CODEWITHSUNDEEP
jsfprimefacesomnifaces
imnotthatrobot
imnotthatrobot

Reputation: 147

EL: cannot access property method

I have my database whit a BLOB field named 'avatar' in which I store the user's photo. This field is represented in my JPA entity as a byte[]. I want to render the 'avatar' element only if the array has a positive length, but i get the next exception from javax.servlet.FilterChain.doFilter() :

"Exception: Method length not found"

This is the code:

<o:graphicImage id="avatar" 
                value="#{loginView.user.avatar}" 
                dataURI="true"
                rendered="#{loginView.user.avatar.length()>0}"
 />

If I check the length from the backing bean, returning a Boolean to the EL, it works and renders the image, but I need to preserve the backing code unaltered, that's why I need to do the checking from my xhtml. Thanks.

edit: rendered="#{not empty loginView.user.avatar}" is not working, that's why I had to move to another option.

Upvotes: 0

Views: 173

Answers (2)

Tomek
Tomek

Reputation: 512

Try using JSTL. Taglib namespace:

xmlns:fn="http://java.sun.com/jsp/jstl/functions"

Usage:

<o:graphicImage id="avatar" 
            value="#{loginView.user.avatar}" 
            dataURI="true"
            rendered="#{fn:length(loginView.user.avatar) > 0}"/>

Upvotes: 1

Krzysztof
Krzysztof

Reputation: 517

Length is not a method but property of array. Try to make a method inside loginView bean which will return something like this.

public boolean isAvatarLoaded() {
    return this.user.avatar.length > 0;
}

<o:graphicImage id="avatar" 
                value="#{loginView.user.avatar}" 
                dataURI="true"
                rendered="#{loginView.isAvatarLoaded()}"
 />

Upvotes: 0

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