UserTableDecorator is the only
> Decorator.
>
> What is export.excel.decorator used for?
>
> If it's used as a runtime replacement for the
> TableDecorator, obviously it needs
> to be by table.
>
> I would prefer to use the <displaytag:column
> media="" attribute to define export
> tables and have it pick up the same TableDecorator
> used to generate the HTML
> view; allowing me to just add new virtual properties
> to the same TableDecorator.
>
> Any insight would be helpful to where to go with
> this (i.e. workaround
> vs. patch)
>
> Thanks
> andrew
>
>
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