Using f:param inside o:graphicImage

Question

The following used to work with p:graphicImage but not with o:graphicImage.

Problem: data_id is always null.

xhtml:

<p:dataScroller var="data"...
  <p:graphicImage  value="#{bean.imagel}" >
      <f:param name="data_id" value="#{data._id}" />
  </p:graphicImage>

Bean:

public InputStream getImage(){

    String dataId = FacesContext.getCurrentInstance()
            .getExternalContext()
            .getRequestParameterMap()
            .get("data_id");

I also tried with o:param with the same result. What am I missing?

score 3 · Accepted Answer · edited May 23 '17 at 11:44

3

The <f:param> inside <p:graphicImage> is a PrimeFaces-specific trick to get the StreamedContent thing to work "as expected".

The <o:graphicImage> doesn't support it (neither does standard <h:graphicImage>). Just pass it as EL method argument the usual way. It ends up in more clean code.

<o:graphicImage value="#{bean.getImage(data.id)}" />

public InputStream getImage(Long dataId) {
    // ...
}

See also code examples in documentation.

edited May 23 '17 at 11:44

Community

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answered Jan 19 '16 at 12:55

BalusC

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Thanks, by the way, I think it should be `value="#{bean.getImage(data.id)}"` instead of `bean.image` ? – sinclair Jan 19 '16 at 13:30
Indeed, copypaste mistake, sorry! – BalusC Jan 19 '16 at 13:43

Using f:param inside o:graphicImage

1 Answers1