CODEWITHSUNDEEP
javajsf
Cristian Boariu
Cristian Boariu

Reputation: 9621

strange jsf issue

I have a facelet component for displaying rss content:

rssFeedReader.xhtml

<h:outputText
    binding="#{rssReaderBean.text}"
    value="#{url}">
    <f:attribute
        name="url"
        value="#{url}" />
</h:outputText>

<ui:repeat
    value="#{rssReaderBean.rss}"
    var="rss">
    <ice:panelGroup>
        <ice:outputLabel
            value="#{rss['publishDate']} - "
            rendered="#{not empty rss['publishDate']}">
        </ice:outputLabel>
        <a
            href="#{rss['link']}"
            target="_blank">#{rss['title']}</a>
    </ice:panelGroup>
    <ice:panelGroup>
        <ice:outputLabel>#{rss['description']}</ice:outputLabel>
    </ice:panelGroup>
    <hr />
</ui:repeat>

and I include it where I need it like:

<myLib:rssFeedReader url="http://rss.news.yahoo.com/rss/topstories"></myLib:rssFeedReader >

If I include it with different urls, multiple times on my page, I do not understand why it displays multiple times the same FIRST url rss feed insted of taking each url separately.

To be able to read the specified url in my bean I bind it to the h:outputText from my facelet. Code from RssReaderBean bean:

private HtmlOutputText text;
public HtmlOutputText getText() {
    return text;
}

public void setText(final HtmlOutputText text) {
    this.text = text;
}

and the method which takes the url and returns the list:

public List<Rss> getRss() {
        try {
            final URL u = new URL((String) text.getAttributes().get("url"));
///read the rss feed and prepare the result, this code works good so its not required here
}

Can you see the problem...?

Thanks.

UPDATE: The bean has Request scope specified in faces-config.xml. If I print out the value of the text url it shows the LATEST url but all the content is taken from FIRST...

so basically for:

<gra:rssFeedReader url="http://blog.test.com/feed/rss/"></gra:rssFeedReader>
                    <gra:rssFeedReader url="http://rss.news.yahoo.com/rss/topstories"></gra:rssFeedReader>

it prints out the content of blog.test.com but text value when the page is rendered will show empty for first and yahoo url from second one...

Upvotes: 0

Views: 108

Answers (1)

BalusC
BalusC

Reputation: 1109695

The problem is caused because you're binding the <h:outputText> of the tag file to a single bean property. So, everytime you add another <myLib:rssFeedReader> tag, it will override the binding with the last added tag in the view. Finally, when #{rssReaderBean.rss} is been evaluated during rendering the view, it has only the last one at it hands.

There are several ways to solve this. The cleanest way is to create a fullworthy custom UIComponent wherein you specify the URL as an attribtue. The attribute is supposed to be specific to the component, not to a single bean property. An alternative is to use a Map<String, HtmlOutputText> property instead, this is however going to be clumsy.

Or if you're running a Servlet 3.0 / EL 2.2 capable container or replace the standard EL implementation by one which accepts method arguments, such as JBoss EL, then you could pass the URL as argument instead. E.g. #{rssReaderBean.rss(url)}. For installation/configuration detail, see this answer.

Upvotes: 2

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