[英]How to render <p:graphicImage> conditionally depending on if the resource exists
How can I render a <p:graphicImage>
only if the resource URL is valid? 仅当资源URL有效时,如何才能呈现
<p:graphicImage>
?
<p:graphicImage url="#{resource['images/image.png']}" />
Basically, I would like to render my graphicImage only if #{resource['images/image.png']}
actually exists. 基本上,我只想在
#{resource['images/image.png']}
实际存在的情况下渲染我的graphicImage。 How can I validate this? 我该如何验证? I tried to follow this JavaScript example , but I didn't succeed.
我试着按照这个JavaScript示例 ,但我没有成功。
Check if ResourceHandler#createResource()
doesn't return null
. 检查
ResourceHandler#createResource()
是否不返回null
。
<p:graphicImage name="images/image.png" rendered="#{not empty facesContext.application.resourceHandler.createResource('images/image.png')}"/>
Note that I replaced url="#{resource['resourceName']}"
by a much simpler name="resourceName"
. 请注意,我用更简单的
name="resourceName"
替换了url="#{resource['resourceName']}"
name="resourceName"
。
I don't use url, rather combination of name and library... 我不使用url,而是使用名称和库的组合......
This works for me .... Hope it helps 这对我有用......希望它有所帮助
<h:dataTable id="image" value="#bb.getCurrentBorrowerImage(history.borrower_id)}" var="i" >
<h:column rowHeader="">
<h:graphicImage name="#{i.imageFileName}" library="borrower_images" alt="Item Image" height="100" width="100" rendered="#{!empty i.imageFileName}"/>
</h:column>
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