如果图像不存在，则隐藏graphicImage

Question

I have a graphicImage that takes its value from a servlet (called "picture" - it dynamically serves images stored on the server).

I would like to hide graphicImage when servlet returns null (no image was found). I tried using FacesContext.getCurrentInstance().getExternalContext().getResource() but it returns null even for correct URLs.

 <h:graphicImage value="/picture?name=#{myBean.name}" />

Answer 1

if i missunderstand you then sorry.

i would suggest two ways to hide this image:

1. you can check in any ControllerBean (myBean, or ...) if that image exists or not, and passing a rendered Property to JSF UI:

   <h:graphicImage value="/picture?name=#{myBean.name}" rendered="pictureControler.isFound"/>

2. or just add alt="" to that image, this image woun't be displayed then.

   <h:graphicImage value="/picture?name=#{myBean.name}" alt=" "/>

NOTE: the last one not tested but i think should work.